_—s Digitized by the Internet Archive in 2009 with funding from Ontario Council of University Libraries http://www.archive.org/details/laboratoryappara1914arth LABORATORY APPARATUS AND REAGENTS SELECTED FOR LABORATORIES OF CHEMISTRY AND BIOLOGY IN THEIR APPLICATION TO EDUCATION, THE INDUSTRIES, MEDICINE AND THE PUBLIC HEALTH INCLUDING SOME EQUIPMENT FOR METALLURGY, MINERALOGY, THE TESTING OF MATERIALS, AND OPTICAL PROJECTION EDITION OF 1914 COPYRIGHT, 1914, BY THE ARTHUR H. THOMAS COMPANY A Pn Ee THOMAS COMPANY WEST WASHINGTON SQUARE (280 SOUTH SEVENTH ST.) PHILADELPHIA BROAD ST. | Lab (=i) es OLp| | | EJLOCATION Lior st (i — OUR LOCATION WASHINGTON SQUARE Washington Square Front of Building How to Find Us In December, 1912, we moved to the Farm Journal Building, a new concrete, fire-proof structure located on West Washington Square (230-24 South Seventh Street), a neighborhood which has become the publishing centre of Philadelphia. The fourth and fifth floors of the building and a portion of the basement were designed and built with special reference to the requirements of our business. The increase of our total floor space to 40,000 sq. ft. (two and one-half times that occupied by us at Twelfth and Walnut Sts.) has distinctly increased the general efficiency of our service. Of the above mentioned space approximately 8400 sq. ft. is devoted to salesroom and offices. In this sales- room we maintain a permanent exhibit of over 6,000 different pieces of Laboratory Apparatus, all conveniently arranged for inspection and handling by our visitors. A dark room is provided for the demonstration of Projection and Photo-Micrographic Apparatus. Our office space is well lighted and ventilated and contributes to the comfort and welfare of our employees as well as to the thoroughness of their work. Some interior views of our establishment are to be found on various pages throughout the catalogue Washington Square Side of Showroom Looking North > ee) 4 = iS ve) ae ie Ht SOeweM. A Ss CGeOr OM SR aeA, IN < PREFACE. We believe that the principles underlying the organization and daily conduct of our business are understood and generally endorsed by those familiar with them. The following discussion is, therefore, offered chiefly for the information of those hitherto without experience in dealing with us. PRICES—The prices throughout this catalogue are subject to change without notice. This is largely because the goods listed originate in over twelve hundred factories and in many instances we have no control over either the cost or the selling price. Certain discounts are allowed from our list prices to Institu- tions, State, City and U. S. Government Departments, Industrial Concerns and other organized establishments, conducting regular laboratory work, because of their aggregate annual purchasing power. These discounts are not allowed on occasional purchases of a few items only by those not regularly connected with laboratory work. Our discount sheet will be published at frequent intervals and important changes in both list price and discount noted therein. Prices on items not regularly carried in stock and designated ‘‘Duty Free’ and ‘‘Duty Paid” are subject to more variation than regular stock prices because they are directly dependent upon the size of the individual order. (See also paragraph ‘‘Duty Free Importation’ below.) They are printed for the guidance of customers in ascertaining the cost of individual items apart from large importation orders and in most instances the prices given apply to the importation of a single item of the article listed. BREAKAGE AND SHORTAGE—We make no claim as to our infallibility and, while our goods are checked and packed by experienced employees under rigid control, breakages and shortages occasionally occur because of defective packing or of our mistakes. When such claims are clearly and promptly pre- sented to us it is our custom to adjust them without undue argument as we desire to subordinate literal terms of contract to an underlying spirit of fairness and to maintain our interest in each transaction until our customer receives full satisfaction and value, no matter where or when our technical respon- sibility may end. We further assist in presenting established claims against the transportation companies from which we hold receipts for shipments. Customers will greatly facilitate the adjustment of such claims by refusing to receipt for goods received in damaged condition, until they have been examined and ccndition noted by the local freight or express agent. STOCK—Unless otherwise designated the goods in this catalogue are mostly in stock for immediate delivery. A few domestic items of great weight or bulk are not always on hand but prompt factory delivery is usually possible. In addition, there are certain articles of Huropean origin listed with both duty free and duty paid prices. Such designation indicates that they are not regularly carried in stock, usually because the demand for them is confined to institutions entitled to duty free importation. Where the word ‘Stock’? is used the article is regularly carried in stock and the duty free price printed for the convenience of those entitled to it. DUTY FREE IMPORTATION SERVICE—Under Paragraphs 573 and 654 of the Tariff Act of 1913 apparatus of foreign origin may be imported for Educational Institutions free of U. S. Customs duties under certain regulations established by the U. S. Treasury Department. The conduct of such importations is a special feature of our business and we believe our service in the carrying out of the many techni- calities required is a great convenience to our customers. Duty free importations through our medium are usually handled at less expense, frequently at some saving in time and always with much less trouble, than when orders are placed directly. Duty Free prices f.o.b. Philadelphia on general lists of apparatus can not be printed either in our catalogue or on our discount sheet as ocean freights on such goods are mostly paid by the cubic meter and the delivered rate per unit of foreign currency depends, therefore, directly upon the relation between the bulk and value of any given shipment. All duty free quotations are made subject to the rulings of the Collector of the Port at which entry is made and the prevailing regulations established by the U. S. Treasury Department, and we do not guarantee duty free entry under any circumstances. Under the present ruling of the U. 8S. Treasury Department, which has been supported in the U. S. Courts. Hospitals, even when training schools for nurses are connected there- with, may not import free of duty. RETURN OF GOODS—Customers are requested not to return goods for any reason until after communication is had with us. When the return is arranged suitable tags are sent which when attached to the articles in question insure prompt credit, repair or exchange, as indicated. The time involved in such pre- liminary arrangement is insignificant compared with the time and labor required to establish the iden- tity and disposal of goods sent us without such precaution. SHIPMENTS—Where no instructions are furnished with order we exercise our own judgment as to method of shipment, i.e., via rail, boat, parcel post, etc. Allshipments are made in accordance with the regulations of the Interstate Commerce Commission and insurance only effected when specific directions are given, except in parcel post shipments which are automatically insured against both loss and breakage under a blanket policy, the small charge for such insurance being included on bills. Our business is confined to the buying and selling of Apparatus and Reagents, mostly within the limits mentioned on the title page of this catalogue. We are not scientists, inventors or manufacturers and we are not equipped to design and experimentally develop scientific apparatus. We believe such work is properly done by the scientist in his laboratory, the manufacturer in his shop, or by the two in cooperation and that the function of the dealer advantageously begins only after such work is completed. We are ready whenever possible to facilitate cooperation between the scientist with ideas for development and selected manufacturers with facili- ties applying thereto. We own no patents, have part in no monopolies and all of the merchandise offered herein is obtainable either directly from the makers or through other dealers whenever our services fail in their operation toward the convenience, economy and general satisfaction of the purchaser. A preface applying specifically to our business in Reagents is printed with the Reagent section of this Catalogue. ARTHUR H. THOMAS COMPANY. III H (0) “MiaAYs G_ © ..M > RRRAREN ey > vs) | ao iS ve) ac 4 Bausch & Lomb Optical Company Works BAUSCH & LOMB OPTICAL COMPANY—Under an arrangement in successful operation for the past fourteen years, we carry in stock in Philadelphia a complete line of Microscopes, Microtomes, Projection and Photo-Micrographic Apparatus as manufactured by the Bausch & Lomb Optical Company, of Rochester, N.Y. We distribute these products in Pennsylvania, New Jersey and the Southern states, at original factory prices, thereby saving customers in this territory both time and transportation expense. While nearly all of these goods are listed in this catalogue, we have for free distribution the following original Bausch and Lomb catalogues in editions specially prepared for us. Microscopes and Accessories Photo-Micrographic Apparatus Microtomes Projection Apparatus o atta rl a qi a in i ttn iu 1 Le ti ar ne is tt Carl Zeiss Works CARL ZEISS, JENA—Since 1899 we have been direct importers of all Zeiss products as applied to laboratory work. We carry in duty paid stock for immediate delivery a large assortment of Microscopes and Accessories, Refractometers, Haemacytometers, etc., at factory prices plus duty and transportation. All duty free importations of Zeiss products are handled by us at the minimum rate of 25¢ per Mark, f.o.b. Philadelphia. The catalogues, pamphlets and reprints of scientific articles published by the firm of Carl Zeiss constitute a distinct addition to scientific literature. We carry a complete assort- ment of these publications on hand for immediate distribution free of charge toscientistsin the United States and publish from time to time a complete list thereof. We mention some of the more important catalogues and pamphlets as follows: Mikro 184. Microscopes and Accessories. Mikro 243. Epidiascope fer the Projection of Mikro 227-231. Ultra-Microscopy and Dark- Opaque Objects, Microscopic Objects and ground Illumination Apparatus. Lantern Slides. Mikro 264. Photo-Micrographic Apparatus. Mess. 160. Optical Measuring Instruments. Mikro 239. Large Projection Apparatus. Mess. 165. Dipping Refractometer. Mikro 170 and 234. Photo-Micrographic Outfit Mess. 172. Abbe Refractometer. for Ultra-Violet Light and Supplement to Mess. 173. Butter Refractometer. same. Mess. 188. Pulfrich Refractometer. RG Ste Ei BU). aR rie i hsomeM A =S CAEOr oMe mbes a INU Ly. > IMPORTATION SERVICE FROM SPECIFIED EUROPEAN MAKERS An important feature of our business is the importation service from specified European manufacturers of scientific instruments whose catalogues we supply to intending purchasers and whose goods we furnish at net factory prices plus our actual cost of importation, which is ia most instances distinctly less than when orders are placed directly. This service is for obvious reasons much wider in its scope than is our business as described on the title page of this catalogue and we maintain a reference file containing catalogues from over seven hun- dred European manufacturers. Our profit on importation orders from specified makers is confined to the dis- count allowed us by the maker and in no case do we advance the factory prices except by the addition of U.S. Customs duty in duty paid importations, and in all importations by the addition of transportation charges. We mention below a few European makers of reputation whose catalogues are regularly supplied us for distri- bution. Eugen Albrecht, Physiological Apparatus after Hiirthle, etc. Montaudon, Auzoux Models of Human and Comparative Anatomy. R. Brendel, Botanical and Zoological Models. Cambridge Scientific Instrument Co., Electrical Measuring Instruments, Duddell Oscillograph, Hin- thoven Galvanometers, Electro-Cardiographic Apparatus, etc. Deyrolle et Fils, Models of Human and Comparative Anatomy, and other Anatomical Preparations. Dr. Th. Edelmann, Electrical Measuring Instruments, Einthoven Galvanometers, Electro-Cardiographic Apparatus. Ferdinand Ernecke, General Physical Apparatus. R. Fuess, Petrographical Microscopes, Goniometers, Refractometers, Meteorological Apparatus, Pre- cision Thermometers, etc. Robert Goetze, Apparatus for Physical Chemistry and Precision Thermometers. Greiner & Friedrichs, Fine graduated and lamp-blown Chemical Glassware. Dr. G. Griibler & Co., Stains for Biological Work. Emil Gundelach, Fine Chemical Glassware, Vacuum Tubes, etc. Hartmann & Braun, Electrical Measuring Instruments. Chas. Hearson & Co., Ltd., Bacteriological Incubators and Paraffine Baths. Adam Hilger, Ltd., Wavelength Spectrometers and Spectrographs, Refractometers, Interferometers Goniometers, Spectrophotometers and Diffraction Gratings. R. Jung, Physiological Apparatus, Microtomes, etc. C. A. F. Kahlbaum, High Grade Chemicals and Reagents. Max Kohl, Physical Apparatus. Comprehensive catalogue of S82 pp. Fritz Kohler, Apparatus for Physical, Electro- and Photo-Chemistry. Konigliche Porzellan-Manufaktur, Porcelain Ware for laboratory and manufacturing purposes. Dr. F. Krantz, Crystal Models and Mineralogical Preparations and Collections. A. Kriiss, Spectroscopes, Spectrometers, Spectrophotometers, Colorimeters, etc. F. & M. Lautenschlaeger, Bacteriological and General Laboratory Apparatus. A large general cata- logue of 743 pages. E. Leybold’s Nach., Physical Apparatus, Gaede Vacuum Pump, Gaede Molecular Pump, ete. C. F. Palmer & Co., Physiological Apparatus. Ph. Pellin, Polariscopes, Colorimeters, Spectroscopes, Le Chatelier Metallurgical Microscope, ete. Wilh. Petzold, Physiological Apparatus. Pulsometer Engineering Co., Geryk Vacuum Pump. W. G. Pye & Co., Physical Apparatus. Carl Reichert, Polariscopes, Metallurgical Microscopes, etc. Max Rinck, Physiological Apparatus. Alb. Rueprecht & Sohn, Analytical Balances and Weights. Gebr. Ruhstrat, Laboratory Resistances. F. Sartorius, Analytical Balances, Microtomes, ete. Schmidt & Haensch, Spectroscopes, Spectrometers, Polariscopes, Photometers, Spectrophotometers, Colorimeters, ete. Schott & Gen., Jena Laboratory Glassware. Dr. Siebert & Kuhn, Fine Thermometers. Société Génevoise, Optical Measuring Instruments, Dividing Engines, Physical Apparatus. Spindler & Hoyer, Apparatus for Physiology and Psychology. Radio-Chemistry. etc. Steeg & Reuter, Mineral Preparations. Tramond, Models of Human and Comparative Anatomy, Osteological Preparations. Otto Wolff, Electrical Measuring Instruments, Designs of the Physikalisch-Technische Reichsanstalt. Carl Zeiss, Microscopes and Optical Measuring Instruments (See Special Announcement page IV). E. Zimmerman, Apparatus for Physiology and Psychology. > Dn 4 = U R teee.. Ov gMeeAgesS EG -O: M. “Po gAaeNe oy A very complete index is to be found on page 558 of the catalogue. The arrangement of this catalogue is based upon convenience rather than consistency. plans lead if completely carried out to inconvenient location of certain articles. All systematic The general arrangement is alphabetical but in a number of instances the group system has been followed as a more convenient arrrangement. Asphalt and Tar Testing............. Bacteriological Apparatus. .....-....- Cement Testing oso. ae. coon ewes Charishs ose cote eo ae Scot Crushing, Grinding and Pulverizing Dissecting Instruments...........--. Electre-Ghemistry -... 5.205... =<=-<- GaslAnalysighe® Soe g.o sen se eee Hizematology? a2 28 oe 5. ooo cee neck Measuring Appliances............... Microscopes and Accessories ..._.... Microtomes and Accessories......... Milk Testing-- >. 2 eee ee ee ae ee 161 Physical Chemistry. 5:2... ¢-22 coos ee eee Sa aes 181 Physiological and Clinical Apparatus ....__...... 398 ee 195 Plant Physielogy.<- 2-0 33 29 Gen. eee Sacto somes 245 Polariscopes and Accessories .................... 424 eee Ne 262 Projection Apparatus. .- 2...) 5. 5-225...<34 = eee Sava PaimaGiion 290 Radio-Chemistry =... ...... 0.2.5.0. 0000+ 2+. eee AES egaSae 304 Spectroscopes and Accessories................... 492 Peer 343 Testing of Materials... ...=0-. 33 .. & = eee Rheostats, for Projection Apparatus. os “ Iaborai Rings, Concentric. ...........-- <\) ¢for supports.) occ Rubber Bulbs Ruless-s eee Sand Baths Scoops . 481 i . 482 Sleves) 2.5.2. 2 . 486 Silica Tubing . £8 Slides, 3 . 34 Slide Rules . 489 Sodium Press . BS Spatulas... . 490 Speci . 276 Spectrographs = a6 Stopwaiches... Storage Batteries. Testing of Materials, Apparatus for (Paper, Leather, Yarn, Textile) Test Tubes (8: 25.222 so eee «Supports: 22 Thermometers.......- [here xeeulaas Tongs... Urine Analvsis Apparatus Soenee Vacuum Distilling Apparatus .. « Vials... Wash Bottles. .........2.2..-5 Watch Glasses:.. 3°32 Water Baths._ Water Sills’ Ste. ssscee-eaoneeee “ “ « “« 20000. 20004. 20008. 20012. 20016. 20020. 20024. 20028. 20032. 20036. ~ a — No. 20036 No. 20032 No. 20028 No. 20024 Absorption Blocks, of paper purified with acids and used in calorimetric determinations to absorb diffi- cult combustible liquids. Height mm sere eiacs. le io seas aeelan Sielue testers a. Se cine Sale WRI pepe 15 13 16 DT SMECET RIMM eee Eos cere eae hic oe ie renee ee nae eo eee 7 10 14 PertlOUHMety sees csrc conic iain Ses ge Se os as erste gates creel eet eerste 1.10 1.10 1.10 Acetometer, Otto. For determining the percentage of acetic acid in vinegar, on wooden base.. ares Acid Basins, of porcelain. IDR GGT Nb er APR ee a Re Ee Can Enos SHOR GACH ECO Arc COC RAT AOn SES T 115 130 155 | DENY TR ee POR OSSED ce COCL nO OOr onaee orn oe amar ono aaaryarGaesar 1.10 1.25 1.50 Acid Pitchers, of stoneware. Capacity ececnc sac: se ceses cee Bee OC Dane ECO OROE 1000 2000 4000 8000 LOE TE Reto o ome REO IG CN EITC SO MOTI OTce SRST eet ence eee -30 -35 .60 1.00 Acid Pump, for drawing acids, ammonia, etc., from carboys and large containers. A foot power blower or other form of blast apparatus is necessary for use in connection with it.............. 5.00 Acid Pump, with force pump attached. Suitable for bottles and carboys with inside diameter of mouth (bai oF ar tel Gs B Bae Sane a sae o Ot nen S ae de CeO ROO ROCESS Ono onre cero or coc UnGaneEsacscss 5.00 Adapters, curved; light wall, lamp blown; for connecting retorts with receivers. LIST Yq H TEM ca) 1 epee rr any ince ek a Oe Reopen as on a Se TEE PERS 130 150 200 Diameter at largelend smmt sss 0+ A6 senate aa sSas ec enn soni sete w= - 22 30 40 LEC] ete ACS Sr. aestnes Sees evs oR Oh) OA ein ae Se ee -20 -30 -35 Adapters, straight; light wall, lamp blown. Ben pth WMO te aay. etre eae eres ole even e eS sta diaistel «sie afosie sae 130 150 200 Diametentatiwarrejend smite see ree epee, eres acnitefatn > oslore ee eer 22 30 40 BSA CUS ys ccd be yale oa OTT Ta eens Se aE EEE oS OE -20 -30 -35 Air Pump, Vacuum and Pressure, of brass, nickel plated. Mounted on oak base, with chamber 16 inches long by 2} inches in diameter. With two valves and two nipples for inlet and gutlet of ETE Moshe Cone ORE Oo 0 Shae ABN ee Se eo ee ee eee OEE onset Hemnin oS do.52 Air Pump, “Geryk”’ No. 0, fast running type, with new patented improvements, with 13 inch cy linder by 5 inch stroke, with 7 inch plate and vacuum gauge; giving a vacuum to .3mm less than perfect vacuum as measured by the MacLeod Gauge. All the ordinary phenomena can be produced, such as the freezing of water by evaporation, and other school work. Duty Bree: 2. ee oso: 30.00 Duty Paid....... Sp eae .... 36.00 No. 20040 No. 20044 20040. Air Pump, ‘‘Geryk’’ Duplex No.1. With 2 inch cylinder by 5 inchstroke. Specially designed for the rapid production of high vacua. The vacuum obtained is comparable with that given by a Sprengel pump and is very much more rapid. Is suitable for exhausting incandescent lamps and Roentgen tubes. Dutyhree spe cite cee cece eee 97.65 Duty Paid)..2-3. eee 117.20 20044 Air Pump, “‘Geryk’’ Duplex; for power driving, fast running type, with new patented improvements. This pump is specially designed for the production of high vacua in incandescent lamp factories and is widely used for this purpose both in the U. S. and ‘Europe. Requires less power for operation than any other form of vacuum pump. Supplied with a special vacuum stopcock, fitted with screw plug for regulating admission of air, at extra cost as indicated. Diameter of cylinder, erie TE ee on Oe eee 2 25 3 34 Stroke inches ech os cce Sere ore l ale ceerateteoeee scorers tele EP 5 Dl |e ae Age! Duty reese sera steer einer coe erates ..-- 126.00 157.50 252.00 315.00 IDR ALAATIL 6 pan qoduoueos cosdoodnaddcosadebososnute nade 151.20 189.00 302.40 378.00 Extra for stopcock, Duty Bree i eee ck An, rT Oe 4.75 6.30 9.45 11.00 x Duty Raid ene Sik Biocees 5.70 7.60 11.35 13.25 20048. Air Pump, ‘‘Geryk,’’ fast running type, with new patented im- provements, will exhaust to within .3 mm on MacLeod Gauge. These pumps are used for a variety of purposes in both laboratory and manufacturing work and are, there- fore, listed without plates. Number Biche elesaiey isco pee eornat stag tole 1 2 3 Diameter of cy linder, inches... 2 2 23 Stroke, inches. . eS ANS SE 5 0 10 Duty Free....... ssodeeeadene ealeey) 47.25 66.15 Duty Paid... ~.:: SS eR tOtTe SO 56.70 79.40 Vacuum Plates, only. Diameter, inches.. : 8 9. Sea Duty Free... : 5 UD 11.35 11.35 Duty Paid... 9.45 13.60 13.60 4) E,LEYBOLO'S NACHFOLGER, COELN No. 20052 No. 20052 20052. Air Pump, Gaede High Vacuum. Consists of an iron chamber half filled with mereury in which a porcelain drum rotates. This pump will exhaust a 6 liter flask after it has been brought down to a vacuum of 10 mm by preliminary exhaust (by means of a filter pump or preferably with Gaede’s Rotary Pump No. 20056) to .004 mm in 5 minutes, to .0001 mm in 10 minutes and to .00001 mm in 15 minutes. See Gaede, Physikalische Zeitschrift, 1907, VIII, p. 852. Complete with new patented valve drum and glass connection, but without mercury. Duty Free... ; . 120.00 Duty Paid....... ; een eel GO OU jill! No. 20060 20056. Air Pump, Gaede Rotary. Particularly recommended for use as an auxiliary pump in creating the preliminary vacuum necessary with the Gaede High Vacuum Pump. This pump works dry by means of a valve placed eccentrically in a metallic case. This pump is equally suitable for the production of blast as well as vacuum and on this account has wide application in laboratory work. It will evacuate a 6 liter flask from 1 atmosphere to 3 mm in 1 minute, to .04 mm in 2 minutes, to .15 mm in 3 minutes, to .035 mm in 8 minutes, to .012 mm in 10 minutes and to .006 mm in 15 minutes. As a pressure pump it will give a pressure of 1 atmosphere above the pres- sure of the atmosphere in which it is operated. For hand driving. DUtysERe@r ts sco actcse .. 186.00 DutyfPardeeseccemce taco eet oO 20060. Air Pump, Gaede Rotary, with Electric Motor. Same as 20056 but mounted on base board with elec- tric motor of 3h. p. and starting rheostat. Motor arranged for continuous operation. Voltage must be specified in ordering. Current)... . Sc seu ae ee A eee tces SITECE Altern ating Dutyshreee eee eae By tae See Ae earners ERs outer rico 195.00 210.00 IDutye aids bi ; AC eres Beep roi te SiGe eee 260500) 280.00 No. 20064 20064. Air Pump, Combination Outfit, consisting of Gaede High Vacuum and Gaede Rotary Pumps, the latter mounted on same base with electric motor. By means of belt connection the pumps are op- erated simultaneously by the same motor Voltage must be specified in ordering. Motor sup- plied with this outfit is not intended for continuous operation. C@urrentiesse eee Se oe SE aT ee Mr ee Raa Direct Alternating Duty Ereeee eee ae ; i 300.00 330.00 — Duty Paid...._.. : . 400.00 440.00 No. 20068 No. 20068 20068. Air Pump, Gaede Molecular. A new high vacuum pump which removes all vapors as well as gases. Will exhaust a6 liter flask starting with a pressure of 10 mm and using the Gaede Ro- tary Pump as an auxiliary, to .0003 mm in 2 minutes, to .00001 mm in 3 minutes and to .000002 mm in 4 minutes. In other words, this pump will exhaust to the same degree of vacuum in 3 minutes that the Gaede High Vacuum Pump reachesin 15 minutes. The Molecular Pump is built on an entirely new plan, being without piston of any kind and the communication between the receiver and the primary vacuum through the grooves and channels of the pump is at no time closed. The movement of the rotor acts on the movement of the gas molecules in the grooves of the rotor or the casing and produces a region containing fewer molecules, i-e., a vacuum, at the suction nozzle of the pump. This pump requires an electric motor with a speed of 3000 r.p.m. anda pulley 135 mm in diameter to give the required speed, i. e., 8000 r.p.m. Pump only, without motor. Duty Free... SAMA Aon 198.00 Duty. Paid... ....0.....7o0 0 Sa 264.00 No. 20072 No. 20076 20072. Air Pump, Gaede Molecular with Electric Motor. Same as 20068 but with electric motor and starting rheostat mounted on same base with pump. Voltage must be specified in ordering. Current: Agee acces te MNP eeh: civiecyoidiels Bogus GAqkaqaoe ates Direct _ Alternating Dwtyzhre ete set a. an caer. Sie sae S BAPE SAS RAee sae sao es ae 300.00 330.00 VOTIVE Do coerce en PETG ot Bre eI EP ae are CREE Cer car Sd en gan 400.00 440.00 Note.—The Gaede Molecular Pump should alw ays be backed by another pump which will exhaust into the atmosphere in order to secure maximum effect. In practical work in the manufacture of Roentgen tubes the Gaede pump is frequently backed by such a pump as the McNeill Rotary, which is in turn backed by a piston pump such as the Geryk, such a series being very much more efficient and rapid when so arranged. 20076. MacLeod’s Vacuum Gauge for use with Gaede and other apparatus. Duty Free........ ae SRN SA CB ee ...24.00 Duty bad] eer AA ARS OOS 35.20 No. 20082 No. 20080 20080. Air Pump, Crowell Rotary Type O-D, will exhaust to a vacuum of from 29 to 30 inches of mercury and can be used either totally immersed in oil in the oil box or without the oil box as shown. The capacity of this pump is 2 cubic feet of free air per minute. The inlet and outlet tubes are tapped for 34-inch pipe size and about } h. p. is required for operation; weight with the oil box 50 lbs., without oil box 20 lbs. As used in many college laboratories and in the Nutrition Laboratory of the Carnegie Institution of Washington. Can be used for blast as well as suction. ( Yomplete SWAEHN Olu Ox nee seme Cane ree CM BCs ON NA Nab mates Red rnin IO Nae en Ae Ci Bi 45.00 20082. Air Pump, Crowell Rotary Type O- D, a as above, but without oil box.. 20084. 20088. 20090. 20092. No. 20092 Air Pump, MeNeill Rotary, for High Vacuum. When properly backed by a Note—Five gallons of the speci: al Oil should be pure hased with each Pump. No. 20084 No. 20088 Air Pump and Compressor, Crowell Rotary. Exhausts under ordinary conditions of atmosphere to a vacuum of 29 or 30 inches of mercury. Can be used for pressure or blast up to 25 lbs. to the square inch. There are no valves, springs, gears or unbalanced parts and the direction of rota- tion is not alternated when changed from use as a compressor toa vacuum pump. Very satisfac- tory for supplying suction throughout a laboratory for filtrations, ete., or air pressure for blast lamps. For illustration of receiver, see page 73. In ordering please state whether receiver is to be included x = = & 5 2.8 S Wasa ee : Zc ee Se ¢ =E2 a 12s |eex <. es EE ae : late 5 ae Epa : ae FI SE os afb 4 = oZRa S) | S Lan ihe o> 2 a eles = Bigs = AZ S$ =B8 Ss > Daze = p in 13x18 $40.00 $8.00 2-D 40 | 9.2 400 1 8x2 115 bes 14 x 22 60.00 8.00 3-D 100 17.0 300 2 12x4 250 ees 19x3 90.00 10.00 4-D 280 40.5 250 4 l4x4 425 lies 23 x 38 150.00 10.00 5-D 100 46.0 200 5 IS x6 580 2 Ss 26 x 44 170.00 18.00 6-D 600 69.4 200 63 18 x8 725 2 26 x 55 225.00 18.00 pump exhausting into the atmosphere produces a vacuum of .0003 mm and under favorable circumstances will do even better. This pump is widely used in the manufacture of tungsten and other electric lamps and, as it will not exhaust directly into the atmosphere, must be backed by a pump producing a vacuum of at least 1 mm of mercury. In lamp factories a Geryk pump is frequently used for this purpose. he McNeill pump is also used in the manufacture of Roentgen tubes, ete., as an auxiliary to the Gaede Molecular Pump, in which combination it must also be backed by a pump exhausting into the atmosphere Special Oil, per gallon.. one on reese en meee Air Pump Plates, on tripod base, with heavy plate glass top and two-way stopcock. Without bell jar. For Bell Jars suitable for use with these plates see No. 21920. Diameter, mm.... : Ris. 200 250 300 EW ed oocnabconnosoccuodsdGdaRS elo aiatesclevaistotatoreter-[eloierertersietiet Sazocd UANny) 12.00 15.00 6 ee dels OR Hbe ) JHeOn aM: “A eSeaG © MP UAGENG Y¥ dt AnTEo. No. 20116 No. 20104 No. 20108 No. 20112 ATT AnT.COn No. 20096 No. 20100 20096. Air Sampler for Taking Dust and Bacteria Samples of Air. This apparatus consists of a ,'5 h. p. motor, either alternating or direct current, driving a small valveless suction pump, which draws air at a constant rate from a receiver, the receiver being placed between the meter and the pump. to take up pulsations from the pump. The meter is of the Venturi type, calibrated empirically to read in “‘Air-minutes per three cubic feet,’’ or in cubic feet per minute or any unit desired. A special glass cone for holding the filtering medium is inserted in a rubber gasket in the metal cone shown at the top of the apparatus. The apparatus is nickel plated, compact, neat in appear- ance and very durable and reliable in operation. The cabinet is 9 inches wide, 8 inches deep and 13 inches high, total weight 25 lbs. As used by Baskerville and Winslow for investigations of the air in school-rooms in New York City. See Jeurnal of Industrial and Engineering Chemistry, DUAR Us SIS Ra eo ae OF ct 5 Re enc oa Herencn Prunes cleft ois etn Ciemnd on DOO lo Loy pwc Ovo rie 20100. Air Tester, Wolpert, for the determination of COs; complete with necessary reagents in eight bottles ial OAicNONe 5 AeA ame dn bocce Dee Re omen teat ; : Shay treet is 6.00 20104. Alkalimeter, Schroedter, without tube in flask............. Been Bee me sageo Woah) 20108. ce cs with AS a CNA RE eae NR Meee ee : er ee et E80 20112. a Geisslenayilthyerounds OImtsaraaee eee eee rent ce 2.00 20116. ss oh sf i So SMO W LOLA sion Seeehcd tnercepeyetescene eae Steerer 2.00 20118. Alundum Refractory Cement, for use in connection with muflles, cores and wherever Cement with high Hn WlOLSGOLe pl LSE cp peace ts oteeteye te tercuovatet foleresduarehe ausxeverent avers 1 5 10 25 50 TE CTD See Seer ee oer elsin chars tik icveyebalchterets 30 15 13 10 -08 20120. Alundum Tubes, These tubes are porous but can now be glazed gas-tight without sacrificing their iBoresinches! sss ee ene ne: z é 3 1 13 11 3 Wrallteincheseencerasserr= x 4 t t oat Te z Each, 12 inches long........ 2.00 2.00 2.00 2.00 2.10 2.20 2.40 Each, 18 inches long........ 3.25 3.25 3.25 3.25 3.40 3.50 3.90 Each, 24 inches long........ 4.50 4.50 4.50 4.50 4.70 4.95 5.40 Bore inchesscty. treme Meer oh 1g 2 3 4 5 6 NVC sbavelosceM ete el Rel Oh on a ee 4 3 3 2 3 3 Bach, t2snches longs see aes 2.60 2.80 3.60 4.40 5.20 6.00 Bach) 1Sinchesslong:..: ¢. 22 eees ss oe 4.25 4.55 5.85 7.15 8.45 9.75 Each, 24 inches long.................. 6.30 8.10 9.90 11.70 13.50 5.85 20124. | Ampoules, of Jena Fiolax Glass, which may be identified by a dark longitudinal stripe. These am- Special prices for large import orders, both duty free and duty paid, on application. (OEHoING Uhiyy Qesoancaoopaacocoocedeanooenecondcasaon 1 2 5 10 25 Ord OO ete ae rela ee ek oR eee 1.45 2.00 2.55 3.60 7.05 No. 20128 No. 20136-40 With Petri Dish With Petri Dish | i . — No. 20164 No. 20148 Fig. 1 No. 20148 Fig. 2 No. 20172 20128. Anaerobic Culture Apparatus, Kiister, consisting of a glass absorption capsule, 120 mm in diam- eter by 15 mm high, entirely closed over with the exception of a small hole in the top. Absorb- ent material such as pyrogallic acid, ete., is placed in the dish to a depth of about 5mm. The Petri dish containing the culture is then placed over the opening in an inverted position and sealed down with plasticine. When the usual 100 mm Petri dishes are used, about 150 ec of air must be absorbed by the acid. Two parts of sodium hydrosulphite or pyrogallie acid are dis- solved in 20 parts of distilled water and poured into the absorption capsule and, just before placing the Petri dish above the capsule, 20 ce. of al0% solution of potassium hydroxide is added. Absorption takes place very rapidly because of the large absorbing surface and may be hastened by slight shaking. See Centralblatt f. Bakt. Referate 57 Bd. No. 14-22, p. 269-271. Absorption capsulevonlyzs sii: iotie nics water tere Siar eteve «mete ors staat ATS SPS 1.25 20148. Anaerobic Culture Apparatus, McLeod, consisting of two parts, a porcelain capsule to contain the pyrogallic acid and caustic soda solutions and a special Petri dish which has its free margin turned inwards and upwards. The porcelain dish is a hollow chamber. It is bisected in the lower two-thirds of its depth by a vertical partition and there is a circular aperture in the center of its upper surface. Around the margin of the upper surface is a small groove which is filled with plasticine. In using the apparatus 5 ce to 7 ce of a 15% solution of pyrogallic acid is run into the compartment of the chamber marked A in Fig. 2. This can most easily be done with a large pipette, 5 ce to 7 ce of a 10% solution of caustic potash is then introduced into compart- ment B. The Petridish is then pressed down into the plasticine in the groove and the plasticine is pushed up against its outer margin to insure the proper sealing of the chamber. As soon as the access of fresh oxygen from without has thus been cut off, a mixture of the pyrogallic acid and caustic potash solutions is effected by tilting the porcelain dish so that the solutions run over the partition at the point Kin Fig. 2 and react with one another. The Petri dish is shown in Fig. 1 ready for use in contact with the plasticine. Any condensation water which may form is retained in the groove R. See Journal of Pathology and Bacteriology (British), Vol. 4, April 1918, p. 454. Complete with both porcelain dish and special Petri dish...............-- 1.25 20152. Porcelain ‘Capsule; only:..< 6): 0. ch cee once at pape se ones oe ben elo ane eae nee eee 1.00 20156. Special Petri Dish; only. 7.265 «2 5sco wetter sissies aoe eee CeO EEE 25 Note.—For Plasticine see No. 20144. 20160. Anaerobic Culture Apparatus, Novy, with removable top permitting the use of Petri dishes. For use by either gas or pyrogallate methods. The two sections have wide ground flanges which, with the rubber bands, form an air-tight connection when held in place by clamps. The lower section is 150 mm high by 140 mm in diameter. Glass parts only, with rubber band but without metal CIBMPS2 5 Efe hoo Ae wpsyor cette cisreuieis kre Sissayeie a avatole ore nero ee eT eae crore heel ae ee ea 4.50 20164. Anaerobic Culture Apparatus, Novy, same as No. 20160 but with clamps....................----- 5.00 20168. . 0. See 10.80 20240. Animal Holder, new model of wood. With adjustable metal fittings on the sides for fastening the legs. This apparatus is suitable for a great variety of work and is sufficiently adjustable to be used for either guinea pigs or ndoge: Complete. Duty Free..... Boones tat) Duty: Raids: 0.03.36 eee 30.00 20244. Animal Table, Brodie, with a top 51 x 18 inches, and 40 inches high. With cleats for the easy attaching of the holding cords. Near the center and flush with the top is a copper hot plate, 30x12 inches, heated by two electric lamps, each having its own independent switch. With two up- right rods working in slots. At the end is attached Dr. Brodie’s anaes- thetic bottle and air warmer (see No. 43048) with a bent tube projecting through the table to supply air to the animal. Table is complete with ani- mal holder, four control switches, main switch and plug. Voltage must be specified in ordering. Duty Free. 2.0 eee 70.00 Duty’ Paid!):2... 222-2 oe ») No. 20244 =) — aD No. 20260 No. 20248 20248. 20252. 20256. 20260. 20264. 20268. 20270. 20272. 20276. 20280. No. 20272 No. 20268 Annealing Cups, Denver Fire Clay Company’s make; of fine, white selected clay; silica fusions. largely used for NUM Dee seer ae 2 eh CERO spares, SE eats AEE EE 0 1 2 SIZE PIT C DES tec pope mete tec ccersk cats Meer ait, Ghote. Suc dyesevoree Sede us eee TOL e ae lease 13x 13 1ixii 13x14 Per dozen.. SO AE COI CRAIC ECT ETE Ons Go SA OO 1.00 1.00 1.00 Covers, per Ozer so pe Ee ok ay wo -25 25 Anvil, steel, with mirror polished face; 4} inches long awelghtglglbe eee. eee eee eee 1.00 ss «« square, mirror polishe dface. Size of face, inches........ 1 iS 2 DEX 6.3 5 See eae nine bier Gea REE eC O SIn EO CMe Ee Eo CADE CEnicoronn anne 65 1.00 1745) Anvil, with vise. A well made tool, very convenient in the laboratory. Widthrote awsinchestan ea aaracehl sien a tcc see 13 2 23 Wieloh tale eprer pte sais Pelee ie okt fat Cin ertiae eect ae ote tae siete ies 4a 94 DENCE) Tas chad Sretney th Rast CR PSEE een CCR eC RICIES A ee alae Tee io EN IE 75 1.50 3.00 Aprons, laboratory, acigiproot.liphtiand pliable...+-..2ssee oes es soe essen eee 1.00 Aquaria, oblong, of heavy, clear, white glass, without base. Capaerty-s alll ons es pores eee yesers eee esses seein ees oske ious ofads Isis oniiciais to dese oF 5 Kengthrinchestatesperestrccics os ectrcke asic tes cae parents ne eon teonin ee bir oese emetic eae ons 103 13 TG naa ia \olaXs)spinn hob or 66 Rec cach, sities Ee oe iene Semen aails bomen soc 64 8 VET pti Ch Es ar epee ee eee etetcrste te Ae elo are lea ie hia crece shea nrone aittaode a ales e aperereestenies 104 13 MCU spa rassetercsie 5 ee are eater eee ao aera sl oat = Sia /areyasee ote vaca Suave ss. Gia sucks & aia eceuerel alegeuthan stots 3.00 8.00 Aquaria, as above, with base, each.. . 5.50 11.00 Aquaria, rectangul ar, of plate glass set in n wrought i iron frame, with slate bottom. As furnished by us to the laboratories of the U. S. Bureau of Fisheries. Boxing charged extra at cost. Special sizes made to order; prices upon Lappbeation. Length, inches a Do oes 18 21 233 29 Width, inches. . Waders, LOE 12 133 17 Height #inchess-s52-21-4aden soe as 1G 123 133 16 DEY Le Sea etoeaeoo > Racin Aneene eres 6.00 8.00 9.60 16.00 Aquaria, high form, of heavy, clear, white glass; with ground rim and groove near top. extra except when or dered i in original factory packages as indicated below. 3 1 1 Capacity, gallons............ A 3 2 Height, inchesint he, ath ee 7 3¢ 7 8 10 Diameter; mches.--..-.47--e2) 0 ia 83 9 11 DEG oabmoseuness yeoe 2 eked) 90 1.25 cue 2.15 Number in original ¢ Caseneeeeee LS 16 12 5 3 Each, in original case....... -55 .80 1.12 il6 35 2.50 Aquaria, low form, of heavy clear, w white glass, with ground rim and groove near top. extra except when ordered in origin: al factory packages as indicated below. Capacity, gallons:-....-.56 4 1 2 3 4t Diameter, inches... iP ohaw 8 10 12 14 Height, inches. . 43 5 64 ile 83 Bach see Se Oo -85 25 1.75 2.50 Number in origin al case..... 18 12 6 4 2 Each, in original case. ...... -60 .75 ililP4 1.65 2025) 33 433 19 21 18 21 20.00 32.00 Boxing charged 8 12 14 12 14 16 6.00 8.00 2 1 5.40 8.00 Boxing charged 7 10 16 18 9: 104 4.50 8.00 2 1 4.00 8.00 AS Ry ae Ua H. ie i) (Ol My Ayes GO 2M Re Ava Nees Hil HH | xi!) No. 20276 TE se OIA OE No. 20304 No. 20316 No. 20320 20284. Arsenic Apparatus, Fresenius, for the detection of arsenic, without support....................- 1.00 20288. ‘© Tubes, of Bohemian glass Sind Goa ero etoeitaatt iad Gono tints ce ea Aa aor A B C ees Wa chis asap ene eerie essere nuudneosodnie ccusaguaconncot 04 -04 -04 -04 20292. Arsenic Tubes, Transparent Silica, 3 inches long by # inch outside diameter with bulb § inch diam- QUOT I soso aicierere erm usyel =e apehee Tole alee fol ele Leseysie) chore) oye oie al@cin\acecalal nr atece;e/e/coesetersi sie teieheleks ae Ce ee eee ae 20296. | Asbestos Aprons, made of pure asbestos, canvas lined, complete with strap and buckle fasteners. State size in ordering. A medium size is sent unless otherwise specified......................-.. 7.50 20300. | Asbestos Board, in mill size sheets, 42 x 4S inches. The board is carried in stock in the following thick- nesses for which approximate weights are given. Onsmall orders, particularly when shipped alone, necessary crating 1s charged extra at cost bee ause of the small value of the article itself. Thickness, inches. By is 3 1 i 1 3 i Weight, lbs...... 2 4 7 LO 13 US 35 Per lb.. ees eee LO) -10 -10 -10 .10 -10 .10 -10 20304. Asbestos Board, in | squares, for use under beakers, dishes, ete. ‘thickness sinchessseenrass circ eea MRE eae rie Bohol Se ae tc aH 6 ts Sizehiniches te cick eer wae nah PSE one ek? ae ee ere 4 ca Ds 6 JOYA EES anopatosk tb seco ecas dunaonto Rate ae deerers oatonocdbsosos hie -04 “05 -06 20308. “AsbestosiCement, ready for use. (Per/oi)lbicanw.....5.< +e eeen ee ee eee eee eee -50 20312. Asbestos Cord, with strong, hard-twisted strands; convenient in the laboratory for supporting retorts, crucibles, etc., in contact with fire or heat: sizes 7th to 3th inch diameter, in } lb. balls. Per [oy | RR Coe ean ccmonat oncod cel ate nano nak Ero nerentar ocd escom ad maccinoodoss: -50 20316. Asbestos Gloves, with four fingers and thumb, made of asbestos cloth, with either asbestos or leather gauntlet. ‘Per palr.c.8: hes cbscacniet Secichéces cov 0 kaeie ga ad ste retin nee eee Te oe eee 4.00 20320. Asbestos Mat, circular, 83 inches in diameter, so-called “stove mats,’’ with metal binding and ring for hanging up; very: convenientiin the laboratory. ...-.. sossss.ccs- eee sesso eee eee 15 20324. | Asbestos Mats, square, } inch thick, neatly bound with metal to prevent fraying at the edges. Wery con- venient for use on table top and under burners to prevent scorching of wood etc. Special sizes made to order. Size, inches.... 8x8} 11x11 9x4 15x15 10x16 12x15 4x2 24x30 Bach eee one 20 ee CO a SO -40 50 50 -50 1.20 20328. Asbestos Paper, of pure, white fiber, 36 inches wide. Cut any length. Per lb............. Soo0d0 On) 14 20332. 20336. 20340. 20344. 20348. 20352. 20356. 20360. 20364. 20368. 20372. 20376. No. 20336 No. 20368 No. 20372 Ne. 20348 ASPHALT AND TAR TESTING APPARATUS Penetrometer, Standard, New York Testing Laboratory Type, for measuring the depth of penetration of a standard needle into the material to be tested at 77° F. or 25° C. in 5 seconds of time under a 100 gram weight; with standard clock reading in 3 seconds and dial graduated to 7; mm. A set of adjustable weights is provided permitting the use of either 50 or 100 gram loads in addi- tion to the standard of 100 grams. See “The Modern Asphalt Pavement’’............ 60.00 Penetrometer, Miniature, exactly similar to the above but one-half the size and specially designed for engineers’ portable use in making comparative tests, without clock........ 25.00 Drying Oven, same as above, but of Russia iron ; nidooonbboncosbonas SRO p COE eae 25.00 Asphalt Flow Plate and Mold, consisting of 3 plates each with four corrugations or 2 plates each with six corrugations and one mold. Type of plate must be specified in ordering..... 5.00 temperatures, i. e., about 200° F., the Engler Viscosimeter is mostly used. See Oil Testing Apparatus. Adhesion Machine, Kirschbraun-Sargent, a double scale dynamometer graduated in grams up to 250 grams and in ounces up to 8 ounces. Two sample cups are provided, one for the standard sample and one for the unknown. As used in the Chicago Paving Laboratories........ ... 20.00 Briquette Mould for Asphalt... .. GHEE EE botaichs dost nndotctosindcctiat Sati pees 4.00 Cubical Brass Mould, with plate for melting point determination, } inch...................... 4.50 Bitumen’ Holders Draper modellmerre. cee. sh easete cee ere eee ... 3.00 Cementation and Ductility Machine, Kirschbraun, for determining the relative cementation values of asphalt cements. May also be used for ductility and elongation tests under various con- ditions of temperature and speed.........................eeeeeeee esse sossese coco: WINN Crucible, Royal Berlin Porcelain, of special shape, with large filtering surface, as used in the deter- mination of soluble bitumen. Height 24mm, width at top 45 mm, width at bottom 35mm... .50 No. 20384 20380. Ductility Machine, Smith, for hand power; made entirely of metal with box heavily plated and enamel painted, with right and left screws, slip nuts for carriage, etc., for tests up to 100 eminlength. The test is conducted at a standard speed of 5 cm per minute at a temperature of 77° F. 135.00 20384. Ductility Machine, Smith, as above but with directly connected, direct current electric motor.. 175.00 20388. Ductility Machine, Electric Motor Drive, Chew Patent, constructed entirely of metal. All exposed parts covered by water are made of brass or bronze. Warping and rusting are entirely prevented. The mech- anism is strong, simple, durable and easily operated. The operation is smooth, uniform and accurate and reduces the personal equation of the operator to a minimum. This machine is adapted to testing all types of bituminous material which can be cast in moulds. Tank—The tank or box in which the test specimens are immersed is made of iron heavily lined with white porcelain, which makes it possible to see at all times the finest thread to which the specimen may be pulled. It is of such width that three speci- mens may be tested simultaneously. ‘ Moulds—Moulds for test specimens are of bronze, all parts being accurately machined and fitted. They are of standard dimen- sion with a minimum cross section of one square centimeter. A set of three moulds is furnished with each machine. Ad- ditional sets may be procured if desired. Carriage—The carriage is triangular in shape, specially designed to allow the operator freedom of access to the platform and posts which carry the moulds. It is supported on two tracks, one of which is slotted for its entire length and serves ay a guide, thus insuring a perfect unidirectional pull free from chatter or vibration. The carriage is operated by a single heavy screw shaft placed close to the side of the box so as not to obstruct the manipulation of test specimens. The carriage may at any time be engaged or disengaged from the screw shaft by means of a small hand lever, which operates a two piece nut, even when the screw shaft is turning. ; Drive—The screw shaft is operated by heavy bronze gears connected direct to the motor at one end of the tank by a worm drive. Either D.C. or A.C. electric motor is furnished as desired. The former is controlled by a rheostat: the latter is of the variable speed type. The motor is substantially mounted so as to reduce the vibration to a minimum. : Speed Indicator—The speed at which the test specimen is pulled apart is accurately indicated in centimeters per minute by the Chew Speed Indicator which is attached to the operating sbaft of the motor. This is a simple and unique device which makes it possible to operate and regulate the machine without recourse to any other timing device. It constitutes a novel and particularly desirable addition to the older type of machine. Once adjusted it is always reliable and absolutely pre- vents the possibility of error due to unknown variations in flow of current during the test. Any such variation is at once detected by the speed indicator and may be instantly corrected by adjusting the rheostat Jever so that the speed indicator registers the exact speed desired. Operation—After the test specimen has been brought to the desired temperature and attached to posts on carriage and platform, the carriage is disengaged from the screw shaft. The motor is then started and its speed regulated until the speed indicator reg- isters exactly five centimeters per minute. The carriage is then engaged with the scre haft while in motion. At the con- clusion of the test the carriage is disengaged from the screw shaft and slid back to its original position. Full directions for making the ductility test are furnished with every machine. When placing order, be sure to state the type of current for which motor should be furnished. Price on application. 20382. Extractor, New York Testing Laboratory Type, for analysis of paving mixtures containing broken stone. The bituminous mixture should be warmed until it can be readily broken apart by hand, without fracturing any of the stony particles; 500 grams of the disintegrated mixture should be packed as tightly as possible in the wire basket and then covered with a disc of cotton or felt of } inch to 3 inch thickness; 175 to 200 ce of carbon disulphide, carbon tetrachloride, chloro- form or benzole is placed in the inside vessel in which the wire basket is suspended. Cool water should be circulated through the inverted cone condenser which is also the cover of the apparatus and not intended to fit tight. A 16 c¢. p. carbon filament incandescent lamp is the source of heat. A 500 gram sample of the mixture should extract clean with carbon disulphide in about 3 hours. From 200 to 300 grams of asphalt block or Topeka type mixture is a sufficiently large sample for that type of mixture. After extraction, the solvent and matter removed from the sample during the analysis should be burnt to recover any fine mineral particles which may have passed into the extract. These extractors are made entirely of metal. Each, complete, but without incan- descent lamp 30.00 16 Ay ak gig Et TW SR H. ly SHS eon IM VATS Ce Oe IMA MBs AEN AY: No. 20392 20396. Hydrometer, Sommer’s Patent, for determining the specific gravity of asphalt, graduated from 0.85 to 1.3° at 25° C., as recommended by the Committee of the American Society of Civil Engi- neers. Outfit with brass receptacle and fittings, with instructions for use................ 10.00 20400. Hydrometer, same as No. 20396 but graduated from 0.950 to 1.100 No. 20404 No. 20408 20404. Dulin Rotarex, Large Model with Universal Motor, for samples of 500 or 1000 grams. The advantage of using such a large sample will be readily apparent as it permits running samples which contain a large mineral aggregate as found in asphaltic, concrete or bitulithic pavements. It is also advan- tageous in securing a considerable amount of bitumen in the pavement which can be used for the penetration test. The machine is directly mounted on top of a universal vertical motor which is entirely enclosed in a cast-iron frame and operates on either 110 volts, 60 cycles, alter- nating current, or direct current 110 volts. The motor is fitted with a speed control, and may be used on 220 volt circuit with suitable resistance. The bowl in which the sample is placed is of aluminum with a cover of aluminum. The outside bowl or shell is of copper and fitted with a two-piece cover, the smaller of which is removed when adding additional solvent. All of the special features of the smaller type No. 20408 are incorporated in this machine.......... 125.00 20408. Dulin Rotarex, Small Model, for determining the mineral aggregate in bitumen pavements. The asphalt receptacle of aluminum has a removable cover but solvent can be added as required without removing same. The solvent used is non-inflammable. Samples of 10, 25 or 50 grams may be run with accurate results. The motor used may be connected to any 110 volt direct or alternat- ing current (except 25 cycles or less). Time for extraction is 5 minutes, leaving the mineral aggregate perfectly dry so that grades may be determined................. Soleg Foe aeeneite 60.00 No. 20448 No. 20436 ferro 3) No. 20472 No. 20420 No. 20484 No. 20488 No. 20492 APPARATUS FOR TESTING COAL TAR AND REFINED TARS, OILS AND PITCHES DERIVED THERE- 20412. 20416. 20420. 20424. 20428. 20432. 20436. 20440. 20444. 20448. 20452. 20456. 20460. 20464. 20468. 20472. 20476. 20480. 20484. 20488. 20492. FROM as adopted in the Standard Methods of the Barrett Manufacturing Company, New York. See Journal of Industrial and Engineering Chemistry, April, 1911, March, 1918, and May, 1914. The apparatus, listed below, is only the special apparatus required for these tests. The regular apparatus, such as tripods, burners, clamps, ete., are to be found under their respective headings throughout the catalogue. Complete lists of both the special and regular stock apparatus required for the various tests will be sent upon request. Special Apparatus required for Water in Tar Test Copper Still, with steel clamps, inside dimensions 6 x 34 inches, with six paper gaskets.......... 13.25 s same as No. 20412. but larger size, i.e., inside dimensions 7} x 5 inches............. 17.00 Ring Burner, brass, to fit small still No. 20412. . ate pds Gaile sichke bose eee 1.90 at - Seranlarge, INoo20416s2 see sivas coe wh baja ee 1G eee 3.25 Connecting Tube, of glass.............. ae wlbsssdeb os oce sedlela ejb Soe eRe oo 25 Condenser Trough, of copper, on supports, with wooden base..............00000+-00 eee eeee sees 8.00 § Tube, of glass, to fit Condenser Trough No. 20482. .............--eecceevcecececeree 20 Separatory Funnel, with stopcock, capacity 120 cc............... S Je eiiotne, sa alert were eee 3.00 Special Apparatus required for Specific Gravity Test Specific Gravity Bottle, Barrett modification of the Hubbard form. 50 ec capacity.2....see sete -90 Special Apparatus required for Free Carbon Test : : Extraction Apparatus, Barrett modification of the Cottle, or Underwriters’ form. Complete with flask, cover, coil and basket of German silver wire... Jninehisiontseectee Stee anaes 3.50 Glass Flasks, only, for above Extraction Apparatus : er Bat eon aco tond: -40 Wire Basket, of German silver, only, for above Extraction Apparatus............-..+..+- -50 Cover and Coil, of block tin, only, for above Extraction Apparatus............ Js aoeeee 2.60 Schutte Penetrometer, withioneplue...e) ob. ese) ee ee ee ee 3.50 Plugs, only, for above Penetrometer, each...... Se eee o/SSiad e(Sb.cidke: dials ard bOeeeees 25 5 Special Apparatus required for Melting Point of Pitch Test Pitch Mould, consisting of iron clamps with brass block ea ttaoe A EAS oo = a0 - 5.00 Thermometer, for melting point, etched onstem, 0- 80°C.iniths.. lea 4.50 s se s fs SS SS 60=1402C Sint thse Mor ss Special Apparatus required for Melting Point of Hard Pitch Test Air Melting Point Oven, of copper, with mica window, removable tray, etc..............--.+--- 10.75 Special Apparatus required for Evaporation Test Evaporating Dish, of pure nickel, with flange and handle olisvaseie leas toc oO CR ARO ee 1.90 : Special Apparatus required for Slide Test Slide’Box, ‘of ‘copper, with!six corrugations.» ..... 2204. 200s. Joo. oceec ean ee eee eee 7.00 No. 20500 ae No. 20496 No. 20504 No. 20508 No. 20516 No. 20520 Special Apparatus required for Light Oil Test PUSS b EEL eEmpellMistilling: Nueva oe ces. oc cave ae eens tte Sais Aas one ice cs ae OE ae ae tees SOU! Special Apparatus required for Standard Creosote Oil Distillation. 20500. Retort, Resistance Glass, 250 ce capacity. Made to special dimensions and with neck set at special angle otherwise similar to regular retorts which, however, are not suited for this work....... .45 20512. Asbestos Sheet, specially cut to fold into cover for retort.................... ee ae pee fo0 20514. Thermometer, graduated from 0 to 400° Cin 1°. Made specially for this test.................... 5.00 ADE, © (CUI ESTE 2A 1 eee S elnino. obama ene Eee ORI nate a aie een SG mee imonitor Be ratte esasndhs ete -35 Special Apparatus Required for Additional Creosote Oil Tests 20508. Separatory Funnel, with ground glass stopper and stopcock, graduated to 100 ec; for heavy oils.. 2.50 20516. Atom Models, Kekule-von Baeyer, consisting of 15 nickel plated binding posts with two clamps, 20 black balls with four connecting posts, 10 red balls with two connecting posts, 30 white balls, 10 yellow balls, 10 green balls, 10 violet balls, and 10 silver colored balls, each with metallic tubulations to slip on posts. Dutyzhrees. ye eee eens 13.50 Stockett alcatel sete 20200 20520. Atom Models, Eiloart, consisting of six wooden models, six straight pins, six hinged pins, forty japanned tin caps, with formulae, ete. Muty Breeicsc. o.:.2 2 Joneatioass L800; ~ “sem # DutyfPaidier errr ce ooo ae so 27.00 No. 20524 20524. Atom Configuration Models, Wislicenus, for organic chemistry; consisting of 26 models with wire supports; 5 cm size. Duty Free............. SOROS Begs SnoDs wHecosEEOatebooamneoosodauor: CAV Single Carbon Atoms for use in the construction of special formulae. Duty Free, per 100. 9.00 20532. 20536. 20540. 20544. No. 20528 : No. 20544 Autoclave, or Digester, for 25 atmospheres pressure. Retort is of hammered copper with lid of phosphor bronze. Pressures given are the steam test pressures, the working pressures being approximately 20% less. The working pressure is indicated on the manometer by means of a red mark. Without burner. Inside Dimensions, mm : a : ROUTES 100 x 200 125 x 250 Capacity, liters * .cesss Duty; Breese oe ec cccce Meche sues Se es ye eee 37.80 45.00 SLOG eee osnt epee eee ae sco Me eC er er ; Epeeeoe lt) 60.00 Autoclave, same as No. 20528, but for 60 alInoepReres pressure. Inside Dimensions, mm....... ia vaca : ... 100x200 125 x 250 Capacity, liters : BAER AS 2 1f 38 Duty Free _.. 55.20 71.10 Stock. . : Sara necc 73.60 94.80 Autoclave, or ‘Digester, for 50 atmospheres pressure, with bolted lid. This construction is recom- mended for autoclaves of large capacity and for high pressure. Otherwise the construction is identical with No. 20528. Inside Dimensions, mm EAP he ; See 00 x 250 225 x 350 Capacity, liters woe eee eee e eee 13. Ses Duty Free... sis a tags Oe 135.00 168.00 Duty Paid.. 2 ae. Reine 180.00 224.00 Autoclave, same as Ne 20536 but for 100 Wabnigep Date S pressure. Inside Dimensions, mm......... ; wens s «eee 200K 250225 Exou Capacity, liters........ ee 7} Bae Duty Free... Bas : : xe 234.00 288.00 Duty Paid.. SSE rane _ 312.00 384.00 Note—The above autoclay es are furnished entirely of cast iron, for oper ation where ammonia is freed, on special order, at 5% less cost. Autoclave, or Digester, tested to 12 atmospheres pressure, with inside dimensions of 65 mm in diameter and 160 mm high. With bolted on lid, safety valve, manometer, etc., very convenient where small capacity is desired as it may be supported in an ordinary retort stand ring. This auto- clave is also furnished entirely of cast iron on special order. Duty Rreeyss.2 ac ae ee ees oO) Stock: 220-00 eh eee eee 38.40 20 AS Re seth Us IR Eis Th Hee Ome Mh At es Go Oy WE IP AS IN 3¢ BACTERIOLOGICAL, HISTOLOGICAL AND SEROLOGICAL APPARATUS AMERICAN STANDARD INCUBATORS are built under our personal direction in the first sheet metal factory in the U. S. to take up (some twenty years ago) the manufacture of sheet metal apparatus for bacter- iological work, and they embody twenty years’ experience in both the manufacture and selling of bacteriological apparatus. The Incubators are made of heavy polished copper covered with a water-proof, non-conducting material. All are of the latest triple wall construction, which provides space for both warm air and water. The walls of the water jacket are thoroughly reinforced to prevent bulging, due to lateral pressure of the water, a defect very common in low priced utensils. The bottoms are conical in construction to evenly dis- tribute heat, and to evenly heat the water spaces on all sides, by a circulation of hot air, thus giving equal and uniform temperature. The products of combustion and the hot air pass out by a side ventilator on top of the incubator. A glass water gauge with stopcock which shuts off the water from the gauge in case the tube is broken, is provided. A metallic tube through the air jacket connects the thermo-regulator with the burner and all burners furnished with incubators connect with this pipe by means of flexible metallic tubing instead of the rubber tubing previously used. This is an important feature and greatly minimizes the danger from fire. The closed in bases are of sheet-iron properly ventilated and furnished with a mica window for observing the flame. All incubators are furnished with carefully prepared instructions for installing and adjustment. Any of our American Standard Incubators, whether for gas, oil or electric heating, can be used as paraffine embedding ovens at temperatures up to 70° C. In the cases of oil and electric heating this specifica- tion should be given at the time of ordering to insure proper adjustment of regulators. American Standard Incubator American Standard Incubator with with Equipment Dd, for Electric Heating Equipment Cc, for Oil Heating This electric heating and temperature control This device for oi) heating incubators is entirely operates equally well on direct or alternating current. new and is much simpler in operation and control Electric heating units can at any time be removed than anything heretofore offered. The regulator is and incubator operated for gas heating. There are on the principle of the Roux metallic which directly no exposed terminals and apparatus operates directly operates the damper over the lamp, permitting on the circuit. Before shipment each incubator is either the escape or the utilization of the heat. tested to maintain a constant temperature. In order- Under proper conditions will regulate to 3°. ing it is necessary to state voltage and whether for direct or alternating current. EQUIPMENT Aa consists of Roux bimetallic thermo-regulator, incubator thermometer, and Koch safety burner with flexible metallic tubing attached. EQUIPMENT Ce consists of oil lamp heater, Roux bimetallic thermo-regulator and incubator ther- mometer. EQUIPMENT Dd consists of incubator thermometer, and electric heating units with electric thermo- regulator. 21 20600. 20604. 20608. 20612. 20616. 20620. 20624. 20628. 20632. 20636. 20640. 20644. 20648. 20660. 20664. 20668. 20672. 20676. No. 20600 No. 20632 Incubator, American Standard, Board of Health Type, inside dimensions 25x30x18 inches. With double doors and mounted on base 32 inches high with enclosed compartment for burner. With- out burner, thermo-regulator or thermometer................ vis : aie LOoeUO) Incubator, American Standard, as above, with E quipment Aa for gas he: ating Be Ave rete 2 00L00 ss es of a ae Ce for oil hes ating. ; =o pee E200 sf es ff Y Bs Dd for electric heating.............. 257.00 Incubator, American Standard, Board of Health Type, inside dimensions 18x 30x14 inches. With double doors and mounted on base 32 inches high with enclosed compartment for burner. With- out burner; thermo-rerulator/or thermometer. .)....-+..<.s::eees ee eee eee ee aie5O) Incubator, American Standard, as above, with 13) quipme nt Aa for gas s he ating. ee pie cae elk ne ef S a os Ce for oil heating ic, eke 00 es &s ss ss es ss Dd for electric he: ating. . Be ail) Incubator, American Standard, College Type, inside dimensions 28x 18x14 inches. W: ith single door, and mounted on base 27 inches high, with enclosed compartment for burner. Without burner, thermo-regulator or thermometer................0.ss000es000 sidan tayey LOSEOD) Incubator, American Standard, a as abov e, with E iquipment Aa for gas heating f Bae oo: 155.00 Ce for oil heating. . ia4pa ya eee 165.50 se ee oe sf Us sf Dd for electric heating.............. 200.00 Incubator, American Standard, College Type, inside dimensions 18x 18x12 inches. With single door and mounted on base 31 inches high with enclosed compartment for burner. Without burner, thermo-repulator or thermometers sects seis cess seo is cohesion erence ieee 105.00 Incubator, American Standard, as above, with Eb iquipment Aa forgas heating. =. --ee- = ae 122.00 sf Ge'for.otlheating?:).--eee ee eee 131.00 ss ss 2 Dd for electric heating PES s o Aned 163.25 Incubator, American Standard, Hospital Type, single door, on 11 inch enclosed base. Inside dimen- sions 20 x 18 x 10 inches. Without burner, thermo-regulator or thermometer . A The 90.00 Incubator, American Standard, same as above, but with) Hiquipment) Ala... 2 acres ener 107.00 ‘Equipment Ce... a5 5.0 00 116.00 Equipment Dd..... Meier OO 5c 148.25 No. 20648 No. 20712 No. 20696 Incubator, American Standard, Hospital Type, inside dimensions 19 x 12 x 10 inches. thermo-regulator or thermometer Incubator, American Standard, same as above, but with Equipment Aa ee se ee “Equipment Ce ss ee os STs s Equipment Dd Incubator, American Standard, Hospital Type, inside dimensions 9} x 12 x 93 inches. thermo-regulator or thermometer . Incubator, American Standard, same as above, but with Equipment Aa oe ee eS ss “Equipment Cc . Equipment Dd. dimensions 10x8 x8 inches. bacteriological work. Inside as well as for Incubator, Physician’s Laboratory, double wall. mended as a satisfactory paraffine oven thermo-regulator or thermometer................ Incubator, same as above, but with Equipment ‘Aa Incubator, same as above, but slightly wider, 1. e., recommended where burner, thermo-regulator or thermometer.... Incubator, same as above, but with Equipment Aa.. inside No. 20664 dimensions 12 x 10 x 10 inches. a low priced, servicable incubator or paraffin oven is required. No. 20680 Without burner, 78.00 Without burner, 45.00 60.50 . 69.50 100.25 Specially recom- Without burner, .. 36.00 se Giles Especially Without . 43.50 59.00 — Ne. 20760 HEARSON INCUBATORS. These incubators consist of a water-jacketed chamber made of stout copper surrounded by insulating material and the whole encased in wood. They are provided with an inner door of glass and an outer one of pz anelled wood. In the two larger sizes the doors are double. The distinctive feature is the temperature control by means of a metallic, hermetically sealed capsule which contains a few drops of liquid having a boiling point at or near the temperature which it is desired to maintain in the heating chamber. The regulation is established by the expansion of this capsule owing to the boiling of its contents which provides the motive force for operating the control lever. This expansion takes place “only at the predetermined tem- perature. The lever will only be acted upon when the critical temperature is reached, no sensible effect being produced at even one degree below that at which the capsule is desired to act. A sliding w eight compensates for slight barometric variations and, in addition, controls within certain limits the boiling point of the capsule so that a range of 8° C. is possible with any particular capsule and the total range by means of these capsules is from 16° C. to 175° C. This system of temperature control applies equally well to gas, oil or electric heating and also to the con- trol of the low temperature incubator for gelatine cultures operating at 20° C. These incubators, although comparatively new in the United States, have been used for a number of years with great success in leading ‘Europe an bacteriological laboratories, particularly those of the Pasteur Institute in Paris. Instructions for operating are furnished with each incubator. HE ARSON INCUBATORS FOR GAS HEATING. The Excel- sior Gas Valve used in the control of incubators heated by gas and operates as follows:— A is the inlet for gas; C the outlet to burner; BD a lever pivoted to standards at G and acted upon by the capsule, through the needle which enters the socket below the screw P. The construction of the acting portion of this valve is such that whenever the end B of the lever BD presses on the dise below the end B, the main supply of gas is entirely cut off. At such times, however, a very small quantity of gas passes from A to C, through an aperture inside the valve, the size of which aperture can be adjusted by the screw needle S, hence the gas flame below the incubator is never extin- guished. The expansion of the capsule, owing to the boiling of its contents, provides the motive force for acting upon the lever BD. SHARE Ae Roe aly er > OR H. ie Voss Oh eMi ALS CeOle Ma Pe AE NG SY Changes in the atmospheric pressure, tend to make the temperature fluctuate about 1° F. on either side of the normal, if observations be taken extending over considerable intervals of time. To compensate for these variations, a sliding weight runs on the lever-rod D. It also retards within certain limits, the boiling point of the capsule, and thus adjusts the temperature at which the capsule shall expand several degrees above that at which (with the weight to the left) it first commenced to act. In actual practice it is found that the temperature can be maintained within half a degree without re- adjustment of any part, for months together, and this, too, in spite of great changes of gas pressure, and of air temperature in the room in which the apparatus is working. No. 20740 Hearson Incubators for Gas Heating, with capsule adjusted to 373° C. unless otherwise ordered, with thermometer, suitable burner with two chimneys, 4 ft. of flexible metallic tubing, etc. Inside Measurements Duty Free Duty Paid 20728. Incubator for Gas Heating with one shelf.... ; 6x 6x 7 inches $28.95 $43.45 20732. é Soars ae Sy aS eae Be AEC Oe LD er clo. oul Pap ae 36.00 54.00 20736. nF a Peles ve ae SS a oe — IPAS. IPS ye ie! a 45.00 67.50 20740. = Sana os “two shelves... seat sap Lbyeediyseaye oy 65.55 98.35 20744. fs soe Pass NY ES ss ss cere eels ae 20) x20 ex 24 93.15 139.75 20748. Incubator for Gas Heating, with three shelves........ IES. Ses SEs 100.80 151.20 20752. Incubator for Gas Heating with four shelves ...... Site PHS 36 Moe GY 192.00 288.00 20756. Incubator for Gas Heating, with center division of six shelves and with the glass door arranged in four divisions to prevent loss of heat when exam- Inside Measurements Duty Free Duty Paid ining cultures. Specially made for milk cultures 60 x 24 x 60 inches 270.00 405.00 20760. Incubator for Gas Heating, specially designed for the Pasteur Institute, Paris, for the cultivation of tuberculin. It is fitted with eight copper trays with holes for the passage of air; with two double doors on each side. Fresh air is admitted by four tubes in the bottom and emitted through a regulating ventilator on the top. A special Inside Measurements Duty Free Duty Paid feature is the equal temperature all over the interior. 31 x 27; x 26 inches 194.25 291.38 Note—Nos. 20728, 20732, 20736 and 20740 are usually in stock for immediate delivery. HEARSON INCUBATORS FOR OIL HEATING. The Patent Capsule control lends itself particularly to incubators heated by an oil lamp. The heat from the lamp passes through a flue across the bottom of the incubator and returns again to the lamp by another flue parallel with the first and is then conducted to the open air by a second chimney as shown in illustration. When the degree of heat reached in the chamber is sufficient to expand the capsule the lever will rise and lift the damper from the lamp chimney and after a short period the damper will be found to hang steady in one position and the temperature remain constant. These utensils may be adjusted for higher temperatures for use as par- affine embedding ovens when so ordered. 25 No. 20764 No. 20786 Hearson Incubators for Oil Heating, with capsule adjusted to 373° C. unless otherwise ordered, with _ther- mometer, Suitable burner with two chimneys. funnel, 1 yd. of wick, ete. Inside Measurements Duty Free Duty Paid 20764. Incubator for Oil Heating, with one shelf... Be 6x 6x 7 inches $28.95 $43.45 20768. sf Gee a: a ae Sixes 9 ex 2 36.00 54.00 20772. 3 1Zexel2ixal4ay 45.00 67.50 20776. £ Sc Se ce Gt Gsm. cbs se ej oe 65.55 98.35 20780. ss £Se ons oe be BE Ae 20 axe 20 xa 93.15 139.75 20784. x Scene Ke Us Lt gC : 1Siex 4x So es 100.80 151.20 HEARSON ANHYDRIC INCUBATORS FOR ELECTRIC HEATING. In these incubators the heating effect is produced by an even distribution of one or more electric resistance wires, covering every part of the apparatus otherwise occupied by the water jacket. Suitable terminals con- trolling each wire permit of the resistances being utilized in various combinations in order to provide for high or low temperatures, or to enable the operator to adapt the same apparatus, within certain limits, to different voltages. They work equally well on alternating or direct current, it simply being necessary to specify voltage. Owing to the elimination of the water-jacket, this system of heating is not restricted to temperatures below the boiling point of water, but can be applied to drying ovens, sterilizers and other apparatus for which much higher temperatures are necessary. Apparatus constructed on this principle heats up much more quickly because there is no large volume of water to be warmed. Regulation of temperature is effected by the alternate collapsion and expansion of a capsule as in all the foregoing thermostatic apparatus, and eventually a steady mean temperature is attained. Hearson Incubators for Electric Heating, with capsule adjusted to 373° C. unless otherwise ordered, with thermometer, wall plate and plug, flexible leads, etc. These incubators operate equally well on direct or alternating current but voltage must be stated in ordering. Inside Measurements Duty Free Duty Paid 29788. Incubator for Electric Heating, with one shelf eek | OLX Oyxeeamehes $31.95 $47.95 20792. sé G ue oe es ss s ae : Hos Bac iy — & 39.60 59.40 20796. u cs a ss ae ce s 5 base ise ib 49.50 74.25 20800. oe ce = ue “two shelves 15 ox 15x 18S 67.50 101.25 20804. ce SS ce ss Seposs « : =) 20) x 205x7247 102.45 153.70 20808. Ke @ fe x oS dec, © : ey Se aki se 655 110.85 166.30 26 20812. Size 24 20812. Size 40 INCUBATORS, FREAS’ PATENT ELECTRIC. These incubators have no water or water jacket and the 20812. adjustment is set at the temperature required by simply turning a milled head. Construction—The incubators are constructed of heavy asbestos wood, with cast aluminum door and door frame. This asbestos wood is absolutely fire- -proof and possesses unusual insulating qual- ities. This latter quality and the large thermal capacity of the body of the incubator assist the maintenance of an even temperature throughout the chamber; the air space between the inner and outer walls is filled with insulating material, which results i in a very low heat loss, thereby reducing the current consumption to a minimum. The interior is fitted with aluminum racks, allowing the perforated metal shelves to be placed at any desired height. There is provided an inner door of heavy glass, fitted in an aluminum frame cushioned with felt to exclude air, thus permitting inspection of the chamber without opening the door and cooling the incubating chamber. An opening through the top of the incubator to the chamber is provided for a ther- mometer. Regulation—The regulation device is made entirely of metal, substantially built, so that it is practi- cally impossible for it to get out of order. Its action depends upon the expansion of a metal tube running through the chamber from top to bottom, operating a lever which ‘‘makes’’ and “breaks’”’ a contact, with proper means to prevent arcing. The lever is extended to serve as an indicator, operating up and down the graduated temperature scale on the outside of the incu- bator. The indicator is moved to the temperature desired by turning the milled-head screw at the bottom of the scale. The regulation is sharp and accurate to a fraction of a degree and remains so indefinitely. Temperature Range—The temperature range of the incubator is from a degree or so above the sur- rounding air temperature to 60° C.; the regulating device operates just as satisfactorily at lower as at higher temperatures. Heating Element—The heating element consists of a wire wound resistance plate situated at the bot- tom of the incubator. While there may be no need to remove it, it can be very easily taken out if desired. The plate is wound for 75 watts, about 50 watts being required to maintain a tem- perature of 373°. Incubators, Freas’ Electric.......No. 20 22 24 26 28 32 36 40 Inside Gimiencions, inches...... 7x7x10 7x7x10 12x12x12 12x 12x12 16x 14x16 18x 16x20 26x 14x22 32x 18x24 Each... PS Re O50 iS 150 80L00 87.50 140.00 190.00 225.00 270.00 Note—Nos. 22, 26, 28, 32, 36 and 40 are provided with switches, one for the current and the other for the electric lamp illuminating the chamber. Nos. 28, 32, 36 and 40 are furnished on high bases, as shown in illustration. Nos. 36 and 40 can be furnished with compartments for students’ use. Prices on application. SUPPLY MAINS CAPSULE SWITCH No. 20816 Arrangement of Hearson Electric Incubating Room.Temperature Control, showing Control Capsule, Automatic Switch and Blow-out Directions for Constructing an Incubating Room and for Installing Electric Temperature Control. The room should be constructed of brickwork 9 inches thick and perfectly square inside, 6 x 6 ft. and about 7 ft. high. There should not be any windows, but two doors, the outer door being closed before opening the inner door of the chamber. These doors should be made of white pine 2 inches thick and the walls glazed or covered with parian cement and the floor and ceiling insulated with slag wool. A 9-inch ventilator should be fixed near the ceiling and nine 1-inch holes in the bottom of each door. Attach the Automatic Switch and blow out 01 marble base outside the room to be heated, in a convenient position and bring the main supply to this switch and connect at the back of switch base. Place the four Ra- diators in the incubating room, one on each side between the first two shelves (not on the floor) and carry wires from the Automatic Switch to each Radiator in parallel and connect to the terminals indicated. Place the Capsule Switch with lamp about the height of the third shelf (not against the wall) and carry wires from this to the Automatic Blow-out Switch and connect to terminals indicated. The installation is then complete and the current may be turned on. The Radiators will heat up and con- tinue to do so until the Capsule expands and interrupts the current, when the magnetic coils will drop the arma- ture and the current will cease to flow to the Radiators which will cool down until the Capsule again collapses when the current will be again switched on. This will continue automatically. To increase the temperature screw down the milled head screw on Capsule Switch a turn or two at a time; to decrease the temperature reverse the process. See that the carbons on the Automatic Switch touch each other perfectly, otherwise a spark of eruption will oceur and cause rapid deterioration. There must be no spark- ing except at the moment of breaking contact 20816. Incubating Room Temperature Control for Electric Heating, Hearson, as above described. When the capsule is collapsed the lever arm is kept in position by the solenoid, and the current is free to pass to the heaters. Upon the expansion of the capsule contact is broken, the solenoid ceases to act, the lever arm drops suddenly and the current to the radiators is checked and by means of the electric blow-out, the sparking is reduced to a minimum. The current remains cut off until the temperature of the room is so reduced as to allow the capsule to contract and contact again be made. The outfit consists of capsule switch, four radiators and blow-out panel switch and is based on keeping a room 6x 6x7 ft. at a constant temperature. Larger rooms must be supplied with additional radiators. Price of outfit for either direct or alter- nating current. Duty Free 94.50 Duty Paid:......4 2 eee oo JAE Pe Re) ae SU). OR ale i Je Oe My ASS CeO Mie Ps Aaa Ni oy, 20820. Incubating Room Temperature Control for Gas Heating. With a well insulated room a uniform temperature can be maintained within 2° with the use of the gas valve regulator and a suitable gas stove. It is advisable to arrange ventilation in both the lower and upper parts of the room for the purpose of temperature equalization and avoidance of smell from the products of combustion and gases of fermentation, etc. The regulator may be placed at any con- venient position, usually near the door. Price is for gas valve WAT CApsuleronlivners=cer ae seer et ieee sere ere erates omer rare 13.50 No. 20824 20824. Incubator, Hearson New Compartment. For either high or low temperatures. Consisting of nine compartments of copper, water-jacketed and insulated, each compartment being 7 x 8 x 6 inches. Temperature may be adjusted from 25-32° C., 32-40° C., 40-47° C., or any other pre- determined range. Each compartment is fitted with a Hearson control capsule which automati- cally controls the entry of warm water from the heating tank either into the water jacket surrounding each compartment or to the waste. A difference in temperature of less than a degree in the compartment suffices to change the flow of warm water. A control capsule is con- nected with the heating tank alsoso that the supply of warm water is constantly under control. All the compartments may be operated independantly of one another. ULV RKC Or cctac ce eine Voss eeitein sack $345.15 Duty sR ald sores ie aakoseet ara ee $517.75 | 20828. Incubator, Embryological, Hearson Cras l fi : Electric, operating on the same * LON WS | Hn principle as the Hearson bac- cea i teriological incubators previ- ously described, capacity 450 eggs. This is a very much more convenient apparatus than the usual chicken incuba- tor used for embryological pur- poses. Voltage must be speci- fied in ordering. Duaty2hrees ee ee 37.80 Duty Paid Reet hater 56.70 No. 20828 20832. 20836. No. 20832 Incubator, Compartment form, for different temperatures in the various compartments between 24° and 60°C. Each compartment is 30 x 20x 25 em. With both glass and metal doors. With burner, thermo-regulator, etc., but without thermometer. With ten compartments as shown in illustration. Duty Free 396.00 Duty: Paid: .. nD 4 .c Cc Da ae J aE, e) = > 1) (@) fo) = ea > TL, x WATER a & { Tesh55h! || bBbbbbh No. 20848 No. 20864 LOW TEMPERATURE INCUBATOR, HEARSON MODEL GC, for operation with a constant flow of water. Most of the low temperature incubators can only be worked successfully as long as the external air is 10° below the temperature required in the incubating chamber, and the expedient sometimes resorted to of running cold water through them to keep the temperature down can, in summer time, be adopted with advantage, but the results are not altogether satisfactory, cultures being frequently spoiled by an unexpectedly warm day or night. In summer, therefore, or in hot climates, cultivation of gelatine can only be considered safe in an incubator using ice, and the special feature of this incubator is that it will automatically remain constant at 20° Cent., or any other predetermined temperature, using only the theoretical amount of ice requisite to obtain this result, even though the external air may be 30 or 40 degrees above the temperature desired in the interior. With capsule adjusted to 10° C. unless otherwise ordered, with thermometer, ice funnel, gas fittings and 4 ft. of flexible metallic tubing (or, if for oil lamp, 2 chimneys and 1 yd. wick) and packing. With suitable burner for either oil or gas heating. Please specify when ordering. Inside Measurements Duty Free Duty Paid 20844. Low Temperature Incubator Model C.......... : 9x 9x 12 inches $65.25 $97.90 20848. ee ss ns SO eral : hs L2exel2ex 45 93.15 139.75 20852. fe fe = < Lanois nay ate BS elosxe To exwlS aac 117.30 175.95 20856. ss oe << hs peas Pe ; Ree oO mxe 20 Xe2405 ee 165.60 248.40 NOTE.—This Low Temperature Incubator is one of the most natistactorr bacteriological utensils we have ever sold and it has been supplied by us to leading Universities, City and State Boards of Health and U.S. Government laboratories. All of these users are unanimous in reporting satisfactory service. LOW TEMPERATURE ELECTRIC INCUBATOR, HEARSON MODEL G, for ice and electricity, working independently of any constant water supply as required in model C. This apparatus is identical with Model C except that an electric heater is provided which automatically operates when the room temperature is lower than the temperature required in the chamber and an electric motor which automatically circulates the water from melting ice to the water jacket when the temperature of the room is higher than the temperature re- quired in the chamber. No connection with a water supply is required and the apparatus may be set to operate at any temperature from 10° to 37° C. and can be operated in any climate and in any place where water and electricity are available. Control is by the Hearson capsule and full operating directions are supplied with each utensil. Voltage must be specified in ordering. Inside Measurements Duty Free Duty Paid 20860. Low Temperature Electric Incubator Model G Baoan .. 9x 9x12 inches 94.50 141.75 20864. a BEG AORE OEE ety ae, Sal ied ch in 119.25 178.85 20868. s e ss ue * Oe an oeaae el ONRy LO Kado, 159.00 238.50 20872. “ x ss ef on Nejmetasas cllattes nar OO gas E 210.00 315.00 31 20876. Incubator, Low Temperature, Giddings. The incubator proper is regular water-jacketed type with outer air space and covered with a heat insulating material. Be- neath the incubator is an ice chest fitted with coils of pipe, which are connected to the water jacket of the incubator so that the water may circulate freely. In the pipe line is a pump operated by an elec- tric motor. This motor is con- trolled by a thermostatic bar which makes and breaks the circuit through a solenoid switch, ener- gized by the line, thus rendering the operator independent of the troublesome dry battery. The regulation is effected as easily as with the ordinary electric incubator, the temperature for which the thermostat is adjusted remaining constant within 3°. All parts are readily accessible, and the construction is very simple. To put the equipment into oper- ation it is only necessary to con- nect the feed wires and turn on the current. The cooling arrangement per- mits practically any desired tem- perature below that of the room to be maintained. If a temperature below the freezing point is required, cracked ice and sodium thiosul- phate (hypo) are placed in the ice- chest, while from 4 to 12 liters of water are drawn off and replaced by a solution consisting of 50% of glycerine and 50% of alcohol (95%). Please specify voltage and cur- rent in ordering. If for alternat- ing current also state number of cycles. See Phytopathclegy, Vol. IT, p. 106, 1912. Size, em. .45x75x35 70X45X35 48X45x35 Each...... 290.00 270.00 235.00 Size, em. .48 45x24 483024 243024 Each.....- 210.00 190.00 170.00 No. 20876 20880. Coagulator for Blood Serum (Inspissator), Hearson An- hydric Electric, operating exactly the same as Hearson Incubators. For 40 tubes. Voltage and tem- perature must be given when ordering. Complete with ther- mometer. Inside dimensions 223 inches long, 103 inches wide by 3 : inches deep, holds four trays each CHAS HEARSON ac ue containing 10 tubes. Tonean ys Duty Free .... 39.00 Duty Paid 2 oS.o0, No. 20880 | | } C} i) No. 20884 Hearson Cellular Incubator for Students’ Use. This Incubator is heated by gas or electricity and the fittings for regulating the temperature are the same as in those previously described. Prices given below are for gas heating. Electric heating adds $21.00 duty free and $31 50 duty paid to the list prices printed below. This utensil is designed for use in educational laboratories where it is desirable to provide each student with a separate incubating chamber or drawer which may be removed from the apparatus without affecting the temperature of the remaining drawers. The inside of the utensil is strongly made of heavy copper, firmly stayed at frequent intervals. Each drawer of the size 13} x 8} x 4} inches will accommodate about 60 culture tubes. Seven flat copper tubes, extending the whole length of the drawers, form the sides and divide the appa- ratus into six vertical compartments; these are again sub-divided by eighteen terne-iron shelves, into four divisions horizontally, thus forming twenty-four pigeon holes water-jacketed in every case on two sides. All the vertical tubes are joined to horizontal tanks at the top and bottom, so that the water is free to move up or down any of the tubes, or even up and down different parts of the same tube, thus equalising the temperature in all directions. The drawers are made of terne-iron, which is not liable to rust, and each drawer has a thick varnished wood front, bearing a number which serves to show the order in which they should be replaced and enables the student to easily recognize the compartment allotted to him. The removal of one or more drawers does not appreciably affect the temperature of those which remain, and when the outer doors have been closed for a short time the temperature is practically the same in all parts. Duty Free Duty Paid 20884. Cellular Incubator, for Gas, with 24 drawers, each 13} x 83 x 4% inches..... $172.50 $258.75 20888. oy ss ee se, Cx 425 x14 es ‘ 136.50 204.75 20892. ss ae ee ele a soe 9) ox 92x 14 Sw esas 183.00 274.50 33 > ve) | < (= Pe) c -] He Os Ma eAg es CC. +O) IMT SES Aw aN < No. 20896 20896. Coagulator for Blood Serum (Inspissator), Hearson, with Patent capsule temperature control, for gas heating. The utensil isstrongly made of copper, with trays holding serum tubes at a proper angle. To hold, tubes. . EA Bren erie Ree rice her : IER Re Re 20 lis ; 40 __ Duty Free : : re See E 4 39.00 52.50 Duty Paid Fateh ated ea Sea ete RT TA SPIDER C Rte a rtts cho Sie sede at) 78.75 No. 20900 No. 20904 20900. | Coagulator for Blood Serum (Inspissator). The two front legs are slotted so that the oven may be tilted for securing necessary slants to the test tubes. Of same construction as American Stand- ard Incubators. Without thermometer, burner or thermo-regulator. Inside dimensions, inches.................--. Joes os ee a aL exe Opes 16 x 14 x 23 Duty Frees scche so snonneene closer 26.25 Duty Paid: ....282%,... ee aera 39.50 34 > [al MOTTE Mijj}, Wy & CTS No. 20908 AS di a || HANNAN ‘i i ; | i A No- 20912 This apparatus consists of a strong cop- Water Bath and Incubator, Hearson, for Wasserman Test a stand. The incubator is a double sided reservoir and is pro- It is intended to be used on a bench facing the light. On 20908. per vessel, nickel-plated, on vided with a glass front and back. the side of the apparatus a small tank is fixed, to which Hearson’s control capsule is attached This is regulated for 56 to 60° C. for the sterilization of liquids, and is provided with two per- forated plates, one to take ordinary test tubes and other for small tubes. It is also provided with a hinged cover held in place by a spring which is laid over the wadded stoppings of the reagent tubes in order that they may remain in the water. The incubator itself is fitted with Hearson’s control capsule and is regulated for 38° C. Thermometers are provided for two compartments, also two racks. The whole forms a very useful and complete set for the study of the Wasserman process. Duty Free.. San HD) Duty Paid.. 80.00 20912. Water Bath, Hearson, for Wasserman Reactions, etc., with Hearson Patent C apsule ‘control and remov- able test tube racks and covers for same while in the bath. Each tray holds 36 tubes. Number of trays....... eee EL RRA te MIRO OU Ne 2 4 6 UWE Y COs case acces Shas eoec ey aueh aera, alla poy Yel. aeietepemstekafct ey Serarscey Sarena tek ey sveretegess 37.80 60.00 75.60 Sree avercval m RGecvotapele wie Tetal rela. a iavai/os tan’ cumtarateve sites sieves ore, Camswabe ps Nerepeetianer st 56.70 90.00 113.40 Duty Paid > 20916. 20920. 20924. 20928. 20932 Aly lel AU IR Hie TO MES ASS © “OF (MS BeAr IN < 16 1718 19 M20 URN No. 20816 No. 20920 Water Bath, for Wasserman and other Serological Reactions, Liefmann-Meier; with three metal test tube racks containing 72 tubes. The front wall of the bath is of glass and the back is finished in white to enable accurate observations of reactions without removing the trays. With two burners, thermo-regulator, and thermometer as shown in cut but without test tubes. Dutyehree)7 ea ae ee 33.10 Duty Paidio ss... hs eee 40.05 Incubator, Opsonic, ith 20 tubulations for pipettes, each with serial number. OF heavy, polished cop- per, on sheet iron base 8 inches high; with tubulations for thermometer, gas regulator and filler, and a cup 1 x 33 inches for holding instruments. Size 14 x 8 x 4 inches................. 17.25 Incubators Opsonic, same as above, but including 6 tubes, 7 inch diameter, in the top to hold test fUbesinnme.: Lo War tags OR OR, ee foe ‘ c 21.00 we : i ' i HIM rc No. 20928 No. 20932 Sterilizer, Instrument, convenient in the pathological and bacteriological laboratory for the steriliza- tion of syringes, instruments for animal operations, ete. The tray carrying the sy ringes or instru- ments is lifted clear of the water when the lid is raised and supported in this position. Of copper, nickeli plated) 10sec 5-x/8 IMches ses see ec eee eee el ene ee ine see a ea eee ee 15.00 Sterilizer, Instrument for purposes similar to above but for electric heating. With automatic cut-out which cuts off the current if sterilizer is allowed to run dry. Complete with 5 ft. of cord, con- nector and lamp socket plug. Apparatus is of copper, nickel plated. Dimensions 10 x 43 x2 inches. With three heats. wie Od Seine, ipl hee woo eee 18.00 20936. 20940. 20944. 20948. No. 20956 | “mm Hi) a me ij No. 20936 No. 20944 No. 20948 Autoclave or Vertical Steam Pressure Sterilizer, American Standard. Of heavy polished copper tin lined. Lids of heavy cast brass, nickel plated and fitted with steam-tight, ground in bevel joint, obviating entirely the use of washers. This apparatus is the most widely used autoclave in bacteriological work and has been supplied by us to many leading laboratories for over four- teen years, with unfailing satisfaction. Each apparatus is tested and guaranteed to stand a pressure of 35 lbs. to the square inch, and is provided with proper gauge and thermometer, reading both in temperature degrees and pounds pressure, also safety valve. With six screw clamps on lid. Prices on gas and oil heated apparatus include suitable burners. Prices on electric heating include cord and plug and electric heater. Inside dimensions 11 inches diameter by 24 inches deep. With gas heating Withoil heating With electric heating Method of heating. Sabo on do Dl OdOO Ame FOS CaO OOOUOS 5 equipment _equipment — equipment Hachteserpnom Pee. acho ate onan. Anas ae 60.00 64.65 100.00 OTD GIN 026 7 ; sdili 3 Autoclave, same as No. 20936, but with hinged lid. With gas heating Withoil heating With electric heating Method of heating. . “gandonnas Soobocrc ___ equipment equipment equipment Hachientsts. sc. a beyete chars vovere joys : = oyeks 65.00 70.65 105.00 Autoclave, same as No. 20936, but with ten screw clamps on hinged lid. Inside dimensions 14 inches is - bv 26 ine Ee diameter by <6 inc hes dee Pp. With gas heating Wilh oil heating With electric heating Method of GATING ey yelegt brainy ancich eycictty «yorara erecoroveraretoic equipment equipment equipment Bla chibe keg rtesie, tasers ath dete 90.00 97.00 130.00 apparatus. Boiler is of heavy, seamless hammered copper, heavily tinned on the inside, enclosed in enamelled iron outer ventilating jacket. Lid is of brass and all trimmings are heavily nickel plated. With tripod inside for supporting baskets, ete. Adjusted for a working pressure of 15 lbs., equal to a temperature of 121°C. Inside dimensions 200 x 400 mm. Duty Freese). 6.<)-1:. 2 63.00 Stock. .... 84.00 Autoclave, as above, with petroleum burner, for use where gas is not available. Duty Free..... ee 66:00 Ld na obtener o ed teas 88.80. Wire Basket, nickel plated, for above, with hinged lid, 200 mm diameter by 200 mm high, i. e., two baskets exactly fill autoclave. Very convenient for test tubes. Duty Free os OOD Stock : . 6.75 No. 20960 No. 20964 20960. Autoclave or Steam Pressure Sterilizer, Horizontal Form. No mechanical fastening whatever is used to secure the door and no packing or gasket is used to make the joint steam-tight. The steam pressure from within seals the door absolutely. The apparatus is made of heavy, polished copper with a double wall or jacket. Can be used for steam, gas or petroleum heating, but will be supplied for use with gas unless otherwise specified. Because of the double jacket the cotton plugs in the culture tubes are absolutely dry when the door is opened. When this sterilizer is supplied for direct steam connection the generator shown in illustr: ation is not required, for which we make an allowance of from $10.00 to $17.00 depending upon the size of the sterilizer. Inside dimensions, inches....... 16x12 20x16 24 x 20 28 x22, 28 x25 Each.. aaa ead A S.-82 2 2130200)5150200 175.00 250.00 333.00 20964. Autoclave or Steam Pressure Sterilizer, Horizontal Form, double cylinder type with steam space entirely Note. surrounding except at the door of entrance. A particular feature of this sterliizer is the fact that the contents of the inner chamber become perfectly dry within one minute after the steam is withdrawn. Ebonized or enameled bronze door and frame with copper end, seamless drawn brass or copper shell (tinned internally) forming walls of sterilizing chamber, jacket and all fittings. highly polished and nickel plated, mounted on white enameled tubular steel stand. Heating can be done by steam, gas or petroleum as ordered but will be supplied for gas heating unless otherwise specified. Inside dimensions, inches.. 9 x 19 12 x 20 14 x 22 16 x 24 20 x 28 24 x 32 DEX Us scigcnondadter: 175.00 225.00 300.00 350.00 450.00 = 650.00 When arranged for steam or gas heating, we recommend the use of the special auto-control valve, so designed that when the desired pressure is reached the supply is cut down just enough to maintain such pressure. This adds $10.00 to the cost of each of the above sizes. 38 20968. 20972. 20976. 20980. 20984. WILEY OF AIM ——> No. 20968 INLET OF AIR No. 20984 No. 20980 Hot Air Sterilizer, with Regenerative Heating System, so-called **Lautenschlager’’ form. Of best Russia iron, covered with asbestos on the outside. With three walls, providing two air spaces. When heated by gas, a row of small Bunsen burners placed around the outside of the base creates a circulating hot air current which passes as indicated by the arrows in the illus- tration. When heated by petroleum blast burner, or by electric units placed in the base, the circulation occurs in the same way. The electric he: te device provides one heat and includes cost of relay and regulator. A temperature of 360° F. (182° C.) may be had with the electric heater in 20 minutes. The gas heated sterilizer may be used ie either gasoline gas or natural gas by the use of adjustable burners in place of the regular. These are furnished upon order at a slight extra charge. Inside dimensions 12x 18 x9 inches. On low base, with thermometer, range 200° C. Style. so ches A aes oe - . With gas heating With oil heating With electric heating equipment equipment equipment IRC ss = 22 oc ste jeisvo noe pete 47.75 59.00 100.25 Hot Air Sterilizer, same as abov e, but with inside dimensions 18x 24x14 inches on low base, with thermometer Sty AEE Se eee eee With gas heating With oil heating With electric heating equipment equipment equipment DE etet el pat ob aehe Se oe 65.00 77.75 130.25 Hot Air Sterilizer, same as above, but with inside dimensions 24x30x18 inches on low base, with thermometer Style ba SANS eos .... With gas heating With oil heating With electric heating equipment equipment equipment LA Ss Oe Se eee See b.~ 110.00 128.75 4 _ 173.75 Hot Air Sterilizer, same as above, but on high base, with thermometer. Inside dimensions 30x36 x20 inches Sty le.. SNS a iet ot avetanebeteaees .... With gas heating With oil heating With electric heating equipment equipment pees oe Each..... .. 16625 196.25 263.7 Hot Air Sterilizer, double wall, asbestos covered, with built-in burners, for gas heating only, with ther- mometer. ; Inside dimensions, inches... ae x 24x 12 19x12x9 18 x 24x 14 Each... -. cya ane Ve Kee RES eerie “38. 75 31.25 46.25 39 No. 20988 No. 21000 Hot Air Sterilizer, double wall, of sheet iron, with enclosed base, asbestos mat, thermometer and burner. With two shelves. Inside dimensions 10x 12x10 inches...... Poe ENS Hot Air Sterilizer, same as No. 20988, but with one shelf and inside dimensions 9x 9x6 inches. 13.10 of sheet iron. double wall. Wall form, with fork to hold burner. Including ther- mometer and burner. Inside dimensions 11 x9 x9 inches cle sloieye nos Ls eee 15.75 Sterilizer, Freas Patent Electric. The general construction, regulating and heating of the Freas’ Elec- tric Dry Sterilizer is identical with that of the Freas’ Electric Incubator, the only difference between them being that the Sterilizer is graduated for temperatures up to 175° C. and accord- ingly provided w ith heating plate wound for 600 watts. The Sterilizer is not provided with inside glass door, while the insulation space between the walls is greater than with the Incubator, on account of the higher temperatures maintained. Inside dimensions, ht Pe aan Aa Saaenbe ct ao peee ston ve) 4 ae (e R H. ee Chie Om MiP ASS Ce OMe SP. eA N ~< A New AwnatytTicaL BALANCE TROEMNER? NO: 50°25 > 2 = = - $50:00) NET MADE BY HENRY TROEMNER, PHILADELPHIA, FOR THE ARTHUR H. THOMAS COMPANY No 21340 21340. Balance, Analytical, Troemner No. 50. After long cooperation with the firm of Henry Troemner, Phila- delphia, we are enabled to offer a Balance at $50.00, bearing his name and guarantee, but made specially for us, which will satisfactorily meet all the practical requirements of the analyst as well as any Balance now listed at $125.00. We will send this Balance to any responsible chemist subject to trial and approval and returnable at our expense if not satisfactory. This Balance is particularly recommended to industrial chemists because of its rigid and robust construction and is guaranteed to stand the daily wear and tear in a works laboratory. Sensibility—The Balance has a definite sensibility of ~; milligram under full load of 200 grams in each pan. Capacity—200 grams in each pan. Case—The case is of French polished mahogany with counterpoised front sash, with glass sash at the back, top and both ends. The base is fitted with a drawer and is provided with screw leveling feet. Beam—The beam is of aluminum alloy, 7 inches long and is graduated on the right arm into fifty divisions. The special feature of this beam construction is that it is designed to sup- port successfully without flexture a load of 200 grams in each pan, and that the knife edges are set rigid in the beam, thus doing away with any possible shifting which would make the Balance inaccurate and undependable. Release and Arrest—The beam is supported by a three point rigid beam arrest that has a full-away action and releases the beam so that the contact at the center knife edge is coin- cident with the contact at the end knife edge, thereby avoiding all jarring and possible injury to the knife edge by a sudden shock. Rider Carrier—The rider carrier is very simple in construction and is designed to be thoroughly effective and free from any possibility of derangement. Bearings—Of agate throughout. BYICes. ee noe eae : : Ee : 50.00 21344. Balance, Analytical, Troemner No. 65, exactly the same as No. 50 but with beam divided on both sides of the central knife edge instead of on the right-hand side only as in the No. 50, and with black polished plate glass base inside of the case...... Se f _. 65.00 UR Fie Tea hi Om sMaaeA iS) Cc Oy 3Me TRA N > Zz = = r< RUEPRECHT PRECISION AND ANALYTICAL“ BALANCES As supplied by us to laboratories in leading institutions throughout the United States for the highest grade of research work. No 21360 No. 21368 21360. Balance, Precision, Rueprecht, a balance of great precision and large carrying capacity, constructed upon the well-known Rueprecht system, with all moving parts heavily gold plated, in mahogany case. @apacitivs grams aren ses secre ier Cece kre ace d 600 1000 2000 5000 Sensibility, milligrams...... cottaeeneaiacls oO Pll 0.1 0.2 0.5 Duty Hreewnevs.- -- Ba aciet eee 0:0 OMe 48200) 330.75 427.25 Duty Paid..... : : ne .. 305.25 343.50 458.00 591.50 21364. Balance, Precision, Rueprecht, as above, with automatic device for removing and placing weights on the right-hand beam and with arrangement for variable sensibility. Capacity, grams...... : aOR 200 600 1000 2000 Sensibility, milligrams. ... : se Wey Oi 0.1 OFZ Dutyehreesst4--cr ass ; 215.00 344.50 385.85 496.10 1 Dita it:1 Ci Aad es aroD cdo} see aes bp Benen ies ie ... 300.00 477.00 534.25 686.85 Note—The above Balances can be furnished in case constructed entirely of brass and mirror plate glass at an advance of approximately 20% 21368. Balance, Analytical, Rueprecht, in fine mahogany case, with beam 200 mm long; 200 grams capacity. Sensibility, milligrams.... way ; 0.1 Duty Frees... =... Penne ; Re RS RA ar tcc 124.05 132.30 Duty Raids vs. seer ; s Abra Ae ai ee 171.75 183.15 21272. Balance, Analytical, Rueprecht, as above, but with shorter beam, i.e., 150 mm long; 200 grams capacity. Sensibility, milligrams.... 0.1 0. Duty Free... Bos BS RGY 21 eRe oe ae ee ee 124.05 132.30 DutysPaiditncs ashok peel os AB eee Resco ndiatoddcoaccc. 171.75 183.15 Note—Hither of be above Bz sees can be furnished in case composed entirely of brass and mirror plate glass at an extra cost of $35.85 duty free and $49.60 duty paid. 50 Qe rT es eat = = No. 21376 21376. Balance, Technical-Analytical, Staudinger, a convenient balance for quick and exact weighings on the lecture table and for students’ work. With beam and hangers of magnalium and agate bearings and knife edges. Case is of mahogany with sliding front door and base is of black marble. Capacity, grams....... 100 200 500 1000 ¢ < 2 3 Sensibility, milligrams. ... 0.5 1 2 3 Dutyehree!.55...2 2+ Me aoe : : oda 32.95 39.70 44.70 35.20 39.50 47.65 53.65 DULG YM AIP epee ee eee om Na ee et 21380. ‘ CLA LAAT LALA ALAM ON ©) 3 2. ST ie Tm Mt i LL Le a wi | iid Rani Cy PBENSIAN AAAS SS | | WA LA i inwui a ln No. 21384 No. 21388 21384. Balance, Assay, Ainsworth Inverted Type V, a reliable and widely used Assay Balance. Sensibility—adjusted to a sensibility of 1-500 milligram and afterwards reduced to 1-200 milligram to increase the rapidity. Case—of mahogany with counterpoised sliding door, 17 x 17 x 10 inches. Beam—of hard rolled magnalium, 5 inches long. Edges and Bearings—the end bearings are fla ate planes with suitable recesses for the engagement of agate contact points by means of which the bearings are from the edges when at rest. Rider Carrier—of improved design with no metal surfaces in sliding contact and will operate smoothly and without lubri- cation under all conditions. Tne graduated seales divided in hundredths, each division representing 1-100 the weight of the rider used, are attached to the carrier. The rider carrier rod has a slight amount of end play in the sliding bush- ing which permits the withdrawal of the carrier from the eye of the rider without disturbing the reading, a greatly simplified construction. Release—operates rapidly without causing the beam to kick, this being accomplished by first releasing the pan rests, then the end bearings and finally the beam, by means of a very simple mechanism not liable to derangement and which over- comes a serious defect in earlier balances of this type. Finish—all metal parts are heavily gold plated and Jaecquered. wrote o dystetay plas vet avereaue sie Geacatele seks at aie eenen eh ieee a 300.00 21388. Balance, Assay, Ainsworth Type CG vith Improved Multiple Rider Carrier. As used by leading assay- ers, smelters and mills where a large number of accurate weighings are to be made. The carrier can be attached to any of the other Ainsworth Balances. Each weight or rider has an indi- vidual arm, cannot be misplaced and can be operated with beam in motion. The numbers on the arms down indicate the weight of the riders on the beam and, when through weighing, all riders are reset simultaneously by a reverse movement of the thumbpiece. Sensibility—adjusted to a sensibility of 1-500 milligram and afterwards reduced to 1-200 milligram to increase the rapidity. Case—of mahogany with counterpoised sliding door, 20 x 17 x 10 inches. Beam—of truss form, with star adjustment, unobstructed on top, divided in 50 parts on either side of the center and read from 0 to the full weight of the rider used. Rider Carrier—similar in construction to inverted type, No, 21384. Finish—all metal parts are heavily gold plated. LALLA NAAT ul IY s uh il mc mi HN Hh No. 21392 No. 21396 A Ree ok Ht PU OR Jel We gH On gM: fA oS Gy 0; 9M PR Aw aN: -Y 21392. Balance, Assay, Troemner’s New Form, No. 30. This is anentirely new Balance designed to meet the demand for a low priced, short arm Balance with a sensibility of ;}, milligram and of quick action. It requires but 13 seconds for one complete oscillation. Sensibility—1-100 milligram. Case—of well seasoned mahogany, French polished, with glass sides and top and with black plate glass sub-base; fitted with counterpoised sliding door and provided with a reading glass for the ivory index. 18 x 9} x 18 inches. Beam—of hard rolled aluminum alloy, graduated on both sides of the center knife edge into 50 divisions. The beam is un- obstructed on top, so that the rider ean be placed at any division on the beam, from 0 at the center to the last division on the beam, which is directly over the end knife-edge and represents the full weight of the rider used. With a 1 mg.-rider on the one-half divisions, or a } mg. rider on the full divisions the Balance shows 1-100 mg. for each di- vision on the ivory index. Edges and Bearings—of Russian agate—accurately ground. Rider Carrier—of single, double hook pattern, operated from right hand side of case with full, clear sweep across beam, and the rider, either single or double, can be placed at any division on the beam. Finish—all the bras parts are covered with an impervious juer. 21396. Balance, Assay, Staudinger No. 22b. This instrument is devised specially to meet the requirements of students’ assay work in the U. S. at a low price. A large number of these instruments are now in use in this country, and no other balance of similar specifications is offered at a corre- sponding price. Capacity rams. Sensibility—1-50 mg. but will easily show 1-100 mg. Case—of mahogany. Beam—of magnalium, 200 mm long. Knife Edges and Planes—of agate throughout. Release and Arrest—the arrestment of beam hangers and pans is accomplished quickly and conveniently. Duty Free 36.00 Stockes..6-. : Soe A Goa She 50.00 No. 21400 No. 21404 21400. Balance, Assay, Pocket. Improved form with eccentric lift for beam. Size when closed is 6 x 2¢ x 14 inches. Capacity 10 grams; sensibility { mg. Complete with set of weights. A half assay ton weight is usually supplied in place of the 10 gram piece......................-. sisis,creere) OO 21404. Balance, Micro, Nernst. This Balance is based upon the torsion of a very fine quartz fibre and is used for weighing small crystals and for carrying on micro- chemical reactions with accurate observation of change in weight. The Balance is mounted securely and by means of proper arresting device may be shipped with reasonable safety. Full instructions for operation accompany each Balance. Capacity 10 mg; sensibility 4,5 mg. See Berichte der D. Chem. Gesellsch. Jahrg. XXXVI Heft 10 und Jahrg. XXXVIII Heft 1. Duty Free......... eh coors 37.95 Duty Paid...... ; Scho Dan a as 43.70 21408. Reading Microscope, Emich, for use with above Nernst Balance, on adjustable stand, with counterpoise for the Microscope. See Emich, Lehrbuch der Mikre- chemie, Wiesbaden 1911. ID Lee eS ee A RON Honea eT Ors ao PAL Duty: Paid as 2c sesce neces on oes sale eee eee 28.60 No. 21408 or us) No. 21412 21412. Balance, Lecture Table, Staudinger, designed particularly for experiments where large carrying capacity is required; capacity 5000 grams, sensibility 1 centigram. Beam is divided into 100 equal divisions with zero at the left-hand side so that a 50 centigram platinum rider may be used with a value of 100 centigrams at the right-hand end of the beam. Beam is of bronze with agate bearings and planes, on heavy mahogany base; with levelling screws. Duty Bree scone ec eee 5.00 Duty. Paids, :...\....0)s¢5ee eee 105.00 21416. Balance, Lecture Table, as above, but Sh covering case of glass and mahogany. Duty Pree. 2 tae se cece 105.00 Duty Paids.e2 5.2... ee 147.00 21420. Balance, Decimal, Mach, specially con- structed for weighing precise quantities of substances for an- alysis, particularly in sugar, ferti- lizer and brewery laboratory prac- tice or other work where large numbers of consecutive weighings of equal charges are to be made. The usual method is to use a scoop, counterpoised on the scale pan with lead shot placed in the circular box under the hangers at the short arm of the beam. If 20 grams of a substance is to be weighed, a 200 gram weight is placed in the rear of the short arm pan and the scoop on the front scale pan charged until the pointer comes to zero. Capacity 100 grams, sensibility 1° of scale = 1 milligram. Balance is furnished in mahogany case with metal parts heavily nickelled, suitable for use in the tropics and with base plate of polished mirror plate glass. Duty: Free: 3... sone 25.90 Duty Paids2. cence eee 34.50 21424. Balance, Decimal, Mach, as above but with pointer at the left-hand side instead of in front, and with side doors. Duty Pree... cssceecseeee 27.40 Duty Paid...= -.:..-eeeeeeee 36.50 No. 21420 54 > v) =) ap (S eo) ae =] HeyOPeeMy SAS 5S CRO eeM. SP FAS EN < 21428. Balance, Lecture Table, for weighing large flasks and other containers and also for lecture table use; with adjusting arrangement for end knife edges; beam is of aluminum and support black enam- elled. It should be noticed that this balance is frequently offered with an iron beam, in which case the sensibility is greatly diminished. (Ceyenrtiinn, Jie Soeur benbenn ce oben pdRseaaesunenssepasone oes ouud 1 5 10 Sensibility, mg........ Vid oan e Re aren cseon iat aun ould 10 30 50 Duty Brees esas) Be cate Setp masta sr rsteteye Sudo a seen Succi Re DREN creer TE 18.00 28.50 36.90 - Duty Raiden Lee eee Ro dorgapncnne aoedsecsassors dnios so cone 21.60 34.25 44.30 21432. Balance, Lecture Table, same as No. 21428 but in glass case with oak frame. (Cnyenioiny, Melleshe-c 35cesc0c0 7c acca Reneoob Aree saeos6 salsmdciosGocor : 1 5 10 Sensibility, mg.......... et Es teoe ateccPAedsval crs wh tiga t are eae ene 10 30 50 Duty Free......./.. 1. ees See 5 oe ook ek 28.50 43.80 56.10 Dutyybaidese sss ek ee Ratna se SS Re ot De EER 34.25 52.60 67.35 21436. Balance, Laboratory, for school and lecture table work, with black enamelled iron base and pillar, with damping device for quick arrestment. The beam is of brass heavily nickel plated and divided into 100 parts and carrying a rider weighing up to 10 grams without weights. The bearings and knife edges are of hard high grade steel and the balance is supplied with levelling screws. Capacity 2 kilos, height of bows 35 em, diameter of pans 14 em, length of beam 32 em, sensibility 20 milligram. Dutyihree ssc sec yisacken sete 9.00 Stock . ee ee tad abc ona Hoe 12.50 21440. Balance, as above, but with agate knife edges. Dutyjbrees. oe. 2ce eer oe E . 12.50 Stocker nee waxes .... 16.50 No. 21436 No. 21444 No. 21448 21444. Balance, Pulp, for sugar, ore, pulp, ete., smaller sizes widely used as prescription sc ales, arresting device extends to hangers, knife edges and planes are of steel, on polished mahogany base with drawer and levelling screws. A very satisfactory and widely used balance. Capacity, grams..... 355 Ses PARE cot one 75 180 300 600 1500 Sensibility, milligrams. : daa V8 1 1 2 2 10 Diameter of pans, mm....... Heart 65 80 100 125 150 Bach.) .c22 ere eee 5 aA ae e200, 16.00 20.00 26.50 33.00 21448. Balance, Pulp, same as above in mahogany case, with sliding glass door. Capacityweramsiyerece en 1 eee Seo 75 180 300 600 1500 | DEY Uk setalenerd chemo oe eo ee Bar errant REE Re I IS 22.00 25.00 33.00 38.00 50.00 Capacity eramsh cris ssesctes etic oil. one acer epely os: cee a eee eee a ee 100 250 Nensibilitypmilligrams sco. essere 2s ee eee eee Coe ee eee Le 2 Bachar naree eos acyotess ; Aneta nected o6be cess 22.50 26.50 21456. Balance, Pulp, exactly same as No. 21452, but with marble top on the mahogany base. Capacity, grams..... : : : : PE asco: ee 250 500 Each....... oP. eee ; ie 20.00 22.00 No. 21460 No. 21464 21460. Balance, School Laboratory, with open beam, agate knife edges and planes, arrest for both beam and hangers, levelling screws and plumb bob, with divisions on beam for use of rider. Gapacitiy crams cy wri tierce cictlo csi on kone One eee 100 250 Sensibility, millioramss:teeeec mea eenet cos eltane ks co ek hee eee ee 2 3 1D) TR AA) Oh eC Weer cieerceiraci ia bio ROS e Cs Moers eee ier Serre | ee 10.00 12.00 Stocker. -: sAirsnapas = bos tere ge nee eee 15.00 16.50 21464. Balance, Staudinger School, with agate knife edges and planes, improved beam and hanger arresting DutysHreey cee Rats SOS SIS Waaonseseconc on for) 100 250 1 2 Seri oa = bangle tence aren ae aeeele 12.00 13.50 alelerarsser « ee 5 : .. 16.00 17.50 21468. > 21476. 21480. 21484. 21488. No. 21468 Balances, Magnalium. Many so-called magnalium balances have only the beam, pillar and pans made of magnalium, the remaining parts being of brass. On this account they do not resist acid fumes much better than ordinary balances. These balances are made entirely of mag- nalium insofar as the metal parts are concerned. With agate knife edges and planes. Capacity, grams..... : Mane . 100 250 Sensibility, milligrams.... 3 5 Duty Free...... : ae . ne. 10.00 12.50 Stocks.5----- = : E 13.25 14.50 Balance, Magnalium, same as above but in glass and magnalium case, and with rider carrier. Capacity, grams 100 250 Duty Free Bey tene aa chest Sinha s ecwuagts SEE Geos lO 27.90 EOE eee ae rie aeereite iia Sake O eieewias do abSIS ox dhafera oteyaimiane lois aforonet Steaks : 34.80 37.20 —— = Tl Balance, Laboratory, for general laboratory work, open beam fitted with adjusting screws at both ends The pans are 75 mm in diameter and nickel plated. Case is of polished mahogany with glass sides and top, sliding door, levelling screws and spirit level. Capacity 100 grams, sensitive to 3 mg 25.00 No. 21476 No. 21484 No. 21488 Balance, Laboratory, same as No. 21476 but with agate bearings 30.00 Balance, Prescription, of brass with nickel plated pans 3 inches in diameter. Beam 9 inches long with adjusting screws. Sensibility 2 mg 9.00 Balance, Prescription, of brass, on wooden base, with drawer. Beam 6 inches long, pans 3 inches in diam- eter. Without adjusting screws at end of beam. A useful Balance at a low price. 6.00 SRR OMNTUUNN WA NAAT No. 21492 No. 21496 No. 21500 21492. Balance, Jolly Spiral Spring, with new patent reading scale. The inner tube can be adjusted up or down by means of the milled head and is graduated in millimeters with vernier reading to yy mm. This Balance has been found very convenient in many industrial laboratories, such as in rubber, works; for taking/specific gravities..-.5.....-ces-sne ere oe rene eee eee 25.00 21496. Balance, Specific Gravity, Sartorius, for both liquids and solids. This Balance is much superior to balances of the same type made by other manufacturers. The outfit includes Reimann’s Plum- met for liquids, pan for solid bodies, jar, special thermometer and rider weights reading to the fourth decimal place. DutysEreesnee ose eerie ees Stock... <5-0:2%,.c;500 ees ee 30.00 Special Thermometer, only....................--.-- WEEE RES TG GGcc cacscos soc 3.00 SetiofRiders;conlypaccerreceeeeesen ees aee ase: wenn Sharon de qidiey Gite ORR 1.50 Jar, only.. weensee 9) jean den pele 30 Reimann’s Plummet, with thermometer............--- OF Wilke eile the be se oe 75 21500. Balance, Specific Gravity, Westphal. For the determination of the specific gravity of liquids up to the fourth decimal place. With jar, riders and Reimann’s Plummet...................... 12.00 Reimann’s Plummet, only ...._.. RR re rian. soho cos 22 2.00 Jar, only........ : aGusless ah bone ae ee -30 No. 21504 No. 21508 21504. Balance, Triple Beam, capacity 111 grams with a sensibility of 3 centigram. One beam reads from 10 grams to 100 grams in divisions of 10 grams, the second from 1 gram to 10 grams in divisions of 1 gram and the third from 1 gram to 1 gram in divisions of 1 centigram. Duty Free........ 11.50 Stock... 0.2...) nce an, eee 15.00 21508. Balance, Hand, with polished brass beam, steel knife edges, horn pans and silk cord. Length of beam, mm....... Saceyeince stony eee 150 175 200 Diameter of pans, mm : 60 75 90 EBach....... Paes 1.50 1.75 2.00 or oO 21520. 21524. 21544. No. 21520 . fy No. 21532 No. 21540 Balance, Harvard Trip, with square or round porce ‘lain plates 6 inches in diameter. Capacity 1 kilo, beam graduated up to 5 grams in {5 grams......./.. $ 6.00 Balance, Robervahl, for coarse weighing, with metal base and brass pans but without side beam. Capacity, kilos... aA os ate SoCo CROCE ; 1 5 5 10 Diameterioh ans} WIM. Aerts efeitos cieis : 125 150 200 225 OP leat et eruen SoacR pe ener nee coma a aeeae 2.80 3.60 4.50 6.00 Balance, Counter, in 1 ebony box with marble top and ‘heavily nickel plated pans: Diameter of pans, inches.. Capacity, lbs. . Beta ee isc : : 10 15 20 Each..... : soeo j 14.00 16.00 18.00 Balance, Troemner Trip. A very substantial and reliable scale >, with one heavy, brass pan which is removable. Ornamented in black and gold. Diameter of pans, inches.... : S 9 12 Capacity, lbs Be ents ens 2 6 AO. Each.. 6.00 7.00 8.00 Balance, Prescription. Very convenient in laboratory and pharmaceutical work. Pans 6 inches in diameter, heavily nickel plated. Capacity 500 grams in each pan, sensitive to 5 centigrams. Price includes full set of weights from 200 grams to 1 centigram, neatly fitted in base 10.00 Balance, Moisture, for determining the percentage of moisture in ores, etc. Beam is divided on the top into ounces and on the bottom into percentage of 100 to 0. Including a set of iron weights fRLOM Op SML Ol + eOZ. CAV OICUPOISe. car soe sinshices Gee eee On eer eee x 10.00 Balance, Solution. With two weighing beams and sliding poises, one divided into 100 parts, each representing 1 gram; the other into 10 parts, each representing 100 grams. A bar with a sliding poise is placed under the weighing beams to balance the empty bottle or container, which is quicklysdone byzslidingsthe: poisealong theibar.... +26. ceseneesie: sence Seneca: ..-- 25.00 Balance, New Dispensing. “Very convenient for rough prescription work or laboratory weighing. Pans 3% inches in diameter, heavily nickel plated. Beam divided into decigrams. Capacity 100 grams. Including set of brass weights from 50 grams to 1 centigram, fitted into base. 9.00 Ay gR ai EIS aU SR H. tHe Oy, Mea ES G © 4M” [Rea eine ey No. 21576 21548. Balance, Torsion, with glass case i and cover and slide beam with rider carrier operating from outside Capacity 125 grams n each pan, with beam reading to 500 milligrams by 5 milligrams; pans 7.5 cmyiny diameter sensibility. 1 milligram’. )-)>.. 22°92. ose ee eee 40.00 21552. Hydrostatic Attachment, Co.40 eS Meee ese ne rtd omen rach toons soos eceess: 10.00 21556. Balance, Torsion, with mechanism entire ly ‘enclosed in gl: ass case with German silver corner posts and nickel plated base; nickel plated brass pans 23 em in diameter. Capacity 4.5 kilos in each pan, beam reads to 100 grams by 1 gram, sensibility | gram. Rider on beam is manipulated from outgide the case. With slide beam inside the case controlled by weight mover from the out- SLOG 2 seers sirsa = as evapemannts cheeses) wesbales etaloners Aces a etoile avs ie cc Oe PNere eter ORE 35.00 21564. Balance, Torsion, with 9 inch beam and 6 inch nickel plated pans. Capacity 5 kilos. Beam divided to 300 grams in 23 gram divisions. Sensitive to about 1 gram...................-------: 13.50 21568. Arresting Devicesjexttalcs see se secs tees «kn Dolce eee 2.00 21572. Balance, Torsion, with tare weight. Bottles, dishes or other containers can be tared by sliding tare weight on upper beam, facilitating weighing and avoiding errors. Capacity 2.3 kilos in each pan, slide beam 100 grams by 1 gram, sensibility 7 centigrams, with nickel plated brass pans 15 em diameter; with arresting device (aleve \iseveusiasy. omega ornis. gM tikes akin Gieote ye ee 20. 00 21576. Balance, Torsion, similar to No. 21572 but of larger capacity, 1. e 4.5 kilos in each pan with a sensi- bility of 15 centigrams; pans 23 cm in diameter; with aides beam divided into 450 grams by 5 grams ;with: arresting: devices 2:5.ls, toads deee testes donc cee eae. she eee eee 22.00 21578. Balance, Solution, Metric. For rapidly making accurate reagents or other kind of composite solu- tions, with two movable brass pans. Price includes we ights of solid brass. With side beam in front, undivided, for balancing the bottle or containers. Capacity; kilos: 3: sane s beeen eee ea ean en a eee eee 1 5 Diameter of pans, TTUGHOS : sys.s Sevan ener orrep crea car eee IPT een or eee ere orci ie arn ceed RR 53 ye Bach. oes 50 ., Boe con. cic yp ee ee eee eeiteae Meee bare er a sees eee eet 16.00 20.00 60 21580. 21584. (700 No. 21580 No. 21584 Balance, Torsion, as recommended for soil analysis and as used in the U. 8. Department of Agriculture. With slide beam divided in 10 grams by ;!; gram; capacity 1 kilo in each pan; sensibility 7 centi- grams; with porcelain plates 15 em in diameter, high poise, indicator and arrest .......... 18.00 Balance, Torsion, for moisture or subtraction tests. ‘he scale is constructed with percentage beams so that 0.1% to 30% of moisture can be determined without calculation when 10 gram samples are used. By means of two tare beams one or more dishes can be balanced and recorded. As used in butter testing, paint and varnish testing laboratories, ete. With 10 gram weight.. 15.00 View in Stock Room Showing Arrangement of Porcelain Evaporating Dishes 61 > IR nl Wh dk H. esr JOD Maer Ay aS C) ROM RS ASN < ANALYTICAL WEIGHTS One piece Weights of Tobin bronze, made according to the designs of the Bureau of Standards, for use as Primary Standards, guaranteed to be witbin the tolerances established by the Bureau for Class A (new class M) are quoted upon application. Certificates for Analytical Weights of German manufacture such as No. 21600 are furnished from the Kaiserlichen Normal-EFichungs- Kommission of Berlin, as a matter of convenience. 21600. 21604. 21614. 21616. 21620. 21624. No. 21600 Ne. 21612 Balance Weights, Analytical, with gram pieces heavily gold plated and with fractional pieces of plat- inum except the 1, 2 and 5 mg which are of aluminum and two 10 mg riders. In velvet lined, polished mahogany box, with ivory tipped forceps and fractional pieces covered by glass plate. These weights are adjusted with sufficient accuracy for the highest grade of analytical work. Sets, 1 milligram TOPLAS eee rere ce 20 50 100 200 500 1000 Dutyehreesperiset...c sc.-cocmesen oss. eS 8.00 9.50 12.15 15.00 18.50 Stock, DOTASOU scree say cistscrsece veo aioe 10.75 12.00 14.25 18.25 Balance Weights, Analytical W ith Certificate, exactly the same as No. 21600 but with certificate of the Kaiserlichen Normal-Eichungs-Kommission of Berlin. Sets, 1 milligram to grams........ : 20 50 100 200 500 1006 Duty Free, per set.......... ecncin cnt es 14.50 16.85 20.25 24.00 28.70 Stock, Perm Setens menses oe ee 22.15 26.00 Balance Weights, Analytical, exactly Bintan to No. 21600 but with brass pieces carefully lacquered instead of gold plated. This set avoids the high duty on platinum and gold plated articles under the Tariff Act of 1913. By many exper rienced laboratory workers the lacquered finish is con- sidered preferable to the gold plating. Sets wlemillioram’soseram saree ee eye eerteieaicte 50 __ 100 200 500 1000 Duty Free, per set. : Se RS nae ae 6.85 8.00 10.50 13.00 16.25 Stock, per set.......... 8.25 9.75 Balance Weights, Analrtical, Troemmer, in piney any block with removable cover, gram pieces care- fully lacquered and fractionals of platinum and aluminum. With three 5 mg riders. Fractional pieces have one entire edge turned into vertical position for convenient handling with forceps. Sets, 1 milligram to grams. OO CT OAS Ores Soe nS U SOD Doe Oec 50 100 ] EG (Un ae eee Rec Ga A See IA Rear os Ate coibeea i be A 19.00 21.00 Balance Weights, exactly as above but with Bureau of Standards Certifice ate sits 27.00 29.50 Balance Weights, Analytical, Becker’s Sons, Rotterdam, exactly similar in accuracy and finish to No. 21612 and mounted in similar case. This set can also be furnished with Bureau of Standards Certificate. With three 6 mg Soe. Sets, 1 milligram to grams.......... Aedes econ Hae yA tee 50 100 Duty Eree,periset:-----.-.4.. -5.- ae toate ore 3 8.50 9.60 Duty Raids pensetts. o.oo ose bates PRR ea se Ue 3 ; 4, 00 16.00 Balance Weights, Analyticale Fe enon nal sizes only. Same as fences supplied in sets No. 21600 and adjusted to the same accuracy, 1, 2, and 5 milligram pieces of aluminum, larger pieces of plati- num. Size Fe iad Gar wl S 5 milligrams 01.02 OB) ail 2.5 grams LOY (an Se Ane wc 10 -10 -10 25 .30 45 -60 25 TS Balance Weights, Analytical. Single pieces of brass, gold plated. Same accuracy as supplied in sets No. 21600. SIZ6y) STAINS eee see eee il 2 5 10 20 50 100 IDEVA Ng Smock Serres soe ae 40 45 -60 -70 -80 1.10 1.75 Note—Riders of convenient shape and size for all standard Analytical Balances will be sent with our Analytical Weights from stock if customer will please specify make and type of Balance in or- dering the Weights. No. 21628 21636. 21640. 21644. 21648. 21652. 21656. No. 21648 No. 21656 Balance Weights, Analytical, with gram pieces nickel plated and fractionals of German silver. A good set for students’ analytical work, the sets being accurately adjusted. In mahogany case 5 WIhEOnCe ps we Sets emi pram tOneTamMsineece see sees ae een oeraen ces 100 GTS CU rt ree ict ya area's axe Siavareueye Sie'e.0he aisierg ohare rake anaialeeveio tamtyeraralscd Mae Mat Ere tapas 5.00 6.50 Balance Weights, Standard, for sugar analysis. SIZE OTA Serta hynny char tercis nic ecco cmicre cucsere evel) the Miers « Rye ae Sree Reeke 18.024 26.048 52.096 LEYS Neo cheb ODOR ED FC] SOR IOL OG CRO IOIE ORICIO Cee IIe are ee orien Ret 80 50 1.00 Balance Weights, Standard, for sugar analysis, set of three same as No. 21602, in mahogany box with EG | SSRs Sia bce Ores Ns Fae Sis Pac. eee OI ESET Meta STH PP 8 RN ns Ory ha Rene Pa Rea Ee i 4.00 Balance Weights, Assay Ton. Accurately adjusted to the stands eal of 29.166 grams to the ton. Set PTO SA GO ran Are sect ee chet A imve ave tyeveravave-otecaelar ela etree talece Ree aaa Tosa le tane erat Beas eam ave seIne 6.00 WEIGHTS OF MEDIUM ACCURACY Balance Weights, of medium accuracy. Gram pieces are nickel plated, fractionals of aluminum, in polished box, with forceps. A very reliable set for ordinary laboratory routine. Sets, 1 milligram to grams............ 20 50. —s:100 200 500 1000 Perse teers tay aot eerste cnileietyere, 2000, 3.20 3.75 5.00 6.75 9.50 Balance Weights, of medium accuracy, of lacquered brass. A very useful set for laboratory work. Fractionals are of German silver. In polished case with lid and forceps. Sets, 100 milligrams to grams......... 20 50 100 200 500 1000 IAC EC Bak Sotenunemcnsusarcaomeedeseon 1.25 1.50 2.00 3.00 4.25 6.50 Balance Weights, of medium accuracy, Troemner make. In cherry block, weights all solid brass with small pieces of nickel. A very reliable and popular set. Sets, 1 centigram to grams.. saosege Zt 50 100 200 500 __ 1000 Late dons 6 od ees SaaS ee be OU maar ecen 1.10 1.25 1.75 2.50 4.00 6.50 Balance Weights, of medium accuracy, in polished block, without lid, and without fractionals or forceps. SiNigy Tl Pari (OPS choogannosedcaeic cobeaco0s 50 100 200 500 _—:1000 IEG? ECU OAs bi Se we ee seater ee ne Any ret -90 1.25 1.80 3.50 5.00 21660. 21664. 21680. 21684. 21688. 21692. 21696. 21700. No. 21664 No. 21668 No. 21676 j ance il No. 21684 No. 21696 No. 21704 No. 21712 Balance Weights, of brass in walnut box. These weights are roughly finished and are of ordinary accuracy but are very suitable for students’ work. __ : 3 Sets; /O}maullioramsstoworamsee. ccs cect csi cists 50 100 200 500 _ 1000 PROriS@th some rct cer inrs minted aatareiere cisvane eiaxe crnhsloveloye ocoleiane -90 1.25 1.80 3.00 4.75 Balance Weights, single fractional sizes only of aluminum. Same quality as weights in sets No. 21644. Sizesemilllicramsheseeae ee eerie ei 1 2 5 10 20 50 100 200 500 Bachteee cose ese Sfee? Bice aeeesiatersyatens 10 10 10 “15 18 18 18 -18 18 Balance Weights, of aluminum, fractionals only. Same quality as No. 21644 but in set of from 1 milli- gram to -5eram., In mahogany, box, with’ forcepsi.... = as. ees siecle eee 1.50 Balance Weights, single fractional sizes only, of aluminum, same quality as No. 21648. Sizesantllitonainsteemaceecte eee cereer 1 2 5 10 20 50 100 200 500 Ha chiteeeree eyesore eae ee -05 -05 -05 -05 05 -05 -05 -05 -05 Balance Weights, of iron, for coarse weighing. Sets pl Okeramshto lel Osis. ccc caren eee eae 1 2 5 10 POEs Cbicyaevessieroctsters sete si ciate veda eet Recah ee ay eh ee: ee 1.25 2.00 3.50 5.00 Balance Weights, Avoirdupois, of sealed iron, for coarse weighing. Sets atozmtoulbstscnenc-nrachice ce ee aie ee 1 2 4 7 Rerseteeeme es a vacr cnc seen Mee Eee 50 85 Wiles Ree Balance Weights, Avoirdupois, Troemner make, of nickel silver. Set from } 0z. to yl, 07Z........ 1.00 is . : a “concave, of aluminum. Set from 3 grain to 10 grains .40 Balance Cover, of rubber sheeting, to order to fit balances as per size which must be given with order. Affording a very convenient and satisfactory protection to the balances in the laboratory. . 3.00 Balance Riders, of aluminum, carefully adjusted. 5 1 Size}, milligrams:..)....2. 0 - : 2 5 6 10 12 LEXA | Gamccte do encanmnode ary sl 5) ee 5 15 15 15 15 Balance Riders, same as No. 21696 but of platinum. Size; milligrams ape. o Sates Lee es eee 6 10 12 Bacht..2ccnt ect pe eee ce eee eee eee 50 50 50 Note. In ordering Riders kindly specify make and type of Balance on which they are to be used and they will be sent of proper shape to fit beam without bending. Balance Pans, of glass, with handle. Diameter winchessas, heeeeee eee RM SAE Benn ce Balance Rests, of glass, for use under the levelling screws of balances. Hach................+-- -10 64 21720. 21724. 21728. 21732. 21736. 21740. 21744. 21748. 21752. 21756. 21760. 21764. 21768. No. 21756 TL mt No. 21744 No. 21748 Balloons, of collodion for collecting hydrogen and other gases. lihevat ils! wheel oes Baas ie ee Sci pameBn oo onee Saanaen enna acon es. bos 6 12 16 LOENG Us spon steae ao ding an ene ee aoc Bre Aan bar mera scarica cmec oa oF 50 -85 1.10 Barometer, Bunsen’s, tube only, graduated in Smale lersed 4-45 seep Ee Ue OP, Mates 3.00 if Same as No. AZO butiallediwathimercunyse re weer sare cite a crass 10.00 es Observatory, U.S. Weather Bureau pattern. Furnished with scale divided either to r0 inch and vernier reading to ;45 inch or graduated in suilneters and reading by vernier to ;); mm. Mounted on polished mahogany board with white g lass background to facilitate accurate read- raya, WAR Haseena Kh oe Mecsonenpoaacdon sp ooaenorea aa oo bo bed cm hee Cadnonc coAmMADH ar 37.50 Barometer, same as No. 21728 but without mahogany board...................-..... noe orl) ST Pes ua Seals’ with both millimeter and inch seales. On mahogany board.. ... 42.50 & CSS Sie SISSON TCC a bac’ cor ENE se Without mahogany board. 37.00 Barometer Tabesbenteawithubulbaclosedsatmonelend er seem. ee ate eres sonar) (CMe stratchtaclosedsat onesend.ta..: a-tseeG n= 6 -mieteriseretiee .. 35 Barometer, Aneroid, with open porcelain dial showing internal arrangement, 5 inches in diameter in TASS COSC Pe eR IN, oy SERS | ath, DES ola avec ancien rete peeps arte myer eye ete e eee 2 ean 8.00 Barometer, Aneroid, watch form for the pocket, 2} inches in diameter, in gilded metal mounting and morocco carrying case. Compensated for temperature and with revolving altitude scale Tead- rave 11@y R00) Te oe be needt Cons Se ORO DEORE EDEN Sao ONO Ab RoODRGnbUsceae st Da GODoU mac oq ate siouape CALE!) Barometer, same as No. 21756 but with revolving altitude scale reading to 16,000 ft............. 24.00 Barometer, Richard, Recording. Divisions of chart equal 1 mm of mercury. Each chart equals seven days of time. In metal and glass case, 18 x 12 x 11 cm. Mutyehreesnn ee mie ese ee oe 22.00 Stocks oceesencsinaar Seer eee eee BOL00. Charts, for use with above. Duty Free, per 100.. =. 2050 Stocky.is<3-ca004 haprmesises sees 3.25 Battery, Edison Primary. “These batteries, formerly known as Edison-Laland, are unequalled for closed circuit work. They have a mean w orking E. M. F. of .667 volts per cell. When working continuously it is not advisable to take over 1; amperes from the ‘‘BB” type, 23 amperes from the ‘“‘Q” type and 6 amperes from the “‘S’’ type. Darema en Ee LE Be nN eos 2 as cS “BB” Q” “gy Gizereinchesey niin ns cence ene eae cates aves Aine are arclete Mr ete 4x 73 54x82 52x13 Capacity; pamipere OUTS! -saeieeerye eiyareisiel sae eke) ee mee00 150 300 Complete in porcelain jar. . LOS OCD SeErierd Hoe artos cts fe 1.50 2.20 3.00 Complete menewal essere sree ee vets ate im otal ataie) states ererek-s Torre 12 82 1.46 The following is the itemized cost of the parts necessary for one charge i in renewing the batteries. (Cree OS eO IAEA - oages cosbee coduesoosnnenooepacnoesesne Gc 24 31 62 Ale lil bY Caisson Te Sneenie ene o Cement o cileree cractoragieys Gm aes re -28 28 -50 CHTATIRR IE). (oto. eee o sumectcndeean HEGES oan Acéeobnadanibsosadace 15 17 -28 PAT AAMUTLE s CLL rr rN ree 8 eres Sp elereie arsine Ye) slate aeoeies -05 -06 -06 21776. 21780. ™ 7) No. 21780 Battery, Grenet, original French make. Capacity. Mters:,.ctextsysis:srearace ceieteinieis aisle tore earner yeti oe aster + it 2 Complete sein nbo8s coerce a See Aeon ae ee eee eee 2.00 2.75 4.00 Carbon;sftor-renewal..s000e ne eee ee noon oe eee Cee 50 -80 .90 Zinc & ete trertce rt oe sil sbebstotais sodsasdooess: adedagsusen -20 25 -30 Battery, Dry, an open circuit battery of high efficiency, 7 x 23 inches....................0.....25. 25 Battery, Storage, Model of the Physikalisch-Technische Reichsanstalt, Type U. These cells are 52 x 30 x 80 mm high, with sealed in porcelain lid and arrangement to permit the outlet of gases through fine glass wool. The cells have an E. M. F. of 2 volts each and have a capacity of .8 ampere hours at the normal discharge rate of ;’5 ampere, or 2 ampere hours at a discharge rate of ;}) ampere. They are widely used for physical measurements, the testing of ammeters, volt- meters and other electrical measuring instruments, and have been found useful in many kinds of laboratory work where a great variation in E. M. F. is required. The cells are furnished singly for mounting in the laboratory or mounted up on base boards with connections, in batteries of from 10 to 100 cells; in portable cases, with switch board and lid, in batteries of 20 to 100 cells; and in portable cabinets in batteries of from 120 to 400 cells. Prices on application. Battery, ‘‘Chloride Accumulator,’’ Portable Type. Portable batteries are shipped filled with electrolyte and charged ready forservice. While the greatest care is used in packing, it is almost impossible to avoid damage to cells of this type shipped by freight. For short distances it is, therefore, recom- mended that shipment of the portable type be made by express. Where distance is great it is recommended that electrolyte be forwarded separately as in the case of regular batteries. Each cell when discharging gives approximately 2 volts and, as the cells in each case are connected in series, the number of cells erathiplied by 2 will give the approximate voltage between the two outside con- nectors of each case. The normal charge rate is the highest rate in amperes at which the battery should be charged. At this rate a battery will be fully charged in nine hours and discharged in eight hours. Number of cells in case.... 1 2 3 4 5 1 2 3 4 5 1 Type and No. of plates..... 3: ‘€3 “C3 '¢3 (G3) D3), D3) D3 D3ie Dames Normal charge rate, amp... ; + + 4 1; 23 23 23 24 23 5 Weight, pounds............. 8 14 20 26 32 15 26) 37% 48 59 24 Price, complete charged..... 5.00 9.00 12.50 16.00 19.00 6.50 12.00 16.59 21.00 25.00 10.00 Number of cells in case........... 2 3 4 5 1 2 3 4 5 1 Mypevand No: of, plates. -e-see D5 D5 D5 D5 D7 Dreebs Dt DiisH5S Normal charge rate, amp......... 5 5 5 5 (63 (E; 74 4 3 10 Weight spounds)-.ca-ee-n sneer 43 62 81 100 3358 83 108 1383 33% Price, complete charged. .......... 18.00 26.00 32.00 38.00 12.00 22.00 30.00 40.00 50.00 14.50 Number of cells in case........... 2 3 4 5 1 2 3 4 1 1 Type and No. of plates........... E5 E5 55 E55 4&7 i? 6K Cc EYSCC@.s sD Normal charge rate, amp......... 10 10 10 10 15 15 15 15 20 25 Weight poundsten-esecneriereiae 60 863 113; 140 42) 823 1223 163 44% 533 Price, complete charged......... . 28.00 40.00 50.00 60.90 18.00 35.00 50.00 60.00 21.00 25.00 66 “S48 C222 No. 21788. Type D7 No. 21788. Type C3 No. 21788. Type F11 Battery, ‘‘Chloride Accumulator,”’ the most widely used form of storage battery. The voltage of cells of all capacities is slightly over 2 volts on open circuit and, during discharge at the 8 hour rate, varies from that point at the beginning to 1.75 volts at the end. Electrolyte is shipped in carboys, for each of which a charge of $2.00 net is made and an extra charge of 5c for caps when required. Credit will be allowed in full for these carboys when returned in good condition and charges prepaid. The following net charges are made for casing and packing. eo mag randy bile + elements .eachs 9.0.0. Scans gee TE Eee Niger -02 a Cee ANE aC Ie pmCLOMEN US MEAC Lita are rks Saver ese sralede sate oreeevehe ee rr™ ORC t e i r eee -04 oD Pa Palye ands Bylo teleMmentsy CACh ice, ., cimrccccaarsaes aan a aCe Eee 10 poHipmelemcn Ga CaChy:«,.clnia hea trs syats Zz Ss No. 21796 A No. 21796 B No. 21796 C No. 21796 D & g & ANT.Co_ “Arico No. 21832 No. 21808-21812 Frac Wa \ Z if i i> me a No. 21816 No. 218: No. 21824 21792. +‘ Battery Binding Posts, of brass. Style................. A B Cc D E LORY yapoeoubeded oouUeRD OM nOUdoA snaAGsenconduoHQc -10 07 -10 -20 25 2179658 Battery Connectorse, Stylesqcasaen oe eae eee eee oe B LG D Pach cher ect i get che ae are rs eee cele 35 25 25 20 21800. Battery Jars, cylindrical, white glass, hand made. Diameter, inches........... i 45 4 5 6 9 9 Height, inches.............- 43 5 7 8 12 15 Number in original package 60 48 48 3 AS Lie 6 aches sit cena Ne ee eee 25 25 50 65 1.50 1.90 Per dozen, in original package saenceceiccssee ater 1.45 1.65 1.80 2.15 3.30 8.25 9.65 21804. Battery Jars, square form, with ground top. These are packed six dozen in a case. Men guhsiOCHES:.afeleisi-ss12 step latc erence iaiers atetaketeve ere) oleloe cee telelereee = 33 4 ZF 4 Width. inches. 33 4 43 4 Heig@hbeinehess <5: donne ccloms tow. ie cilsel a cclaeiniscicieitee 5 8 mo 4 JOE 1G Ge eciG EAT REO OR SIaT nos corer inc RAO rh Sarn om adeno aT .20 30 25 20 Peridozen; in original package: a... caselsas ae ceteccceaeie LeOD) 1.50 1.40 1.05 21808. Beakers, Aluminum, with spout. 16 apacity, Wovicasoooo a) 120 | 250 ——00 1000 IDE Ye Opie sBe ste ecient oe are cena aioe Cotman -30 50 -70 1.00 1.40 21812. Beakers, Copper, with spout. Capacity, cc. Omteonca al PAD 500 —__—«1000 2000 1 DEVO eeaaad ete eens ain ARC Omoe crs Ricrein he ooh ean ct Aa) 75 -90 1.20 3.00 21816. | Beakers, Enamel Ware, of seamless steel, white enamelled, both acid aad fire proof. Very convenient for many purposes in the laboratory and especially for culture tubes during incubation. Gapacttyaice-acceseenn sees eee PA en ee ZS eee 300 450 650 900 Heiehtammtrrp ttre pence rice < ee oe acne mee ater 90 100 110 120 Dismeter pMmM sae seeem crac oes chiebreraare ce nce te eee ee 75 = 1857 100 iQ Ch ecierecs istes cers soatetefoiers ictol= Biateisisseieeiecleisia.s -30 35 A5 55 21820. Beaker, Enamel Ware, of seamless steel, white enamelled, both acid and fire proof, with flat, well extended lip; 140 mm high by 70 mm inside diameter. Made especially for and widely used in theidyeing industry) Capacity 500\cc.-............).s2 cee eeen eeeeie eee ce neee eee aaa -50 21824. Beakers, Royal Berlin Porcelain, glazed inside and outside, without spout. Widely used in the testing of dye-stuffs, etc. Capacity, CON Se Maat ctemacrerats Bast toettmatectiene fecsteei= 340 580 800 970 1500 Bach Seok ie So idtteeere oO as ae easels ee seat -90 1.08 1.35 1.50 2.10 21828. Beakers, ‘‘Sanitats’’ Porcelain, glazed inside and outside, with spout. Capacity OC «feds ssyestotesvsierstare Giese atetareeate crelciers sic sient eral l/s eee tere eto 325 500 1000 LEY EES Aor ec eteU ocd cohort aoe cet nao oor SDA ORES ISG OM ade SE edomO 5 50 75 1.25 21832. Beaker, Royal Berlin Porcelain (Dye Pot), glazed on the inside entirely and on the outside down to the heavy ring for supporting same in water bath. Below the ring the beaker is unglazed; waeh- out lid; 165 mm high, 132 mm diameter at HOD; capacity 1460'cc: 8.0.2 3. 2 oa eee 2.70 21836. Lid, Royal Berlin Porcelain, for above beaker. . 6S 21840. 21844. 21848. 21856. No. 21852 NOTE—Our ‘‘Best Bohemian’”’ beakers Nos. 21840, 21844, 21860, 21864 and 21868 are offered as being the highest product of the Bohemian factories. They are selected after the most exhaustive chemical and physical tests made in Philadelphia under our own direction and are distinctly superior in shape, finish and resistance properties to German made beakers, with the exception of the products of Schott & Gen at Jena. We do not list or stock German beakers but can supply them on duty free orders at somewhat less price than our ‘‘Best Bohemian.” Beakers, Best Bohemian Glass, Griffin’s low form, with spout. used in both educational and industrial laboratories. : to shape and quality and are recommended as a most satisfactory beaker for routine work. 3 This is our standard beaker and widely They are selected with special care as Numbers. tacactasaciie aan: 0 1 2 4 @apactty eestor mciyscscemi 20 40 100 150 250 350 500 Rach aevree ance nmr 0 OS 10 12 15 .20 25 Numibencememmeenes 5 6 i 8 9 10 11 12 Capacity, ce....... 670 950 1250 1750 2400 3000 3750 4500 ach ®. ccc. hemes 35 45 ~5d 70 80 -95 1.10 1.30 Beakers, Best Bohemian Glass, Griffin’s low form, without spout. Otherwise same as above. NGM bersvertiae cris cin a: 00 00 0 1 2 3 & Capacitive cespennek.< oes oth. 20 40 100 150 250 350 500 Bach eers: cnet gees 07 -08 10 12 alls -20 25 Number adnan 5 6 ii 8 9 10 11 12 Capacity, ce....... 670 950 1250 1750 2400 3000 3750 4500 Machin. cence: 35 45 55 70 80 95 1.10 1.30 Beakers, New Jena Glass, Griffin’s low form, with spout. throughout the civilized world. | The standard beaker for analytical work @apacity (ccm teeeeee eeee eee 50 100 150 250 400 600 Bachemers Werte sci ioeccn ck 12 8} 15 17 wou 29 CHDAGHNG Co-ccajaccauscosouce S00 1000 1300 1500 * 2000 2500 3000 Bacher ey es Ae ed 39 47 53 60 68 78 Beakers, Whitall Tatum Nonsol Glass, Griffin’s low form, with spout. a) Very insoluble in water, acids and alkalies and especially recommended for their By special arrangement we offer these Beakers for immediate shipment ture change. uniformity of shape. from our own stock at manufacturer’s original net prices. 30 Extremely resistant to tempera- Capacity ecaene setae wee oes aes 60 90 120 150 —__—«180 1 OEY Ure aips ats SG cece en tan eR eines 4 12 13 14 15 15 (CRD IKON SC CoR names Aeelece tar _ 250 300 350 500 600 700 1000 Blachigene-Pi ones. tases sce 17 18 20 25 28 30 45 Beakers, Whitall Tatum Regular Glass, Griffin’s low form with spout; widely used in industrial labora- tories because of their uniform shape and high quality of the glass. By special arrangement we offer these Beakers for immediate shipment from our No. 21852. stock at manufacturers original net factory prices. 30 Exactly similar in shape to Capacity techs snes eee 60 90 120 150 180 250 300 LDEYH US crs SORE Obie bi te REO OR tae ehaee -09 -09 -10 ll Al 12 12 -14 WaNaelbyetCOn asthe cot eccr etiiei ae'sicie fetiao 350 500 600 700 1000 1400-2000 ] OF eye centres cite oR erate TE ISIOic ee ener ae 16 19 -20 rs} «35 43 55 69 21860. 21864. 21868. 21872. 21876. 21880. 21884. No. 21860 No. 21868 Beakers, Best Bohemian Glass, usual or Berzelius form, without spout. No. 21872 No. 21880 Same quality as No: 21840. iNumben eee eee seen 000 00 4 Capacity, ce 15 30 45 75 110 170 250 Bacher te onc eee rose 07 08 10 12 15 18 Number sseries see 5 6 7 8 9 10 11 12 @apacity,.cc.....-. 380 580 800 1150 1750 2250 2800 3700 Bachman ee eee cree .22 .28 35 ena) 55 65 15 .90 Beakers, Best Bohemian Glass, usual or Berzelius form, with spout. Same quality as No. 21840. ANfum betes ecmer= setae cies 000 00 1 2 3 4 CEiCACHIN, COsussodooneosodbes. 1G) 30 45 75 110 170 250 Bacher pe oscirs | acyicek 06 oa 08 -10 12 15 .18 ING Denese <= 5 6 uf 8 9 10 ll 12 Capacity, cc:...... 380 580 800 1150 1750 2250 2800 3700 Bachweereerny ore 22 28 nenreS 40 5D 65 75 90 Beakers, Best Bohemian Glass, extra tall form, without spout. Convenient for lecture table. Capacity cc. ...cs. 150 250 350 500 750 1200 1800-2400 Machiscansse se Sie [20 noo S05 Sime UR -60 Beakers, New zene a Glass, usual or Berzelius form, without spout. Capacity, 50 100 150 200 300 409 500 600 Bache ecceracee 012 Eeclae 15 Piven wr et 26 29 Capacity, cc........ 800 1000 1300 1500 2000 2500 3000 4000 Bacheeeseeren corer oo2 37 42 45 153 63 73 85 Beakers, New Jena Glass, usual or Berzelius form, with spout. Capacity; ce.-.-. 50 100 150 200 300 400 500 600 Machin. sonecereeete®: 12 13 15 a7 eee 24) 7) Been -29 Capacity, cc........ 800 1000 1300 1500 2000 2500 3000 4000 Each.. 32 37 42 45 w53 63 e723) 85 Beakers, W hitall ” Tatum Nonsol Glass, usual form, with spout. change. ‘formity of shape. Extremely resistant to temperature Very insoluble in water, acids and alkalies and especially recommended for their uni- By special arrangement we offer these Beakers for immediate shipment from our own pir at manufacturer’s original net prices. Capacity, Rae i ce OO 90 Bally Set cet sees otrees eee 12 13 Beakers, Whitall Tatum Regular Glass, tall form, changes. Very insoluble in water, uniformity of shape. from our own stock at manufacturer’s acids and with spout. 120 180 250 300 350 500 700 1000 14> 415 175) 1S) 0 Oe Extremely resistant to temperature alkalies and especially recommended for their By special arrangement we offer these beakers for immediate shipment original net prices. 3 60 Capacibysice’f- hee c pce oe eee eee 0 ( S020 180 250 LENG iene Set a gS BMS 2 oe ee oes -09 09 -10 ll 12 13 Capacity ances. sere so ceo eee 300 | 350 _ 500 700 ~~—«:1000 1200 Hach) e.cteibis rechiee e Ben e eee 14 -16 19 23 35 38 Te Hee. OMe AF-S Gc QO M PA N eRe oh oH WU OR H < No. 21888 No. 21892 No. 21900 No. 21904 No. 21912 21888. Beakers, New gene Glass, slender conical form, with spout. Wapacitiyceuincyst=1- =v: scene 50 100 150 250 500 750. 1000 LOG 05 Sono anoint Geer eee SO IE -13 15 17 26 34 38 21892. Beakers, New Jena Glass, wide conical form, without spout. z (Chiprvelinys eh oooaconpecnences 50 100 150 250 500 750 1000 Machennieare ar. oso on oc 12 13 15 7 26 34 38 21896. Beakers, Phillips, conical shape, without spout. Chskehiny, Cer scndoe been ee be oe eo snp dsooccomebenodor 100 _ 250 500 750 1000 OGL Soo ae RG Der 10 5 5 .30 40 21900. Beakers, Phillips, conical shape, with spout. j (CHARGING Cbssonsoe odacs Gbavabbcogepadaobu0cOO00GE 100 280 _500 750 1000 LOG Ne ..g nse peooenos GEE BL DAO SO JO nu ROD COnBnnSOCdo aan 18 22 -30 35 45 21904. Beakers, tumbler form, of heavy molded glass. Not intended to stand heat; capacity 7 oz... -10 21908. Beakers, Heavy Glass, low wide form with spout, convenient for many purposes for which the ordi- nary thin boiling beaker is not suitable. (Crying cbse come aneeas cos pocooan sa 100250 400 50:10 2000 Bache ee chee ec ee ei aaee att 20 Pal 35 50 60 85 21912. Beaker, Heavy Glass, with wide flaring lip and spout, as used in sugar analysis. pa (CRAGIN COrg-c1en0 a Guboh ey bosucaa JaesonDososaoogadesopesdere sacnndomdono> out 175 900 TDG! ti. isan Se che oe Boies bres br oeterctenat 4. A Rice Igoe Bucci ; : if ee -20 -40 No. 21916 No. 21920 No. 21924 No. 21928 No. 21932 21916. Bell Glass, of light blown glass, without flange. Very convenient for covering small objects. MiamMeter INCHES: scorer He << :s.5c5c.5 gates st cite CoC orerat ele Se eT «os sclele ciel aie as ereterelens 3} 4 Vero Gwin CHES Seync tees os SU pace cae, slat 0 age eterchnvavabeteosrade ete cneiens st, Suekeereys sts, = syeusyetste 3 2 LDEG eon don006050.0700 5G tS Bab PRESEMOD DEO OCCo SOO UR oTOCSnncpHonBo non eeode hanes 30 50 21920. Bell Glass, of heavy glass, with extra wide flange carefully ground for use as air pump receivers. eight samme eee oe ce. 80 105 130 180 200 220 260 Diameter, mm. ae eos. . 00 105 — 180-155 175 __220 260 BlachtQaanccnm en sctereeee nee ns: 60 u75 1.10 1.60 2.00 2.50 3.00 21924. Bell Glass, low form, with ee See Height, inches.. ccc EOE 13 24 3 4 43 5 6 8 1@) ala Diameter, inchoate cer mics te oS 4 5 Cie ae eS) a LOL) (oN SoS oo oem on deeerore 50 .60 elon 1.0025 eb O75 2. 00ND no: 00 21928. Bell Glass, low form, without flange. A very convenient shape for covering specimens, etc. 1S(a tly pst aos Gun Gisele doo o.deboodas Gabe doonored Hoco acterd 100 120 150 180 Dyamie ter pumice os eestor eer aero’. siecle aio ram elon aelee 200 240 300 400 LEG NS ieic cin. co seeondtrar ded ant an GcMAne Teed bo rs Gano RO aoe -60 1.50 2.25 4.00 21932. Bell Glass, with open top, with tubulature near bottom and with wide, well ground flange. Suitable for use as an air pump plate. [Situ i Tale se or seo epodee bosses otonUnsdeonsAd soap docdo0dodds 4000 polaeddo son D006 300 300 IDY ESI nat tliNe ees BOMB Ne 6 OF CORED Hee ce DO ROEOtS AO COCER Tc Ie a race ees art 3 150 200 TOPIC Cag ois Pi ce eraeibety GED ALO ga SOR aE IOI RTEIDEIGIED Onc 1cp cictae Siete o Cn eb e Eerie a Ee 3.00 4.00 i. Hr No. 21936 No. 21949 No. 21944 No. 21948 21936. 21940. 21944. Bell Glass, high form, with ground flange Weight inchess. cece cee 8 9 eal 15 15 15 17 18 18 18 Diameter, inches........... ae 5 6 63 7 8 83 83 9 93 10 Bache. eee Sees 60 80 1.00 1.00 1.25 1.50- 1.75 1.75 2.00 ~2:50) “5200 Bell Glass, high form, with more or less square top; suitable for covering microscopes, ete.; flange not ground. Height. amehess 22225 ccc ocr eee ic ee 13 15 17 20 Diameter, inches............. sree rhefereiereserloieremewtaGens Socace. © mS) > {0 11 LET Te eee a aaReniced aurea cok Gance sous danebobead Sood 2.40 3.50 6.00 8.50 Bell Glass, with open top, with ground flange and without stopper. Height, inches....... ee 6 8 9 1] 15 15 18 Diameter, inches. ne Shes 4 5 63 7 ; 83 10 aches soso Uiatdieies 70 -90 1.00 1.20 1.50 2.50 6.00 Bell Glass, with open top, same as No. 21944 but with ground in glass stopper. Heightsanches: = sees 6 8 9 11 15 15 18 Diameter, inches....... 3 4 i 6 7 __ & 10 Each 75 1.10 1.20 1.50 2.00 3.09 6.50 Bell Glass, double walled, with ground-in glass stopper. The jar may be filled with colored fluid act- ing as a ray filter for determining the effect of various rays on plant functions, ete. Heicht; mm:...--.- oh yearns Be one ee: ' 3 F 300 400 Diameter, mm.... SBE : 3 120 150 IDETE honnan Sess Eaernnchnnaaedoen mois ates eee oe - 6.00 7.00 21956. No. 21956 No. 21956 Binoculars, Bausch & Lomb-Zeiss Stereo, for nature study, ornithology, etc. The 6 X, 20mm objec- tive glass is recommended as a general purpose glass and for tourists’ and sportmen’s use the 8 X, 21 mm glass, is recommended. Price includes heavy leather carrying case. POWOR Eee ttar ere so « Rate = 6X 6 X 8 8 X 12 X 10 X Diameter of objectives, mm.... 2 esr 21 25 |) 300) Seon Hachte 22 ceekoe ces hecoons 40.00 60.00 40.00 50.00 70.00 75.00 21968. 21980. 21984. No. 21964 tory blast lamps and Size B will operate six. SICA See E CERO OS Cen ea ee EA ee oe ; Soy cee . A B Duty Ere: 5 5).c eases cratic eene TR Pra CE oboe Re OD ee oo Sener .. 18.00 30.00 VDA EE 3 ee Ber ecient cio oie cake een EET Neg eines Ses i, Lee i .. 21.60 36.00 Blowers, Foot Power. These blowers produce a powerful and continuous blast, the pressure of whic h may be increased by adding one or more rubber discs to the air reservoir. DiameterloraLrsresenvoin nc hess chic arr iere eeeeee eere 7k 9 11 DEY Wee Se RCte cro So oie ROSE Oe e Se uicees 5.00 7.00 11.50 Blowers, Foot Power. same as No. 21968 but mounted on legs. Diameter of air reservoir, inches 9 11 of the best Up-River Para and contains no other ingredients than the necessary sulphur for curing. Will last much longer than dises cut from ordinary rubber sheeting. Diameter in Cheshire tree ei ee er ac Gerace en eee Ur 9) iy | DEG) bara ein Sto Sees Ae ee oe cays SE I Oe TOO OCR noe 60 -90 1.25 INetsHorabovestiooteBlowerssmeeb aclariisec cnc er: eevee tees ie toe Oke TEER. tas rot estos ote eee 35 Blower, Crowell’s Positive Pressure. Will give blast of from 1 to 10 lbs. pressure to the square inch or may be used as a vacuum pump for exhausting of vacuum not exeeding 24 inches of mercury. This apparatus is most satisfactory in securing suction for laboratory filtrations, ete. There are no springs, gears. valves or unbalanced parts and the pump does not have to be reversed when changing from blast to suction. In ordering please state whether or not air reservoir is desired. =, Sa 3 5 fee (BE “ > BE | Bese | Seat [Rees 22 ae 225 86 Bge ge 1-A 20 6.9 600 + 4x1 24 +in. |10 x 63) $20.00 8.00 2-A 45 13 500 2 4x4 34 as 123x 63 26.00 8.00 3-A | 125 25.3 350 ; 6 x 23 90 iL Uy 22 x14 40.00 10.00 4-A 280, 40.5 250, 1 9x3 170 ile Phe} SANZ 50.00 10.00 5-A 460 53.2 200 13 10x3 225 Dr a 34 x20 75.00 18.00 6-A 690 79.8 200 2 12x4 320, ie Ee 38 x20 100.00 18.00 No. 21992 No. 22020 No. 21996 21988. Blowpipe, of brass. DSrayE(3] Sater, on Ee 2 a ee ub Sia SO el) 225 __ 250 300 ache nc> :ck eee ee are SER PE osc 205 -08 -09 10 21992. Blowpipe, of brass, with bulb. IDG yg 0 Ot Eee eRe cnn Goble tie OCG o4acoor Oud coo A OBNAOGRD 200 225 250 300 Each 22 21996. Blowpipe, Black, of j : 45 22000. etn ef of brass, with screwed on tip, and wooden mouth-piece....................... 50 22004. Mouth-piece for Blowpipes, of hard rubber, new form...................-----e cece cesccccccevece .40 22008. Se sé es PERKS SoodsosoneuscudsnsssoogUmogmoneadoS 22 df Sielseind spe ee 10 22012. Blowpipe, Plattner, with hard rubber mouth-piece but without platinum tip..................... 1.50 22016. Platinum Tips, detachable, to fit Plattner Blowpipe No. 22012 at prices depending upon the platinum market. 22020. Blowpipe, Berzelius form, of brass, extra fine finish, with hard rubber mouth-piece and platinum plate placed on'.end of jet: A very satisfactorysform’:s-00-eese4s- oro eet oe eee 2.00 22022. + Blowpipe, Charcoal, American, willow, of fine uniform grain, 4x 1x }4inches. Per dozen....._.. 50 22023. y uG of coarser grain than above, 44 x 1} x ?imches. Per dozen................. 25 ‘ SET OF i p PIPE APPA i i LON R4 TUs ; i Handbook of Blonpipe Analysis, ; No. 22024 22024. Blowpipe Set of Apparatus and Reagents, as designed by Prof. Butler of the Colorado School of Mines for use in the laboratory and in the field. Each piece is so arranged as to prevent any break- age; outside dimensions 113 x 6} x 2? inches. Complete including wet and dry fluxes and alcoholand: otl im lamps. Saco CO OA OH CO ORE AEN Ae DOC Ee aciae leronomes 15 18 -20 22132. Bottle, Dropping, same as No. 22128 but with rubber bulb. Capacity, ec........... SCH On SSE ae oat opppenoepenr cone be oncnceo soc 15) sO oe Machen en scone BE Soto ooe Onin cotton BEE ane CRS Matos aD Bde -19 a22 25 22136. Bottle, Dropping, same as No. 22128 but of amber glass. LOH oh: Kol hand Seana nee cnn eHeiccce GU GHRO Cee Coen coor aeenasum ae ccot o. 30 50 BAGH react sssort, eposelesskose t.sre echt elebes sieiths (Is eee TSG sievecnrs, ob) eisists Pieler eiciei ete Cheb eee 25 -30 22140. Bottle, Dropping, same as No. 22136 but with rubber bulb. GCapachtys (CO cssiare: crs rova sis trsmerners arc toe ete ocne elekeasie oberg Wels elas Sores Geen eee ee _ 30 50 DEVS Ibarinocdoocbocaooc0cuedDDGC0G0000 sis clalc eferereelelelstele/siaicieicle/ele/a\elefelsieteetesieiciee e eeeeae 30 35 22148. 22152. 22156. No lo bo NW bk 22184. 22188. No. 22148 No. 22156 - 22160 No. 22168 No. 22170 Bottle Dropping, TK patent with stopper arranged to deliver contents drop by drop or to hermetically seal the bottle. Capacity, ec Ee. ee Oe eG oro Dec CSOT: 15 30 50 100 ache csy ce es cyte sc etiat.onae Heide ae aes: SiS eS 20° -30 Bottle espe EE same as No. 2144 but with flat Stopper protecting the lip of the bottle from dust. @apaciiyaice:.:. 42.4... oe Soo) ale) 30 50 100 200 LDENG Oiterchcay chara lee ea ea eae Aree Soo ai ate mes) 35 .0~C~C*«“‘«‘«‘<‘SO Bottle Dropping, same as No. 29148 but of amber glass. (WapaAeliny Cerca Nath sorte Riaraie Pvacinere mremen aseie ats 15 30 50 100 200 Bacher nessa tei wr too cetera ee .28 .28 35 40050 Bottle Dropping, with ground in pipette stopper and glass cap ground on. Very suitable for highly volatile contents. Capacity, cc..:... eee SH ie eats, Cea rete Ay tea eek: _ 30 60 1 DENG 1. Beri aot eae ROLTO'C GERI CIRO oh Se Le Ct eR eet i Tae ; A5 -60 Bottle Dropping, Schuster, with ground glass stopper, capacity 30 cc...... : 5 es u ss e same as No. 22160 but without glass stopper.... SemseelO: Boule, Cobalt or Acid, with solid glass stopper and glass cap ground on. Capacitive cers -- bP tech Glam SA ORE Ee Cea aia aioe mee 15 25 50 LDS allee Sat See get els eater ile CORO ERy Meera? Aue Ss 30 35 40 Bottle, Immersion Oil, with loose fitting glass cap, with glass dropping rod fused to same 50 fi Y/ il i) I, weet 4 q TN i) ce i] Ml No. 22172 No. 22174 No. 22176 No. 22180 No. 22184 No. 22188 Bottle, Immersion Oil, New Form, with loose fitting metal cap and dropper. ‘The immersion oil is used in the inside receptacle only in small quantities at a time so that it is impossible to with- draw a large drop. The outer compartment is to be filled with benzole, xylol, alcohol, etc., for cleaning objectives and slides, having no connection with the inside or oil compartment 75 Bottle, Immersion Oil, Bausch & Lomb, with metallic cap.......... rank en!) Bottle, Immersion Oil, Mach, with metallic cap....... ssatocege cts 15 Bottles, Specimen, wide mouth, of flint glass, for cork panes rs Capacity, ounces......... ; Rae ae 13 2} 3s TRU OV TOG 2 dani, oy I, OS ce eee ee ee 50 DD 65 PLCs ELOSS epee ee rey tet eeicers isla ute iewier sl tattnies wan eae ee 3.90 4.40 5.15 Bottles, Specimen, extra wide mouth and very narrow shoulder, of best American flint glass, for cork stoppers. (GE SNONINYS COV Aaa sos ani sedet Oc.ae eee ne ae setae Bok cane 1g 3 4 6 Beridozen ete ere. eth | PORE Shel fc ce ware NORE TRO 60 65 BR RE Bottles, Specimen, with extra wide moan for cork stoppers. Of best white German glass. This series of bottles has been designed to meet the need of a more satisfactory bottle for specimens in pathological and histological laboratories, etc., and is superior in both shape and finish to the American bottle listed under No. 22184. @apacityetGsns onset ssn ice ee eat 15 eect) esi). 75 _—«i100 Orel eects ceria se cision isonet eles ve ersnnae el cuscamtarn ea -60 -65 75 85 1.00 IAG Pa pan ea sel imerteiocecen Ta GeO n CE Speier: 5.00 5.50 6.00 7.00 8.00 22208. ATA wan Wi, a No 22210 No. 22218 No. 22226 Bottles, Narrow Mouth, best American aint glass for cork stoppers. Capacity, ounces....... 3 4 6 8 10 12 16 32 64 Number in original case. 864 964 720 576 432-3860 288216 216 S144 96 Rersdozens se. eee: 35.40.50 ee 55 65 -70 85 -90 1.05 1.55 2.60 Per gross in original case 3.25 3.50 3.90 4.75 5.40 6.15 7.00 8.25 9.00 10.15 15.50 25.65 Bottles, Narrow Mouth, best American amber gage: for cork stoppers. Shape same as No. 22200. @apacityaouncess.-+ -)) see eenn eee 1 2 3 4 6 8 10 12 16 32 Number in original case.......... 864. 720 576 432 360 288 216 216 144 96 Bermdozen vance. nasa ee 235.0400" 950) 550 GSI 70M mesh nO OMIEOSmmnIecD: Per gross in original case.......... 3.50 3.90 4.75 5.40 6.15 7.00 8.25 9.00 10.15 15.50 Bottles, Narrow Mouth, best American green glass, for cork stoppers. G@apachtyieiy..06.0 «msn seine nse eae eea loz. 20z. 40z. 7 pt. 1pt. 1qt. 2qt. 1gal. 5 galt Number in original case.............. 864 720 4382 288 144 96 48 36 6 IRCTAGOZeN 4 pe Cee 335 40 -55 70 1.05 1.55 2.40 4.00 17.00 Per gross in original case............. 3.50 3.90 5.40 7.00 10.15 15.50 24.00 40.00 170.00 Bottles, Wide Mouth, best American flint glass, for cork stanpers: Cc apacity, OUNCESS ce Fa ee eee 1 2 83 4 6 Number in original case............... 864 864 720 57 432 360 ers doZeniny- cel is5.1 2 OP eee 35 40 40 50 -60 -65 Per gross in original case.............. 3.90 3.65 4.00 4.90 5.65 6.40 Capacity mouncessa.-- eee ace 8 12 16 24 32 64 Number in original case............... 288 216 144 120 96 48 CTC OZ CD rsync, Se cles 75 -95 1.10 1.45 1.50 2.65 Per gross in original case.............. 7.25 9.50 10.65 14.50 15.90 26.15 Bottles, Wide Mouth, best American amber gass, for cork stoppers. Shape same as No. 22210, Capacityarouncess...... 5. eee ae 1 PD 4 8 16 32 Number in original case............... 864 720 432 288 144 96 Reradozenerent enc cinco ons ttek 40 40 -60 M715 1.10 1.50 Per gross in original case.............. 3.65 4.00 5.65 7.25 10.65 15.90 Bottles, Wide Mouth, of green glass, for cork stoppers. @apacityeecmee tee ecere loz. 20z. 40z. 80z. 160z. 1qt. 2qt. lgal. 2 gal. “5S pall Number in original case.. 864 720 432 288 144 96 48 12 6 Rerdozenve rr cissccecisoe 36 40 -60 75 -1.10 1.60 2.50 4.10 12.80 18.35 Per gross in original case. 3.65 4.00 5.65 7.25 10.65 15.85 24.50 40.15 102.50 175.00 Bottles, Narrow Mouth, flint glass, with high ground mushroom glass stopper. This bottle has a fine, fire polished finish approaching shop furniture ware in appearance and is much superior to iron mould finish. Recommended specially for laboratory or other uses where a bottle of better ap- pearance is desired. Capaciives eee rennin cs eeee 1 oz. 202% 4 oz. 6 oz. 12 oz. 3 pt. Number in original case............... 144 72 72 72 72 Peridozens iene ota te oreo neins 1.00 1.25 1.50 1.65 1.90 1.75 Per dozen in original case............. -80 1.00 1.20 1.35 1.55 1.40 Capacity aed cetera eee Ree eee 1 pt. 1 qt. 3 gal. 1 gal. 2 gal. 3 gal. Number in original case............... 72 36 12 12 Cm 4 Reridozenty ere ccc). seer ae eel) 2.25 4.00 6.00 13.00 20.00 Per dozen in original case............. 1.60 1.80 3.20 4.80 10.40 16.00 Bottles, Wide Mouth, same quality, etc., as No. 22222. Capacity crack acme eee loz. 20z. 40z. ¢pt. 1pt. 1 qt. Z gal. Igal. 2 galt Number in original case............. 144 72 72 72 72 36 12 12 ReridozenSasccei cance ae eee 1.25 1.50 1.75 2.25 2.50 3.25 5.00 8.00 18.00 Per dozen in original case........... 1.00 1.20 1.40 1.80 2.00 2.60 4.00 6.40 14.40 22230. 22234. 22242. 22246. 22250. 22254. 22258. i | | | NI | il Anim) eA) ea No. 22230 No. 22234 No. 22238 No. 22246 No. 22250 No. 22258 Bottles, Narrow Mouth, with vertical glass stopper, of green glass, for acids. @apesertys cee cry tees av oars 3 pt. 1 pt. 1 qt. 3 gal. 1 gal. 2 gal. Number in original case.............. 144 _ 144 oc 48 361 (Reridozen et 35a es eats cee 2.00 2.50 3.40 5.60 7.60 16.00 Per gross in original case............. 20.00 25.00 34.00 56.00 76.00 160.00 Bottles, Narrow Mouth, of white glass with flat glass stopper. These bottles are of German make and are distinctly superior in both shape and finish to American bottles of corresponding price. They are turned in a wet wooden mould which imparts a high lustre to the outside surface. Particu- larly recommended for use as laboratory reagent bottles. Capacity iC xsemr cist denieleom ctosete 15 30 60 125 250 500 1000 2000 Number in original case......... 1800 1100 600 500 325 180 120 60 Bachan ee eeeeie -10 -10 12 15 18 20 35 45 Per 100 in original case.......... 8.40 8.40 9.80 10.85 15.40 19.60 28.00 38.50 Bottles, Narrow Mouth, of white glass, with vertical stopper. Same quality as No. 22234. Capacitysicenas-suece seen 15 30 60 125 250 500 1000 2000 4000 8000 Number in original case... 1800 1100 600 500 325-180 120 60 36_ 13 Bnchav vs) Te He CURR Hie tT .HOy Meat Ags GG” (Of MES Rs Al aNE a 22484. 22548. No. 22536 ‘09 /LH'¥ [i TOGULGU EUG & No. 22484 No. 22488 No. 22492 No. 22504 No. 22512 No. 22520 No. 22528 No. 22532 No. 22544 No. 22548 No. 22496 No. 22500 Brush, Test Tube, special, of stiff bristles, 1 inch in diameter, with tuft at end. As used in the labor- atories of the Johns Hopkins Medical School. Black bristles, 2 inches long, on heavy tinned wire; total length 13s sinches. - (726). cise - dee erinee = sete seer -cfe isin). eee 10 Brush, Test Tube, on brass wire, with bristle end. Total length 9 inches; length of bristle part 22 inchessdiameter of bristles 1}-inchess-=. .-....24e=-+ «= - D No. 22552 22552. 22556. 22560. 22564. 22568. 22572. 2580. 22584. No. 22556 No. 22560 No. 22564 No. 22568 No. 22572 No.22576 No. 22580 Burettes, with straight glass Blonsocks with side tube for refilling. CECI COE as aeec cb Ja cbeacco eb oncs come oot B ctsrsjerihS Pele ee oe : 25 50 100 GHEG TEN GILT Gt oe SE Te ne en RNIN Ce Rs . db ori ts IDES (eect aes Boa ae Mein endae hoc arene oe Garr som Mars S 1.50 2.00 2.65 Burettes,with glass stopcock set on at an angle. Capacity, ce. Be ees Heat terete eisdeytsssasreta eties 25 50 75 100 100 Kraduatcdhiniccaer sa Mik ete ea ere ts a An t To DEG Se beso me eee occ ORO Un acter aoe Ree Eanes 1.35 1.85 2.25 2.35 2.50 Burettes, with glass stopcock set on at an angle and side tube for refilling with glass stopcock in same Wanacrtiyaeeecrcrn toss wc Tetsren orst sek so cioeict sei syele ssi icisteseh eeuaniee ore 50 100 Graduated TOO CLOr: Si tk Ben cam tans Ble EINE a SARE arte pee a hy St Se FER err RI IL are qe t DOE (ie ota Bio-ol cath Ooi one Sia Mee ICICI ee Ee Ree Nene in ea 3.25 4.25 Burettes, for pinchcock, same shape as No. 22528 but with dark blue enamelled stripe on white back- ground for accurate reading of meniscus. See sectional illustration. @apaeltys.cess em eieccerrien ie eons cc Sep nek ae tee cs are ea one ow) 100 Gradusteduniccsncsrma tea. «cane eit eee iets a El Na hee se Sees ae ae LOG Nieg Seia SHO me SES ORO Be an eae Set an ean eaeMnunane Aboer anmngotocouGacs: 1.50 2.50 Burettes, same as No. 22564 but with straight glass stope ock. Capacity,ec. 25 50 100 Graduatediinicts-erer nase ae ace eens Bess aH peace ee ad ts ts 15 Bach ree. = os ncn: 2.00 2.50 3.50 Capacity, ce...:.....-- Bets 25 50 100 Graduatedhinte es saat ete sceltist ion Poe eee ee a aadaerer vi wa ot} LEO TS SeaG 6 necro a Se OG OO CODD EOE ee DUE ate anSGnnr earn cr 2.25 3.00 4.25 Burettes, for pinchcock, same shape as No. 22528 but with two sides white enamelled with transparent vertical stripe behind graduations for accurate reading of meniscus. See sectional illustration. Wapachkby eerie do ce eee oe ee teen w oa eine Beals (slater eieha sloletoe avacia 50 100 (Give has Mav ek ann ek See teen Aenea Sone Soa aera tis Aco é ia to Way ee ers ny toss sth ose Pee era aeS suites 1.50 2.50 Burettes, same as No. 22576 but with straight glass stope ock. "Capacity, (COsrneen aac 50 100 Graduated in tu Ue Ree ke ne ae : i 5 OAS oe vo ata LENG bebo acicnc tn ee ee G © Sie to Ge Ona cia aera ene cao oe 2.50 3.50 stripe on white Bae terounal ae accurate res Sadng as ‘in D564, Capacity, ce. ONS cic OMe ean tee lot ere: elt eyheee 25 50 100 Graduated in cc..... 5 ee. OE ee eet ee eM eras htc to i 10 LDV Ts ot Sec eS Aes, 0 er tee a UN pee reo IE 3.50 4.50 5.25 Burette Automatic Zero, Squibb’s s latest form filled by pressure from rubber bulb. All joints are ground air-tight and price is for the complete apparatus with bulbs, reservoir, clamp and burette; with dark blue enamelled stripe on white background for accurate reading. (CCE O A a (Harn on or BAe Sots een ee eno OR ISS ROO Monod «cis Ges Coo Gmetad ote 25 50 Graduated TINCT en aah Fr te ei eee ee 10 Co | DEE) eel SGC SD EARL c CS Dna o OM een rinrint coroner 6.00 7.50 22596. 22600. 22604. 22608. 22612. 22616. 22620. 22624. bo to > tw io) mw be tS wh wy S 22644. 22648. No. 22632 >) i D No. 22592 No. 22596 No. 22600 No. 22604 No. 22608 No. 22612 No. 22620 No. 22628 No. 22636 Burette Rose Automatic Adjustable (Patent applied for). For repeated delivery of definite quantities. Automatically delivers the quantity at which it is set and cannot overflow. The quantity to be delivered can be quickly changed. Specially recommended for nitrogen determinations by Kjeldahl method, fiber determinations, fat determinations in milk analysis by Babcock method, for lead acetate solution in sugar determinations, for solv ents in ore and soil laboratories and for the dispensing of nutrient solution and culture media in bacteriological laboratories. See Journal of the American Chemical Society, May, 1910. Measuring tubes 35 x 200 mm giving an approximate delivering capacity of 182 ce each 6.00 Burettes, Dispensing, wide form with glass stopcock. Gapacity, COs he ceca te cease ie sete Oinien eee Taek See Cae 250 500 1000 Graduated binvcer. i6.c5 cee see yee erei eee Merete oe ae ene 5 10 25 Bach Gir). ose a saci dac ere ee ate aC Ee EE Pee 3.00 3.50 4.00 Burette Saponification (Sapometer), Huggenberg. See Seifensiederzeitung 1903, S. 795.......... 7.00 Burette, Morse, for calibrating flasks, pipettes, burettes, etc., 500 cc....................-00---- 6.00 s s as above, 50i¢e.and 200(CC) wa. eooccces chins uis mo oe tiradlebneaita hide Dee Eee Eee 6.00 “e f § bObees Sieciand! 2Q°cOe., i bs cd wade cae en a Oe eee 6.00 Two-way Stopcock for use with above as shown in illustration of No. 22604...............- 3.00 Burette, Morse, 1 cc, for small quantities, with stopcock attached........................--5- 6.00 Burette Caps, of glass. Outside diameter of burette must be given in ordering. SRO GIO UTCTEES I CCic 4 ce = site cc eee ee eee ree Eee 25 50 100 | DEES TS ceca ee ade oe ne cena SHS Gs AR BB BE od FO 05 .08 10 Burette'Ploat;, Hrdmann 2.2. co. 6c cha ance scene soe so Bee ect eee Osi a 25 a3 “Volthardt, with glass points to prevent sticking to walls of burette.............. -40 3 $SP MB CUE 35 sisiecsessiciere aie sfecace 5. s:a1s tops bor storeteehancict sve slaralepotsioveln hs ETS noe eee eee 235 Burette Funnel. A small glass funnel convenient for use in filling burettes.................... -10 No. 22644 and 22648 Burette: Meniscus! Reader; Gockel? With glass plate........-...08. +...) 0s. oe see 75 ss se ss s§ Withoutiglass plate... 0 o2.2.0.. 222 oes, ee 60 88 ST] No. 22660 No. 22676 No. 22664 No. 22680 No. 22668 No. 22684 No. 22672 No. 22688 BURETTES, PRECISION, graduated by weighing at 20°C. in accordance with the specifications of the Physi- 22660. 22664. 22668. kalisch-Technische Reichsanstalt, i. e., with individual control number, time of outflow, all around graduations for the whole centimeters and semi-circular graduations for the fractions, ete. These burettes are offered with our unofficial factory certificate and also with the Physikalisch-Technische Reichs sanstalt certificate and control stamp, i. e., the official certificate of the German government. Precision Burettes with Unofficial Factory Certificate These certificates are made out in the factory in exact accordance with the methods prescribed by the Physikalisch-Technische Reichsanstalt and no burette is certified unless the error falls within the limit permitted by the Physikalisch-Technische Reichsanstalt. The data on these certificates may be used as a check where burettes are calibrated in the laboratory or with entire reliance upon the accuracy of the figures given. Burettes, Precision, with pinchcock, rubber tubing and glass tip, graduated in accordance with the requirements of the P. T. R. at 20° C and with unofficial factory certificate. Size eee carte eet ne PU ne Fee Ba 8s 25 ec in j>ths 50 ee in j>ths 100 ce in {>ths IDE 0G Gad ogotinsay ns seeded: GEER oOreE Ears 1.75 3.00 4.00 Burettes, Precision, with straight glass stopcock, graduated in accordance with the requirements of the P. T. R. at 20° C and with unofficial factory certificate. SYP cone Se UNAS ss DOSS Se Eee eee 25 ce in 7bths 50 ce in jhths 100 ce in }yths IDE Ob ea8 solace ofa oo eee ees eee 2.70 4.00 6.00 Burettes, Precision, with glass stopcock set on at an angle, graduated in accordance with the require- ments of the P. T. R. at 20° C and with unofficial factory certificate. Sots Ad Shas on eee See TEE Be OE Eee COME Ones 50 ce in #yths 100 ce in yoths Bieter PO ch hed Parnas ba AR aes 4.00 6.20 Burettes, Precision, with three way glass stopcock, graduated in accordance with the requirements of the P. T. R. at 20° C and with unofficial factory certificate, size 50 ce in {yths............. 4.60 Precision Burettes with official Physikalisch-Technische Reichsanstalt Certificate These Burettes are exactly the same as those described above in workmanship and accuracy but are furnished with the P. T. R. certificate and control stamp, for which a higher price must be charged because of the German government fee. Burettes, Precision, with pinchcock, rubber tubing and glass tip, with P. T. R. certificate. DIZE eee caenls « Sayer ey obees 25 ee in ;bths 50ceinyoths _—*100 ce in 3ths CHS ee = Wee eee fs Sees Sr SEE ate tS Jit __ 5.25 ! 6.15 7.85 Burettes, Precision, with straight glass stopcock, with P. T. R. certificate. ; SIZEMAT ee Pia eee Seki i ee 25 ee in j5ths 50 ce in yoths 100 ee in 4ths Bacchi thence caer re ae ccs pte 6.15 | 7.00 9.65 Burettes, Precision, with glass stopcock set on at an angle, with P. T. R. certificate. SIZE eee eres cee PP tet ee Le E Moa ee __50 ee in yoths _ 100 ce in $ths DENY tides ec ae tend a cOthleicin Gee OO Grin SE Ee AON ae caer cise ce __ 7.00 2 9.65 Burettes, Precision, with three-way glass stopcock, 50 cc. in 7>ths; with P. T. R. certificate... .. 7.85 89 297, 224 00 No. 22692 No. 22740 No. 22744 No. 22716 No. 22720 22692. Burette Support, Chaddock, with rubber lined wire clamps for holding the burette which is read- ily placed in position or removed by simply springing back the wire. The rod and base are of polished wood and a piece of milk white glass is fastened on the base. For two burettes... 1.50 22696. Burette/Support; same as above, but for one burette.........:......+..-cos--5e) eee eee 2.50 22700. Burette Support, consisting of rectangular base No. 37668, medium size and adjustable clamp No. FR Te OA COS OOO ROR OO eee nae 22704. Burette Support, consisting of porcelain base No. 37680 and brass el: amp for one burette, No. 24554. . 5.25 7 22708. Burette Support, consisting of porcelain base No. 37684 with brass rod in center and brass clamp No. 24558) for two burebtes’. 251.225 o.ccore couse erates here erence Cicie wrotey ole tee Tae eieT Tare See 3 22712. Burette Support, of wood, with cork lined ‘clamp, for one: burette=.......0... 4.+- ase eee 1.00 22716. ss same as above but with an extra arm to keep the burette steady. . 1.40 22720. & G3 ; with cork lined clamp, for two burettes:.....5.......-2..-2.-sseeeeee 1.25 22724. ss «same as No. 22720 but with double arm to keep the burettes steady... 1.50 22728. se ss with round porcelain base, brass rod adjustable as to height and revolving clamps, forfour burettess thi ee ese. of See eS ree 7.50 22732. Titration Outfit, consisting of wooden Suppor: and two burettes, 2 aspirating bottles of 1 liter capacity and rubber connections, pinchcocks, etc., as shown in illustration. ¢ Jompletes se eeeees 8.25 22736. Support, only, without (glassware sc o,...0. 06 ss02.+.cee sche eee oe eee een ee oe 6.00 22740. Burette Support, consisting of 1 rectangular base No. 37672 22744. Burette Support, consisting of automatic burette clamp No. 94570 for two burettes and new ae of support permitting the use of same in the vertical position and also in a horizontal position by hanging the base plate on the wall by means of aperture provided ................-- 3.75 22748. Burette Support, as above but for one burette.. made 90 No. 22760 No. 22768 No. 22772 No. 22776 - 2278 No. 27786 22760. 22764. 22768. wyeNynwny Ney Sad os Sear bo to oa _ ir) 22820. 22824. Burner, Argand, with lava lip and sheet iron chimney. Flame is adjustable and can be turned very i 1.00 Its nak Sea SRORA On CO DURES OSE OND ODM aO ROOoE AS ee neAUnTaad a Sada saeos Soaps omeaoah apoaooy Glass Chimney for use with No. 22760 Burners, with clamp to attach to burner............ 1S Burner, consisting of an ordinary gas jet with 12 inch stem on heavy iron base. Very convenient im BEM OT AG OL G2 Seo staie is 2ysccte-spey ste. aye cva%e oho: cter a oy cscbctatntaya drones aveca ase yaer aie: oadHiness oti: Bere Si!) 2.30 23136. Extra Perforated ‘Copper ‘Cap for use with Burners No. 23128 and No. 23132 Diameter pinches 206 .-cc.0s 0.24 see ee eee eee ee er ee ee ee By : LON} | eS ae SURE ae eMEee ESO crates a Seba InOM Seneca eR Gras s504: - -30 35 23140. Burners, Koch Safety. With automatic stopcock to close off the gas when flame is extinguished. Of improved construction with spring control and very superior to those in general use. With threaded inlet for attachment of flexible metallic tubing. Height, inches..... AT I sc Soke oo Ge 5b Ja) hae teetine ee 6 Diameter of tubes inches.<..:......-. ss nse see ee ts Te | DEX] | nee ee ae ee ee aOR Senco x 5.00 6.50 23144. Burners, Koch Safety. Same as No. 23140 but adjustable for height. Height, inches. . AOC OHIa CGE aaa ie DERE RES SE entero nos ctoA aoc 9 10 Adjustab!e to, inCHESe NM ee ea neeky A re 13 14 JOE RRR eer tids Sabconons So aE Mee nena oo ddcinh eo boro osdgtods aces > 7.50 8.50 23148. Burner, Koch Safety, with weight instead of spring release. On a stand providing both horizontal and vertical adjustment; with mica chimney to protect flame from drafts. Very superior in operation to the imported article of same description and made here because of dissatisfaction with! those iof:forelgn/ make’. yes scc.jsccecs paces ois yas nieiatelaittnte Oe olen ee eee 10.00 23152. Burner, Koch Safety, same as No. 23148 but with two burners. Complete on adjustable stand and with two mica, chimneys? 2.526 ccsiccis.cjc8sciee0 cs ie soies sade ota beleie bee eee eee ee 17.50 23156. Flexible Copper Tubing, specially arranged to connect above Koch Burners with our American Standard Incubators, Paraffine Ovens, ete. With 2 inch i. p. size coupling at each end which connects with thread regularly supplied on burners and on the connecting tubes of our American Standard Ineubatorss2 sis ieictic a se a tee ee Oo ae Reeth dat sc Dees SEU OEE e 1.00 23160. Burner, Barthel, for denatured aleohol;enamelled finish, with brass reservoir; smokeless, economical and a satisfactory substitute for the gas stove in laboratory work where no gas supplv is available. With one burner’. < 5:5). acs ajo. aceuis Setactae serene Slaves ois eee oes a eee 4.50 23164. Burner, Barthel, same asabove, with two burners and one brass reservoir 23168. 23172. 23176. 23180. 23184. 23188. No. 23168 No. 23184 No. 23188 Calcimeter, Scheibler, for the determination of carbonic acid in boneblack, etc. Complete..... 25.00 Bottles with special glass stopper with tubulation -............. Said i a OO. Rubbers Gaps sere eee eee ae ii ee See Soaeer pea Ley oO. Balloons ofsthinerubbercee meee cease ek clon eae OEE Sch me ee tte ie eerie: 65 Calcimeter, Scheibler, for the determination of carbonic acid in saturated gases, complete. . 32.00 Calcimeter, Scheibler-Finkener, as used for determination of carbonic acid in marble, limestone, ete.; complete with thermometernand barometer... .---0.9;.-5-2 224 donee tse ieee 28.00 S —a —— : | : | = 4 : 4 8 Se _ ~ == = € (4 “A 4% i ¢ & = || al 4 ——_ = SS arco No. 23192 No. 23196 No. 23200 No. 23208 No. 23212 No. 23216 No. 23220 No. 23224 23192. Calcium Chloride Cylinder, narrow Pane on foot, with tubulature near bottom. ley otra pages tre ae Mepyetets evomnces e's) o.Sis 210 260 315 350 420 470 Diameter, mm..... BR emo :c Soret 25 40 45 50 55 75 LORY? ects’ & Eege e Goi Reitman te cates 50 -60 75 -90 1.10 1.90 23196. Calcium Chloride Cylinder, wide mouth, on n foot, with tubulature near bottom. IRIAYO Nr, Tt ene etna mene a ore at 210 260 315 350 420 470 DD IaMeLEL: NMG A hit. srrhateraatt steve e ctctonss ss 25 40 pe au45 By 55 : 75 ACH re eee ores ahaiteys -50 i COmN 75 90 1.10 1.90 23200. Calcium Chloride Cylinder, with perforated ‘glass stopper and side tubulation at top. EVE ote rxiinie pee tee PN rk ae yeep pete ahs areal so ce Stee Oe aioe eevee Bis ese aoe 225 350 IDNA eyes TTL so, 6 hae ACCC aot 2o Se DE IEE eee a riore ie oes: Nek ey) lDEYE Oils pao cloetn uenald aitly CGO ts DER oan Senor Pens GMP e a aris p 2.00 2.25 23204. - Calcium Chloride Glass Support, to prevent the calcium chloride from falling into the lower cham- OGY? OG Ga a a Ne bem ERA BISA Ou CITI REISE ne ciao Aon alo atin a Sener 30 23208 CalciumiChloridesHolder fori alancercases® .cnix/m.c:cces soe aac eo eed ee ee ee ceases 75 23212 GalciumiGhloride- Drying: rupe: Lav MOGs. 2 «ssc nein ose Oe ea ese 50 23216 Calcium Chloride Tubes, straight, with one » bulb. LDyeraYig A rig 60000 ol eRe EL eS ORRR Sore Cee Ne ICS 100 125 150 200. 250 ELA CH ere a eS colo oes choices ine Ao Reuters -10 -10 12 15 -20 23220 Calcium Chloride Tubes, straight, with two bulbs. Length,mm.. 100 125 150 206 | DIT ae eae es ene SOS Bis Ese ae SEES ener ics oa aoa -10 12 15 20 23224 Calcium Chloride Tubes, with two bulbs, and inner tube to collect moisture. engeihe mime. oe ec e. J Fe MN rat rcs NE at 100 125 150 200 | OFT 1 seh PRA ir A Sa Oe Ear CAS Pate 15 Is -20 25 99 < Y View in Salesroom showing special! stands for Distilling Flasks, Retorts, Beakers, Museum Jars, etc. 100 No. 23228 No. 23232 No. 23236 No. 23240 No. 23244 No. 23248 No. 23252 23228. Calcium Chloride Tubes, U shaped. Length, mm : 7d 100 125 150 175 200 250 300 Each “ald 15 18 20 23 28 35 45 23232. Calcium Chloride Tubes, U sh: uped, with two side tubes. henethaame eee Jb Glad St SO eee 100 120 150 180 200 DE] peers ea cele cla Mae Reenter ers Gos, sonagaapnic a5 .20 22 -30 35 23236. Calcium Chloride Tubes, Vollhardt, with two side tubes and bulb. Mer pti hac oss ahss wits yet sehen ene I ne te ae 125 150 200 LORYE Us: Ge es oe ere cet ciate sa Gcitacah ee rE oc 30 35 50 23240. Calcium Chloride Tubes, Peligot, with ‘three bulbs. Ren cubes elec sans oe eee er sc5 3400) _ eS 150 180 200 Each.... = esi!) 35 AD -60 735 23244. Calcium Chloride Tubes, with ground in outlet tubes. Length, mm...... Be AA ee ones Cone SOA On ah oan onaos _ 100 125 150 Each.. sea Sade RE AAO eat Cees Ee 50 -65 75 23248. Calcium Chloride Tubes, Marchand. TEM OLA MMINTD: oes td ack See eee eee alee eT ae EERE eee 100 120 150 | OF) 5 ae eR ae ed Rr oS court Oe aren d oA Stair ORS 20 30 35 23252. Calcium Chloride Tubes, Schwartz, with side tubes and perforated glass stoppers. en eth MM So:2 nae aoe ocean oe etaeecee 100 _— 120 _ 150 180 200 Each EP NA OOo -90 1.00 HSTG} 1.50 1.75 No. 23300 No. 23300—Sectional View CALORIMETER, PARR STANDARD. The marked features of this method are accuracy, simplicity, ease 23300. 23308. 23310. 23314. 23318. 23322. 23338. 23346. 23350. 23354. 23358. 23362. 23366. 23370. 23374. and rapidity of manipulation. The results are absolute and not relative. The operations are such as can be carried on by one not specially skilled in laboratory processes. Oxygen under high pressure or any pressure is not used. The time consumed in conducting a test on a weighed and dried sample should not exceed fifteen or twenty minutes. Sodium Peroxide is used as the combustion medium. The CO: and H,O formed in the reaction are at once absorbed by the chemical, giving a solid residue instead of gaseous products. It will at once be seen that the apparatus required is simple in construc- tion and easy of manipulation. Calorimeter, Parr Standard, as above described complete for Electric Ignition, complete for either lighting circuit or battery, with special thermometer 65-90° F. graduated to 75° I’. with Bureau of Standards certificate, 2 liter me asuring flask, chemical receptacle, measuring cup, 5 inch 100 mesh brass sieve with bottom, chemical sufficient for fifty determinations, pincers, ignition wires TesdInPwens with support, camels hair brush, CbCs a> sell eiecleiet eae erie einiseie sera 75.00 Reading Lens, for reading the divisions on the thermometer. This lens uses the thermometer stem for its sey thereby maintaining the same angle of vision for all points on the scale, without support. . er ee la ure ake ee NAVE aD evactele cadavers eteteretole Sooue ogame epee ono. AlN Reading Lens, same as - No. 23308 but with SUP POT ba. use AN ei oe eee eee eiictine a pecker: 3.00 Bank of Resistance, for use when igniting the charge of the Electric Ignition bomb. The 110 volt outfit includes five lamp sockets, wired up in parallel together with switch and fuse block and for 220 volt two lamp sockets in series and five in parallel, with same accesories. Voltage........ Spee epecsiae : Penmaone eee LO Wolts 220 volts Each. . fin she seasons See ae oe 5.00 5.50 Water Motor and support SH Acagt ot daetp ROP ae rentD conmieadoacte: idee a0 Eat Oadae ORE 5.00 Electric Motor, variable speed for either \.C. or D.C. v olt age -must be spec isa apache aes . 12.00 Bomb, Electric Ignition, complete with wrench POA ic ain acne es . 30.00 Thermometer, as supplied with the outfit, 65-90° I’., in \,ths with B. of S. certificate... . 19.00 Special Thermometer, 65-105° F., same as above......... . Oe Ke see, 5200 Accelerator, 2 oz. bottle... ere i) Barium Oxalate, 2 oz. bottle ; ree 50 Gaskets for bomb, per dozen... Aa eed) Hydrone, 2 ib. can......... Sf apyonias see leds) Special Chemical, 2 0z. bottle ae serps Ra AS aoe 75 Sodium Peroxide, a special grade. Size of can Bean sooe relly 1 |b. 1 lb. J DEH Us oe GUS O en oS Badd Gene aso Sap apca nce Rete eeceetoiets Sees. Scho nc) 1.25 2.00 101 23378. 23382. 23386. 23390. 23394. 23398. 23402. 23406. 23410. 23414. 23418. 23422. 23426. 23430. 23434. 23438. 23442. 23446. 23450. 23454. 23458. No. 23378 No. 23446 Calorimeter, Parr Oxygen Bomb. The new features consist of a bomb of a new acid resisting alloy superior in strength to the best tool steel and which obviates the use of any platinum or enamel lining; the use of rubber gaskets in place of lead and a new automatic oxygen valve. Complete with ‘bomb, water container, insulating vessel with cover, stirrer and pulley, oxygen connection with gauge, needle valve and couplings, ¢ octagon holder for bomb, ring support for holding calorim- eter covers with thermometer spanner wrench, electric motor with variable speed, direct or alternating, one-half dozen capsules of special alloy, thermometer graduated in 3° F., with U S. Bureau of Standards certificate, reading lens and support, “special ignition wire and Baskets sie cii ds shoe ied eae eae ieee ee eee ene 2 ih Sas oO .... 800.00 Accessories for Parr Oxygen Bomb Calorimeter. Bombyonly- Ofiacid resisting alloy,ny--a-e-eece e-toc eee - sis-dis 21s Chis te areeee 175.00 Waters Containers pare, oo casee eee seaa eee io ned hoe 10.00 Insulating Vessel with cover, stirrer and pulley............... ak ii ac: 45.00 Oxygen Connection with gauge, needle valve and couplings...............0...00 200 c eevee eee 26.00 Octagon Holder for Bomb, with spanner wrench..................... wisiavelulols eee te 10.00 Electric Motor with variable speed, direct or alternating..................-.0-eeeeeee eee eeee ee 12.00 Special Thermometer, as regularly supplied with the outfit, 65-90° F., graduated in 4,;° F. with U.S. Bureau of Standards certificate...... Dale oe ogee Mabe See eee 10.00 Reading: Lens*andsuppontay mises ozs cdse a cine atin eer laser eieieians se ies ci eeeeeee Seer -O0 Ring Support for holding calorimeter covers with ther sHmMometelacee es eee . uiae eee Eee 2.00 Special Ignition Wire, per card........... Hc SOE PPR ERA RO a Ce es .50 Large Gaskets for Bomb, per dozen.................--....---- bade einials 3 3 olae ee Oe 75 Small Gaskets for Valve, per dozen.............. Satakelersus.n Sel eisie ea etek Os eee ee 75 Small Gaskets for Union, per dozen... Sos: deca ay/ahe alle be reeokoys cat Oo ethos lee evs elekeT oe ee -25 Beckman’s Differential Thermometer, graduate: th to 7is° C. with P. T. R. Certificate of Standardization ...... Bee. oa dig: w/a wie tarde Wye sacs Where. Brace FEISS ROE ene 25.00 Capsules (special alloy) 3 dazu Segui wissn\2-P dogs SM ae ale oenuele ela cete lake wet ap eee eee 6.00 Bench with hinged top and locking device fon oxygen ogling: Blue print for constructing bench willbe sent free onirequest-....-. .... «hee sme eee toe oe es Oe ec eee 18.00 Calorimeter, Mahler Bomb, original French make, constructed under the supervision of the author. A standard instrument throughout the world. With enamelled steel bomb, stirring apparatus, platinum tray, etc., but without thermometer, oxygen cylinder and primary battery as shown in illustration. (Price subject to variation because of platinum market). Duty Free.. on ee wer 248.75 Stock. oo 0 oeon idsicen leer eee 300.00 Thermometer, estan Fre ane h make for use with above, +°8 to + 19°C. in =ths.............- 22.50 Thermometer as'above, —— 18 to =— 297 ©@2 am) ep thsie acces secs ree clerclesi ne orclele nie eielsoe ene eee 22.50 Thermometer as above, + 14 to + 25° el : Shave dale w Tie arate ule oo sie ein dialer ler ate ene 22.50 102 No. 23470 CALORIMETER, EMERSON FUEL. This is a calorimeter of the so-called “bomb” type, with its essential elements of operation the same as the original Berthelot type. It, however, embodies improvements in design over the older types of bomb calorimeters which tend to increase the dur ability of the instrument and greatly facilitate its operation. The bomb is made of steel, consisting of two cups joined by means of a heavy steel nut. The two cups are machined at their contact faces with a tongue and groove, the joint being made tight by means of a lead gasket inserted in the groove. The lining is of sheet metal spun to fit the interior. The bomb is made up tight, with a milled wrench or spanner. The ] pan holding the combustible is of platinum or nickel. The fuse wire should be platinum in general fuel testing. In standardizing the calorimeter by means of cane sugar, benzoic acid, etc., it is necessary to use iron fuse wire. The jacket is a double walled copper tank, between the walls of which water is inserted. The calorimeter bucket is made as light as possible, of sheet brass. The stirring device consists of a paddle wheel shaft enclosed in a vertical tube to facilitate its action in circulating the water. The stirrer shaft is driven by a belt from a small motor at the other end of the stirrer bracket. The motor is mounted on a sliding plate ‘which permits of a changing position of same to vary the tension on the belt. This varying tension serves to regulate the speed of the paddle shaft by thus varying the speed of the motor. The stirrer is mounted on a post on the calorimeter jacket, as is the thermometer holder. The motor is driven by a 110 volt circuit and should be placed in series with a 16 c.p. lamp. If so desired, a motor driven by a battery can be specified in ordering the apparatus. The battery motor is driven by a six volt storage battery. The Edison-Leland Type of battery is preferred. These motors designed for the 110 volt power circuit may be driven on the other voltage provided that a proper resistance be placed in series so that the current in the circuit is one-half ampere. The motor may be driven by either direct or alternating current. The piping for the insertion of oxygen under pressure is made especially strong and durable. The piping of small internal bore is made of heavy brass. The system is fitted with a hand nipple at one end to make the con- nection with the bomb, and the other end has a special fitting to grasp the oxygen supply tank. The oxygen piping of the regular Emerson Calorimeter outfit is designed to fit the oxygen cylinders sent out by the S. S. White Dental Mfg. Co. For prices see page 252. Oxygen piping to fit the oxygen cylinders of the Linde Air Products Co. can be specified in ordering the appar: atus. The oxygen piping furnished to connect with 8. 8. White Company’s cylinders is designed for two cylinders while that furnished to connect with the Linde Air Product Company’s cylinders (which are considerably larger) is designed for only one cylinder. Commercially pure oxygen, free from all traces of combustible gases should be used. The plate holder or vise is to be used when tightening the nut of the bomb with the spanner. The table with the rotating top is to hold the bomb when the same is connected to the oxygen piping. The spanner or wrench is a forging with 30 inch handle and is used to make bomb up with g: as tight joint. 23470. | Calorimeter, Emerson Fuel, as described above, complete with steel bomb with spun nic kel lining, calorimeter can, double walled calorimeter jacket, heavy piping leading to oxygen supply tank, high pressure gauge, special holder and spanner, stirrer with motor attached (battery drive can be supplied if desired) nickel pan, thermometer holder, gaskets, etc., but without ther- MOHD oA leat oan te Ob Ona ne CeO On OEMS R OO EEE nncnen span RapascenseAG comb oot ocdr Se socal RI) 23474. Calorimeter, Emerson Fuel, same outfit as No. 23470 but with gold lined copper cup instead of ay ‘ 5.00 22478. Calorimeter, Emerson Fuel, same outfit as No. 23470 but with platinum lining: (Price subject to market PENTEL Gi yO aoe Seco. lon Goa ReR SGD Sae Be oacmennecor corcdecnowooosoDd acoso oS 490.00 23482. Nickel Lining only for Emerson Fuel Calorimeter...........---.+-+++++-- SSB oor CRG OCICS 12.00 23486. Motor only for Emerson Fuel Calorimeter.. Oe oS Rd op MN heen ios corn os orate eterna 8.00 23490. Thermometer, Beckmann, Goetze make, range 5° to 6° C. in et) without certificate .......... 15.00 Paasieee Chermometer:-a5 ab0Ve. wath 2 l R. CeEntifiCa bes cre)c irc. anvere els ateleats == at einavelele inl el eaveseleiajerslelele reielerel« 25.00 103 No. 23500 CALORIMETER, RICHE IMPROVED ADIABATIC, designed for use in all branches of calorimetric work, i-e., the presence of heat power in coal, food or other commercial products the values of which are mate- rially altered by impurities. The bomb is of the Krécker type, provided with two outlets so that carbon determinations can bemade. The bomb is supported by a hinged ring which is raised and lowered without touching the fingers in the water. The water jacket for the bomb consists of a vacuum cup which insures both isolation and insulation. The stirrer is of the screw propeller type and the rods are insulated by passing through hard rubber with a hardrubber capscrewed oneachend. The vacuum cup containing the water is surrounded by an oak box lined with one inch pressed cork glued to the wood. On the cover, inaddition to the cork is glued apiece of hair felt one-half inch thick, effecting a tight joint with the top of the vacuum cup. Ignition of the substance in the bomb is accomplished by a current from three 2-volt storage cells. The current first passes through a 3-ampere fuse wire in series with a platinum wire within the bomb itself. The platinum wire is connected with the substance to be burned by means of a linen thread of sufficient size to secure ignition. In making combustions, the substance to be burned is prepared, weighed and placed in the bomb, which, after being charged with 30 to 40 atmos- pheres of oxygen, is then placed in the split ring and the wires connected. The water in the vacuum cup is brought to any temperature within + or — 5° of the room temperature. The thermometer is adjusted and the motor started. Readings are then taken until the temperature of the water becomes constant. The sample is then ignited by closing the switch and the readings are taken. The heat absorption is complete when the thermometer shows a constant temperature for three successive min- utes. When the bomb is removed and opened and rinsed with water, the rinsings are titrated with ® alkali for nitric acid, using litmus as an indicator. This calorimeter may be used with any of the standard bombs now in use. See Journal of the American Chemical Society, November, 1918. 23500. Calorimeter, Riche Improved Adiabatic, complete with thermometer......................-...-- 225.00 23504. ss sees 23052. eae oe i 23540. Lamp and Scale.. Sac ctatn cen eee eae, PRONE ESE Se REAL bya ented: dec 25.00 23544. Thermometer Outfit, as above, ‘sensitive to .0008°C.. consisting ‘of R eading Bridge, uncertified Resist- ance Bulb, and Galvanometer with Telescope and Scale, but without. ( ‘alorime tele 244.00 23548. ReadinguBnid? ers sa ety oe cree ete al nce eee eee IID SKOOL SAE Otani Eee 150.00 23552. Galvanometer, with Telescope and Scale......... : Roasts SP hot a .. 54.00 Calorimeter Thermometers as above described are used by: U.S. Bureau of Standards Armour Institute U.S. Bureau of Mines Harvard University U.S. Department of Agriculture, Nutrition Laboratory Cornell University Medical College J. S. Naval Experiment Station Pennsylvania State College City of St. Louis Ohio State University University of Illinois University of Chili Johns Hopkins University Ottawa Department of Mines Massachusetts Institute of Technology Etc., Etc. CALORIMETER, ATWATER BOMB, widely used in determining the heating value of feeding stuffs, foods, the adulteration of fats and oils, in addition to coal work. See Journal of the Americar Chemical Society, Vol. XXV, No. 7, July. 1903. The Atwater Bomb Calorimeter can be furnished with complete plati- num bomb, at an extra price which must be quoted on application. The regular outfit consists of the following: Bomb, with rolled gold plated copper lining for shell and with top nickel lined and nickel supports, complete with one doz- en nickel capsules (three sizes), tools, ignition wire, gaskets, etc., for use with bomb ...... : .. 150.00 Clamp, for holding bomb with spanner .............2. 000 20scceeeeeeseeeeeee s 2. 715.00: Support, for holding bomb while changing, manometer, and connections .. 16.00 Pellet Press and Mold, complete..................2....0-00+ .. 25.00 Calorimeter Cylinders, complete with water hol der, stirrer, thermometer support and elec trical connections. . 25.00 Direct Current Motor, with speed reducing gear.. SeepaDCOOS In : SSbgban . 20.00 Alternating Current Motor, with speed reducing gear. SEAR OCOAGBO AC OOT DS .. 22.50 hex sneriGten eA Gig | GLASS oe oe eyelets eta eta oie ots <= oeiee cinta tea etelalptale|« otatalatafetsie(l=t=inintnl “r= .. 6.00 Electric Tapper, for use with thermometer, complete with batteries, push button and wire 5.00 23560. Complete Outfit, consisting of the above, without thermometer, with alternating c inrent motor. 264.50 23564. Ke st “ s “s “direct current motor...... 262.00 CALORIMETER, FERY THERMO- 23568. 23572. 23576. 23580. 23584. 23588. ia i No. 23568 ELECTRIC, a new applica- tion of the thermo-electric couple to calorimetry, pro- viding the following distinct advantages in the determi- nation of calorific power :— Direct reading in calories on millivoltmeter scale. Omission of water jacket, the steel bomb itself con- stituting the calorimetric mass. Omission of mercurial ther- mometer with its attend- ant difficulty in reading. Rapidity of determinations, i. e., 15 minutes. The bomb proper con- sists of a steel cylinder lined inside with nickel to prevent oxidation and surrounded on the outside with a close- fitting copper jacket ‘‘D.” The bomb is supported in an outside copper cylinder ‘‘A”’ by means of constantan disc “E.”’ When the millivolt- meter is connected as shown, the steel bomb, the con- - stantan dise and the outside copper jacket constitute a copper-constantan thermoelectric couple with the hot junction at the point where the constantan disc ‘‘E”’ is joined to the steel bomb and the cold junction at the point where the constantan disc is attached to the outside copper jacket. Experiments at the British National Physical Laboratory and at the Laboratoire National des Arts et Métiers, of France, have shown that with a comparatively constant weight of sample and a uniform oxygen pressure in the bomb the elevation of temperature is proportionate to the calories released in the bomb divided by the weight of the sample in grams and that in a long series of tests the error in readings on benzoic acid were found to be considerably less than 1%. As the needle of the millivolt- meter remains at the point of maximum deviation for about 15 seconds, the readings can be taken with great accuracy. The ignition is accomplished by a hot wire heated by an accumulator of 60 ampere- hour capacity at 4 volts or bya magneto. See Génie Civil du 25 Mai 1912. Calorimeter, Féry Thermo-electric, with bomb, copper jacket and millivoltmeter. Duty Free. 193.75 Duty Paid 232.50 Calorimeter, Féry Thermo-electric, as above with certificate of the Laboratoire National des Arts et Métiers. Vertical Section through bomb showing connection to milli-voltmeter. Duty Free EE foaemoe 200.00 Duty Paid:. 2. 2! 240.00 Manometer, for automatically controlling constant pressure of the Oxygen. Duty Free....... if ’ 18.75 Duty Paid. .... 0. eee 22.50 Pastille Press, with moulds. Duty Free ; 15.00 Duty Paids.. 622... eee 18.00 Accumulator, 4 volt, 60 ampere-hours. Duty Free ae eeoses 2 TPs Duty Paid... 5... ac... cee 13.50 Ignition Magnets, to be used in place of the Accumulator. Duty Free : . 16.25 Duty Paid... .::0:...00505 7 19.50 106 aa vs) =| a0 e v9) < | Li Oe Mi ALS GeO IM Se as IN ~< % é LE LIRR PEABO ED | | | No. 23592 No. 23596 23592. Calorimeter for Gas, Parr. In this instrument have been eliminated the main sources of error, i.e., the metering of gas, the radiation of heat, the variations due to the differences in the humidity of the air, the uncertainty as to the quantity of air used, the incompleteness of combustion and the inaccuracy of the numerous thermometric readings which are necessary. Determination is based upon the burning of a standard gas of known composition and heat value on one side and the unknown gas on the other, in such a manner that equal volumes under equal pressures and equal temperatures may be made to impart their heat to equal volumes of water. The heat values are, therefore, in direct proportion to the temperature readings of the two ther- mometers and the metering of gas thus avoided. See Journal of Industrial and Engineering Chemisiry, August, 1910. Complete, including generator for standard gas, electric motor for driving the apparatus, thermometers, reading lens, pilot lamps, gravity tank, one 2 lb. can of Hiydronerand sinstruculon OOK amas eee cie cen. siieaen ene Frases OM Sad ae 275.00 CALORIMETER, SARGENT AUTOMATIC GAS, for determining the calorific value and the dust, tar, mois- ture and solid matter in commercial and inflammable gases. The Calorimeter consists of a wet test meter in which the gas consumed is accurately measured. From this meter it flows to a governor which maintains a uniform pressure of the gas at the burner. In the calorimeter proper the accurately measured gas is burned and its calorific value is manifested in the rise of temperature of measured quantities of water flowing through. From the calorimeter proper the heated water for each unit of gas burned is automatically discharged into one of the pails in which it is weighed on the decimal scales. The pounds of water, times its rise in temperature in degrees Fahrenheit, times the quantity of gas in cubic feet consumed, gives the B. t. u. direct. The complete outfit consists of the follow- ing equipment, only one pair of thermometers, of course, being necessary. 23596. Calorimeter Body with automatic attachment, Bunsen burner, tubing, exhaust thermometer and [SEAS os Le Coe he Aihara) seat ee ORE are gt ao Wer Be aoe cee on a 100.00 23600. Two Thermometers, inlet and outlet. Graduated to {;°. For ordinary work................. 16.00 23604. Two Thermometers, Precision, inlet and outlet, with certification. Graduated to j5°... ...... 30.00 23608. Wet Pressure Governor with weights......... ‘ , : me E500 23612. Wet Test Gas Meter with all attachments...... ; Sopoes eran) 23616. Scales, special, 10 lbs. weighing to ;},5 lb......... . 12.00 23620. Two Weighing Pails, Balanced and nickeled........ é : erate Stee 5.00 107 No. 23624 with No. 23628 and No. 23632 CALORIMETER, JUNKERS GAS, for continuous combustions, to determine quickly and exactly the heating value of gases and liquid fuels. For gas works, gas consumers, laboratories, manufacturers of gas motors, establishments using gas motors, etc. The heat developed from a constantly burning flame is entirely transmitted to an even flowing stream of water. This is the standard gas calorimeter through- out the civilized world. A galvyanometer or millivoltmeter as regularly used with Thermocouple Pyrometers can, with slight alteration, be used in taking the readings on this instrument. Calorimeter, Junkers Patent Gas, including two thermometers 0-50° C. in #)ths, reading lens, neces- sary rubber stoppers, tubing, graduated cylinders, etc., in polished case. Duty Pree\>.,acitsniinesioo tenis arn 115.00 Stocks: . casein eee .... 136.00 Gas Meter, 3 liters, for use with above for rich gases, with two thermometers 0-50° C, in single degree divisions, measuring cylinders and case. DutysBreests\ Slee eee 36.30 Stock ic5s.di ech eee 45.00 Gas Pressure Regulator, for above, with extra valve and case. DutysRreesss stactreeseecoseeree 14.85 Stock: icine cose eee 18.00 Note—The above three units constitute a complete outfit and are furnished at the sum of the prices, i.e., duty free at $166.15 and from stock at $199.00 Gas Meter, for 10 liters, for pure gases, in case. Dutyebreevenns cera cer eee 43.00 Duty Paid!) 05... <2 eee 52.00 Accessory Outfit for Liquid Fuels, consisting of precision balance, burners, etc., in case. Duty [Bree saGiscssise cate neee 36.30 DutyPaid.. 303): 95- oe eee 45.00 Thermometer | (as furnished with Junkers Gas (C; alorimeter), 0-50°.@. in eths. <2. eee 5.00 0=50°'C.. int 1°. 3.2.6 50 eee ER No. 23652 No. 23652 EXPLANATION OF DIAGRAM WATER METER A, GAS METER B, which by means of a light running coupling (usually cogwheels with chain) are compelled to keep the relation between the quantity of gas and the quantity of water constant. CALORIMETER BODY C, the arrangement for continuously recording the heating value which takes up the gas flame and gives off the heat developed therefrom to the stream of water continuously flowing through it. REGULATOR D, which allows the water to flow to the plummet box. a E, whicb provides for 2 regular flow of water to the water meter. TWO GAS PRESSURE REGULATORS F1 AND F2 which keep the pressure in front and behind the gas meter regular within certain limits. DIFFERENTIAL THERMOMETER, with connections, a thermo-element for the production of an electric current, the tension of which denotes the difference of temperature between the incoming and outflowing water. TWO CONTROL THERMOMETERS for the incoming and outflowing water. CASE with tightly fastened connection pipes, etc. CALORIMETER, JUNKERS AUTOMATIC GAS, for the continuous measurement and recording of the heat 23652. 23656. 23660. 23664. 23668. value of gases. For gas plants, coke ovens, blast furnaces, foundries and all other establishments pro- ducing gas for light, power and heat as well as for laboratory investigations. The instrument requires no measurement of water or gas, no watching of thermometers and no calculations, the calorific value being continuously shown by a pointer. Readings can be made at points distant from the calorimeter or at several points simultaneously from one calorimeter. Calorimeter, Junkers Automatic Gas, complete as above described, including calorimeter with thermo- electric pile, apparatus for measuring the proportions of gas and water with supply regulator, regulator for gas pressure, cupboard with glass doors and accessories and reservoir for supplying water constantly to the apparatus for measuring water, but without galvanometer. DUTP REECE ate cote Oe 313.50 Stock ae ee ee ... 380.00 Galvanometer, Indicating simple construction, for use with above. 1D Uta lo aap enon Aa : . 49.50 Duty Paid..... Set os BOR 60.00 Galyanometer, Indicating improved construction. Dityz Breet noose : 66.00 Duty Paid wo .... 80.00 Galvanometer Registering, with 24-hour charts. Duty Hrees sostee aks — 148.50 Duty Paid... ; BET oo i SUL 00 Galvanometer, Registering, for continuous operation. Duty Free....... ' 214.50 Duty Paid ... 260.00 109 23700. 23704. 23708. 23712. 23716. 23720. 23724. No. 23704 No. 23708 No. 23700 No. 23728 No. 23736 Carbon Apparatus, Parr, for the determination of total carbon in coal, coke, etc., in connection with the Parr Calorimeter. Complete with directions and tables.........................00: 45.00 Carboy Inclinator, Universal, strongly built, of iron throughout. Is shipped knocked down and may be assembled in a few minutes. Delivers the last drop from a carboy.................-.-..-- 5.00 Carboy Stopper, Hard Rubber, with air inlet and soft rubber cap to fit over the mouth of the carboy; foritheiconvenient handlingyof acids. s1sc.ciaa see cna ee eee are eee eee 4.00 Casseroles, Sanitats Porcelain, trade mark ‘‘arrow,’’ with porcelain handle, without lids. Calpacitymcestcc a: ons memes ee eee 30 70 100 125 250 375 625 1000 2000 IDS OMNAE, The anoanagndebhs adoAobonweae es 50 65 US 85 100) 110)” 130) 160 me2s0 Hach ee eee ae is oe eee eee LST 20 30 F230 sb ae Oe OU rare Casseroles, Sanitats Porcelain, trade-mark “arrow,” with wooden handles but without lids. Capacityancebennerninstsssuiceosertn. eee eer 125 250 375 625 1000 2000 Didmeter wm ee ese ae ence een 90 110 130 140 160 200 LEXA OSH abitio.s Ouiae Oo OO OREO ER OLIRYS ne 40 55 -70 85 1.15 2.10 Lids only for C asseroles No. 23716. MORATBIZE mE ComMee eels scene 125 250 375 625 1000 2000 ] DEY As Rei nantes o cee Sic Dae aI CaS -10 “15 -20 -25 30 50 Casseroles, Royal Berlin Porcelain, trade mark ‘“‘scepter.’’? With porcelain handle, without lids. Capacity, cc..5.-- 30 75 150 210 375 750 1250 2000 Diameter, mm..... 50 70 85 95 110 135 165 175 Each........ 40 50 60 15 90 1.65 2.10 3.60 Casseroles, Royal Berlin Porcelain, trade mark ““scepter.’”’ Deep form, with wooden handle. Capacity, icc. :.... Sopa woboawe ae 5 2 comers Wipe ttielarete eens eee L050) 1900 3230 DiameterwmMs homer eee rere soy date taus atetalay tetas fe eeetatetee erate 110 140 170 Height, mm....... Ayyney ey dee Bs SAL cts Shee sh OR ce ees 55 180 205 Bach A004 s 5 on) ce Sh ca ee Ce EC Ae ne 2.00 2.90 4.40 Casseroles, Opaque Fused Silica, shape of 23724; glazed inside and outside, with handle. Capacity ces ean sete soe cee Ree ee eee 30 75 150 200 350, IDEN) Ube eran Seria RE eae tai Oya UebinigS a.at5 1.75 2.15 2.65 _ 3.40 4.40 Cement, Refractory (Vulcan Paste) Northrup. For use at the highest available temperatures. Ap- plied as a paste for stopping up cracks, sealing holes, as a protective covering to heating wires wound on cylinders or, when thinned according to directions on jar, as a protecting paint. It is very plastic and cohesive as a paste or paint, which on heating to 200° C or more, becomes flinty hard. It is very useful in many ways for high temperature experiments in the laboratory. Le y8)06 oh fh Geemarc acer Oy cain he ee caret crc ec Re aicie o:0%. 0.0 < 3.25 110 Agee fy iE, 'U) YR H. T, ShOe Mer FAL es CFO; VME Re AY FN VY: CEMENT TESTING APPARATUS POP vaAWE — RACLIEF VALVE No. 23756 CYLINOER BRIQUETTE RACK ASBESTOS [INSULATION = SuPPoRT No. 23752 No. 23776 23740. Autoclave Force, for Cement Boiling Test, with metal rack for holding briquettes. Inside dimen- sions, 12 x 7 inches; cover and clamps of special alloy steel; the cover is provided with a steam gauge registering up to 400 lbs., and also a pop safety valve which may be set to blow off at 300 lbs.; an angle relief valve is provided to relieve the pressure at the expiration of the test. The cover is fastened to the cylinder of the autoclave by means of a hinged clamp made in two halves; thus obviating the use uf any bolts for fastening, and, as the clamp encircles the entire evlinder, uniform pressure is exerted at the cylinder cover and the cylinder, thus insuring an absolutely tight joint. A rack for supporting the briquettes is supplied with the apparatus which is made most substantially and mounted on suitable support............... : : 100.00 23742. Burners Special torsRorcePAULocl aves aes eee eee en een ee eee Een eee soo ALD 23744. Cement Micrometer, for measuring the expansion of test bars subjected to the autoclave test. The head is divided so that the micrometer will give positive readings, irrespective of whether the test bars expand or contract during the time they are subjected to the autoclave test. The micrometer head is divided so that ‘the expansion or contraction can be measured to ypy,th of EY TEC 3 Rees EO Ane ROS OEIS Ete eee aS a eer ee Oo bobo toe Coen Ee aoe 35.00 23748. Cement Mould, of brass, for making test bars, with brass test bar which is ex: xactly 6 inches long at 70° F., for use in setting the micrometer before subjecting the cement specimen to test.... 6.00 23752. Briquette Mould, new model, according to the specifications of the American Society of Civil Engi- neers; by having different length rods the mold can be changed to take from 1 mould up to any number desired with no possibility of individual moulds springing out of place. In gangs of 3 Gnumoremouldswpecimouldesy, See. Seek Sk ees OS Se ae 2 eee ee Cee ss 3.50 23756. Briquette Moulds, brass, with end clamps, according to the specifications of the American Society FOGSMES tin gyVEa terials eas ater ets on. nn Reva aera «last atee cera ene res TS Seat : eee e250 23760. Briquette Moulds, same as above but with iron, horseshoe shaped ‘el: amp.. : ‘ 2.50 23764. Extra Clamp for Briquette Mould No. 23760... ............ : Sapo ob!) 23768. Briquette Moulds, improved form. for shaping sections automatic: ally without ‘rapping. According to the specifications of the American Society for Testing Materials 3.00 23772. Briquette Gang Moulds Number of briquettes. . Ee 2 3 4 5 oe | DEG ies aco ee mcreee oo eee 6. 00 9.00 12.00 15.00 18.00 23776. Cube Mould, of brass, one inch, per gang.......... By pense Hct, ke aes : eee rene ie 3.00 23780. f ns two “ Ey ce cece eins Bal toeator Genes aeaie soc ee a ae 4.00 111 23784. 23792. 23796. 23800. 65S wa No. 23796 No. 23800 Cement Testing Machine, Fairbanks Automatic, recognized as standard. Without springs or hydraulic apparatus, the action being automatic and entirely free from jars which tend to break the speci- men before its greatest efficiency has been reached. The tensile strength is generally accepted as the standard, it being less difficult to obtain fair comparisons than by other methods. 1000 lbs. capactty.-'Sizenl 2a024 inches! +..2524 4:51) ..5 352s oes eee Oe ee ee eee ee ee 110.00 Cement Testing Machine, Fairbank’s Improved Automatic. This machine is exactly like the above except that it is mounted on a sub-base containing a worm and worm gear connected to an axis which is threaded and passes up through the base, and hand wheel by which means a steady tension is applied to the briquette until broken. Recommended because of great increase in ten- sile strength of cement during recent years. Capacity 1000 lbs.......................... 160.00 Cement Testing Machine, Olsen’s New Automatic Shot form. The principal advantages of this machine are as follows: The machine is automatic to its full capacity and is not touched from start to finish of test. The instant the briquette breaks, the breaking load is read on the dial ef the scale. The load is applied with absolute smoothness, and impact from falling shot is eliminated. The cut-off on the shot kettle is practically instantaneous. All shot that has escaped from the kettle has already done its work and the column of falling shot in the air when the specimen breaks is, therefore weighed as it should be. A new grip which brings the strain uniformly on the specimen is used. The briquette hangs clear of the frame ef the machine, giving plenty of room for the hands when adjusting specimens. This is a widely used and thoroughly satisfactory outfit; 1000 lbs. capacity, length 24 inches. height; 262 inches;-weight'40 Ibs. sii fee. eawsceetsac.c-. lee amaaees nelestonrtae eee 125.00 Soundness Test Apparatus, Le Chatelier. A very convenient method................ RR oe. 3.00 Cement Sampler, for obtaining fine samples of cement from the center of a barrel............... 7.50 112 23804. 23808. 23812. 23816. 23820. 23824. 23828. 23832. No. 23804 No. 23804—Side View No. 23820 Vicat Needle Apparatus, Improved form. This apparatus does not require an extra compensating weight to give a downward pressure of 300 grams when the 1 mm needle is used (both needles are made of equal weight), thus obviating error because of overlooking the use of the compensating weight with the small needle. Complete with one mould. . : nae 16200, Extra Rubber Mould .. teh 5 BE anata aha nasties oS foes Fee ERO xtraiGlasseMouldece: . owe marten eon areas a aerate. asta, ac ehcicieve citeefereMets imei Me Says eisai a 1.00 Gilmore Needle, for determining both the initial and final set of cement. Consists of a steel needle js Inch in diameter with a} lb. weight, and a needle 5‘; inch in diameter with a | lb. weight.. 4.00 Gilmore Needle, same as No. 23820 but with vertical support to keep needle perpendicular to the surface of the pat. . : =o -00 MOMMY ; (Dy ea a ee No. 23828 No. 23832 Cement Scale, specially made to show the fineness of cement. Will weigh 1 lb. to .0001 lb. avoirdu- O56 GgboA BAe OOTOONE Ay ob nclar BA OMnCeCS OMrICO TD Sabino dc colinGc outs Uacids JOSH an UnMesoN ngs 13.00 Percentage Scale for fineness test, with beam divided to 16 oz. in } oz.; also with a second row of figures reading from 0 to 100%........... Aopen teete ioe Saree ae eee OOO, > ee) 4 Ts c wD a 4 ac fo) = > Wn fo fo) = 4°) > z ~ " OG) OQ No. 23840 No. 23844 No. 23848 No .23856 Cement Samples No. 23860 = SSS = —— No. 23880 No. 23868 No. 23876 23836. Volumenometer, Erdmenger-Mann, for the determination of the specific gravity of cement. A very accurate method, consuming much less time than the Le Chatelier, and highly recommended by leading cement engineers, complete with ten, flasks... 03.04 casac cused: Gee eee ee 35.00 23840. | Specific Gravity Apparatus, Jackson, for the true determination of the ‘specific “gravity of cement. Consists of a special burette with bulb and stopcock and a special flask with ground in funnel stopper of exactly the same bore as the burette. As described in the Journal of the Society of Chemi- cal Industry, 15 June, 1904. No. 11, Vol. XXIII...... Sonn Corer Meossedscss GLU) 23844. Specific Gravity Bottle, Le Chatelier, as used in cement PESELI Go oya.6re/tecsass les oie atesye ee ee 2.60 23848. Specific Gravity Bottle, Le Chatelier, New Form, in accordance with the U. 8. Bureau of Standards requirements and as used in the U. S. Government test for Portland Cement. See Circular No. 83 of the U.S. Bureau of Standards, without certificate............. OR Sms, 3 3.00 23852. Specific Gravity Bottle, as above, but with certificate of the U. S. Bureau of Standards............ 5.00 23856. Specific Gravity Bottle, Schuman, with tube graduated to 50 ce in ;pths........................ 2.50 23860. Permeability Testing Apparatus, for determining experimentally the exact ralations between the im- permeability and strength of concrete, treated by the integral method. The briquettes are cylindrical in shape, 3 inches in diameter and 2 inches high. A pressure gauge is attached to the main vertical tube for indicating the pressure under which the water flows. As constructed in the Structural Material Testing Laboratory of the Brooklyn Polytechnic Institute. Complete with one mol diay. sents cbs male soe bye cele id gaia ws wee One OREO ee ae eee 14.00 23862. Extragmould’ss-on- eee INSEE ODE Riya ro Fae .cees wage 6a Se eee 4.00 23864. ‘Cement:Sample Cans, ;per \doZeMe rye cicreis ot eveiere soon eistnte Sheree no 1.00 23868. Steaming Apparatus, for boiling and steaming test. Made of copper; 12 x 12 x 24 inches........ 30.00 23872. Glass Plate, for use with briquette moulds; (24°x 24 inches. ..:%...0,o2 es noe 3 ee eee 8.00 23876. Pan of galvanized iron, 24 x 24 x 3 inches deep........ atte : <4 sds see 2.00 23880. Brush of brass wire with wooden handle..... : 5b sohheré jy oeide dal oe hine eet eee -50 23884. Trowels, for making briquettes, etc. Sizer cent hn, eats eee eae eee on or ; 5 SE RAS DES Ke Small Large aC es or ee ee eee rae Gh G oe anos -40 -60 114 23908. 23912. 23916. 23920. 23924. 23928. 23932. 23936. 23940. 23944, 23948. 23952. 23956. 23960. 23964. 23968. 23972. 23976. 23980. No. 23908 No. 23924 No. 23932 Centrifuge, Bausch & Lomb, Hand, single speed, giving 1,200 revolutions per minute with fifty turns of the handle, the latter being so constructed as to render sudden stopping impossible. C omplete with two-arm sedimentation attachment and one graduated and one ungraduated glass tube 7.50 Centrifuge, Bausch & Lomb, Hand, two speed, providing for speeds from 1200 to 4000 revolutions per minute. Similar in construction to No. 23900. Complete with Daland’s haematokrit, auto- matic blood pipette, two sputum tubes and two-arm sedimentation attachment with one grad- uatedrand onesuneraduated) class: tubes sar. aciec gece -isrs 2 aes Soe ase se ares 10.00 Centrifuge, Bausch & Lomb, Electric, with rheostat providing five different speeds of from 750 to 2100 revolutions per minute with two 15 ce tubes. For operation upon ordinary incandescent lamp socket. Please specify voltage in ordering. Complete with two-arm sedimentation attach- ment and one graduated and one ungraduated glass tube. Fori@ircuit.... <2... o 110 v ole; wdiree t 220 volts, direct 110 volts. alternating, 60 eycles Hache adi 5.00 27.50 30.00 Access@ries for use with any of above Centrifuges. High Speed Indicator. . ; Be aOR Hoe : Meo aa oo Sacra cence . 1.50 Speed Indicator, autom: atic registering. . Sais arcl Shale a1 ARE BET Soe lne TEAS SES See nels ele ereleve ie iare ofersreyaeie 3.00 Two-arm Head, for 50 cc tubes, with aluminum shields and one graduated and one ungraduated tube, 50 ce.... aoe aire eee 8 eRe: : BAe Stn Seo DORE eee 4.50 Four-arm Head, for 15 cc tubes, with aluminum shields and one graduated and three ungraduated tubes, 15 ce BSE eaaaear thats: sie a teree ‘ Neos aontchceias nO ac OOo Aee 4.50 Bloodifancet, Mooresaltomaticsstt,eeccniten «it ocanseiieies caren se ethe eane eee RRA REOaS so Jest) Haematokrit, Daland, with two percentage and two sputum HUES eee ee So conto CoD ea) Milk Tube, for determining percentaperohitats| 7 .).<, ow +. S 50 cc. bi oleslelevensvedeteietoredteleae A ilicratne sets 6 cn binge Sta ooUeM on 75 2 re ee MUNETACUsbeU sO CCe. aman. aise NAG ete Bee Ree segs ees 5 ol om - on oe BOC Os ry fahecy clever aieheystee eo tack idoybgd sone Coneaaaee: we Aluminum Shield, tosholadsdiecrelass tube!....<- soca 7 is ea eden Sennen © pent hs Ege a 25 soe a ONC Conc se cad Fhe Welsie ere ESET a : Srcnce foe a!) Sputum Tube, for haematokrit, ungraduated..... Jeas Ee aes eis, OO Metallic Guard, for use with Electric Centrifuge No. 23908. ; 2 “A CG ee eee 7.50 23984. 23988. 23992. 23996. 24000. 24002. 24004. 24008. 24012. 24016. 24020. 24024. 24028. 24032. 24036.. 24040. 24044. No. 23996 No. 24008 No. 2 No. 24020 No. 24024 No. 24028 No. 24032 No. 24036 No. 24040 Centrifuge, Water Motor, Arthur H. Thomas Co. Special, with protected bearing which cannot become rusted and from which the oil cannot become washed out by the water. For attachment to any ordinary faucet by means of patent hose connections. The speed is under absolute control by merely turning on or off the flow of water. Runs absolutely noiselessly and may be left going constantly without attention. Each machine is furnished with necessary aluminum shields, 4 ft. of pressure tubing and patent hose connection for faucet. With patent hangers which support the aluminum shields at the lower part of the pointed ends, which obviates stripping of the lip of both aluminum and glass tubes when tubes are hung by the lip. With 2-15 ce tube holder and one each plain and ‘graduated glass tubes), 151c¢. «02 2. ae> ee iae e e 8.00 Note.—It is assumed in listing the accessories for our Water Centrifuge that the 2-15 ce tube head with aluminum and glass tubes will be desired and it is, therefore, necessary in order to secure the price of any special outfit simply to add the price for the various heads. If the 2-15 cc tube head included in the regular outfit is not desired a credit of $1.00 is allowed when special outfits are made up. Accessories for Water Centrifuge. Four- arm Head, with patent hangers, for 15 ce tubes, w ithout shields or glass tubes Rein incen/ac 6 ot 2.75 : BOE ee TO CC Te ee 3.75 Two-arm * “ if ‘ SOOM eis : es at tis BERR co occ.ncc 200d) Lactokrit, Stewart, for estimating the number of pus eels and the character of bacteria and insolu- ble matter contained in milk. Complete with 20 glass tubes and stoppers.............-- 7.50 Extra Glass Tubes with rubber stoppers and nipples, for use with above. Per dozen..... 1.50 Rotating Metal Guard, for water centrifuge, 14 inches in diameter by 3 inches deep. The whole hood rotates permitting much greater speed than the ordinary he: ad and eliminating the danger of tubes flying off during operation. With shields for, tubes Bl A Sed AE fey Geis: eh; SPER AE SIN AA 415ce 6-15ee 8-lice DEG Ue ihiee In Sree DISARM ce Capea cio icin CRIES MCRCR eT Mes sty cron 9.00 10.00 11.00 Two-arm Head, Goetz, for phosphor determination in steel analysis, without tubes.............. 7.50 Goetz Phosphorous Tube, glass, graduated and with glass stopper...:............0)00sse hee 1.00 «“ “ungraduated and without glass stopper...............-...++-5-- 40 Aluminum Shields for 15 ce glass tubes Ee ee Siti: eRe et ris: MP Rr si 08 con kn 25 SS sce ONCCHMES : 5 tiga iii wal he ae -50 Glass ¢ entrifuge Tube, ungraduated, 15 ce Jicunie dais ageed sates 1 oe 15 w SOLCChee. ea aoe ton PRE I A lac -30 ss os vs) 4 ar [= Dv H. L .2hin .O)- Me Ares GC, -.O- Me P= Ar oN Y Accessories for Size 2 International Centrifuge. Accessories listed under the Size 1 Centrifuge, p. 118, may also be used with the Size 2 machine when desired and, in addition, the attachments of larger capacity, and for special purposes as listed below. No glassware is included in price for attachments. 24188. Head, S-tube, ¢ arrying 100 ce, 50 ce or 15 ce tubes or Babcock bottles, without tubes............ 10.00 24192. Combination Head, 8-place. carrying 2-200 ce tubes, or 2-150 ce tubes, or 2 Squibb’s funnels or 2 Goetz tubes, and 6-100 ce tubes, or 6-50 cc tubes or 6-15 ce tubes or 6 Babcock bottles, without cups or tubes: 325225, 525 6os sci sacs s tos cocek came coe tees eee en ee ee ee eee 13.50 24196 Head, 4-place, carrying g either 4-200 cc © cups | or 4-150 ce Squibbs funnels, without cups.......... 8.00 24200. “ 16-tube, carrying 16-50 cc tubes, or 16 Babcock bottles, without cups or tubes........... 16.00 24204. Metal Tubes, 100 CT: Cel ¢ ee i ee SE aN LN oe ee le Oia stance dane 75 24208. TFrunnion Rings, 100/cc:ieach.---- 2... | .....22 9s a eee 2 TOS Se 35 24212. Metal Tubes, 50 cc, each... ae ae 2 — 2 le ee ee 55 24216. - Trunnion Rings, 50 ce, each.. ane Ohare os hick Ghiskt a a eae oa ae ee 35 24220. Metal Tubes, 15 cc, each.. : wate Sob oo Ua ehepe:d ose SE NR ee eee 45 Z AS —‘Trannion) Rings,l5\ce: each.-.. 2... --2 sen Def hey yFus sito: ee ee sc ags tard ae 40 Glass tubes, with lip, 100 cc capacity, per dozen......_-..<--.---22-00e ee lence cece eee eee 1.75 Centrifuge, International, with Soil Analysis Equipment, consisting of Size 2, Type B Centrifuge, with a speed of 1200 revolutions per minute, and equipped with a ‘speed control rheostat, 8-tube head, eight 100 ce metai tubes and rubber cushions, 3 gross 100 ce glass tubes and an eight tube rack for the bench. . 110 volts, a. c. 220 volts, a. c. Gurrenteccc. - oss e6 110 volts, d. c. 220 volts, d. c. 60 cycles 60 cycles ach rre ees. : 80.00 84.00 101.00 104.00 24236. Centrifuge, International, with General Laboratory Outfit with special reference to bacteriological and serologic al work where large quantities are to be handled, consisting of Size 2 Centrifuge with speed control rheostat, S-tube head, eight each of 100, 50 and 15 cc metal tubes and two dozen each of 100 ce, 50 ce and 15 ce plain glass tubes. 110 volts, a. c. 220 volts, a. c. Current. See. 2 =. seaeec ___ 110 volts, d. e. 220 volts, d. c. 60 cycles 60cycles Size 2, Type A.... ah 102.09 106.00 : WypeiBy.2--oces 136.00 140.00 136.00 136.00 Note—For Size 2 Centrifuge fitted with 16- and 24bottle Babcock heads. see Milk Analysis Appa- ratus, p. 347. 24240. Centrifuge, International with Food Analysis Equipment, consisting of No. 24192 Combination Head, S-place, for 2 Squib b’s funnels and 6-50 ec tubes, 2 Squibb’s separatory funnels, 150 ee, 1 dozen glass tubes 50 cc, 3 dozen metal tubes 50 ce, 4 2 dozen Trunnion Rings for 50 ce tubes, and two carriers for Squibb’s separatory funnels. 110 volts, a. c. 220 volts, a. c. Current. .... --- 110 volts, d. c. 220 volts. d. c. 60 eycles z 60 cycles _ Size 2, Type AS BAG 88.90 92.90 : ‘Type(B=---- 122.90 126.90 122.90 122.90 No. 24244 No. 24252 24244. Centrifuge Cyclone, with perforated drum, for separating precipitates and crystals from their mother liquors. Widely used by sugar chemists for the determination of the yield as well as purity test. With bronze basket, 43 inches in diameter, with crank for hand power driving.... 50.00 24248. Centrifuge, Cyclone, same as above but with pulley for power driving. ........ Becsecesssec 32 Flt) 24250. Hard Rubber Basket for handling of material which must not come in contact with the metal 24252. Centrifuge, Cyclone, same as above but soo ier and larger, with metal basket 8 inches in diameter with crank for hand power driving).-- 2.20.6 266 oe ws ns sce eee ee Sen eee oo. aoe 100.00 24256. Centrifuge, Cyclone, same as above but with pulley for power driving......................-- 100.00 24258. Hard Rubber Basket for above............... Shiees seer ods tose 0c See ee 10.00 120 = No. 24260 24260. Centrifuge, Large Universal, with independent drive; for serological and bacteriological work where large quantities are to be handled as in separation of blood serum. Especially adapted for centrifuging a large number of small specimens at one time with head No. 24312. The variety of heads adapted for use with this machine permit its application to most lines of laboratory work requiring the use of a Centrifuge of high speed and large capacity, as in steel, rubber, sugar and oil analysis and the separation of ery ystals from their mother liquors. The prices given include regular head as illustrated on next page under 24260—Regular Head with metal cups of the capacities indicated and one dozen special heavy glass tubes and endless camels hair belt and speed indicator, but without motor. Capacity, tubes.......... San 6-50 ce 6-100 ce 6-200 ce 6-300 ce 6-400 ce 6-500 ce Rev olutions per minute... : 3000 4000 4000 3000 3000 3000 Horse power required....... 2 1 2 3 4 5 Centrifuge, without Motor Duty Breen 58.10 115.00 233.00 284.00 358.00 386.75 Duty Paid 67.20 132.00 267.00 325.00 410.15 443.50 24264. Electric Motor, only for above Centrifuge, direct, current, with starting rheostat. Horsepower...... Se anes Br. ; ; 1 2 3 { 5 Duty reese ses as: so) (herd) 115.00 178.25 228.80 260.00 284.00 Dutvallealdies se. cos cens os . 86.00 130.00 202.50 260.00 295.00 322.50 Centrifuge, Large Universal, as in No. 24269 but for different purposes as indicated by the respective heads. The machine supplied with these heads is the smallest size of the above series, i. e. that for 6-50 ce tubes, with the exception of heads F and H with which the centrifuge for 6- 100 ce tubes is supplied. For motor prices see 24264. Head A, with revolving sieve of hard glazed porcelain enclosed in a porcelain jacket with spout. The bearings are entirely protected from the liquid. The maximum speed permitted by the strength of the pore -elain is about 2000 r. p- m.; diameter 140 mm. Head B, with revolving sieve of heavily tinned copper, for separating crystals from their mother liquors, ete. May be used at a speed up to 3000 r. p. m. On special order these sieves may be furnished with ebonite lining, silver plating, lead lining, etc. Head C, for the examination of rubber according to the method of Frank-Marckwald, for the purpose of separating rubber and other organic compounds from the mineral filling mate- rials without filtering. This outfit is supplied with two heads, one for 4 glass stopper red cylindrical glasses and the other for 4 Erlenmeyer Flasks. Head D, for sugar analysis after the method of Zimmerman, as used in the Royal Institute for Sugar Testing, in Berlin; for the determination of the quantitative erystals in raw sugar, the caleulation of the yiek 1, the calculation of the adherence of the syrup and the quali- tative examination of sugar crystals for size, color, ete. The metallic cups are furnished with two circular sieves and one felt plate. Head E, for testing mineral oils for water, dirt, ete.; for 4-50 cc tubes, the cylindrical lower part of the tube being graduated in percentages; maximum speed 3000 r. p. m. Head F, same as Head E but for 4-100 ec tubes. Head G, for Goetz phosphorous dete ‘rmination ; for 4-50 cc tubes. Head H, “ “4-100 ce fe 24268. Centrifuge, without Motor, with Head A B (e D E F G H Duty ree... s+. ae : 106.50 106.50 124.10 124.10 115.30 175.00 98.10 160.00 Duty Paid....... 122.20 122.20 142.20 142.20 132.20 199.50 112.20 182.00 121 Special Head for Serum Work 4312 9. No. Regular Head No. 24528 Head B 260. 24 No. 268 Head A Mf 9. No. 4268 Head C 9. No. No. 24268 Head E and F No. 24268 Head G and H 99 lie lee WU UR ale a ie O RMee AS GO M PF AN i 24316. Accessories for the Large Universal Centrifuge as above. Porcelain Perforated Drum for Head A, 175 x 140 mm......... RCE Bane 18.00 a oOutsidenacket tor Head Ay 240k 210mm 6.3) ook ces csc dene eile co can f 24.00 GlassiGylinders'forsiteady © x50) cevcapacity: <<... a seneseenn ose en Me dcee cn: -60 Metal Cups, each with two circular sieves and one felt plate, for Head D, each... 1.25 Felt Dises, per 100......... 7 fotdOte CRA Cn Een Mmm Se homeniboda otis bGida ae doe ene 2.50 Graduated Glass Tubes, for Head E, 50 ce capacity, each..................... 1.15 as s ef =) F, 100 ce s CAChii ents anes re tees ; . 1.80 Us Se < i “ _G, 50 ce § each.... Sh A Aone Ae eee =o 516% & < s ef a EL OOKce ac LACH eee ee eee Son lee ne 1.13 Gasplabestionmabove CACHeee...5). = 55.6.0 5 ob cis bie See Si Oe eee eee 10 Numberofi hubes...--.0...s<-5. ee te : eee aie oh : 72-10 ce 144-10 ce Duty Free!:.....: :- A ; een aoe, 80.00 100.00 LDA LENG Lo: onade Ghto Gn oad HOSE EEE ae SoBe ames wee Me see 93.50 112.50 Centrifuge Tubes, of heavy well-annealed glass, cylindrical, with round bottom, for use in head illus- Canaeitips COmcerestet nae aa tek see secs ee 50 100 200 300 400 500 Each=...... - Soh 0d See 80 ~©~—*1.10 1.25 1.75 2.00 24320. 24324. 24328. 24332. No. 24320 Centrifuge, Electric, High Speed, Konig, designed especially for serological work. With heavy armour plate cover and separate motor, all mounted on the same base board. A regulating resistance permits the reduction of speed from the maximum of approximately 8000 revolu- tions per minute to about 2000. With speed indicator as shown in illustration. Prices quoted are for motors for 110 volts direct current. For motor for 220 volts direct current prices are increased $5.15 duty free and $6.85 duty paid. For alternating circuits, both voltage and number of cycles must be given and price will be quoted upon application. @anacityyes weak canine 4-15 ec tubes 6-15 ce tubes 4-30 ce tubes 6-30 ce tubes Dutyibreevs. cose een. 130.00 150.00 150.00 171.25 Duty*Paids.e. 0: secs 157.50 182.50 182.50 207.50 Special Glass Tubes for use with above centrifuge. GAA CLM ECON ete ae aR eee en Ta, Te SR Te pars erste forces ee 15 30 LOA Toc OR ERR BOB Ge tmkine BER Oo tn OG SEA eee noore ceca rr7s ae -20 40 load and of 3000 to 4000 r. p. m. with a heavy load. In order to secure lightness, strength and absence of rusting, the rotor, buckets and tubes are made of Duralumin, an aluminum alloy having the strength of steel and only one-third its weight, which Prof. Delepine has selected after testing several metals and alloys and ascertained that it was capable of resisting the stress to which it had to be submitted. This metal is but slightly affected by organic fluids such as milk and has little action upon the bacteria. He has, therefore, designed tubes of Duralumin to take the place of the glass tubes generally used. These tubes are practically indestructible and, therefore, eliminate the loss of material due to breakage of the tubes, and also permit of certain adaptations which are not possible with glass. The centrifuge consists of a Duralumin rotor of special shape allowing the maximum number of tubes to be used and securing, when the dise or rotor is rotating rapidly, the most advantageous position of the tube in regard to equi- librium and safety. For 16 tubes of 100 cc each. These tubes have flat bottoms, for standing without support, and have consecutive numbers from 1 to 16 stamped upon them. Complete, without motor. Ut yVAR eG? foie tarajaetoresins sinyeaisicls 435.75 Dutyebaidee ee eases ees oae D2eg0 Duralumin Tubes, 100 cc capacity. Dntyihree; Cac. o-<5- os oasecisee a 4.65 Dutyphaidweachtes ie -cchice ee es o 5.60 123 - 24400. Chart IX No. 24400. Chart UI 24400. Charts, Tabulae Anatomicae, Lendenfeld, a comprehensive series of large charts covering the whole range of human anatomy, in finest color lithography after hand drawing, with explanatory text. The charts are 207 em high by 74 cm wide. Chart Integument (Skin and hair follicles, various sections). Structure of Bones, Cartilages and Teeth (various sections of cartilage and lower molar teeth, femur, etc). Skeleton (Anterior view). (Posterior view). Skull (various views). Parts of Skeleton (Vertebrae, hand, foot and hyoid bone). Connective tissue, adipose tissue, ciliated epithelium. Muscular Tissue (various muscles). Muscular System (anterior view of the superficial muscles). ( sf deep-seated ODE (posterior view of the superficial muscles). “deep-seated es). Muscles anal Tendons of the Hand (superficial and « ieep-seated muscles of the palm and back). Nervous System (anterior view). Brain (various views). Cerebrum. Parts of the Nervous System (spinal cord, ganglion cells, nerve fibres, motor endplates). Organs of Taste and Touch (tongue, taste buds, various corpuscles, free nerve endings, etc.). Eye, Nose and Nasal Sinuses. Retina (transverse section). Ear (left inner ear, cochlea and diagrammatic section). Ear (transverse section). Organs of Circulation and Respiration (Femoral vein, blood capillaries, blood corpuscles, lymph spaces, artery, trachea. terminal bronchus). Heart. Arterial System (anterior view). Venous and Lymphatic System (anterior view of the venous system and lymphatic plexus). Lungs and Abdominal Viscera (anterior view) and Organs of ‘Digestion (frontal view). Organs of Digestion (wall of the intestines, epithelium of the stomach, salivary gland, pancreas, liver) . Organs of Digestion, Urinary Organs and ductless glands. Ductless Glands and Male Genitalia (spleen, adrenal, thymus, thyroid, testicle, spermatozoa). Male Genitalia. Female Genitalia (anterior view of the ovary, section through the ovum). Situs Viscerum (median view of the head and female trunk). XXXII. Gharta! as-above, each duty free. 5. 5.5 <.sciticcs,c.0.e-o ci cies oon mnie ai eva velsiwie oye sete ee 3.60 complete set of Charts Nos. I to XX XIII, inclusive, duty free........ 118.80 124 Tafel 1 Pathogenic Bacteria. Pathogene Bakterien. Bacteries Pathogenes, Capsules Sheaths Capsules Gaines Giles i Kapseln Scheiden Geisselu No. 24404. Series I, Chart 3 No. 24404. Series II, Chart 3 24404. Charts, Bacteriology, Lucksch, a series of 18 charts, with accompanying text in German, English and French, carefully executed in colors. Series I consists of 6 charts 81 x 110 cm devoted to General Bacteriology and Series II consists of 12 charts, 80 x 106 em, devoted to Pathogenic Bacteria. Series I Chart No. 1. Forms of Bacteria. x 2. Structure of Bacteria Cells. y ee «3. Capsules, Sheaths and Cilia. ss sf “4, Division Gonidia. a is “5. Reproduction by Spores. - ss “6. Ramification. Forms of Involution. Plasmoptysis. Series II, Chart No. 1. Bacillus typhi abd. Agglutination Bacteriolysis. Phagocytosis. . 4 “2. Staphylococcus pyogenes. Streptococcus pyogenes. Micrococcus ca- tarrhalis. Micrococcus tetragenes. ie rf * 3. Micrococcus gonorrheae. Micrococcus meningitidis. Diplococcus pneu- moniae. Micrococcus melitensis. 5 ss “4. Capsule cocci. Bacillus capsulatus Friedlinder. Bacillus anthracis. s oe “5. Bacillus tetani. Bacillus Chauveau. Bacillus oedematis maligni. Bacillus botulinus. ss _ “6. Bacillus aerogenes Welch. Bacillus pyocyaneus. Bacillus typhi abdom- inalis. : “7. Bacillus diphteriae. Bacillus tuberculosis. Bacillus leprae. : uy “ 8. Bacillus influenzae. Bacillus mallei. Bacillus pestis. Bacillus chol- erae gallinarum. a p “ 9. Bacillus suisepticus. Bacillus suipestifer. Bacillusrhusio pathiae suum. S “10. Aktinomyces. Bacillus necroseos. Bacillus ulceris mollis. ss s “11. Bacillus fusiformis. Vibrio cholerae. Spirillum gallinarum. i : “12. Spirillum febris recurrentis. Spirillum framboesiae tropicae. Spiro- chaete pallida. Charts, as above, Series I *(Gicharts)),punmounted termes ee cc cecitrsrrce = ste ieesrsn cretion ic 9.00 cs ss ome ec mounted on linen with rollers...................- 13.50 os WY a Series Lin 2charts) unmounbediaer seer eitcitrd elt ticterits tel eletet= 18.00 fe o. oe Saas: mounted on linen with rollers........... eeeeeat-00) 24408. Charts, Bacteriology, Roux. These charts are prepared in the laboratories of the Pasteur Institute, Paris, and are carefully reproduced in colors. They are lithographed on heavy paper S80 x 62 em with edges bound and with eyelets for hanging and are accompanied by explanatory text in English, French and German. l. Bacteria. 10. Anthrax—kidney. 2 ae 11, Chicken Cholera—blood. 3. Moulds. 12. Erysipelas—blood of pigeon. 4. Anthrax—colony on gelatine. 13. —liver of pigeon. De «“ —formation of spores. 14. s —spleen of pig. 6. ss —blood. 15. Staphylococcus—culture i in bouillon. ih —spleen pulp. 16. Streptococcus—culture i in bouillon. 8 « —omentum. 17. —kidney. 9. a —liver. 18. Pneumococcus—culture in gelatine. Continued on next page. 125 “0 AS IRY a hile Hi. Tee jal (9) Ay oS Cee OR le OAS Charts, Bacteriology, Roux (continued). 19. Pneumococcus—blood. 43. Diphtheria—culture on coagulated serum. 20. : —capsules, positive and negative. 44. e —smear from fossiel membrane. 21. Plague— 45. s —section of trachea. 22. “ — culture. 46. Septic Vibrion—flagella. 23. «« —blood from spleen. 47. se «““_—peritoneal exsudate. 24. ““—smear from buba. 48. Symptomatic Anthrax—peritoneal exsudate. 25. “"_—omentum of rabbit. 49. Tetanus—bacillus with flagella. 26. “ —liver. 50. « “ —culture with spores. 27. Bacillus Typhosus—fiagella. 51 ««__—spores in phagocytes. 28. iS “ —spleen. 52. Cancer—development of archoplasm. 29. Cholera—vibrions. Flagella. 53. “_—spermatogenesis of guinea pig. 30. Recurrent Fever—blood. 54. “ —pseudo-coccidia. 31. Gonococcus—pus. 55. Small pox—cornea of rabbit. 32. Tuberculosis—reaction in omentum. 56. ee “ _pustule in skin of monkey. 33. ae —aviare, spleen of rabbit, giant cells. 57. Coccidia in rabbit—life cycle (schematic.) 34. Tuberculosis—initial intravasculary phagocytosis. 58. « ae ““ —adenoma of liver. 35. if —intravasculary tubercle, 12th day. 59. Malaria—haematozoan in fresh blood. —__ 36. a —perivasculary tubercle (kidney) 25th day. 60. c= ce “ blood after staining. 37. # —ramified bacilli. Yellow degeneration. 61. «__ —development of Haemamoeba relicta in mos- 38. by —encysted bacilli. Spleen of rodent. quito. 39. a —sputum. 62. « —Anopheles and Culex. 40. Leprosy—section of skin. 63. Trypanosoma in rat—division. 41. Glanders—pus and section of lung. 64. us “ “agglutination. 42. Actinomycosis—phagocytic reaction. 65. “ “ tse-tse fly—division. Charts, complete set as above, duty free Drosera rotundifolia L. No. 24412—Kny Botanical Chart No. 24416 24412. Charts, Botanical, Kny, on heavy chart paper, printed in colors, 69 x 85 cm, with explanatory text. The old series consists of 100 charts in sections of 10 charts each (excepting sections VI and VII), each section being furnished in a portfolio and sold only by the section. For the new series see No. 24416. Section I, Charts I to X, in portfolio, duty free.......... ila maaus aelete ree eee mmmnceccrics (CAN) I. Structure of the living plant cell and arrangement of its most important elements; the two chief kinds of protoplasmic movement inside a closed membrane, rotation and circulation and transition between the two. II. Structure and development of the starch grain. III. The chief forms of Calcium Oxalate crystals. IV. Chief stages in the conjugation of a large species of Spirogyra. V. Milk cells of Euphorbia splendens and Lactuca sativa L. VI-VII. A few of the most important forms of one-celled hairs. VIII. Longitudinal section through a dicotyledonous vascular bundle. IX. Vascular bundle from the interior of the stem of Saccharum officinarum L. X. Development of the embryo of Brassica Napus L. Section II, Charts XI to XX, in portfolio, duty free........... ieee are sic suoreneeere Paneasonce. (eZ XI. Structure and development of the epidermis of Ficus elastica. XII. Portion of a transverse section of a leaf of Pinus Laricio. XIII. Stoma of Thymus Serpyllum, surface and transverse section. XIV. Transverse section through the vascular bundle of the petiole of Polypodium vulgare. XV. Part of a transverse section of a three year old twig of Tilia parvifolia. XVI. Transverse section through vascular bundle from the stem of Cucurbita Pepo. XVil. Medium longitudinal section of the rapidly growing root-tip of Secale cereale. XVIII. Transverse section of a well developed radicle of Secale cereale. XIX. Development of the ovule of Oenothera biennis. XX. Ovule of Viola tricolor immediately after fertilization, drawn in median longitudinai section. 126 AD OR] a Sil Wk SR Ee Tah O} Mt ALS G © Charts, Botanical, Kny (continued). Section III, Charts XXI to XXX, in portfolio, duty free XXI. XXII-XXIIT. XXIV-XXV. XXVI. XXVII. XXVIII. « “ «6 « XXIX. XXX. Development of Peronospora calotheca de Bary. Development of Mucor Mucedo L. Development of Puccioia graminis (Pers). Reproduction in the Florideae,—Nemalion multidum (Web. and Mobr.). a us —Lejolisia mediterranea (Bornet). —Dudresnaya coccinea (Poir). Dev elopment of the tip of the stem of Hippuris vulgaris L. « _“ Flodea canadensis (L. G. Rich and Michaux). Section IV, Charts XXXI to XL, in portfolio, duty free XXXI. XXXII-XXXIIT. XXXIV-XXXV. s * Penicillium crustaceum L. (Fries). XXXVI. se g the Fuca uceae— Apial growth of Pelvetia canalicuta. XXXVII-XXXVIII. a3 td —Fertilization in Fucus vesiculosus L. XXXIX. Heterogonous dimorphism in the flowers of Primula elatior ( (Jaeq. ). XE. G trimorphism in the flowers of Lythrum salicaria L. Dev elopment of Rivularia bullata (Poir). “ Burotium. Section V, Charts XLI to L, in portfolio, duty free XLI-XLIV. XLV-XLVIII. XLIX. Dev elopment of Claviceps purpurea (Fries). “ Botrydium granulatum L. Transverse section through a vascular bundle showing soft bast divided into two portions from the middle part of the petiole of Chamaerops humilis L. L. Reduced vascular bundle from the stem of Elodea canadensis (Rich. section. & Michx.) in transverse Section VI, Charts LI to LXV, in portfolio, duty free LI-LI. Anatomy of tne wood of Pinus sylvestris L. LIV. Transv erse sec tion through the central cylinder of the root of Asparagus officinalis L. LV. s “ Musa sapientum L. LVI. a a se oh) Me s “ the root of Vicia Faba L in the beginning of secondary growth. Transverse section through the central cylinder of the root of Vicia Faba L showing advanced secondary growth. Dev elopment of the periderm in young shoots of Sorbus Aucuparia L. LIX. * “ bark in one year twigs of Vitis vinifer L. LX. se « « « “ young stems of Quercus sessiliflora Sm. LXI-LXII. ws “ “ Jenticels in twigs of Syringia vulgaris L. LXID-LXV. s « “ Sphaeroplea annulina Ac. var. carassisepta Heinr. Section VII, Charts LXVI to LXXX, in portfolio, duty free......................00ceceeene 15.00 LXVI-LXVII. LXVIMI-LXXI1. LXXIV-LXXVI. LXXVII. LXXVIII. LXXIX. LXXX. Development of the embryo of Alisma Plantago L. Structure and development of the Lichens. Structure of the wood of Quercus sessiliflora Sm. Apical growth and branching of Delesseria alata Huds. Cell division in the young stamen-hairs of Tradescantia virginica L. Secondary growth in thickness of the stem of Dracaena Draco L. Concentric vascular bundle from the zone of secondary thickening in the stem of Dracaena Draco L. Section) Vill, Charts) LXxkl to XC; in portfolio; duty freer... -oscceeece eee as = 12.00 LXXXI-LXXXMl. Developmental processes in the embryo-sac of Monotropa Hypopitys L. LXXXIV-XC. Structure and development of Marchantia polymorpha L. Section EX; Charts x Cl toi@; 1m portfolio, duty freeware er etelietereiicleloneioteereiekeielet=ralerolel 12.60 XCI. Structure and development of the grands of lupine. XCH. Pollination of the flower of Aristolochia Clematitis L. XCIII-C. Development of Aspidium Filix-mas Sw. 24412. Complete set of 100 Charts, as above listed, consisting of 9 sections, duty free.................. 96.00 24416. Charts, Botanical, Kny, New Series. These charts are larger than the old series, i.e. 106 x 150 cm and, while published in sections of varying numbers, are also sold separately. See illustration, page 126. ; Section X, Charts Nos. 101 to 105. 101. Drosera rotundifolia. 102. Mimosa pudica. 103. Spirogyra setiformis 104. Cuscuta Trifolii. 105. Berberis vulgaris. Section XI, Charts Nos. 106 to 110. 106 and 107. Dionaea muscipula L. 108. Centaurea Jacea L 109 and 110. Mucor Syzygites de Bary. Section XII, Charts Nos. 111 to 115. 111 and 112. The honey substitute of Orchard Flowers, Maxillaria rufescens, Stan- hopea graveolens and Stanhopea oculata. 24416. 24418. “ “c Charts, Kny, New Series, as above, unmounted, per section, duty free Gach; duty*freew es. ccccuin« sa cimensc osomecmoels Charts, Kny, New Series, mounted on linen with rollers, per section, duty free................ . 15.00 “ “ce “ Section XII (continued). 113 and 114. Internal structure of the Sun- and Shade leaves of the Red Beech (Fagus silvatica L.). The Plasmodium of Fuligo variana (Aethalium septicum). Section XIII, Charts 116 to 120. 116 and 117. Batotopaic and Endotrophic Mycor- iza. 118, Surface Modelling of Spores. 119 and 120. Apical Growth of Roots of Phanero- gams. 115. each duty frees ss os. occ eilas- cere srocrsine 3.30 A Hy: wo agl © 24420. No. 24420—Frank and Tschirch, Botanical Charts, Plant Physiciogy, Frank and Tschirch, printed in colors upon heavy chart paper, 69 x 85 em, each with explanatory text. ) section being furnished in a portfolio. These charts are furnished in six sections of 10 charts each, each They are sold only by the section. Section I, US Tito):X; in portfolio, duty free)... ee eee 9.00 Zones of growth in dicotyledonous plants rf Root hairs. Ill. Mechanical tissue in monocotyledons. IV. Germination of corn. V. Potato tubers. VI. Origin, growth and separation of starch grains. VII. Structure of the leaf of Beta vulgaris (common beet). VIII. Appearance and division of the stomata. 1X. Forms of stomata. X. Mycorhiza of trees. Section Il; Charts XI to XX,.in/portfolio; duty free... ..25.... 22554. 5.0) salen 9.00 XI. The cell. XH. Multiplication of cells by division. XII. The growing point and growth of the stem. XIV. Cholorophyll grains. XV. Spectra of chlorophyll, xanthophyll and of living leaves. XVI. “ “ alcoholic solutions of green and of etiolated leaves. VERS ys oung stems of Helianthus annus (Sunflower), first appearance of the ducts. XVIII. “ enlarged. XIX. Older stem of Helianthus annus in transverse section. OS eS « “Helianthus annus, enlarged. Section III, (Charts XXT to XXX, in portfolio; duty frees....--........ 2-2. enna 9.00 XXI. Germination of the pea. XXII. Stem of Linum usitatissimum (flax) in cross section; mgidity by mesns of wood and bast ring. XXII. Growth of a stalk of rye. XXIV. Fibro-vascular bundle and starch sheath of corn. XXV. Stoma of beet leaf, i XXVI. se 2 XXVH. Origin and appearance of root hairs. XXVIII-XXIX. Division of the nucleus. XXX. Chromoplasts. Section LV, Charts XXXI to -X2L,,im’ portfolio, duty free.......1.-+. oes. ose ee eee 9.00 XXXI. Germination of flax. XXxnl. Root~ tubercles of the lupine. XXXII. “« “ pea. XXXIV. Bacteria and symbiotic fungi of the Leguminosae. XXXV. The entrance of the symbiotic fungus into the lupine. XXXVI. Gs “SS pea. XXXVI. Root tubercles of Phiasestas nanus. XXXVII. Daily period of growth. XXXIX. Ring ducts. XL. Spiral ducts. Section V,. Charts) XLI tol, im) portfolio; duty free... 2-2 5.62 2-2 oe eee . 9.00 XLI-XLIV. Forms of starch grains. XLY. Transition from the primary structure cf the root to the secondary and throwing off of the primary rin XLV1. Periderm (cork and cork formation). XLVII. Cork of the tubers of Solanum tuberosum (Potato). XLVI. Callus of wounds and leaf scars XLIX. Root sy stems of the Dicotyledons (lupine, mustard). Me “ —““ Monocotyledons (rye). 128 A Wo clal (Uh drs H. he JE OM IME “ANY CS CAVOe Mis ePe vA N aYG Charts, Plant Physiology, Frank and Tschirch (continued) Section VI, Charts LI to LX, in portfolio, duty free......................... a otro 9.00 os Cambium ring and growth in thickness of the wood of trees, 1. 3 rr Ca va en rear papers, manta . Epidermal cells. LIV. Cuticle and cuticular seed tissues. LV. Relation of nitrogen to the cycle of plants. LVI. Aleurone grains. LVII. Schizogenous secreting ducts. LVI. Oil tubes of the fruits of the Umbelliferae. LIX. Secreting glands of the Labiatae and Compositate. LX. “in hemp, hop and cistus. 24420. Complete set of 60 Charts, Frank and Tschirch, duty free............... eerste : eRe 0400 24421. Charts, Plant Physiology, Errera and Laurent, consisting of a set of 15 charts printed in colors, 70 x 85 em, with explanatory text in French, German and English. These charts cover all of the more important phenomena in Plant Physiology such as root nutrition, leaf respiration and trans- piration, fermentation, animal nutrition, growth, geotropism, heliotropism, climbing and creep- Thay, GG THEW ECU CMa CS Fs Sa eo dees Oona aceon dees Bis Ais Aled 231s HS Cee 15.00 24422. Charts, Plant Pathology, Tubeuf, colored reproductions, mounted on linen with rollers. and each chart accompanied by explanatory text. Series I, consisting of Charts Nos. 1 to6, inclusive, each 80 x 100cm, per set of six, duty free 12.40 1. The Mistletoe (European) (Viscum album L.). 2. The Fusicladia of Fruit Trees. (Scab Diseases ) 3. The Toothwort (Lathraea Squamaria). 4. Erisiphaceae (Mildew fungi). 5. The Rusts of Grain, I. 6. “ce “ “ “ Il Series II, consisting of Charts Nos. 7 and 8, each 80 x 120 cm, per set of two duty free.... 5.10 7. Smut Diseases of Grain I (Stinking Smut of Wheat). 8 My sg « «IT (Loose Smut on Barley, Wheat and Oats). 24423. Charts, Tabulae Botanicae, Blakeslee, Guiliermond, Bauer and Jahn. These charts are of large size, i.e. 150 x 100 cm, and each chart is prepared by a specialist on the botanical order represented. The drawing and coloring is done by Ehrlich, of Berlin, under the direction and with the assist- ance of the authors mentioned above. Series Ri@hart i Myxobacteriaceae, development of Polyangium fuscum. Se ua Poe 2 kernels of Myxococcus, spores of Myxococcus. w «3. Acrasieae, development of Dictyostelium ‘mucoroides. Gs cf “ 4. Myxomy cetes: Sporangia of Dietydium umbilicatum (A, B), Trichia fallax _(C, D), Leocarpus fragilis (F), Plasmodium of Leocarpus (E). es ss 5. Splitting of Rhoeo dise olor. Series II, Chart 6. Mucorineae. Mucor. s¢ 7. Mucor. Rhizopus. uc ae ss 8. Ustilagineae I: Ustilago Tragopogonis. “ Gs & 9. Volvocaceae. Endorina elegans. << t me ag} Phaeophyceae. Ectocarpus 1b “ce “ ‘ 11 ue a “12. Rhodophyceae. Nemalion. Complete set of 12 charts, as above, unmounted. dutystrees... ne Chart 20. Hydra viridis, Hydra vulgaris var. aurantiaca, Hydra grisea. Order—Hydromedusae us Chart 18. Carmarina hastata, C. fungiformis, Hippocrene superciliaris, Bougainvillea superciliaris. Order—Siphonophora , siphonophores of the family Calycophoridae, Praya galea, Abyla pentagona, Eudoxi , Monophyes primordialis, Eudoxia eschscholtzi Halistemma pictum, Diphyes sieboldii. Order—Acalephae (Jelly-fish) cc Chart 64. Aurelia aurita,—Mastrula fixed with commencing stomodaeum, polyp with 4 tentacles, with 8 tentacles, Sey Pee with 16 tentacles, Strobila with only one Ephyrula, Secyphistoma with 6 segments; Aurelia flavidula bs Chart 96. Agalma sarsi cuboides Class—Anthozoa (Corals) Order—Octactinia (= Alcyonaria) Series I], Chart 1. Single zooid of an Octactinian; Corallium rubrum. “I: Chart 94. Pennatula phosphorea, Renilla reniformis, cross section of a polyp, cross-section of stalk of Pennatula. Class—Ctenophora xe Chart 74. Hormiphora plumosa, Bolina hydalina, Cestus veneris, Vexillum parallelum, Beroe ovata, Beroe forskalil. Il. TYPE—ECHINODERMATA : Series I, Chart 79. Development of the Larval Forms of Eclinolerms: Simplest larval form. Development of the Holothu- rian larva Auricularia, of the Asteroid larva Bipinnaria, and of the Pluteus larva. se Chart 80. Development of Holothuria tubulosa, Cucumaria doliolum, Synapta digitata, Echinus miliaris, Arbacia, Asterina gibbosa. Sub-type—Pelmatozoa Class—Crinoidea Order—Brachiata Rhizocrinus lofotensis. Small individual, crown of a full-grown specimen, calyx from above, section of crown’ section through an arm. as Chart 7. Antedon rosaceus,—Full-grown animal, calyx from dorsal side, arrangement of fibrous strings, larvae. Class—Blastoidea Order—Regulares Series! Chart 46. Ben Rortes suleatus, P. pyriformis, P. godoni, Codaster hindei, Orophocrinus stelliformis, Granatocrinus erbiensis; i) > & = o Series ‘ ty and Order—Irregulares Astrocrinus benniel. Sub-type—Asterozoa Class—Ophiuroidea Series I, Chart 59. Ophiura, Ophiocoma, Ophiomyxa, Ophiothrix, Ophioglypha, Ophiarachna. Class—Asteroidea (Starfishes) Series I, Chart 86. Asteracanthion rubens, pedicellaria, Astropecten hemprichti, Echinaster sentus. Sub-type—Echinozoa Class—Echinodea (Sea-urchins) Series I, Chart 81. Sontconn with lower floor removed, Arabie punctulata, Echinus acutus, Dorocidaris papillata, Arbacia pustulosa. Class—Holothuroidea (Sea-cucumbers) Series I, Chart 61. Anatomy of a Holothurian of the family Aspidochirotae; gullet of a dendrochirote Holothurian and of Synapta; Holothuria impatiens, Cucumaria, Chirodota. IV. TYPE—VERMES (WORMS) Class—Platodes Order—Trematoda Series I, Chart 62. Tristomum coccieum, T. papiliosum, Gyrodactylus elegans, Polystomum integerrimum, Octobothrium lanceolatum, Diplozoon paradoxum, Dipora. se Chart 33. Distomum hepaticum, Distomum lanceolatum. se Chart 73. Distomum macrostomum, D. clavigerum, Cercaria macrocerca, D. echinatum. Order—Cestoda OI Chart 15. Taenia saginata, Taenia solium. ee Chart 44. Bothriocephalus latus, Tetrarhynchidae, Caryophyllaeus mutabilis. ce Chart 99. Development of Taenia echinoscoccus, adult Taenia, genital organs of a young segment, Cysticercus condition Coenurus cerebralis; Taenia serrata; Cysticercus pisiformis, headhooks on the Cysticercus, head young Taenia serrata; development of the Cy stoid tapeworms, Taenia cucumerina, young segment of same, Cysticeroid egg of same, Cysticercus arionis, etc. 136 > R 7 3H Dy aR Fite c iio we Om MaEeACesStesce 1O) Mio iP) eAy UN < Charts, Zoology, Leuckart-Chun (continued) “ Series 1, “ “ Series I, “ “ Series I, Series I, Series I, Series I, Series I, Series I, SeriesI, “ Series 1, “ Series I, “ Order—Turbellaria Chart 28. Planaria polychroa, Dendrocoelum lacteum, Eurylepta orbicularis, Vortex viridis, Mesostomum ehrenbergi, Microstomum lineare. Order—Nemertea Chart 39. Nemertes neesii, Amphyporus lactifloreus, Tetrastemma flavidum, development of Nemertes out of the Pilidium Lineus obscurus. Class—Nemathelminthes Order—Nematoda Chart 31. Seer alone Oxyurus vermicularis, Dochmius duodenalis, D. trigonocephalus, Anguillula intes- tinalis. Chart 66. Trichocephalus dispar, T. affinis, Trichosomum crassicauda, Trichina spiralis, meat containing Trichina. Chart 49. Heterodera schachtii. Order—Acanthocephala Chart 100. Male Echinorhynchus gigas, male Echinorhynchus angustatus, female genital apparatus of E. gigas nephridea of same, oviduct of E. angustatus, and ligamentum suspensorium, section through ovary, egg of E. moniliformis, embryo of E. gigas and of E. angustatus, larvae. Vv. TYPE—ANNELIDA (ANNELIDS) Class—Chaetopoda Order—Polychaeta Chart 56. Er;antia;—Nereis (Leontis) dumerili, Heteronereis oerstedi, Nereis pulsataria, N. striolata, Alciopa can trainii, Tomopteris euchaeta. , Chart 57. Sedentaria:—Arenicola piscatorum, Phyllochaetopterus major, Spirorbis laevis, Serpula vermicularis, Sabellaria alveolata, Psygmobranchus protensus, Myxicola infundibulum. Order—Oligochaeta Chart 19. Lumbricus riparius, L. agricola, Criodrilus lacuum, Lumbricus communis, L. olidus. Lumbricus trape- zoieds, on Chart 24 following. Class—Hirudinea= Discophora Chart 24. Hirudo medicinalis, Pisciola. Class—Gephyrea 5 Orders—Sipunculoidea, Echiuroidea : : Chart 55. Sipunculus nudus, Echiurus pallasi, Bonellia viridis, Sternaspis spinosus, Actinotrocha-larva of Phoronis. Class—Rotifera, incl. Gasterotricha Chart 51. Hydatina senta, Stephanoceros eichhorni, Melicerta ringens, Rotifer vulgaris, Notommata sieboldi, Chae- tonotus maximus. VI. TYPE—MOLLUSCOIDEA Class—Bryozoa ) s Orders—Endoprocta, Ectoprocta Chart 34. Pedicellina echinata, Plumatella repens, stages of statoblasts of Alcyonella fungosa in section, Aleyonidium mytili, Bowerbankia densa, Acamarchis avicularia, Flustra membranacea. Class—Brachiopoda Order—Testicardines Chart 98. Waldheimia australis, and anatomy, Terebratula vitrea, Argiope neapolitana, larva, Terebratuls minor, Argiope kowalevskii; Lingula anatina. and Order—Ecardines Chart 101. Lingula anatina,—Anatomy in detail. VII. TYPE—MOLLUSCA (SHELL-FISHES) Class—Lamellibranchiata (Bivalves) Order—Asiphonida Chart 12. Margaritana margaritifera, development of Unio pictorum. Chart 60. Ostrea edulis—longitudinal sections, cross-section of larva ready to swarm, side view of same, heart, blood corpuscles, ball of sperma, spermatozoon, and mature eggs. Chart 77. Pecten jacobeus, Arca noae, Mytilus edulis, Spondylus gaederopus. Order—Siphonida Chart 89. Cardium tuberculatum, pericardial chamber of Venus verrucosa, Pholadidea, Teredo and larva, hinge of Trigonia, Chondrophore of Mya truncata. Class—Scaphopoda (Tooth shells) Chart 92. Anatomy and development of Dentalium entalis. Class—Gastropoda (Univalves) Order—Pulmonata , A Chart 30. Anatomy of Helix pomatia. Helix nemoralis, Limnae stagnalis, arion empiricorum. : Order—Opisthobranchiata es ; Chart 8. Pontolimax capitatus, Holis, Doris, Polycera quadrilineata, Pleurobranchus, Aplysia punctata. Orders—Pteropoda and Heteropoda , : : 5 Chart 43. Creseis acicula, Cymbulia peroni, larva, Clione borealis, Clionopsis krohni, larva of Clione and Pneumo- dermon, Firola (Pterotrachea) coronata, Firoloides lesueuri, Atlanta peroni. Class—Cephalopoda Orders—Tetrabranchiata and Dibranchiata ; n ' Chart 14. Anatomy of Octopus vulgaris, head-cartilage of Sepia officinalis, brain of Sepia, section through eye of Sepia and of Nautilus pompilius. ne i Chart 36. Nautilus pompilius, Spirula prototypus, shell of Spirula peroni, male Argonauta argo, female of same, hectocotylus of Octopus carenae, spermatophore of Sepia officinalis. VIII. TYPE—ARTHROPODA Sub-type—Branchiata Class—Crustacea Sub-class—Entomostraca Order—P hyllopoda Chart 26. Apus cancriformis, Apus prouctus, Branchipus stagnalis, Daphnia pulex, Polyphemus oculus. Order—Copepoda Chart 25. Canthocamptus minutus, Cyclops canthocarpoides, Cyclus tenuicornis, Achteres percarum, Argulus Foliace. Order—Cirripedia AS Re Tee ae Uae ay H. 1/8 EI KOM Mi CARESS, (GO NL IRS ks INL Ye Charts, Zoology, Leuckart-Chun (continued) SeriesI, Chart 87. Anatomy and development of the Lepadidae,—Lapas anatifera, entire section, embryo, Cypris stage, section of further developed Lepas, ripe young Lepas. Anatomy and development of the Balanidae,— Balanus tintinnabulum, Naplius larva of “Balanus balanoides, Cypris stage, young Balanus; [bla cumingi. sf Chart 85. Rhizocephala:—Carcinus maenas with a mature Sacculina carcini in situ; development of the Sacculina, Nauplius stage, first moult. Cypris stage, Cypris working its way into the body of the crab, young Sacculina, older Sacculina interna, cross section, longitudinal section, mature Sacculina externa. Sub-class—Malacostraca Order—Stomatopoda Series I, Chart 95. Squilla mantis,—Adult, side view, back view cut open, transverse section through abdomen, mouth parts, three stages in development, Erichthoid larva, older Squilloid larvae. F Order—Decapoda | a Chart 91. Macrura,—Larval history of Penaeus, Nauplius, youngest Zoea stage, older Zoea larva, older Panaeus larva, same more developed; Zoea forms of other Decapods, of Galathea, of Pagurus; young Homarus and larva; larva of Astacus fluviatilis. Brachyura,—Youngest Zoea of Thia, older Zoea of Maia. 5 Ww Chart 82. Astacus buviatilis,—Longitudinal section of male, section of cephalothorax, mouth parts, stomach, circu- latory system, male genital apparatus, female genital apparatus, section through eye, inner antenna. Order—Arthrostraca Sub-order—Isopoda ss Chart 3. Asellus aquaticus,—male, central nervous system, female, anatomy, embryo; Porcellio seaber,—animal groups of segments, incuhatory pouch. we Chart 88. Entoniscidiae,—Development of Cepon elegans, second larval form, male and female, ventral views; female, dorsal view; Postunion maenadis, P. kossmanni, Cancrion miser. Sub-order—Amphipoda a Chart 4. Gammarus veglectus, Pbronima sedentaria, Caprella. Class—Acerata Sub-class—Merostomata Order—Xiphosura , Series I, Chart 90. Limulus polyphemus,—Longitudinal section of body, transverse section of cephalothorax, of female Limulus, circulatory and nervous systems, genital organs, young Limulus. Sub-class—Arachnida Orders—Scorpionida, Pseudoscorpionida, Cyphophthalmida Series I, Chart 45. Inner structure of Buthus; Buthus afer, B. occitanus, Scorpio italicus, Chelifer cancroides, Gibocellum sudeticum. Order—Araneida “ Chart 42. Inner structure of a female dipneumonic Araneid; Epeira diadema, Segestria senoculata, Tegeneria, Zilla calophylla, Anyphaena accentuata, Philocea domesti ico, Agalena labyrinthica. Order—Acarina s Chart 48. Metamorphosis of Trombidium fuliginssum; Tyroglyphus siro, Trichodactylus anonymus. “ Chart 58. Sarcoptes scabei var. hominis, 8. mutans, Chorioptes spathiferus, Psoreptes longirostris, Analges pas- serinus; Desmodex folliculorum. Order—Linguatulida CG Chart 63. Linguatula (Pentastomum) taeniodes, Pentastomum denticulatum, P. torquatum, P. multicinctum, P constrictum. Sub-type—Tracheata Class—Prostracheata Class—Mpyriopoda Orders—Chilopoda, Symphyla, Pauropoda E . Series I, Chart 32. Lithobius forficatus, Scolopendra borrida, S. complanata, Geophilus, Scolopendrella, Pauropus. Orders—Diplopoda, Onychophora « Chart 38. Polodesmus complanatus, Lysiopetalum insculptum, Iulus londinensis, Glomeris marginata, Strongylo- soma guerinii (also Peripatus capensis). Class—Insecta Order—Orthoptera Series I, Chart 11. Migratory locust, Edipoda stridula, body of Acridium tartaricum, mole-cricket, grass-hopper- xe Chart 22. Pelarius, Ephemeridae, Libellulidae, Agrion puella. “ Chart 83. Termes lucifugus, Eutermes from Borneo, Termes from Java. Order—Rhynchota CG Chart 17. Phylloxera vastatrix,—Vine leaf covered with galls of Phylloxera, development, apterous sexual genera- tion, male and female generation, root-attacking generation and egg, winged generation, subterranean pupa. Map of France showing distribution of Phylloxera. Order—Neuroptera 4 Chart 9. Megaloptera, Chrysopa flavifrons, Trichoptera, Strepsiptera. Order—Coleoptera a Chart 6. Potato beetle (Doryphora decemlineata). bad Chart 78. Hylesinus piniperda, Bostrichus typographus, galleries in trunk of a fir tree, Bostrichus laricis, Eccopto- gaster scolytus, Clerus formicarius. os Chart 84. Organs and metamorphoses of European May-beetles (Melolontha vulgaris and M. hippocastani). _ Order—Diptera 3 : “ Chart 70. Musca (Calliphora) vomitoria. Sarcophaga carnaria, Musca domestica. Order—Lepidoptera CG Chart 21. Cabbage Butterfly (Pieris brassicae), Goat Moth (Cassus liguiperda), caterpillar of Bombyx pini, silk glands, etc., head of larva of Aporia crataegi, head of imago of Sphinx pinastri, seales from butterflies’ wings, alimentary canal of imago of Sphinx atrovos, egg of Smerinthus populi showing micropyle. Order—Hymenoptera sf Chart 41. Galls, adult insects etc., of certain Gall-Wasps of the oak. s Chart 27. Honey bee (Apis mellifica). < Chart 97. Anomolon cireumflexum, Gastropacha pini, Microgaster nemorum, Teleas phalae narum, larva of Platygaster. IX. TYPE—CHORDATA (VERTEBRATES) Sub-type—Acrania Class—Hemichordata Series I, Chart 93. Balanoglossus kowalewskii,—Development. organization of larva. Class—Tunicata (Urochordata) Sub-class—Copelata (Larvacea) Series I, Chart 71. Appendicularia and tadpoles of Ascidiae, Oikopleura cophocerca, Stegosoma pellucidum, Clavellina lepadi-formis. 138 A Rie de He Ur OR H. ei Oe Me SAS Es CeO UM Rae AS aN < Charts, Zoology, Leuckart-Chun (continued ) Sub-class—Ascidiacea Series I, Chart 53. Anatomy of Ciona intestinalis, Corella parallelogramma, Clavellinale padiformis, development stages of the simple Ascidians. Sub-class—Thaliacea Series I, Chart 40. Doliolum miilleri, D. ehrenbergi, Salpa pinnata, Salpa democratica-mucronata. Class—Cephalochordata Series I, Chart 72. Development of Amphioxus lanceolatus. Sub-type—Craniata Class—Pisces Series II, Chart 1. Electric organs of Torpedo marmorata, Gymnotus electricus and Malapterurus electricus, pseudoelectric organs of Mormyrus and Raja clavata. Order—Elasmobranchii Series II, Chart 2. Embryonic development of Plagiostomata: Belfour’s stages B to K. G Chart 3. Sections of early stages (to stage C.) ~ Chart 4. Sections of later stages (from stage D.) be Chart 12. Skeletons of Acanthias, dorsal and side view of skull of Notidanus cinereus, tooth of Acanthias and of Notidanus. (Double chart). , Order—Dipnoi Series IJ, Chart 10. Various specimens of Ceratodus, Protopterus annectens. Class—Amphibia Orders—Anura, Urodela Series II, Chart 5. Embryonic development of Rana temporaria and Triton, in detail, earlier stages. ie Chart 9. Embryonic development of Rana temporaria, R. esculenta, Bombinator, and Triton, later stages (in con- tinuation of preceding chart). ey Chart 69. Metamorphosis of the Common Frog (Rana temporaria). sé Chart 6. Skeletons of batrachia, Rana temporaria, esculenta and tigrina, details. re Chart 11. Intestinal tract of larval Pelobates fuscus, and Rana esculenta, jaw of last, dissection of pyloric tract, pharynx of newly hatched Bufo vulgaris, etc. _ C Chart 10. Vascular system of amphibia,—aorta with branchiae, heart and arteries, venous system, section of heart of frog. LS Chart 8. Nerve system,—brain and spinal cord of Rana temporaria, sections of brain, sympathetic system, brain of larva of Bombinator igeneus, spinal cord of Rana esculenta, sense organs of lateral line of head of larval Triton taeniatus. x . Chart 7. Urogenital system of Amphibia,—segment-canal from kidney of larval Siphonops, urogenitalia of male Rana temporaria and R. esculenta, and of female of either species, diagrams of male and female urogeni- tal systems of Triton taeniatus. Class—Mammalia Order—Primates Series IJ, Chart 37. Gorilla eugena, skull of adult male Gorilla, head of adult male Chimpanzee, skull of an adult male Orang- outang, head of Semnopithecus nasicus. > No. 24484 No. 24490 No. 24496 24484. Chronograph, registering, with electric motor and regulator after Thury, with three speeds, i.e., one rotation every minute, one every ten seconds, or one every second; electro marking magnets with two writing pens, all mounted on carriage with variable speed. A precision instrument for the graphic recording of any laboratory experiments requiring the measurement of small time. IDUIAZ en 5 osocsuesounguaooodnn 300.00 Duty Paid sccectapesrasccterens« .. 375.00 24486. Chronoscope, Hipp, with two dials, reading to ;\;5th of a second; clock-work operates for one minute. Duty Wreet se here dessacec estes 96.00 Duty:Paidi7. 2434 eee 120.00 24488. Chronoscope, Hipp, as above, but on wooden base with levelling screws. Miutyghree yaks ei aslelceieisa eee 90.00 DutysPaidee sear eck ae 112.50 24490. | Chronoscope, Hipp, large model, operating 6 minutes from one winding; on column support. Duty Mreeeat eset eases eee 156.00 Duty Raider eee eee 195.00 24492. Chronoscope, Hipp, as above, but on wall bracket. DU ty ReGen = cirocee eiersvelsinieies-- 144.00 Duty/(Paid: ecccseiikee cts sosascs 180.00 24496. | Chronoscope, Ewald, for counting rapid interruptions in electric current, such as from an electrically driven tuning fork, ete.; dial divided from 1 to 100; pointer may be set instantly to zero after each reading. IDEA ORC Bp sgennopccds eye ideforea 50.40 Duty Paid %4...5 5 eee Ome oe 63.00 139 No. 24508—Small 24500. 24504. 24508. 24510. 24514. 24518. 24522. 24526. No. 24508 —Large No. 24510 No. 24526 No. 24518 Clamps, Bunsen, extension, of japanned iron, with cylindrical rubber covered jaws. For use with clamp holders No. 24518 and No. 24526. Motali lengthy an chess «acces. eis crs ase sintere oe EC ee Sn ehavalia Sr, ute 8 9 Will take tube, inches in diameter.................... Ree A Sco 1t 2 LOE | Rei een aeAaAMMemMnS on con Goconrormoocscd uo oo oe cong enlel ose: 40 .60 Clamps, Bunsen, extension, of japanned iron, with one flat and one V shaped rubber covered jaw in the small and medium sizes and two in the large size. For use with clamp holders No. 24518 and No. 24526. Motalslen eth, Wn CHES! oye. ce wise eyarese arsiateve le yaoteV A Yara eieie eels afore eter yoe Std ie 9 10 Willitsikettuberanchessinudiameters\).).-)-mietaeyeeeel eae cian ete reer eal 20 2 CHa as erste crrcyatee ciesole ea a eyeye arenes 510) oh a ove (018 2 fu yeiorsheie us lores eke icereOysioete rere 40 -60 -75 Clamps, Universal, extension, of japanned iron, with universal motion permitting its use for articles of irregular shape. Especially recommended for use with condensers and retorts. For use with clamp holder No. 24518. Totalbleneth vinches#sace. ee ors ee are nek en eee 8 11 Will takertubesinchesuni diameters. .c2 sistas ons) eiinsie ici eines eee eee 13 3 DE) Dire nee eho seas ae Soro MCU nooo mat rcaou cen oda aamoo COCO hoon. -75 1.25 Clamps, Hoffmann, extension, with one flat and one V shaped jaw, covered with rubber, the flat jaw with parallel motion. Total length 94 inches. Will take tubes up to 1} inches in diameter........ -40 Clamps, Ostwald, extension, of polished brass. Jaws will take tubes from 1 to 50 mm in diameter. 2.00 Clamp Holder, of japanned iron, with brass screws for attaching extension clamps, extension rings, etc., to apparatus supports. Borsupports. upto; unchessin diameters-cetere «ices == <<) 5-212 1a ee eee 3 3 Bach. 6)! 20s hs See eee De BR ROH AE ARERBe AA aRO CEERI TELSCOnG ao so0C: -20 25 Clamp Holder, of polished brass throughout, for supports up to 16 mm in diameter.............. 1.10 Clamp Holder, same as No. 24518 but adjustable, for rods up to 3 inch in diameter............... -50 140 NU ill No. 24586 No. 24594 Clamp, of nickel plated brass, with rubber covered jaws.................----seee2eeeeeeee -50 Clamp, of stamped steel, with rubber covered jaws; adjustable by check nut to any angle. Aw ide ly used ain CUSAUISTACEOLYE Cl AM Dr ocen is crarctesiseile ce ache eee Pelee eT eee NOE EES nee rien eionaeey: .. 40 Clamp, of japanned iron. With rubber covered jaws held together by spring...................... 55 ClampYsametassNon 245359) bub, fortwo burebbesaes occ Pee cad Small Medium Large he oe inchesiin diameters... cc nc. cc toreee eee ote eee tees sto4 4to6 6 to7 eS os ate OE a RO es ees eee 25 25 25 24614. Clamp, Chaddocks for holding test tubes and’ necks of flasks: ..........5-022....+.--2 ee -5e eee eee 25 24618. of wood, with rubber : spring, for test PtUbES..55. einen. sass. eke. ee 10 24622. “same as No. 24618 but with wire spring. 2... --.-.. 0.2... - 0: ese eee ee 10 24626. “Stoddart, of spring brass wire, 43 inches long, for test tubes. . RRR EPS a oc ac 15 24630. “same as No. 24626 but of nickel plated steel WITe..2. oes oes tne se sen ee 10 24634. “of nickel plated steel wire, for test tubes, improved form, 6 inches long................... 15 24638. cf nickel plated, for holding crucibles and small dishes. ...........:......2 +. case == seen 40 24642. G ce German form, for test; SubeS:« 2c /6.cce.chic once nce cos cuore 40 24646. Clamp, Hoffman, nickel plated, for rubber tubing, so-called ‘“‘screw compressor.’’ Dimensions given are for maximum diameter of tubing for which clamp is available. Size Winches sac soe ecieoetieo.s acc eseisltls cesses ees tte entae ae cie eeer aa eeIae ae eee 3 os Bach:: poe niece sms: eee es Hole tsa nase ine soeehis sig ties aires} ose eee 20 25 24650. Clamp, Hoffman, for rubber tubing, nickel plated, with one swinging jaw. Maximumudiameter) of tubing, "inches! s-...-5,..)-1-eiel see elas See ee eee ae 2 Bacher eee ere oie once cltzeane diofhiduate)t)s these a Siate Sie poe eee oe GDB 30 24654. Clamp, Hoffman, for rubber tubing, nickel plated with open jaw. Maximum diameter of tubing, INChES> s/s a.) eisstasels PO eee Ee ey eee 3. EC) | Bap ene oO GAC epee Reno re ial tint Rte erdnie doin marciGmccict cc 25 -30 24658. Clamp, of brass, nickel plated, for rubber tubing, extra heavy, } x 1} inches...................... -50 24652. “ Mohr’s Pinchcock, of nickel plated spring wire (rectangular cross section) for =n tubing. Motal lengthrofsclamp pinches ereee er aie. ene ee eee eee ib Psi? 24 3 DE” BA SAP Bae os GaBiGas yoocnnn GaeeedoeDonaamL Se sean oassS 10° ETS -20 25 24666. Clamp, Mohr’s Pinchcock, for rubber tubing, same as No. 24662, but with automatic catch to hold clamp open. Total lengthvoficlamp;tinches*saccs oe eet Gynec sini. = tel evnione ore eerie 2 23 3 Bach gs: cre dciaiss ate isis jose Uren So oc as Saoas ho aoe Dee oe eo taoe 25 -30 35 24670. Clamp, of brass, nickel plated, for watch glasses. Foriwatch glasses) mm yin! diametense.a-tsjeisiais fe = ial -s-1-)21-1=5- cle cise ea eee eee 50 65 Bach’... osiceesissisicis bps snoeccanesossanencdac BRESC COU NaadAI4 > noGagmsoooSaSasase 15 -20 24674. Clamp, of malleable iron with steel screw for fastening apparatus to table. eneth; inchesssccerc ccs sos cc eae ae eee aioe Gee oieiete tate 3 4 5 6 Bach sr: (ici2 esac ck hrs se mae ee eee oat torcto stole aici -30 -40 -50 -60 142 Aenea” UE Ur aR alg ie his (On Mie Aw iS Ce Oe Ma aPreeAy Nis =; ORGM DRGM. A — | Bsa) { | [ ; [ eae rita mle UpL=Ssa) I) =e as] DRG No. 24678 No. 24682 No. 24686 w, DRGM 2 K wee = Sa \EA . | . ‘\ = \ yy ¥ = e lect ect Ss =| |2 = od =— = ce ] eles i >’ 1 { 4 \ ay ‘ 8 tesla y ; Uw i —— No. 24702 No. 24706 No. 24710 No. 24718 No. 24714 No. 24690 24678. Clamp, for thermometers, burettes, conductivity vessels, etc. The advantage of this clamp is that the same spring which clamps the article to be held in a vertical position, i. e., thermometers, ete., serves also to clamp the support on which the clamp is used, thus obviating the use of any screws. The clamps are of spriu.g brass, heavily nickel plated and are kept in stock to fit verti- cal supports of 6 mm, 8 mm and 10 mm. PROMO NB Upp OLbs MIT ee a csi soe terereuel-ves ett oie a0 & n eiieyaae Cie ncromve eee =i 6 8 10 BACH epee =. c sacte = wisss avcieicie anaes EEC RRIoe 63-24%: s slogrsd ats ete 90 90 90 24682. Clamp, as above, with handle, for holding test tubes, small flasks, ete...... 1 Crete Oh cata apres 1.15 24686. Extension Holder with clamps as above to fit 6 mm support. INR See Gi GEE Grane powacs GoaoRo co none ane ETS ost oo th 1 2 DEG... db<. See eR oem ee PPP Pian Sos sc cep. 1.10 2.00 24690. Clock (Thayer Interval Timer), new model with bell entirely enclosed in brass case. Very convenient IDMn ON PACONtINN OWS) AbONALOGYAOPCLAblONS.\- 1-1). o2aetee eet eee eee ee 4.75 COLOR TESTING APPARATUS. 24702. Color Comparison Tubes, Eggertz, for the estimation of carbon and manganese in steel by the colorimetric method. (CVS ENGIN,” CLO REET IR IRIETERS oes co sbeacta Sete oo CORREA ine =o He sit.co Heks Am Somee MAIS 30 50 (Grad iateGhrney Ce: ss ecs.ci. Pe eteS eee ates se cuachenais ee «2% Stee ee ee eae ean deme: Ys to = Bergcetqo lator ones asco ok oe ae eee tis se Eee 2.50 2.75 MMA OD ULES TNT vey= fore paicchchsianctenckciarr PERT Seete- a ol aus arate feirieret aletare BYR ey AN ene Coa 5.00 5.50 24706. | Color Comparison Tubes, Julian, same as No. 24702 but with bent ends. The bent end permits the mixing of the contents without the use of a stopper in the tube. The lower portion of the tube is ungraduated. Graduatednomeicehyaeerci nee cides lb. 1 lb. 2 lbs. Each 40 75 1.50 Combustion Capsules, Royal Meissen Porcelain, without lip, as used in coal analysis. ID Maker (eee pect Renee nro oioe oe Goo eH oie to an oo nacre ooo omoOere cu mancoconoonoonGnaT 40 50 IDYeyotua Maint Ga besb 00.00 pouia acer on aoe AP ORMOSEN Aare MeOH oSbd ad ToC ee GOU Nem T 22 30 DENG i thao a8 COG RGOSE SODAS OOo Mts cE Con OR o EO Oe ne DOR Cum ODOR arcing anc. -20 .20 Combustion Tubes, Alundum, to withstand temperatures of approximately 2000° C. These tubes are made gas-tight by glazing without sacrificing their refractive quality; in 24 inch lengths. Inside diameter, inches. SRC en eae RE ant o eect oombci re G 3 1 [DIN Nn OE ce 0 0 a en lee eee 4. 95 4.95 4.95 Combustion Tubes, Sanitats Porcelain. Glazed inside and outside. In 60 cm lengths. lick Chinn tae la a aeeronemeueted pode ome cemcoS ee ad ce 15 18 22 25 DEVS Net ovio Aci GbE 6 DtrE Rec CID Aaa eG ERE AAD 1.60 2.00 2.29 2.75 Combustion Tubes, Royal Berlin Porcelain, glazed inside and outside. Will stand a temperature of 1100° C. and are paractically gas tight. In 60 cm lengths. lhasiiokes Ghiaiaiciny ie. Sep acdeiene nanan poeeenEaoroubporindauponedeadtoss 15 20 28 LD Who pcootiOne eas Jc HOOGR are SOOCUC Lee pot ao Otdn ane donnron come neene 4.50 5.40 7.20 Combustion Tubes, Marquardt Mass, for temperatures up to 1650° C. These are furnished either glazed or unglazed. In 60 cm lengths. Jmsid exdiame tere mn eeeetrles eisai ier olatcter~ SPR erste) sare jevetetrereLs 15 20 LOEWE tol So Hep ae ade doops cabaeeuon coasEeDbe cob comonnb oe cans DonodseEAAconer jac: 4.00 4.75 Combustion Tubes Opaque Silica, for temperatures up to 1500° C C. Tubes of the following diameters are carried in stock in 2 ft. lengths but tubing from 35 in. to 2 in. inside diameter can be fur- nished in lengths up to ‘8 ft.; 24 in. long x Z in. inside diameter is the standard tube for Hoskins Combustion Furnace No. 28988 Inside diameter, Inches.........-:..------ 4 s 1 Pach unplazed es... octane aa es oes . a: 4.20 4.60 5.00 Each, glazed on outside and atone end.) . 4 Bede aac 5.20 5.60 6.00 Combustion Tube, Vitrified Clay, Johnson. W hen used with tapered ‘clay Eonreutor below rubber stoppers are unnecessary in carbon combustion work, etc. See Journal of Industrial & Engi- aang (CHAPS ped Us J EN Sina cc ree tance Dep OOUbIb O DE nodcr A Compe OcUbUOUnbEGO REC aCe obe bor 3.00 Tapered Connector, Vitrified Clay, for use with above...................-. AGA Be eine 149 AUR, Te Hauer H.. TS AY OF Me JAS CO MINIaiP Gee Ney, a a VANIER COMBUSTION TRAIN No. 24958 COMBUSTION TRAIN, VANIER, for the Determination of Carbon in Steel by the Direct Combustion Method with Electric Furnace, consisting of the following: H and Hi’, 4 liter Aspirator Bottles for maintaining a constant pressure, H being filled with water. A, Potash Bulb with caustic potash for purifying oxygen before entering tube. B, Calcium Chloride Tube, for removing moisture from oxygen before entering tube. C, Hoskin Electric Combustion Tube Furnace. D, Glazed Quartz Combustion Tube, ? t inch bore and 2 feet long. E, Vanier Zinc Tube for granulated zinc, to remove any trace of sulphur. F, Vanier Sulphuric Acid Bulb, for absorbing moisture. G, Vanier Combined Potash Bulb and Drying Tube. The determination of carbon in steel is one of the principal duties of the Steel Chemist and when this analysis is made by the direct combustion method with the proper furnace and absorption train, it becomes one of the most satisfactory analyses, both in point of time and in accuracy to be made in a steel laboratory. This com- bustion outfit is the design of Mr. Geo. P. Vanier, Chief Chemist of the Pennsylvania Steel Company, several of the important components of the brain being specially designed by Mr. Vanier for this apparatus. With this outfit one man can, with five outfits, maintain a rate of ten combustions per hour. An important feature of the outfit is the Vanier Combined Potash Bulb and Drying Tube (Patented) Fig. G of the illustration. It offers many advantages over the bulbs formerly used, i.e.— Large capacity. Six grams, or more, of carbonic acid can be absorbed, thus enabling the chemist to make over 100 combustions with- out refilling. No rubber caps are necessary when weighing with the bulb filled with oxygen as the glass stopcock closes the inlet and outlet. Having a drying tube attached they are compact and more easily handled than the ordinary bulbs. They have a smooth outer surface which is easily cleaned. They are self-supporting and, having a firm base, can be conveniently placed on the balance pan when weighing. The drying tube being vertical, the moist gases pass in at the bottom and the drying tube never stops up. As the solid caustic potash deliquesces it forms a pool in the bottom of the drying tube thus making an extra seal. The gasses can be passed at a high rate without loss of CO: or moisture. When gases are passed through rapidly the action is perfectly quiet without any spraying or jumping of the solution. 24958. Vanier Combustion Train, complete outfit as illustrated, consisting of aspirator bottles H and H’; bulbs A. B. E. F and G, Hoskin’s Electric Combustion Furnace C, glazed quartz combustion tube D rubber tubing, supports. clamps, glass rods, two Alundum combustion boats, 3{ x 3 inches, and + Ib. of RR, Alundum'but without oxygen tanks... 22.5.2 .0cec: ae oes eee oe 42.00 24962. Vanier Combustion Train, complete as above, but with the addition of Hoskins Rheostat for regulating temperature Of furnace: ccc. ae ws ciw Seid ce ele Slareie sreeheys cle elehe die eres ele ee ahs ee 50.00 Single Parts. 44732 Potash Bulb. -A-of illustration occ cys 0s cece wc vieisccte ms nieue oie eievereternaloleiotorseyele tetova oe 50 23252. Calcium Chloride Tube. B of TMs bration... -akeceee Meggan ete Mh sot costs; -90 28988. Hoskin Electric Combustion Tube Furnace. C of illustration. ............... 00 cee eee eee eee 25.00 24954. Glazed Quartz Combustion Tube, } in. bore x2 ft. long. D of illustration.................... 5.20 26656; Vanier:Zinc'Tube:, HWofillustration. 29... <..<. +5 o< cies eee ces tne ee eee eee 75 26660: Vanier'Sulphuric Acid Bulb: Hofi illustrations. 2. 0... sco an cieseiiee cle ieee ee ieee ree Hepa 26664. Vanier Combined Potash Bulb and Drying Tube. G of illustration............................ 3.25 24918: Alundum'Combustion Boats. 32 in. x} ins) each... ..02..00.-0s see. of oe dees 35 24930; RR Alundum; In 1 lb: glass'stoppered!bottles so. 0 ..05-..<.c52. saan nae sales eee eee -75 24964. Factor Weight, 2.7273 grams, of lacquered brass. For weighing charge of boat................. -75 24970. | Compression Pump, hand, for laboratory use in the compres- sion of either liquids or gases. For pressures up to, atmospheres... 300 —_—1000 Duty, Bree: ecvnsoc a. sac oe ae eee 136.40 156.20 Duty Paidis.s Geansnccsseceeswcecee 173.60 200.00 24974. Reservoir for the above, on stand for the Cailletet experiment in the liquefaction of gases. For pressures up to, atmospheres..... _ 300 __ 1000 Duty Kree:so.55 eee eee ee . 39.60 50.60 Duty Paides cock te es eee ce eee 50.40 64.40 Note :—Compressors for liquefying Air and Hydrogen of large Capacity are listed under Liquid Air Apparatus, page 285. Compression Pump for the Determination of Critical Pressure, with high pressure manometer mounted on board, with six extra capillaries. See Phys.-chem. Mess. Seite 228. VON T aA LO get ete ee a a eae 43.60 Duty baid ssa ee re ee 59.40 Compression Pump, Ramsay-Young, for gases, consisting of an iron compression cylinder with screw for pressure up to 200 atmospheres, with three tubulations for manometers, three calibrated and sraduated manometer tubes of English lead glass, two cooling jackets with thermometers, etc. See Travers. experimentelle Untersuchung von Gasen pag. 251 Braunschwerg 1905. Dutyabreesen o.l sect yetoenes 90.75 Teity Paid. oo ec ese5 AYE a AS | (| Ve ta i a \— jl | Zs Mie | 2) i WAKE AK WA ASO GUNA \ '\ AN ayy S i No. 25000 No. 25004 No. 25008 No. 25012 No. 25016 No. 25020 No. 25024 No. 25028 No. 25032 25000. Condenser, of brass, with condensing tube of glass. With rubber stoppers. eng thymnm’ jayejo. asics ier o's 300° 375 500 «600 675 780 — 1000 LOG (se Ga apeeno dane porn cend 3.00 3.50 3.80 4.20 4.50 5.00 6.50 25004. Condenser, Liebig, of glass, with condensing tube in form of coil sealed in water jacket. rem th spmmi neh ae cfr sistecisiociei adele 150 200 250 300 400 _ 600 LOE Waocubadbapebtodn code onaco0docuGS 1.25 1.60 1.80 2.25 3.00 5.00 25008. Condenser, Liebig, with rubber connections. Rengthveminien nana ee 250 300 400 500 600 800 1000 LEY (hee sun ceeinaounemuasohe 85 1.00 1.10 1.25 1.60 2.00 3.00 25012. | Condenser Tubes for above condensers, of glass. Tengthy mmo). 04... ach apes 250 300 400 500600 800 1000 Bia cha sepersate ie siedsno:< cferes wistnstornts 18 20 22 25 35 45 -65 25016. Condenser, Liebig, of glass, with inner tube sealed to body. ILGRY Ady oil RongbeaopacoobdueNs oppebonsoocduooOS : 250 300 400 —_—-500 600 LEG Rous popes Seneeeppitogacood ccous roc mobugodacs -90 1.10 1.25 1.65 2.00 25020. Condenser, Allihn, of glass, with bulb condensing tube. Weng thins. sent cc neoce eee eee _ 200 250 800400 600 JOG ba GonetorooouAsBaocerune oddaaracondDOb bodes 1.10 1.25 1.40 1.60 2.40 25024. Condenser, Hopkins, outside jacket 35 cm long. As widely used in Extraction Apparatus. See Journal of the American Chemical Society, December, 1908....... 2.2.20 -.++seee sees erste cess 1.75 25032. Condenser, Géckel, may be connected air-tight with receiver and used either as a reflux condenser or inside. Wengthv of jacketuimehessjrtere cis cre niereaicicrio sy ofeselolsto oyster teelotelskete:eteteleysttel- 11a) eek rere mes 24 LEY) ieeaamoannns0b,0bs coconbe OSE eb ao asnDU DC ONSHOOL0O CODdeseonURoOuOU OOS GHG 3.00 3.60 25036. Condenser, Sulphurous Acid, Liebig, of glass, with two stopcocks on horizontal tubes........... 2.25 25040. Condenser, of glass, with spiral. (OE Liny COsccanon 6 shdaccosoacesoounEdTeaos boideT 500 _—:1000 2000 LOY) (Sa. denSouon Soonucnad adusoeCooboducdud comoemome 3.00 3.50 4.25 25044. Tripod, of metal, for use with condenser No.25040. HOT CONG ENSELIRGC eee ieieraiatstersieroteieteie teeters 500 1000 2000 JOVI a Bbodansducso oo sdobde sonooseedbere amon audi. 1.00 1.50 2.00 No. 25040 Avene a he Ul °R H. Th Fie Oe Mis ALy CS CoO} 0 Mt URS A N Y \ ee || <= HU A Rie af | Be 11S § --SI
: alc 18 32 DECILES cnn sooo En OSbGR Oe 6 cos OR aU Sma Re Coosa abnDSEpnErpoconte waits 50 75 25154. Cork Screw, quick acting, in heavy wooden handle...............---. 2 30 aaa a Be Stns A 25158 s “self pulling, with wire cutter. The most simple and practical cork screw made..... .50 Do OD COKE LON ES Ol COMPLessin ey COLIN Dye AIG sever ste (elevey sess elel eters ele telodetere leet eer ele tet elmo tade tensa leetetetehaleietetee1- 15 25166. Counting Apparatus, Stewart, for colonies of bacteria, consisting of a hard wood box 12x6 x 8 inches, which contains a 16 candle-power incandescent lamp and adjustable platform carrying a Petri dish which is illuminated by oblique rays from the lamp which do not enter directly into the eye of the operator. A ruled glass plate is provided on the top of the box and the counting accomplished by viewing the colonies in the Petri dish through the glass plate. See Journal of lilen heal asec. daar, UOT. sonssodocaau sco neo soSau COSC SSH gto une OoRODDeSoEnaEoS 12.00 25170. Readingeliens=sonusenwibhnusdme seers eiecleiicis teh ee Ae eerie eieiecaeiext tetera 1.50: 25174. RulediCountingablatetomlyaeepmcers setae rie ele el eberar aie eyecare egee eer eee aerate rate 6.00 25178. Counting Apparatus, Wolffhuegel, for colonies of bacteria. Complete on wooden base with ruled glass platerandiblackrand white yo ac k-PNOUNGS eyes aieie los teletstele oatel ete telete letersi eletee etore ete ketetaleiet leletel alerts 5.00 25180. Ruledk Glassublate nom liy.s ste vshe.5s0.5 5 dl eiecaretovetanel caters cece ouseece stays oie to cherats soem (nucyapeseasrenee\ eereve sees 1.50 25182. Counting Plate, Jeffer, for colonies of bacteria. See Journal of Applied Microscopy and Laboratory Methods, Vol. 1, No. 3. Can be used interchangeably with the Wolffhuegel’s plate on the same base ; BC AR AAC OCLC : ; .. 2.00 No. 25186 25186. Counting Apparatus, Boéttcher, with moist chamber, consisting of an ordinary micro slide with glass ring 20 mm in diameter and 8 mm high cemented thereon. Cover glass for same ruled into 100 squares of 2 mm each, 19 of which squares are numbered. 1.50 No. 25202 25202. Crucibles, Denver Fire Clay made in both hard and soft burn, without covers. Capacity, @LAMS! <<< ct celcne ele Ror micrepite re 5 10 15 20 30 Approx. number in original barrel : 900 550 400 350 300 PersGOZen er. xcaccrvocees- 40 50 55 -60 1.00 Per 100 in original barrel 3.00 3.90 4.00 4.50 7.00 25206. Covers, per dozen 40 40 -40 -40 40 No. 25210 25210. Crucibles, Denver Fire Clay without covers. INIMDeR Sacks oon os eee eeeiee D E F G J K L Eereht-sinchessren cease + 15 5) 53 63 7i 8 Diameter, INCHESE Mace cen 23 3 3t 33 43 42 5} Approx. number in original barrel 500 350 300 200 150 75 50 Ber dozens ssacoseseiied ¢ aie oe aesie -50 15 1.00 1.10 1.80 2.20 3.60 Per 100 in original barrel......... 3.50 5.50 7.00 8.00 12.00 15.50 27.00 25214. Covers, peridozens-c.. sc oaa eee Boo) 50 5D 60 -80 1.20 1.40 ih PLUMBAGo TRADE MARK TRADE MARK. No. 25218 No. 25222 No. 25230 io. No. 25242 No. 25246 25218. Crucibles, Hessian Sand, triangular form. Threes Small 5s Centimeters Large 5s Eights Sixes Number in nest....... 3 3 3 5 5 6 Height of largest, inches 3 4 y 4h 73 5} Width at top, inches. 25 3 i 3: 53 4} [Pe HS hascosaeoocnac -10 -10 -10 -10 30 20 25222. Crucibles, Battersea, round form. Dimensions given are outside dimensions. Without covers. NUM D OES: oie osteineece cee cis sieiecie’e os 03 A B D E F G H J ETN RIC cons oednn nose seBAenueOoS 23 3 33 4 43 5 53 53 z Diameter: iNGhess..a.2 aes see ieee ssc : 1% 24 23 23 3 32 3? - Number in original barrel.............. 1000 1000 750 500 500 500 400 300 250 PET OZ CMe area osre aio ctare ns eres ons orsseaiel 30 235 40 45 -70 80 “1.10 1.20 1.65 Per 100 in original barrel............ . 185 2.25 3.25 3.60 5.75 6.25 8.60 9.00 13.00 25226. Coverss;per dozent =: <2. re) 4 Ge (S ee) ee a ae fo) ES > Ww (@) ° x PB? ASS ONT ty No. 25490 No. 25494 25490. Ball Mill, consisting of a porcelain jar with pebbles. Will handle specimens from } oz. to 1} lbs. at one time. Pulley is 9 inches in diameter x 1 inch wide and requires 80 to 100 r. p. m. for fine grinding. Outside dimensions of jar 5.2 x 5.7 inches. Price complete with pebbles...... 15.00 25494. Ball Mill, consisting of a porcelain jar and pebbles. Jar is 8.7 x 9.6 inches. Will handle quantities from a few ounces up to 5 lbs. Wheel pulley 9 inches in diameter, with handle. Requires 60 Taipaims Complete with pebbles. f-,../.5- 1. sraye1oie syemereins ciel ieeiont alee eel heise eee ee eee 30.00 25498. Extra\Jars, ‘for No. 25494, each. 5). oc00< sesame ese gos cee sleet silane etal eee eee eee 12.00 25502 Porcelain'P ebbles, per Wb. 256.05 cece sce nse cuitae aoe. cae cere ee eee eee eee ete 30 On No. 25506 No. 25518 25506. Grinding Apparatus for Bacteria, etc., White, and as used in the laboratories of the Pennsylvania State Live Stock Sanitary Board. Glass globes may be sterilized with the agate marbles inside. Complete with two glass globes and set of agate marbles.................seeceeeceeeeeeee 35.00 25510. Extra: GlassGlobes; each) ...:s.:. <. 006 ccwslecocetee ewe see oe seeis te phe oe es Seen 5.00 25514. Sa Marblespemboxiot 25.655. seen ences Hee oat fet aap ote OE 5.00 25518. Ball Mill, Porcelain, small model on baseboard, with water turbine and including 2 kilos of hard porcelain balls. Duty Free. 26.40 Duty Paid....... Sc editn deo eee 32.00 .No.25522 (See descriptien on following page.) wee ie tl] al om A se oO MPA NY OR MaAge S28 CO MSP eAIINm Ly. ee YS YOM PP ANN 25522. Grinding Machine for Bacteria etc., consisting of from three to five horizontally operated porcelain mills. As furnished by us to the laboratories of Henry Phipps Institute, Philadelphia, Pennsylvania State Live Stock Board, ete. Complete with motor for 110 or 220 volts direct current. NumpberroryMillse, conan sate met tech ccccc eu oeea ne na20 3 Sid 5 LUI? LOG o8 dis daotca dan aS Se ane aan ee ti tony ne 136.15 163.35 199.65 252.30 LIS] LPT ise o de ene b© Geli ts ah aera alate Da TE a 165.00 198.00 242.00 305.80 25526. Extra Porcelain Mills for above, capacity 1200 cc. Can be sterilized. Duty Frees each neces oe ee 8.75 Dutyabaidseachseayn eee eee 11.50 j No. 25534 j No. 25530 No. 25538 25530. Grinding Apparatus, Macfaedyen, for Bacteria and Frozen Organisms. The construction of this apparatus is based upon the fact that the organisms pulverize better when frozen by liquid air to the hardness of glass. The mortar is operated in a liquid air vessel. Complete with motor. Current and voltage must be specified in ordering. ; Duty Free........ : at RE ee 591.70 Duty; Paid: 5 see eee 717.20 25534. Grinding Apparatus for Organs, Tumors, etc., by means of pressure applied during the cutting. Model of the Hygienic Institute, Berlin. The substances can be finely enough ground as to be injected directly. Capacity meramsssc.msnenceemen ee 13/5: Oust cect ta lecer RT ERIe AE eR ER 3 a Duty AE ene raere etter ae ATS ides eins See Ee ROE eee eee 24.75 49. Duty Paid Shao fat RPE CHC LnfL CYSTS Si/G als Coo sya/e"s/sTeleteuiea ager st etec, sunitsjatohe aie tems oretate mesvaleyeceeeees Me 30.00 60.00 25538. Grinding Machine for Bacteria, etc., Koch, as supplied by us to the laboratories of the Henry Phipps Institute, Philadelphia. With motor. Current and voltage must be specified in ordering. Dutyehreene ee eee ee 435.60 Duty Paid 33: eee 528.00 167 25542. 25546. 25550. 25554. 25558. 25562. 25566. 25570. th Ue aR H. Toh Oe eM Ay ess C1 ROS SMEPS VAS SiN: No. 25542 No. 25558 No. 25570 Grinding Machine for the Preparation of Animal Lymph. Devised for the thorough mixing of the ani- mal] lymph with the necessary glycerine. The lymph is poured into the conical shaped funnel and is carried by means of the revolving spindle through the cylinder. The spindle is of pure nickel screwed with a thread, gradually tapering from a rough thread at top to a very fine thread at bottom. The inside of the cylinder is also of pure nickel. The mixing spindle is run on a compound ballbearing and is so arranged that it can easily be removed for sterilizing and replaced without any difficulty. In order that the bore of the cylinder may be easily cleaned and examined the cylinder is cut into two halves and held together when in use by the clamps shown. The machine is mounted on a strong table with marble top and the working part is encased under a glass cover with hinged door. The cover need not be removed when the machine is at work. By means of this machine the lymph is thoroughly mixed in about 15 minutes without any loss of the lymph which is kept perfectly free from dust. As supplied by us to some of the leading manufacturers of biological products in the U. S. Complete as illustrated, for foot power, with treadle and driving wheel. Duty ate yy sais de eiversier = 142.00 Duty Paid........... ao eee 172.00 Grinding Machine, exactly same as No. 25542 but fitted with pulley for power driving. Duty Free.. sooo WA) Duty Paid): 5600.05. «ase cee 148.00 Grinding Machine, exactly same as No. 25542 but with electric motor for direct current and adjust- able resistance coils for starting. Voltage must be stated in ordering. DutyiRree sy enaedeeeise «see ee 204.60 Duty Paid: ..).. 5... cece 248.00: Grinding Machine, exactly same as No. 25542 but with electric motor for alternating current and with countershaft. Voltage must be stated in ordering. Duty: Kree sce eee = 994 50 Duty Paid. .sscn.:jela-iee eee 272.00 Grinding Mili for Lymph. Model of the K. K. Impfstoff-Gewinnungs-Anstalt, Vienna; consisting entirely of glass, permitting the whole utensil to be repeatedly sterilized. The complete outfit is mounted on an enamelled iron bracket with marble top, and water motor for driving built in. Duty Brees. ee eee ee 115.20 Duty: Paids5..55:.c0sc eee eee 158.40 Grinding Mill for Lymph as above, but with electric motor drive. In ordering please state current. Duty Free: 34.2 eee 204.00 Duty: Paid: 5... eee 280.50 Filling Apparatus for Lymph. Model of the K. K. Impfstoff-Gewinnungs-Anstalt, Vienna; improved con- struction, with complete equipment for the adjustment of pressure and blast lamp for melting the capillary tubing, on enamelled iron table, with electric motor. DutysEree ss .cc 2 cae ee eee 228.00 Duty Paid............: cece eee eee 313.50 Combined Lymph Grinding and Filling Apparatus, consisting of outfit No. 25562 for grinding, and outfit No. 25566 for filling. Complete, on enamelled iron table. Duty, Bree csurd soca eee 468.00 Duty Paid: ;.... 2. - chee eee 643.50 168 25574. 25578. 25582. 25586. 25590. Ne. 25574 Grinding Apparatus, Borrel, for Organic Tissues, Bacteria, Lymph, ete. The grinding is accom- plished by means of flexible steel leaves. The normal speed is about 2000 r. p. m. and the front (shown removed in illustration) is of glass so that the entire process may be observed. All the working parts may be readily sterilized and the machine is well suited for the grinding of moist. as well as dry material. DULCE aisles ciorerels netelaseiee 87.50 DutyPaideee-eereeee eee veseecese 105.00 Cryoscope, Friedenthal, for Molecular Weight Determination by depression ef the freezing point in physiological and clinical work. See Zentralblatt fiir Physiologie 1899-1900. Outfit consists of the f llowing:— Coating gate wate wooden cover nickel stirrer, one freezing tube with rubber stopper and one reezing rod. Thermometer, for the cooling mixture, from —20 to +49° C. in single degrees. Sarrer: for the solution, consisting of glass rod with platinum ring. Approximately 1.2 grams of platinum. Thermometer, Heidenhain, from +0.5° to —25° C. in;j;ths. Asin medical work only a few de- grees under zero are required in the thermometer, this thermometer is furnished with fixed graduations so that the laborious adjustment of zero in the regular Beckmann thermometers is avoided. When small drops of mercury are found in the enlargement at the top of the tube they must be carefully run into the tube by inversion of the thermometer. Complete outfit as described. DUE Hree ws. oes oe se eet esc 10.75 Stocke nes eae een eerie 16.25 Thermometer; Heidenhain, as described DOVES. < 0.0202 cloic o010.0 cee vec cee reise eee vincwcecees .. 9.00 Cryoscope, Drucker-Burrian, for Molecular Weight Determination by depression of the freezing point in physiological and clinical work, designed for small quantities, only 1.5 ee of solution being necessary. See Zntralblatt fiir Physioloyi, Band XXIII,Nr. 22. Outfit consists of the following: Cooling Jar, with nickle plated cover and stirrer. Freezing Tube, with cork ring and air jacket with cork for both thermometer and stirrer. Stirrer, of glass with platinum ring, approximately 1 2 grams of platinum. Thermometer, with fixed degrees as in Heidenhain No. 25582, from +0 5° to —5° C. in ~y)ths, total length 24 em, with specially small bulb designed especially for this apparatus. Complete outfit as described. DM aty Bree 22 ease cies slatstaictcic eave site 10.05 Stock? ascncas cr SIDS roto 15.25 Thermometer only, as described above........ ws tien OEY: , Peek Sete aR ne SAIC 9.00 169 No. 25602 No. 25606 No. 25622 . HTC _ No. 25630 No. 25630 Tanck 25634 25602. Culture Dishes, Petri, of glass, fitted in pairs. The 100 x 10 mm size is the standard Petri dish for bacteriological work throughout the U.S. The glass is very free from striae and will stand re- peated sterilization with a minimum of breakage and corrosion. Diameter: pmmi sd cas crs is:c:aiays reas ceiaaereiole eiele ae eteniont nicteis cree staiore eee arene 100 120 150 Depo thisernrm sets crers ters lsssverece re ciste sicicveyeTaievevcie elaveleteveeleretelsteceretsieeersvetereraenter iercrseetote 10 10 10 LW?) Ei ido cit eacoocneordn sosornuooDod can poor canodoonDepop.oapanoc.6cs 20 -40 -60 25606. Covers, Porous Earthenware, for culture dishes 100 mm in diameter; Bachit:scc2-seeeeee eee 15 25610. Culture Dishes, of glass, fitted in pairs, with top and bottorn surface as free from striae as possible, for cultures, mounting of specimens in gelatine, ete. Diameter; MMe.) 6 ote oe clei eeseiriese 40 50 60 80 100 120 150 200 220 240 Depthepmim bette er feist eee tries 10 10 10 10 15 20 20 35 40 50 erg pain erence cis eines crete agetetets sib) ely Gi eal 30 6.40 60 Ss -80) © <90) 1-30 25614. Culture Dish, of glass, with top and bottom polished, permitting the examination of cultures with higher power objectives than the ordinary blown Petri dish. So-called Pasteur dish. Fitted in pairs. DIAMECET AMT, 53 see Saiois s'ore sisi nce lavaleteie cise isin sue Ames eet lows sasha eerie etree een 100 100 Deyo tne eLMee epee rer. fotcyoxe stolaress vvelarcrereiclevonatetelnicleleteretenetevalccatsvaleiete eteictercverstelateletelcrcustetereeiels : 5 10 Sry pani hes rcieanrccesm: sats se, te sators ave sala overs, sve eussexevevenepel tre twee at oaeray ares eke tec lane nesta Se eee -50 50 25618. Culture Dish, of glass, fitted in pairs, with top and bottom of polished plate glass. Glass rings forming sides are cemented on at 600° C. in a special furnace. Especially valuable for photomicrographic work and use with microscope because of the freedom from distortion as compared with blown dishes. Will stand sterilization as well as the ordinary Petri dish. Per pair.............. 1.25 25622. Culture Dish, White Metal, Friedberger-Kanten, rectangular form, 250 mm wide by 10 mm deep. 3.00 25626. Culture Dishes, Gabritschewsky, as originally used for Tetanus cultures but as now used for growing tissues in plasma. The culture is made on the under side of the lid. The circular concave por- tion of the dish serves to collect the products of metabolism falling from the culture, the cir- cular trough around the bottom dish being used for water. By means of the apertures provided a plight turn o. the lid permits or excludes the entrance of air into the culture compartment. Per PMU RS so cscsisiny She wieye sare See aT HONG reel els ic fois ions 4 shave els icisyeis]aievapenatete peeves Grereueceilelere a eke CIS Oe eee eee 75 25630. Culture Dish, Porcelain, Neisser. Dishes are 100 mm in diameter x 10 mm deep and are furnished in both black and white glazed porcelain. COLOR: cas aie ccs a eer tate eee a Slap Wate “aT ALTIE ala ate ates aE EOS Te EE eer White Black | OF-{d | A Sate a Nein on Oe n a eIe or nia teonandee to sGs0050 0 -60 75° 25634. Culture Dishes or Moist Chambers, large double dishes of heavy glass, with loosely fitting covers witl knob. Inside heig thy m mex citeevstn rhe seiea etaleietelere- sig kee a aeee tee eee eee eee 70 80 Diameter of ‘COVErs MMs crores yeaa oe wie elvis (one Nake wi brers care Stale rovslsroleswivateisle oioletetee eaters 200 240 MACH: eco cie, ccs sovore eis iavove o lotete seretetatsteceresate suatate Syvel's aves ei oveye oiaieliovetere iefey austetarcnetetcleqevenere teens 1.25 2.00 25638. Culture Dishes or Moist Chambers, same as No. 25634 but without knob on cover. Inside heigthyirnme.227 3c coos restore taney oterer ool sos) -naleve ov ove sl otal tae coicte s cleaier een peter 70 80 Diameter, of}: cOVeL: WM <<< sisis.c.ce store i atotelesokere) soca ie orays aveietetavcrere ci eiers olepabeeteretetetercreterete 200 240 MACH stareictevoieieiovorclersislevelereiclatetelclevelateleloteletavckerelelovcietetereieteierereretsiererereietelersintersicleteteleteterststenters 1.00 1.75 170 il No. 25650 No. 25658 No. 25662 No. 25670 No. 25674 No. 25678 25642. Culture Dish Holder, Ravenel, for dishes 100 mm diameter, of spring brass, nickel-plated. A very con- venient device for handling dishes in the incubator and sterilizer. ANG LAG) GY oligo ya oe ap oe sanibo CoH OD OTOL EET SA nabEaatapDoUcEuAcaooosacoodcdoes ome 6 LOE NUS Shon wae ties Suna O OO OF AEOC Oe Gace Dice ees poncdoosoemsooonsoptacoce 50 75 25646. Culture Dish Holder, of polished copper, with removable inside tray. To take 100 mm dishes. Height Qu LINC eS etcrstate ese cenests ote soterae cece ee asec Fovasia cates cease cus fas sia racaycte' er ctuyslOctleleseyMated stot ne cohereneseust tele reyst sretate sisters = 3.00 25650. Culture Dish Holder, of sheet copper, nickel plated, with door and handle. For dishes 100 mm in diam- Gi ny eat NAGS) nosha aeun Go boe Gone DE OCC aD Ap nEE oC or SB ao DoD MO aAotic coe cao mec on racers 6.00 25654. Culture Dish Holder, rectangular form, of nickel plated copper. For dishes 100 mm in diameter... 6.00 25658. Culture Flasks, Koch. (Ga pacilyence nse onesras a oeieinie siete o.5 (sie oiae ale sive einle Giaiete Binion sche lee Cire yetboer 50 100 ACI Ee tea ia loa ie eharoiovangueva o's ai Sa eevee ares eyeveiie islets “12 alo 25662. Culture Flask, Fernbach, so-called Antitoxin flask. Shape as used in the Antitoxin EaIDOSEGE of the Philadelphia Board of Health, 8 inches high and 10 inches in diameter at base............ 2. 2.00 25666. Culture Flask, Freudenreich, with car ground on, 25 cc capacity............-2-2.-- 6. sees wee eee eee 35 25670. re with meer NG GRC YY-EACE og so ncosonnnosoooounnoddasnosedeceeone -40 25674. LY se Lister, forserum capacity 500 [ocean A BE EEO Go SO aon 6 SHE EE Te ae -60 25678. oe “ Miquel, with flat bottom and ground on cap. Capacity, ec. __ 50 75 100 No. 25694 No. 25690 25682. Culture Flask, Kolle, with indentation to prevent flowing out of medium. Flasks are about 3 cm deep. As used in the preparation of typhoid vaccine in the U.S. Army Medical Department. IDTENTTVET, Cian og nner cen Gn oh eae DOE ee Eeear ean oe teen ee an ase seme co 13 15 MAG Ta sreraeateyerereesetere iets ters eerste one eo Siar dk aiare nie (o sia. aisivetteecete eteee eed om cetera eres -50 -60 25690. Culture Flask, Roux, 220 mm Jong, 120 mm wide and 53 mm deep..................000ceecseeeseee 80 25694. *§ Piorkowski, 140 mm long, 140 mm wide and 50 mm high.......................0.0 -80 17] > yo) 4 an (=; 2] rae, a ae, fe) = > w (@) ° = vu > mes “< A be N I i L) |e] \ LEE | | ral | ‘| \ —— 2. Py | } | j | , ig t No. No. No. 25698 No. 25702 No. 25706 25714 25718 25696. Culture Flask, Martin, for toxin, Capacity tceieescaessaec BORE abs 125 250 500 1000 Bache pete hts aio Sve 35 50") act SinnZ00 25698. Culture Flasks, Chamberland. 3 : Capacity icOss.s-occ catia ae Cae ace a eee 125 250 500 1000 1G Sede < Ronan oy ai elor enact do aige aero eee 4050 60 80 25702 Culture Flasks; Miquel, pipette form: — «<4... 40..s0--60 =) holes ee .30 25706 Culture Flask, Pasteur, with side tubulations and constricted neck. Capacity, ce....... ajsleXepnfatesefesaraleceyeieatye fete ee ee ee 100 250 500 1000 Bache Sep ena PERE Gilanteiaa ier Tais eRe i) 50) |) eccO EES 25710. Culture Flask, Pasteur, Jena Glass. Same shape as above. Recommended because of insolubility of glass ‘during sterilization. Capacity 500\cc:..0...-...... 2.208 so eee 1.30 25714. Culture Tube, Gayon, 220 mm long by 20 mm diameter.............................-- ee eee cece ee 30 25718 se “Roux, for potato cultures, 155 mm long by 20 mm diameter... 10 5 t 4 - ~ f= SBSeae E fs e 3 No. 25722 No. 25726 No. 25730 No. 25742 25722. Cups or Cells, porous, of unglazed porcelain, for use in batteries, etc Here hit; emma eee ae 75 75 95 110 135 185 200 Diametermm-s--5-e- eee 88 50 | 00a __ 50 6 80 80 Bach 555 oko eee eee eee -10 15 18 -20 -30 40 55 25726. Cupels, Brownite, for assaying, are absolutely uniform in composition and density, give a lower silver loss than bone ash, and are guaranteed against breakage in shipment. They should be hot before receiving the button. Diameter inches’ ac eee eee er ae 1 13 13 13 2 iHeicht: inches?-cc cae meee ie one se), 3 g 1 13 er il 00. ec aoad See chs Oe eon iss 1.00 1.25 1.75 2.00 2.50 25730. Cupels, Torry & Eaton, of best washed bone ash. Diameter, pinches pees. sen eee eee 1 1} 1i i 13 3 3 1i 2 Will absorb, grams......................_ 10 15 20. 25 730 40 50 60 75 Or OOD cryxcyae ice cise ojos OO OE EE 2.00 2.25 2.50 3.00 3.40 3.75 4.00 4.50 5.00 25134. ‘Cupel Rake; of iron, 24 inches longes..-.2-sseeses osoess se. soe eee 5: care 4 sje hia oe Se en 45 25738. «Shovel, of iron, 24 ‘inches longi) c occ. osteo tee someone eee eee Eee . 45 25742 Cupel Mould, of brass. Sizes imchessase sc te raat nae Soe atch eerie enero oe eee ly _ =n 13 Bacher. arco tionesiccoceeate Siclsiaietelete alalaluielntatefalelalaiaisietsteleletstsielateletel=crstate 2.50 2.75 3.00 No. 25750 25750. 25754. 25762. 25766. 25770. 25774. 25778. 25782. 25784. 25786. 25788. 25790. 25792. Rael rh Ny “al iS mn wou \ x No. 25754 No. 25758 No. 25762 No. 25766 No. 25770 No. 25774 No. 25778 No. 25782 Cylinders, with spout. Height, HNtks o.cG0es0b0 000 GOOD OnODUOOEMEDOGOr 100 125 125 150° #150 175 +200 210 Diametersmnmeeeeermeciecieeeecmciiie ciara 2D 2 OS OO Each Bete Pene tates) civeveselalereieeve Statelale: <(eiel= sists suava's , aby AW Gh a Se Pe ey 4s JEGy Fa Tip MEL 55. opapoppnoosooodooDogaGeNE 250 260 300 300 315 350 365 375 450 Dinme terme secs sine cicis eieaielersjeiceis ee seis 40 45 40 50 ~ 65 50 65 50 50 DEG ALS < soSccongcanoposunbodensbesccconss Bey iy GS et I et) dD Cylinders, with rim around top, top not ground. Height, MAE cy afcreraosste ere eteteteialeieerevevels icine 100 125 125 150 150 175 200 210 250 Diameter, mm 2 25 40 25 40 30 30 4040 Ma Che eS see oiteis scsi sets as Sasi es aby ais sky ali a CA 2 e268 30 Height, mm..... 260 300 300 315 350 365 375 450 600 Diameter, mm... 45 40 50 65 50 65 50 50 50 EWN so s6ds.sanscncsgocosseseeossaease sc soy mij hi 7d ESO 60-00 obi do Cylinders, with enlarged top. Especially adapted for use with hydrometers. JECTS UN SSI SUES BOO oS abo be aioe REE ea een ate ne noe mormamecn 50 300 400 Diametersat Op, sMm' tr seve sss, 5o-) lsereye ema neic aye lsete se tiasaese Seveetsledaexe 50 75 75 s Seam L OU LOMIAYIUN Merete cvesersyeyeh a ofare/artlc\ ole ayava le) at wNajsicle el tererese choses 40 50 65 DEG Thosgoates ot obos Saernocne. 4300 E ne a oraR en Betaaronar ra eianon arcs co0 50 -70 -90 Cylinders, with ground rim at top for use with glass plates. erent, amine epee haat een eee cyarels cin sla gras g ciabieeneteis aisiele 200 300 300 400 DAME LET ITT ere eee eee eter stents io a aie lle evalelenctel Stevextislniclore iene 100 80 100 80 SENG T dd wily satel Hes cn ue A a 75 80 1.25 1.25 Cylinders, with side funnel for acid chambers, so-called “drop cups.” LEGIT OF (AW OG ie To os Jed Subba cBoSbOOeuE pep opnnAo RoencwEscoorsnncoowOnse _ 125 150 DEVS ko 28 tabs tee do adoace sad ors bo on SR oan uSnaapoopEarcorog soboradadestor -50 -60 Cylinders, Graduated, with single graduations, and spout, on foot. Gapacitiys Cassie cialis Ne set srvisye Si eek eal 15 25 50 _ 100 [re RAC a a: as ee ae 25 28 30 35 40 50 @apacitiyiCes accents ete eens sic lee 200 250 500 1000 2000 3000 | DENG Mii tip Ratt BO AOC OOO Ea aT ee 75 80 1.00 1.75 3.25 4.00 Cylinders, Graduated, with double graduations, and spout, on foot. Chpatibyccdneat seen te. ae. 5) 10 25 50 100 200 250 500 1000 2000 ACH iascvatetorsytovecioe osetia sist 28.30 -40 50 65 .80 1.00 1.20 2.00 3.50 Cylinders, Graduated, with single graduations and ground glass stopper. So ealled ‘mixing bottle.” CapacltysGeszcsncsaesici ec areee ss 10 Oa EMD) 100 150 200 : 250 | 590 1000 2000 ACIS setae etays cadavers aia oratelers ei slewictets Sia: 50 5d .60 .80 -90 1.00 1.15 1.35 2.30 4.00 Cylinders, Graduated, same as No. 25778. but with double graduations. Wapaeiiy iGO emcee eye ers see lwtals s alelel overs elelcieists 10.25 50 100 250 500 1000 2000 LOG Desoto Rd a SO CORB RER OO DEO CoE enone 50 .60 -70 80 = 1.20 65 2.45 4.50 Cylinders, Graduated, New Jena Glass, with single graduations. WAN ACIELY:, CGemrectevoste eee ehaets elereieia-. 50 100 200 250 500 1000 Wachee ase ae eee aoe eee rotaeinscie os 90 1.10 1.35 1.50 2.00 3.00 Cylinder, Graduated, for use with the official Brown-Duvel Moisture Tester. ing in percentages up to 16%. See Bulletin 56 of the U. S. Bureau of Plant Industry....... With eniarged top, read- -40 Cylinder with Outlet but without spout, of well-annealed thin glass guaranteed to stand repeated steri- lization; 4 inches in diameter and 15 inches high, with tubulation at the side; as used in the labo- ratory of Soil Bacteriology of the U. S. Department of Agriculture 1.25 Cylinder, as used in testing sewage, with conical end graduated from 0 to 50 ce, total capacity 1000 ce. 2.50 Cylinder, as above, of conical shape throughout, with graduations at points from 0 to 100 ce, total Gey eOniivge UNE Veet aaoundocad HBppo OoDDOOOONeononucind. - Gansanoauso poops oaccc0ogasoSSas 2.25 173 No. 25816 No. 25822 No. 25784 No. 25785 No. 25788 No. 25790 No. 25792 No. 25796 No. 25800 No. 25801 No. 25812 25796. Cylinders, Mixing, Precision, as used in the Hygienic Laboratory, of the U. S. Public Health Service for determining the immunity unit in the standardization of diphtheria antitoxin. See Hygienic Laboratory Bulletin No. 21, These cylinders are standardized at 20° C. in accordance with the requirements of the Bureau of Standards but are regularly furnished without certificate. With ground glass stopper without constriction in neck and with flask shaped enlargement below first graduation. Each cylinder of the series has a graduation of 10cc in “ths, i.e.. the capacity to the beginning of the graduations is 10 ce and to the top of the graduations 20 ce and so on up to 100 ee. Graduations, ce. 5-10 _ 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 Bach ccciscectsioee 1.25 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 CYLINDERS, Precision, graduated by weighing at 20° C. in accordance with the specifications of the Physikalisch- Technische Reichsanstalt, 1. e., witi indivi lual control number, time of outflow, all around g*aduations for the whole centimeters and semi-rircular graduations for the fractions, ete. These evlinders are offered with our unofficial factory certificate and with the Physikalisch-Technische Reichsanstalt cer- tificate and contro! stamp i.e., the official certificate of the German government. Because of the limited demand we do not carry these cylinders in stock with the official P. T. R. certificate but import them on special order. We do, however, carry them in stock with our unofficial factory certificate. These certificates are made out in the factory in exact accordance with the methods prescribed by the P. T. R. and no Cylinder is certified unless the error falls within the limit permitted by the P. T. R. The data on these certificates may be used as a check where cylinders are calibrated in the laboratory or with entire reliance upon the accuracy of the figures given. 25800. Cylinders, Graduated, Precision, with single graduations and spout, adjusted for receiving, with unoffi- cial factory certificate.. Capacity cesses 10 25 50 100 250 500 1000 Graduated in ce............. sy -§ 4 les mo 5 10 Bach sss.0,0 sac neras eee 85 1.30 1.55 1.35 1.90 2.35 3.05 25804. Cylinders, Graduated, Precision, same as No. 25800. but with double graduations; with unofficial factory certificate. Capacity-4oscmccmecciveesnces 10 25 50 100 250 500 1000 Graduated in ce............- is 4 t 1 5 5 10 MERCH: po Secasctecc saw asic eer 1.25 1.60 1.90 1.50 2.25 2.70 3.50 25812. Cylinders, Graduated, Precision, with single graduations and ground glass stopper, adjusted for re- ceiving. So-called ‘‘mixing bottle;’’ with unofficial factory certificate. Capacity, iceiseassneceneeeene 10 25 50 100 250 500 1000 Graduate inices ~s2.ce eee Sarees 3 1 5 5 10 Bache i eccrcins fee ee Sas ees 1.20 1.65 1.90 1.70 2.35 2.80 4.00 25816. Deflagration Spoons, of brass for burning phosphorous, sulphur, etc., in oxygen. Diameter of bowl #inchessc.coeee ne cee ee. eee Tne Ee eee 3 1 CH sss ayes ctnce, ccs echuset ada vwia ave ie eieie Stale eysit ho al aT eerie ch ne Sid ooo ae Oe ee 15 -20 25820. Deflagration Spoons, same as above but of iron. Diameter ofibowl inches cccxcwc crochet eer eo cec ote oraretec cai ba clo Sis sae ee aerate 3 1 LO | ESM Ce BSH aMr a eCuCOnneeconehorn een men atitic ornare oncn ona neOau oS 10 15 25822. Deflagration Spoon, for decomposition of water by sodium; with brass gauze bowl and wooden handle .50 174 No. 25878 25826. ij i : i 2 3 5 a c7 S00) 1.50 25830. Desiccator, Scheibler, extra fine quality, with wide, finely ground flange to which covers are evenly and accurately fitted. IDEM, TT Goan sodoousAascoocancdodEcECoaddEs 100 120 150 200 250 LOA ee Sows aocosdunscognin Hoo odoooonoooeocovecese 1.00 1.25 1.50 2.50 4.50 25834. Desiccator, Scheibler, exactly like No. 25830, 150 mm diameter, but with side tubulation to take MUD HELIS COP Pe Ke prctere erecta ce shaker eval evereye seve lain, Siei oleyoseter cpa. eyes oval ars TAL vecavane cm eseeapar are aMe rae Rete icici ieee 2.25 25838. Desiccator, Scheibler, exactly like No. 25834, but with a stout stopcock ground in side tubulation. Dae bel MTA Pree eer lererertetereteveleloleierelelele slate cvevere/ Tereteisrersiercl= 120 150 200 250 DEAN seco rons sosurascssadoogg ang guapodocboanadbanseauedca Has) 3.50 5.50 6.50 25842. Desiccator, Scheibler, identical with No. 25830, but with ground in glass stopcock and hook in lid. Diameter wl oO ham erc cytes cere clots avele’sioisiclefeleicls/elciecccelet nis sbaisrercucieyperserer sicher traraietehersioreiecietinvarevevere 3.50 25846. ce Scheibler, ordinary quality. Recommended as a very satisfactory desiccator at an unusually low price. Shape same as No. 25830. Digmetertein ches mer tran hick ister teicisl eters eis (tates wich carcrewiclevelstutem ieee cine 4 5 6 LOENG! (idiot NELSTS ORIG C CORR EIR eae It ace ee ean pain saad -60 90 1.25 25850. | Desiccator, Hempel, with glass stopcock and hook for suspension. Diameter 150 mm........... 5.00 25854. Porcelain Plates, glazed, especially intended for use in Scheibler desiccators. On three small feet and with from three to eight holes depending upon the diameter of the plate. ID MENTE TNs ocno doe ooodagoceanonoasooMAboosnoe 95 115 140 __ 190 240 LION cesodiddoansseadocoseasccsnoonooobpecoosede -75 85 Tes 2.00 2.50 25858. Desiccator, Atwater, with triangle inside, diameter about 43 inches...................-.0.-0000ee 2.00 25862. Desiccator, Mitscherlich, with glass tripod for taking beakers and deep vessels, 150 mm deep, and 100 mm in diameter, with tubulation and ground in stopcock......................000005 3.00 25866. Eixtravelass tripodelor: AbOverrayctercrcricyos ove teleres cisinleretavers eveue eieegaieveveratalevevetniera eieteleteycyeialteieieveletetsens 25 258.0 Desiccator, bresenius.. Diameters (MIM. «<<. \s..rs;sseis/etels escveke sine «10 c/ai=laiv ie eter sia cle eneisesv ears 80 100 IDINH sa onconeoonUnd Gg soon OUO DCE REDO Se omen ODEaSbcoonabocaqhacuddeconesaoGeobD 1.00 1.20 25874. Desiccator, Fruehling and Schultz, with glazed porcelain plate profusely perforated with small holes. Mise ter grmmiseaaeyseiei aera evoeie aioiate oie Soe siete cle lees sleleveretels eieveterelec rere oe tiaraetcls 200 250 1OEYY (he as opadncboconhecScbonEooETooDponEadndenopaddoccoopmoosdonoauuoonooueKLd 7.00 10.00 25878. Desiccator, Fruehling and Schultz, same as above but with stopcock in lid. ID icinAtae, Sead enone pba Gooneasonenoce oon eaoou oa ob UU oonoonabocdncddoncancad’ 200 ~—— 250 lOEYO (hon doadbads boo od nud Sido ROnmeb aneaeeD eo soon ooogouDmoUeeOdooooUuD DOU DOD 9.15 13.00 25882. Porcelain Plates, only, for Fruehling & Schultz Desiccators, glazed and profusely perforated with small holes. ID Ena oy NA Snog oaks abo ced yo oOUsUAU Roe pnd oanaocoooeDbendcadnsoopcddocdde 190 230 CHa eas eer ee TS RR cris, evecare so lapblacicva Yo aitapaite (ovareeaielistsseley ne raton Voie (ore aoverecteLerel fey 1.75 2.10 25886. Porcelain Plates, only, for Fruehling and Schultz Desice cators, with holes 26 mm in diameter for tak- ing crucibles. IDEA) Meee cas odo Go Od D USA Hane Do seudDopoULooSUnUAnoodDoOneoOeGKoNOOOUUOL 190 230 [OES eae PS ae Se I ee On et Pete San ot Saco cEcoOcode 1.75 2.10 No. 25926 i Givi = yy No. 25918 No. 25902 No. 25910 25890. Desiccator, stoutly made to withstand considerable pressure. With glass stopcock, rubber stopper and hook injlid. Diameter, 140 mm. =), 225.002 ;42 cn seins cence dae eee 5.25 25894. Stopcock, only, for’ No: 25890’ desiccator. ......0 cs see osee deaceee ec o- eck nenee eee 1.00 25898. Desiccator, rectangular form, a new, very practical model. grag 11 enn Pe ere Sa eee ar ae tobee a Sorte Sontimecoesacan ane aoc 145 185 iin, Sli Geese none mee rnenemeeenie hace Seren re nD LSTdand suc cdeieseesduassoodac 110 140 182 155 1211 el ee ae A Merah lea eek OE ae Th co (9077 Boa Che oops ctae ais sys 7efacsimicis sis eicinse,cntaie Diss TS em ISTO ROCCE CEs ee eee 5.50 7.50 25902. Desiccator, exactly same as No. 25898 but with stopcock ground in side tubulation, but without porce- lain plate as shown in illustration. Length, mm........ afafeyorsyeva'S\alesaleoteyeseheiaveustsjoetaseraie:storereravstolerst ale le\aveveret-tatec acint= Seer nena 145 185 LAA CHA Pen aye otters ia. 4.3% ca. 0 ORR RS TET reo oo 9.50 11.50 25906. Porcelain Plates, rectangular, glazed for use in either of above desiccators and as shown in illustra- tion of No. 25902. 1D} 3 78 0 en eee ee Ie Sen eee EE Ri We ee nis oc 125 170 Wadthigammmy 2 See ee Pere 50 Tongs, for the convenient handling and washing of the dialyzing shells, arranged for convenient open- ing and closing by simple hand pressure; heavily nickel plated..............0....0.0c0.000-. 3.50 Test Tube, with bulb to prevent boiling over and with two marks, at 10 and 12 ce and serial number. lDING NN gposmunnnoobgne bt GUe GS DO RES Dee nOO IO MEE OCT aon cmrotnie Bacon oc nn ala an eee Maem 4 Glass Bulb, with vents on the side for stoppering above test tubes. Each....................... .20 Water Bath, Abderhalden, with aluminum vane stirring device, of heavy copper, with Teclu burner reel Tah ae ay Ore Wee Al ooNce URL UDI Ve benaneadondoncaocsadc oo dussdcdeasSdonouaonbacenane 25.00 Ninhydrin, (Iriketohydrimdene hydrate). Per 35 gram vial. ...5.........-+-sccne ess hccscessecsne 25 SiligPeptone pelocchsts hers Cram. ssi02 ojs)siese le clsisierem sicicisccreee cla ceteo eee eee eee een -50 Blacentapepione pr Rer ETAL se ccie is socrcieiael- cine comieelcin Telaeeae eon eee eee eee ee 5.50 Dish, Boas, for feces experiments. Lower half of dish is black enamelled and upper half transparent. Withiair-tiphtirbbernrne andrelassispavulasasccreeseerce econ eenaeenaee een aan 3.50 Dishes, Crystallizing, of thin blown glass, high form with polished edges. Helehtymineesessse see) rt 50 60 80 100 120 150 Diameters mam sacral teeale 40 50. COO 100 120 150 5 16 -20 25 80 50 JOT S we cleaerocsoesonstanene 14 5 Dishes, Crystallizing, of thin blown glass, low form, with polished edges. Diameter Mn see eerie) 30 400506070 SO ee S0e SCO e110 130 TSO GS ae ae CCST 150 170 190 210 240 270 300 350 400 450 ACH ene eens can ainienet= oni: __ 40 50 -60 -70 90 1.50 2.25 3.25 4.50 6.50 Dish, Crystallizing, of thin blown glass with polished edge; as used in tanning laboratories. Height 50 mm diameter 70 mm. Approximate weight 35 grams. Each............................. 15 Dishes, Crystallizing, New Jena Glass, low form, with spout. ID ORIEN so encoosnecMdMeacer AC 50_ con 70 80 90 Bacheaeecs:.- Pee ce rier 17 .18 19 .22 COD . 100 125 150 200 250 300 Diameter, mm......--...- i" Each ee 38 -60 -80 1.05 1.25 1.90 No. 26016 No. 26020 No. 26024—small No. 26036 Ne. 26040 No. 26024—large No. 26028—large 26016. Dishes, Thiiringian Porcelain, glazed inside only, shallow form. Recommended as an inexpensive dish for students’ use. WapacitivecGrmectsicise ass seats lalate iteialel olor 20 35 50 75 125 200 500 750 1100 Didmeterwmmescs thes. dense 58 70 82 92 108 135 165 200 235 Bach sence Ginartoec ec eens nicl “ele siete ciate LO 08 210) 14 18) 9-20) 9 oes Capacity, cc........ 1500 2000 2500 3400 4300 5200 7000 10000 Diameter, mm...... 265 285-305 315-845 75S 450 Rachiorereoscseeer 80 1.10 1.40 1.60 2.00 2.95 3.90 5.85 26020. Dishes, Thiiringian Porcelain, glazed inside only, deep form, with heavy weltedrim. Same quality as No. 26016. Diameter, mm.... 65 75 85 94 112 120 150 170 210 240 265 285, Capacity, cc....... 3 50 75 100 170 225 450 600 1150 1500 2250 2750 achtssaaccsce esc S10 10a ae 30 ee 0 -70 095 7 F740) S70 26024. Dishes, Sanitaits Porcelain, trade mark “blue arrow,” glazed both inside and outside up to and in- cluding 120 mm diameter size. Larger sizes glazed inside only as shown in large dish in illus- tration. (CHIARA CObumqnonoecodepsoccose | 24!) 50 75 90 115 160 225 240 350 IDA ie aaapeaeaeondsaooT 50 70 80 8595 105 110 120 150 ache sorceress 08 10 a2 14 7 -20 30 35 55 WapacityaiCCacte-lracse os oes 700 1000 1250 1500 2000 3000 5000 8500 15000 DIAMCTER AIM saccitereciei eee eT sess 190 210235 255 275-300-355 400 470 1G heen daeoucopbonpmonocannnaT] -90 495) 1-35) 55) 1-957 2:65 Sb Ss SOS 26028. Dishes, Royal Berlin Porcelain, trade mark “blue scepter,’’ glazed inside and outside up to and in- cluding No. 5. Larger sizes glazed inside only and-for a short distance below the rim on the out- side, remainder of outside surface being unglazed. See larger dish of illustration. INIT Pe hoggnosoonepaabcosocOuNe 000 00 0 1 2 3 4 5 6 Gapacityaceles acest: eeace 35 60 80 100 140 175 210 300 385 WIAMELET WINING acer ic clereieieieeisve orele rf 60 70 80 85 90 100 110 120 145 Bach... crisccicniaes sc cee ess Beate 15. 8 wal 25 35 40 45 55 .70 INN DER ae.cce ccseesielacs tess 6a 6b 7 8 8a 9 10 11 12 13 Capacity, cc:.......-...... 930 690 765 1285 1430 2200 3250 5700 10000 16500 DiametersMM Ae... ee 3 _ 162 170 185 215 230-265 305 360 400 460 EACH ac ec cieiasets siete seieicwieeiove 85 -90 95 1.20 1.75 2.10 4.00 5.60 13.50 22.50 26032. Dishes, Royal Berlin Porcelain, same shape and execution as No. 26028 but with inside glazing of a dark green color. Ganacityn ccs sy. ae era etan ane lesen sae Hee ees Se 153 OEE oe cee 80 175 300 ID} Furia dail! hongacnEeSeaSGnoMnoor ope tOs doce GccareeeUocAansErocoodsa 80. 100 120 LE Ree ee ete i eEEEOOr acon Esa san Coascat Aa Goa meos -60 1.00 1.20 26036. Dishes, Royal Berlin Porcelain, shallow form, with comparatively flat bottom. Glazed inside and Capacity, €¢.....i0..00s00s005 45 60 95 160 200 350 550 Diameter, ~mm eves «ccc cles 70 80 95 105 120 140 160 BeGhs ca eine eo ase eee 20 25 40 50 60 75 90 26040. Dishes, Royal Meissen Porcelain, trade mark “‘crossed swords’”’ in blue, glazed inside and for a short distance below the rim on outside, remainder of outside surface being unglazed. Num bersccssermaccetriecciieincs 11 10 9 8 7 6 5 Capacity ce: cenesreeetreee 20 50 120 190 280 525 870 Diameter) MMe... cee elect 6 88 110 123 135 = 165s Bachtis. inet tnkwos careers 18 -20 35 40 -60 85 1.20 INGImber er. sis jas oot 4 3 2 1 0 00 000 Gapacitiy ices. «cesses 1100 1700 2250 3750 4750 6200 8700 Diameter mm sae ce Sees 220 250 275 300 340 365 400 DE AS RStaompS Sara aoe mma os 1.45 1.70 2.10 PACE 4.00 6.00 6.50 26044. Dish, Alundum, for incinerations, 45 mm diameter at top, 30 mm diameter at bottom, 22 mm high, with wall 2mm thick. These are furnished in either RA 84 or RA 320 mixture, which should be! specified ‘inlordering. soo5-micies -tesicte ce lad otal daa ala als ete af falda moe tal ese eel eater 35 178 No. d 26064 1] No. 26056 No. 26080 SSNS” No. 26088 No. 20084 No. 26068 No. 26072 No. 26076 26048. Dishes, Sanitiats Porcelain, trade mark ‘‘blue arrow,’ shallow form with flat bottom. Numi bert are os ate oe eck ee an lnpsieeds (Spans A Teton RO REENGT..S 00 Wincor ernriM rack see h na cease 70 80 95 105 120 140 160 180 200 DENG hehe ee ear erie Perr I Ni et eS 14 ah 20-24 Di Be ae 1 68 26052. Dishes, Sanitiits Porcelain, trade mark “blue arrow,” glazed inside only with wooden handle. CEYPAOUIN, COs condcosconoo Geman’ qoobdgonoo hy SeBsOEaBOEcSOUESC 40 120 200 525 DD PAIME COM PIN ere ctr e crccee aie eve ete sinieisieavele clave einiereei aouinte 70 100 125 170 LDEVG To dob cae donee b BOn GAD te ROOST CBR Ee TODA Dene nnaoe ete .30 40 65 1.35 26056. Dish, Thiiringian Porcelain, glazed inside only, with heavy double welted rim. Deep form. As sup- ; plied large chemical works. Dimensions 430 mm diameter by 305 mm Gl.) }Saoeaennoctone 12.00 26060. Dish, Thiiringian Porcelain, glazed inside only, with heavy welted rim. As supplied to large manu- RACTUTES | MO@APACKEYAECCHe camer ecee crete el ciie oa lslsc eicinie sioieteteretatelsisleolsracliale racers 12,000 24,000 PD IAMELEL BIN esas eer ote cee ovore a lero craig aii afore isis ise a) stele olejeteisiars Gime leer me ner ere ere “420 ‘600 LORD (ee tine See Sore BeOS ISCO CT He nein peea cr no mrroMnRSEaaNcD So gncb boc 4.75 12.00 26064. Dish, Royal Berlin Porcelain, glazed, flat bottom; 72 mm diameter by 16 mm deep................. 45 26058. Dishes, Best Bohemian Glass, round bottom, with spout. Drametervmmnver spss elserteicens eee 50 60 70 80 90 100 110 120 150 TOE GIGS Gels Sate AR Se 150.16) ISSUE Rose OSene dae asm 0 26072. Dishes, Jena Glass, round bottom, with stout walls. For many purposes may be used in place of porcelain and have the advantage of being transparent. With spout. Diameter gmme ee cone see cnccn ene 40 50 60 70 __ 80 90 FOE Neen oe anes ec are 5 16 7 20 25 29 Diameters MM ser COCA CCD en en eerie SMmArmconinaric 1.15 25 1.35 1.85 26088. Dishes, Opaque Fused Silica, highly glazed, shallow flat form without lip. ne used for ash determi- nations, ignitions, etc., instead of platinum dishes. Diameter MMs: ..s... soc sass sins sieve 0 35 44 51 57 60 70 Bach per pre narsn Seatac sboct beast sis 3 -60 come 90 90 1.00 1.25 26092. Dish, Opaque Fused Silica, highly glazed, for sugar analysis, of exactly the shape and dimensions of platinum dishes usually used for the purpose, i.e. 51 mm diameter and 25 mm deep, fattened: on therbottom and awithoutsalipes cere sere eiceeriastsieeta aereeeaietierionl tetra eerie areteeieloleters 1.25 26096. Dish, Opaque Fused Silica, for tannin analysis, 82 mm diameter and 25 mm deep, flattened on the [syohAterancnatel yabnioiny lNheHaponoeede sabes SHAaeeGruabocoUt soScocdor coat ude souanGacooo LU agdasoc 1.25 179 26108. 26112. 26116. 26120. 26124. 26128. 26132. 26136. 26140. 26148. 26152. 26156. 26160. No. 26136 No. 26140 No. 26156 No. Z61lou Dishes, Preparation, of glass, with flaring sides and ground on covers. DDPAIME TERM IMNE Mees ce oe esol cre ctenckevoreersieiosisiccetebevcielstelshererreiicietelorerren eres 40 70 100 Pe TUR eye aire ai ek cae uc Fed iS aval fo heyeTa ates eS LEIST «tee ye VR Tenoye ere PTE eee 25 30 35 Dishes, Preparation, of glass, low form. The lid is neatly fitted but is not ground on. 15 0-511 aes 00h01 te PR re ne en en Ph ea dar or 30 40 45 50 Diameterwmimi sarc a ccc oriole seeker 50 70 90 100 LORD eae tad Sono ease Geosooneonon aoeranEcotesae soe chp acaop -20 25 35 40 Dishes, Preparation, of glass, same as No. 26104 but high form, i.e., 75 mm high by 50 mm diameter. Very convenient for keeping clean micro slides onend. Each.......................-...05- -25 Dishes, Preparation, of glass, with cover with knob, accurately ground air tight on broad flange. Particularly convenient for use as receptacle for clean cover glasses. ISI RA Nip sat oc aouoopeGoDoEEooonbnoo douendcugcanes souamenvoDT 30 35 40 45 Diameter, TURTON orsepare wots erevots siatoheesterereoleieierleisvelele cers ereeteikbetaicieters 50 65 : 80 100 LONG (hea Sadie a aeer So Opnnerebncdnocs npnOobooUbecE aa apens oon 45 50 E55 65 Dishes, Preparation, of glass, so-called American Stender Dishes. Covers ground on. The largest size i.e., 90 mm high by 60 mm diameter is very convenient for clean micro slides. Hei ight, l1ab Ona Hee BRR SORA ROO ne soo USIS SOU SbGno doen soCeeEs 24 30 35 90 Diameter, MMMM sea elcid aictareisisiatersielieiniareieis actonctereice scares 36 50 60 60 1DEXH Wisc 6.00 Goce BREE aa aonb ache noo dadanecesourdess -08 -10 15 15 Dishes, Stender, of glass, for biological preparations, staining. etc., with covers of polished plate glass accurately ground on. These are the original Stender dishes of German make. Height; mm: - 525... 25 30 35 40 50 60 70 90 Diameter, mm...... 40 50 | 60 80 100 120 140 50 Bach ace ee nn 25 25 30 40 50 .90 1.00 50 Dishes, Aluminum, with straight sides and flat bottom, as used in milk analysis. JLB IIS VET IMT eye opera tee rarare chore har erate abs ove PeTe RG osu eevs Race otter ene Peete teterneee 65 75 90 IDE ai ly Tbe ooo npacgonde soobamunobonaode enn paoDOODGdd CO cUogonCaNbDDe 18 20 22 LOFT) RRS nna tine St coc ER ACHR eS aC ae uns odomaareb oor 2. 80 40 50 Dish, Aseptic Enamel Ware, of seamless steel white enamelled. Both acid and fire proof. Diameter As inches, depbhecamnehestrrratactreies- ici) osivecisi eevee eerie teraoteielclomietene ere oiticroiereselole eteteyeetetete tea -40 Dishes, Iron, lined with white porcelain inside and blue enamel outside. With handles and spout. Diameter mms. ae-eeeeeeseccher cere ci 100. 120 —:150 180 200 240 300 360 400 Beach's) or.cics,srauecsers eres ered ale aiaverereyetetale eratoes -40 50 80 1.00 1.20 1.50 2.25 3.00 4.20 Dishes, Lead, Diameter. inches..... _ 2 2 3 y 33 ae eS _> No. 26280 No. 26264 262605) Hooks and! Chains; nickel plated, with sharp points. -<..-2--ecen--eceeee ce nececaec oes eces .20 poooden Double Hooks;>of: steel cnickeliplated)iscctesecticc jon storysi teste yaaa eidereirs ae eanniosaniee sale a yxe 25 26268. Hnife, Brain, with very thin blade of finest steel, in ebony handle. Length of blade 185 mm, width 26 BRAD a TO COTO OORT CdD Oat CODOCOOBOUnO TOSCO OC OH B OAS OO doo Canin FOG ATOR OOO USoS Dem oe c 1.50 26272. Knife, ‘Cartilage, all steel, with nickel plated handle, with 45 mm cutting edge.................... -30 26276. (Prosecting Knife), with ebony handle and heavy blade thick at the back. Gengthiof cutting edge, mms. hid seisearcs «stele solo sere « elaterer sclerotic teravsieel ov rerepeeree 70 90 RCH 22 5 s.ctarsis cin eee Site eal ete aisles Rag onaqcosnocsusonacosespeocanonpesosapSceadGs 75 1.00 26280: Knife, Virchow, 3% inches length of cutting edge-....5<.2 0.0 ececenicesee ecliece eecdecoce sss eene 1.50 181 No. 26284 No. 26288 to No. 26312 Bone Saw, of steel, nickel plated, with detachable blade for sterilization. Length of blade 200 mm. 3.00 Needle, Dissecting, with ebony handle, straight and sharp, 1385 mm long......................:- a curv ed and sh arp: 130bmmilon gee. s see eee eee 35 ss ss cama & cs > (blunt: 130immYloneeens ecco eee 35 ss sé SSmoryes as half spear shaped, 180 mm long BREE aa ARS A 8 - 35 ss 7 spear shaped, with double cutting edge, 125 mm long....................... 35 ee harpoon shaped, with two cutting edges and 145 mm long................... -60 sé ss hook’shaped; 145mmilong.* <2 oe 6. cemesise seccc ss conse ae + = eee 35 Dissecting Needle, cheap form, sureiene: in cedar wood handle. Permdozen....5...:.s.-e + sees -30 GC & us Per'dozen:.....>...... cect eee eee -30 Needle Holders, of bone with damp holding any saan With one straight needle. Se LTT ee R ORB OU SUS oboe CUO UR EE pboeerioecnnnooctaaceSseccndnose tocdceces = 85 110 LOE) Wo ds Ged AS OO OC CEES COC ESTO TICE Hema ene Cen SoC eet aan n Henna anon s fod OS: 07 -10 Needles, ae Holder No. 26324, of steel, 50 mm long. Style........ A Ba Cc D LSC UGY bee acne OR AGtna oe Oodod te neo eae mabe caaAasee aac -05 07 05 05 Oil Stone; for sharpening’scalpels, 4 inches long........-..--.--222-+-0ce 2-22 2+ = oe ee 60 No. 26340 and No. 26352 No. 26340 NX 'B Cc D F and No. - 26352 No. 26336 and 26248 No. 26332 SCALPELS, DISSECTING, are carried in the following grades:-— 26336. 26340. Quality A instruments are of the best attainable quality, being made by the same makers and of the same material as the highest grade minor operating knives. Quality B instruments are of usual quality for general laboratory work. Quality C instruments are entirely suitable for students work where instruments are used for one course in dissecting only but are not recommended for permanent use where they are to be re- peatedly resharpened. Scalpels, Dissecting, quality A, in ebony handle. Bpecial shapes. Stylesin esa Pedic ge eee B C D E F G Length of cutting edge, mm................. 3 35 35 10 50 23 26 Bache Sos .cknse sewn dso nee ee 1.25 1.25 1.25 1.25 1.25 1.25 1.25 Scalpels, Dissecting, quality A, in ebony handle. Regular shapes. Length of cutting edge, mm............ eS a 32 38 45 50 Bacht, 2.26: eo cet ences camer ones 1.00 1.00 1.00 1.00 1.00 1.00 182 Age i iH Ui oR H. eee OmeViGg Ag aa CeO Me ea Aw ONE 3y 26344. Scalpels, Dissecting, quality A, all steel. Easily cleaned and sterilized. Hegular shapes. Hengthoficutting edge, MM. oo .cee ee oe woo ale cinese sis ee sees 25 38 45 LENG ESS condo o cone he SO OES EO GAOT HO GEES Soma Seo ee nee 1.00 03 1.00 1.00 26348. Scalpels, Dissecting, quality B, with ebony handle. Special shapes. Styles sexes cee ess B Cc EB F G Length of cutting edge, mm.. 35 35 35 10 _ 50 23 __ 2% JORG Ubsnognanco Ba ponGeGToonene 40 40 40 40 40 40 40 26352. Scalpels, Dissecting, quality B, with ebony handle. Heguls shapes. Length of cutting edge, mm......... ts ee a 32 38 457 50 Each.. 40 a 40 40 40 40 26356. Scalpels, Dissecting, ‘quality 'B, ‘all steel. Regular shapes. engthiofieutting edge ymmy,. 4....<-2 cele ee scree ie 25 32 _ 38 45 LOO (hae oS cas. Cat HOHeriS bps ASS Ce DEarE c Geeemerh > Hone ocn ara noss 45 45 45 45 26360. Scalpels, Dissecting, quality C, with ebony handles. =Hegiian shapes. Length of cutting edge, mm SAR aboan pombe 25 32 38 45 achwerer see 25 25 25 25 / i eat! A Curved Curved on Flat on Edge No. 26368 Curved Curved on Flat on Edge No. 26364 With one blunt point No. 26380 No. 26364 No. 26368 No. 26376 No. 26380 No. 26384 26364. Scissors, Dissecting, with fine points and screw joint, length 150 mm; regular quality. DOG V LO Asters eee eis rave ntpoves st clereyer al Sores vissa'dis lela Straight _ Curved on edge Curved on flat LORY 1s bc oct o SERAE 6 so cka n Seka Oh ie ye Cee nea a -50 75 75 26368. Scibsores Dissecting, with fine points and aseptic lock joint, length 150mm. Finest grade of surgi- cal scissors. Slylemans tease eee mee & icleete ais es ced Straight a edge _—- Curved on flat Bach ee ee ey. epee 90 1.00 1.00 26372. Scissors, Dissecting, medium weight, with straight points, 150mm long. A low priced scissors for SHUG GWOT Kers syerpa wsirelare iat are. o cose s = 0)0 evs wis /a¥eiasoaiee ciel afe wie RVaEEO ease OPO ENA Tinie Te ciepiaecioies = 25 26376. Scissors, Dissecting, same size and style as above, but better quality.....................2..2... 40 26380. Scissors, Dissecting, medium weight, with screw joint, 115 mm long. P f SINGS cata oeec ee Gen CU OCU RROC ENED Sree eee ae With sharp points With one blunt point 1 DEN bite i ee 6 See eee ck eee ieee -60 26384. Scissors, Dissecting, medium weight, with one sharp and one blunt point and aseptic lock joint. Finest grade of Hf sureical scissors. Length, mm. = : 5 cys cenar el sgosyasaeavearal sor tervay ete 105 115 125 a ( ) ( a ) Each eed 90 1.00 26388. Scissors, Dissecting, heavy, with one sharp and one blunt point and screw joint. No. 26388 No. 26392 AGIA Bi DEN NOTIN yoy fesy cheese Vrnee aoa ay ofa. ave aii evess,0 sicinle casts ee 125 140. —si180 175 1 DEN Naseer nar che ain GOUT eI eRe IS ene ret ao as 65 .80 -90 1.00 26392. Scissors, Dissecting, heavy, 140 mm long, with both blades blunt and with aseptic lock joint. Finest rade OfSurelCalSCiSSOLs: .1)s.5 Siclocrs ss Se cisa ee oe eee ae ie estes 1.00 183 \ », Nay \Q il | ; iq 3 = cs < | gy S x IE No. 26400 No. 26404 No. 26408 No. 26412 Z No. 26416 and No. 26420 26424 No. 26440 No. 26436 26396. Scissors, Dissecting, Coronary Artery, with one probe point. As used in Johns Hopkins University. 1.25 26400. sf with handle of genuine ivory, for the finest invertebrate dissecting. Length of Dbladés 10 smmis cos). eis ciaetere stctnislcepereielcie ies era axial a va cieleyauere eee athetae Pee D one eee 3.00 26404. Section Lifter, nickel’ plated.) Lotalilength 100)mm, width18smm...../2. {.0-) ee eee 10 26408. with ebony handle. Width of small blade 6 mm, width of larger blade 10 mm...... -50 26412. asc: a. \ scones e eno nee coer teen eone t= 25.00 26508. Distilling Apparatus, Stokes Automatic, same as No. 26500, equipped with 1 gallon gasolene storage tank, connecting iron piping and gasolene burner; with tank arranged to hang on the wall along- side of the still. The burner for the 4 gallon size consumes one gallon of gasolene in ten hours. Capacityaper, hours call ons flerieckcso «x. fle ncis vas cial Seen Oe eee ane 2 1 OFA Ne ates oi cee Seis SOAS Acs Re AAG Ae eA Oe RPI cle coe ieee : ere 00 27.00 26512. Distilling Apparatus, Stokes Automatic, Steam Heating. SIDI sea aabuOnooD badd COOdan¢ Sone eee 1 2 3 4 5 Capacity per hour, gallons..... 5 10 25 60 100 Weight, lbs:------2-2------ ai 275 325 750 1200 1500 Weight, feet.- 2.22... sues 34 4 7 73 3 JOE Liebe en otsonobui ccd cn AS es Son C eet Cran 100.00 150.00 250.00 450.00 600.00 Among those using STOKES AUTOMATIC WATER STILLS, are the following: Kellogg Food Company Texas State College of Agricultural & Mechanic Arts International Creosoting Company University of Washington Diamond Rubber Company University of Missouri Keystone Watch Case Company Virginia Polytechnic Institute Alan Wood Iron & Steel Company Indiana State University Republic Iron and Steel Company University of Cincinnati Pennsylvania Steel Company Pennsylvania State College American Can Company Battle Creek Sanitarium New Jersey Zinc Company New York State Hospital for the Insane (Matteawan Pennsylvania Salt Manufacturing Company German Hospital (Philadelphia) E. 1. du Pont de Nemours Powder Company U. S. Department of Agriculture Philadelphia & Reading Railway Company U. S. War Department 187 26516. 26520. 26524. 26532. No. 26516 No. 26524 Distilling Apparatus, Barnstead Automatic, Type G, for Gas Heating, yielding chemically pure distilled water without ammonia, gases, or organic impurities; substantially built of coppen nickel plated. Capacity per hour, gallons De rehechete osistelele cece 1 13 10 LOETA ae ese a dodogs Obs Monn Sdod AOR Ie mn AEE mere 45.00 50. 00 7d “00 a 5.00 225.00 Distilling Apparatus, Barnstead Automatic, Type E; for Electric Heating, capacity 1 gallon per hour. LOUIE NR BE. Sn oc ae ODS COL noe ae ae icrnrcrcodoab ccc ooqaadcd 110 volts 220 volts LOE CG Utes ieciin aan ai coo noC nn Senet ann eabir: avsedoceue ur 55.00 65.00 Distilling Apparatus, Barnstead Automatic, Type S, for Steam Heating; of heavy copper and composi- tion, thoroughly coated with pure block tin on all parts that come in cont with the water. Capacity per hour, gallons..... 2 5-7 10-15 15-20 20-25 25-30 50 75 Each as 75.00 115.00 170.00 285.00 300.00 430.00 540.00 775.00 No. 26528 No. 26532 Distilling Koscreaee Jewell, for use with gas; highly recommended for their simplicity and durability; substantially built and all parts easily accessible; boiling chamber is Gs iron, enamelled inside and finished outside with aluminum bronze paint; condenser of iron. Can be furnished on order with copper boiling chamber, nickel plated outside and tinned inside. Capacity per hour, gallons::.........).....%.- SOR ese oR a = 1 1} Tea Cees NSIS SR INSEE eee Looe Se ee 25.00 45.00 65.00 Distilling Apparatus, Automatic, for gas. Of cold rolled copper, lined throughout with block tin, with top of retort removable for cleaning. Gapacitysperhourliterss-ce-co seas restos etree rarest Caecioraaerer a: 2 ch AQeRe, ie. Hy .UP R H. T? Hi O MH Ay -S Gy iO} Mir IR AW UNE ~Y: No. 26536 No. 26540 26536. Distilling Apparatus, Automatic, 11 inches in diameter by 13 inches high, made of heavy spun copper without soldered seams; capacity 2 liters per hour with a burner using 10 cu. ft. of gas per VOUT eee tani reer or Tarot Oe ele fos tue can tarereee(Slesseleioxs:s Ie Reis CS FEI ie ah Hn RRO EE 15.00 IronVeripod | fOmuUseawi ba Abo versull lias pce \lereleie cits cies aaisimca che etsicier= eleeieeiteisterens elaiersreereiere 1.00 26540. Distilling Apparatus, Femel, Patented, capacity 5 liters per hour; delivers absolutely pure and sterile distilled water. Highly recommended and widely used in Germany. Duty Free........ 1S Bee en 42.50 Stock: -- eee: Pi Pons ..... 60.00 No. 26544 No. 26548 No. 26552 26544. Distilling Apparatus, for steam, designed for experimental distillation of heavy oils and other liquids or solids requiring agitation with high heat. Wapacibyacallonster cc: prctasleisreicereiin- te /cversiniiclar5 , 1 2 3 5 LOE Oa pacipcnd ono U Ee OOO ROR nT CRO cence eran “13.75 24.00 36.00 42.00 54.00 26548. Distilling Apparatus, consisting of a tin-lined copper retort with zinc condenser with block tin worm, receiving funnel for cold water and outlet for ihe water. Capacity, gallons bans Be svototete svaveuagetetahs sussacesivie 6/s0e"s 1 2 3 5 Bachiemceeciccince ceils setiieteisice sien siemens Pp. 00 14.00 18.00 23.50 32.00 Note—For condenser only see No. 25048 and for retort only see No. 46012. 26552. Distilling Apparatus, Automatic, for making distilled water by steam heat; of heavy copper with steam coil near the bottom and provided with an automatic valve which controls the water supply; also water gauge and union for connecting with condenser No. 25048 or other form. CWADACIEY pt EALLODS secre ee tatererets etstascusteivietcsnsarstetolekelaiste yatta roricler veietsieoresersheretare 3 5 189 > 26560. 26564. 26568. 26572. 26576. 26580. 26584. No. 26556 No. 26560 No. 26564 Distilling Apparatus, of heavy copper, all seams brazed, intended for high temperatures; with flanges secured by six thumb screw clamps, easily taken apart for cleaning. Canpacitivay paloma ya parece terete sclove «ole ezele le ieiese steel spev=) tee teteretste 4 1 2 3 LOA the canes coc an aboouUnb top D HOCUS SOGUUU EOD ECOUOOGO S10 23.25 25.50 36.75 51.00 Distilling Apparatus, for Determination of Ammoniain Water. The inlet tube permits the introduction of the permanganate solution into the flask after the distillation of the free ammonia; with mer- cury seal providing a perfect joint and easy disconnection................ 0... se eee ee eee 7.00 Distilling Apparatus, Vacuum, for evaporations or distillations under diminished pressure. Consisting of a porcelain dish 160 x 80 mm, 2 liters capacity, glass dome with tubulation for thermometer and side tube, and rubber fitting between dome and porcelain dish. Without thermometer.. 7.50 i i No. 26568 No. 26584 Distilling Apparatus, Vacuum, with cast iron water bath, white enamelled inside, and tripod, but without burner or thermometer...........-.-- RM estate ccone se sec sosoccce 10.00 Porcelain Dish only, 160 x 80 mm, 2 liters capacity, for either No. 26564 or No. 26568...... 5.00 Glass Dome, corliyy. 2.5. ccsssjcchsssiesclstiers esac fesce oss 2) ws slebel > o/sieakecelscs: Seo easel eee 1.75 Rubber’Rings only. cis socio ott cise corer ete neie 22) os stsas pate ave foloceniay nyse pee 1.00 Distilling Apparatus, Vacuum, consisting of copper water bath with stopcock, on tripod, porcelain dish with glass dome fitted air-tight by means of gasket and glass side tube for side of dome, but without thermometer. Capacity of porcelain dish) iitersteme.-m scene ies iis elias set eer eeaene ib 23 Machine te ee ee ee eee ey eee 2S eae te a eee “22.50 30.00 190 No. 26588 No. 26698 26588. Distilling Apparatus, Vacuum, same as No. 26584, arranged for distillations but with the addition of vacuum pump, condenser, gauge and glass bottle. Ch mnoiay G7 pon bimn Chey, IGE sop sabagouedonaspcocobcsanebesongeososusec ib 2 ae LUNE cdisooduebaeicdodanEaceds Es senor daa aoOUoUp oe muorocoabncussccnous 2805 aot Ne c50s@ a SORD OO OHInNS Gon AR Gens aor 6 sea ln an taosUsaupSncboneSccodnnbapcoaded me 55. 26592. LICE A ITE Onis aan Stn MIA 6 ones coon qdsonrscoossnTonecoocgDmocouner 7.50 10.05 26596. GlassvDometonliye cree steele ners ats bce arnselelote lola tae ees 3.00 4.20 26600. Glass) Sideplubesonlysrecrnise aan aale oe ecto oltre oie ore Tre reterateaeist a eter 45 -60 26604. Rubberskings sonlyaeereere see eee rice eer eile eee eran 85 1.40 26608. Glass Reservoir with metal top, with tubulations, gauge, filter pump andstand. For use with No. 26584 in place of gauge, condenser, ete., as listed under No. 26588. Duty Free.. ai Ae OR E7250 Stocke 5 Up iae er iebcae ees, Ld25 SS) No. 26612-16-20 No. 26624 No. 26632 26612. Distilling Tube, plainsform, for fractional distillation ser qsejereeie etre ete ere fee tekeele ele sl ialelelone 15 26616. mrdthorieybullbe-Meeeee oo... ome Adics oae e re s -20 26620. « Gs Sine) lS: oko Jenene eee o raBebood0o 4 0u0S dade cone aogdnenceogobpapadomeaueoe 25 26624. sé “ Glinsky, with glass valves. Mera et pI TU reteset ee renee teveece aca ie. oles sieinte lcetshesosat cnetesovenoaiereneus) shel svenels 4000425 460 Bae Ne ris cere ev state: comes a ory once tesla slate: (asa are id ea avers) eevee oer ere aoTonsrs atals 1.50 2.00 2.50 26628. Distilling Tube, Le Bel- Henninger, With two» DuUlbsis pester oo ce Fate ara ere ra erare ey ioetarrete 1.00 26632. 6° tren ess fae Sica Peels Susteren ed ra ects ra aout alias aseeauaeaysrecs 1.25 26636. « Le sf fs £6 oF OUT eae Piscean esas tkel® NEVSREIA Ete col TORN looker axe tere peeete 1.80 191 AR Ne eae eR H. hl (Oo Mr FAs as COM Se ANE, il MO I ‘* mu mua J — Mw R:KATTER=BERUIN== No. 26640 26640. Distilling Apparatus, Vacuum, consisting of metal retort heavily tinned inside, with steam jacket and stopcock, with drip cup, stopcock for live steam connection, glass dome, copper condenser with block tin tube and filter pump, and glass overflow reservoir with metal top and pressure gauge. Very stoutly built for heavy work. Capacity, of metal panw liters. sstien +. oes soccer eee ee eee ee eee 7 12 LDA HD ee Ro ierrcere Sd lcidtiid tS Gc crete OA eens ett one ote os er eo 2 0 95.70 108.90 DTPA fal 62) (1 Pee 8 ocr ee oe cee a ee cet ene Oe ha bao Nt-6 oc 145.00 165.00 26644. Porcelain Dishes to fit inside of copper retort of No. 26640. Capacity of porcelainvdishwlitters.jo.0. 5. ...snn ance cee ceneace earner eee 5 9 1 boss 14 rhb 2170) rll Ds} eee Onn OIE Se cee aM ae Siow arab dc oc 7 12 View in Office View in Office 192 No. 26648— For two trays 26648. Drying Apparatus, Hearson, for serums and other sensitive and easily decomposed liquids. This ap- paratus works without vacuum and renders possible the rapid, safe and antiseptic drying of the most delicate liquids at a low temperature. Two liters of serum can be dried in from six to eight hours which, with a large vacuum apparatus as formerly used, required at least 24 hours. The intake of air is filtered through a flannel filter and, after passing through the heating chamber, reaches the drying compartment in which are placed the trays containing the liquid to be dried. The warm air, after having become charged with moisture from the contents of the trays, passes out of the apparatus. Baffle plates insure the direct passage of the current of air over the trays. For most work a temperature of 25 to 30° C. is maintained in the warming chamber, temperature of which may be noted by reading the thermometer. The apparatus is provided for either gas or electric heating as may be specified but for most work we recommend that electric heating be used both for heating the chamber and operating the motor by means of a resistance on the same circuit which makes it impossible for the heating or the motor to operate alone. The fol- lowing experiment shows the antiseptic conditions under which work may be done with this apparatus :— ‘ Two liters of running water 1 ce were set. It grew 25 colonies of which the larger part was washed away. The running water was then divided into the four receptacles of the machine so that 500 cc was in each division. The air ventilator was operated for five hours and the ingoing air warmed with the following result -—— No. 1 Compartment—Water loss 180 grains—1 dead colony in 1 ec. No. 2 —128 grains water evaporated—9 large dead colonies in 1 ce. No. 3 ce —166 grains water evaporated—2 large dead and 7 living colonies in 1 cc. No. 4 < —123 grains water evaporated—7 large dead and 4 small colonies in 1 ce. From this experiment it is evident that the germ number of the water by the drying process has not been increased but considerably decreased. In another test sterilized water was used and the air admitted was not warmed. In each compartment 250 ce of sterilized water dried for five hours, after which 1 ce of each tray was tested. All four tests remained free from germs. Number of trays. 5) Duty Freese eee ee eae eo sabe Pa Noeorsie, sro oe ae ae 172.50 195.00 225.00 Dntyy Raid eee ee Rosa 2 aol tee nace eee 258.75 292.50 337.50 No. 26652 No. 26656 ZR — AD AR AIO LESS WG) eae doe ae Se SOIC ICO aE LACIE | aon cas SE OIRO RO bgp OUr ede = 26656. ie fs Vanier, for zinc, being ‘‘E”’ of the Vanier Combustion Train p. 150.............. 75 26660. oe e a “ sulphuric acid, being “‘F”’ of the Vanier Combustion Train p. 150..... 1.25 26664. “ s “~ Combined Potash Bulb and Drying Tube, being ‘‘G’’ of the Vanier Combustion Train p. 150 a > ve) 4 ab C o) = 4 ae) ° = > Wn a e) KS uU > z < a A K ‘oe t er mm “il No. 26668 26668. Drying Apparatus, Faust-Heim, designed especially for serums and easily decomposed fluids. As furnished by us to leading manufacturers of biological products, Henry Phipps Institute of the University of Pennsylvania, etc. Illustration shows form as made for two dishes. The two larger sizes accommodate three and four dishes, respectively. For gas heating. Mortakemdishes peer eeeeer recent eee Greist ete eeierer 22 3 ie IDA 7M ons qasusdsonon ns ooonoosoonasneaoneeanooddoesonsscses 196.00 216.00 245.00 IMMA IEA joan cdusscsconcodondd6 nqsdesons Une OOOdUGd Ga passes05s 237.60 261.80 297.00 26672. Drying Apparatus Faust-Heim, same as above but for electric heating. Price includes electric motor. Toltakesdishes:sa.ee esse eee Sennen eco dshacos 2 3 4 DLA) Ce Ge Ad odon sco unessHbDRDOUdSC Osu EoncCoonDGaDsOnaHccoro 208.75 236.00 272.25 DALLA ERs bs spo aco con ooudduanpoecusooNGSdGoOeAacUScEsS¢ 253.00 286.00 330.00 No. 26684 26676. Drying Apparatus, Buxton and Beebe, modified by Taylor, for the rapid dry- ing, at low temperatures, of easily decomposed organic products. Of heavy polished copper with motor and burner for heating which is not shown in illustration. Price does not include dish. Voltage must be Stated iniorderingias. ase eeeee ee eoentete cit icici eee 85.00 26680. Drying Closet, of glass throughout, with nickel plated brass mountings. Inside dimensions 10 x 12 x 10 inches. No. 26688 Duty Brees .ss2-- 4-6: 19.20 Stocker oc eee ee eLoU, 26684. Drying Closet, same as No. 26680 but with two compartments and two handles. Duty Brees oo ese ee eee 32.00 TOCK. o.6 ocscc ce ci eee 48.00 26688. Ebulliometer, Dujardin-Salleron, original French make, in exact accordance with the official stand- and the degrees of Malligand Ebullioscope. Of polished copper with jacket around the burner, complete in case with accessories and thermometer..............-... esses cece esses eee eee 30.00 26689. | Special Thermometer, for above)... nije cic ieicieter els octeiels a)ste leisiey= ei aio et 10.00 194 mpere. No. 26704 No. 26712 ELECTRO-CHEMISTRY APPARATUS Storage Batteries Are Listed On Page 66 26700. Switch Board for the Demonstration of Ohm’s Law. By means of ammeter, voltmeter and resistance connected with open connections, the operation of Ohm’s law can be demonstrated to a com- paratively large class, C, E and R being easily legible from the three scales, in amperes, volts and ohms. Size 75 x 60 em. MNT es Sa late ea sc 49.50 Duty Baldr nen eee eee eee 59.40 26704. Apparatus for the Demonstration of Faraday’s Law and for the determination of equivalent weights, showing in a very instructive manner the separation of heavy metals from solutions of their salts, such as copper from copper sulphate, silver from silver nitrate, etc.. and at the same time the equivalent deposits of the different metals with the same current. The apparatus con- sists of two (or more if necessary) balances of the specific gravity type with rider pointer and scale and, suspended from one arm, the platinum cathode in the electrolyte. As anode a plate of the metal to be deposited upon the cathode is usually used and electrolysis established with a current of from .1 to .2 amperes. The illustration shows two balances set up in connection with ammeter, rheostat and battery. Price includes only the balances, set of riders and glass cell. See Zeitschrift fiir den physikalischen und chemischen Unterricht XXV 4, page 270 and Zeits- chrift fiir Elektrochemie XVII 1, page 45. 10.00 Dutyiiree ee isi ee yes eee Duty) Paid@eee ee eee eee erie as 12.00 Zoes me tectrodes foraboye| Olea). o2 <2). - cases ns ss ss Silver Copper Nickel Tin Bismuth _ Duty Free, when ordered with apparatus.:.. 1.25 AO -50 85 1.05 Duty Paid ts = a8 ay ape 1.45 50 -65 1.00 1.25 26712. Switch Board, Experimental, small universal, for currents up to 6 amperes and under 40 volts. With precision volt-ammeter reading to 0 to 40 volts and from 0-4 amperes; regulating resistance, etc. DutyehNee scr ee ee ee 28.50 Duty bade Ree erase CAN 26716. Switch Board for Electrolytic Analysis. This switch board permits the accurate organization and meas- urement of currents from 0 to 5 amperes and from 0 to 12 volts and provides connections fo rfrom 1 to 6 electrolyses. The prices given are for operation on accumulator or other low voltage circuit. Number of electrolyses....... 2 4 6 1 Rotalfeunrentpamramperes-ajs- 2-2. de. oes a 5 10 20 30 Molise eee eer eae eda. cractasterceee ae some dl 12 12 12 LDTAG ees See So Son ba en oO ee aaa Se earagctactetyes 48.00 89.10 109.00 130.50 IDA? JEN Les 3 aa oot aa One Sa een Emam EeerIe aoe aera e 57.60 107.00 130.75 156.60 Duty Free Duty Paid 4.05 5.00 6.90 7.25 For direct connection of above with 110 volts, extra per electrolysis 195 < 1k. Ey On Mi Aaa Cy 407 SMa sees N > vs) a a0 e ze] a0 No. 26720 for D. C. No. 26728 for A. C. ‘ . , No. 26736 26720. | Switch Board, Experimental, Model C, for 110 volts direct current.with precision milli-ammeter and voltmeter. Net weight 80 kilograms; size 85 x 70 x 30 cm. ‘ : Range of meters from 1 milli-ampere to, amperes...........-.----: 15 20 30 Dutythreenysee een S550 HO See OS cer toe LOTS 112.50 118.15 LD TUR EEG [a oe nce gcc er en, ne le ae Senne IBPACE 135.00 141.75 26724. Switch Board, Experimental, Model C, as above, but for 220 volts, direct current. Range of meters from 1 milli-ampere to, amperes............------ 15 20 30 | DutyEreey an: een ieee Skis ch ceyact ae ee CEE esate 120.00 123.75 129.50 Dutysbaldieee see eee : farers bac Sree eee 144.00 148.50 155.15 26728 Switch Board, Experimental, Model C. as above, but for 110 volts alternating current. Range of meters from 1 milli-ampere to, amperes.............-.---- 15 20 30 DD Wty re eva eers steer es sel PES As cos gels is « Mad RTS Te epee 108.75 110.75 116.25 Duty Raidky ences err. ce ee ae ea aaa 130.50 132.75 139.50 26732. Switch Board, Experimental, Model C, as above. but for 220 volts, alternating current. Range of meters from 1 milli-ampere to, amperes..............-..-- 15 20 Reees0b D tyoRre erry escent: eee ee sisie oes venient 118.15 121.90 127.50 DutysRaldes roa ees bdatcfe lee. & State Ohae PASTS Sane eee teers 141.75 146.25 153.00 26736. | Switch Board, Portable, for Quantitative Electrolysis, particularly recommended for teaching purposes board arranged to either hang on the wall or stand on the work table. With precision yolt- meter and ammeter reading from 0 to 10 volts and 0 to 10 amperes, respectively. Duty reese eee eee D250 Duty Paid’... Sec eee see O3:00 No. 26740 No. 26748 26740. | Switch Board, Portable, for Quantitative Electrolysis, similar to No. 26736 but with handles for convenient carrying and particularly recommended for factory and practical laboratory work because of the complete protection against dust and fumes and of the fact that the necessary accumulators may be conveniently placed inside the desk shaped cover. With precision voltmeter and ammeter reading from 0 to 10 volts and 0 to 10 amperes, respectively. With adjustable resistance, all necessary connections, etc., but without accumulators Dutyebree te oe a nee 70.00 Duty Paid. ......02- 52 82.80 26748. Switch Board and Work Table, Classen, for Quantitative Electrolysis, with precision voltmeter reading lators. Number of determinations................. Se RR ee aa Be a 6 Duty Breese. a8 Astinceties oe ae eee Cee RE nee soog AUPE 330.00 440.00 Duty Paid’: eet oe die ee sey ee ee ae so odan PD 400.00 532.00 No. 26752 No. 26756 26752. Switch Board and Work Table for Quantitative Electrolytic Analysis, for operation with direct current up to 5 amperes per electrolysis and at a voltage of 12 volts. Tables are stoutly made of well finished wood, with resistance, measuring instruments, switch, etc., on the upright switch board behind each table. Niuniberjomelectrolysesaeasacccdsoseeces see 2 3 4 6 8 Amperesudirect Currents acdsee cee 10 15 20 30 40 WD utyab ree yo. sccsren crseremisieis bios Btaanie Daemon S26 109.00 122.15 135.00 231.00 254.10 LOST Al TG Pte aati cons ania on ero ice ie eGo oe 130.75 146.50 162.00 277.25 305.00 26756. Switch Board, Veit, for Quantitative Electrolytic Analysis, with two gold plated rotating spindles, the polarity of which is reversible by means of switch; each spindle connected with six point switch, advancing the current from .05 amperes to .5 amperes, and additional switch from 1 ampere to 5 amperes. Ammeter reads from .05 to 5 amperes, with connections so that readings may be taken separately from either spindle. The container support will hold a platinum dish up to 3} inches in diameter, with platinum contact points to insure good metallic contact when dish is used as either anode or cathode. Complete outfit is mounted on polished slate slab 31 x 18 inches supported by angle-iron braces. This switch board obviously can not be connected with an alternating current unless same is transformed by use of motor generator set........ 100.00 26760. | Switch Board, same as above but with two revolving spindles. .... Re eerie comes s viet 150.00 26764. Electrolytic Outfit, Herman, for Quantitative Copper Analysis, etc., with revolving anodes and cathode of platinum gauze. Assays are quickly made. Cabinets are made up of any number of units, each unit having an indi- vidual motor so that one or more units may be operated at one time. Can not be used on alternating cur- rent excepting with motor generator set. The outfit is neatly mounted in a hardwood case with a glass door, which protects the motors from the nitric acid fumes. Complete in cabi- net with voltmeter and ammeter. Platinum electrodes are furnished at the market price of platinum. Ap- proximate weight of anodes, 4.25 grams, cathodes, 9.00 grams. Number of units..... 1 2 Hache ndesrqecterciest eich 100.00 120.00 Number of units.... 4 6 Bacheys see eee 165.00 220.00 No. 26764 AS aR, EO aR ols IPI Sl OO el NS Cy JO) SMe ae 7Al Nee Mh i i re hh No. 26768 No. 26772 26768. | Switch Board, Nissenson, for Quantitative Electrolysis, closet form. Cabinet is made of polished oak with three counterpoised glass doors (in the outfit for 6 determinations and two shelves covered with glass plates; each compartment is furnished with precision ammeter and pees: neces- sary control switches, resistances, ete. Without accumulators. INumberioh determinations sereeeeenn cas cose ane eee 6 8 =eOk Duty sree see er ee ee eae oe tee ee eC eee 528.00 660.00 792.00 DD utye Raiden ee ee oo nee Tee ee eee 640.00 800.00 960.00 26772. —_ Electrolytic Support, Fischer, for use with any of the switch-boards or work table outfits previously listed. With motor and electrode holder for all kinds of cleetrds and stirring devices, with regulating rheostat in the base. Current, volts........ MOG Ge a. c. and 220d. ec. Duty Free .... : Beit geese nae aie aes? 7AaF ; 51.25, Duty Paid ; 5 tS 56.00 62.00 No. 26776 No. 26780 No 26784 No. 26788 No. 26792 26776. Electrolytic Support, Fischer, simplified 1912 model. Current, volts _110d.c. a.c. and 220d. ¢. Dutyghreetist 5a. 07. Mice oe eee LaaRtes ieee 30.00 34.65 Duty Paid .. : coe 36.00 42.00 26780. Electrolytic Support. Fischer- Fresenius. for electrolysis without rotation as in elementary electro- chemistry; with double electrode holders and thermometer holder: 2). -e (eee 5.00 26784. Electrolytic Support, with japanned iron base, glass upright with ring with three platinum lugs and one clamp, and binding post attached to both ring and clamp...........................-- 5.00 26788. Electrolytic Support, same as No. 26784 with two clamps with binding posts..................... 4.75 26792. ss with glass upright carrying clamp and separate glass upright carrying ring.. 5.00 198 No. 26816 No. 26800 with 28616 No. 26796 No. 26820 26796. 26800. 26808. 26816. 26820. 26824. 26832. Electrolytic Support, Peters, adjustable as to height and with extension clamp. DTA Al IAS Se yess Aeneas meaBooee 6.00 Duty Paid SO nS OOhrs aOR Or Oae 11.00 Glass Stirrer, for Electrolysis, Fischer. Illustration of No. 26772 shows the stirrer attached to the rotating head of the support and in connection with the double net electrode.............. 1.50 Connecting Cords for electrolytic support, covered with red and blue silk, respectively, to show polarity, 80 cm long, per pair.. ee TE Be eT er eee TO Caney FU.ce Star Soa eee 1.50 Double Net Electrode,Pure Nickel, Fischer............ 0.0... ..ccccceesceeeeceveuveeeeteeenees 10.00 Note:—For Platinum Electrodes see Platinum Ware. Electric Stirrer and Rotating Anode Apparatus, consisting of motor which can be furnished for either alternating or direct current, 110 or 220 volts; adjust able arm for holding the anode or stirring rod with suitable attachment for electrolysis current and rheostat for regulating speed from 50 to 1000 revolutions per minute. Recommended for depositing metals in quantitative analysis. Price does not include crucible anode or dish shown in illustration, nor electrolytic stand with glass upright. Please specify voltage and current in ordering.................... see 2200) No. 26824 No. 26832 Speed Counter, Fischer, for conveniently determining the speed of the stirring device.. 7.00 Potentiometer (Compensation Apparatus), Fischer; a quick and convenient measurement and check of cathode potentials when determining and separating metals by means of electrolysis. The instru- ce consists of a rectangular walnut case with a convenient and handy arrangement of the following — A moving coil voltmeter for 0-2.5 volts with divisions of 0.05 volts; a moving coil galvanometer with pointer and scale divided 10-0-10, sensitiveness 1°= 0.000004 amperes; a current switch for the auxiliary battery; a key; a sliding resistance and four terminals with suitable connections for battery and electrolysis. The sliding resistance is readily removable for cleaning. See A. Fischer, Elektroanalytische Schnellmethoden. Enke, Stuttgart 1908 and A. Fischer, Chemiker-Zeitung Céthen 1909, No. 87, p. 337. Duty Bree ies so cisiact ee sicleleleieiei= Adecos Coe) Duty; Paid ic coatuacetane oan nlooe es 66.60 199 26836. No. 26836 No. 26840 No. 26844 Apparatus for Rapid Electrolysis in a Magnetic Field, consisting of a solenoid of insulated copper wire, inside of which is an iron cylinder to strengthen the magnetic field, the entire being covered by an iron mantle which serves to protect the winding and, at the same time, concentrate the lines of foree. Connections are provided permitting the use of the same circuit for exciting the sole- noid and conducting the electrolysis. The apparatus is intended for a 16 volt direct current circuit but may be conveniently used on regular lighting circuits of 119 or 220 volts direct cur- rent with additional resistances. Without electrodes.................2.-22--+e00ss+--ee- 21.00 GALVANOMETERS, DEMONSTRATION, designed primarily for lecture table use, with transparent scale 26840. 26844. 26848. graduated on both front and rear so that same is visible to the audience as well as to operator. With case and base of polished mahogany, with glass both front and back. These instruments are conven- ient for use as Galvanoscopes, i. e., for the indication of the presence and polarity of electric currents, or as Galvanometers as the angle of deflection is proportional to the strength of the current. They are made in two systems, i. e., the electromagnetic or soft iron system with air damping device, and the moving coil or Deprez d’Arsonval system. With the set of resistances and shunts they can be used as volt and ammeters reading from 0 to 250 volts and from 0 to 50 amperes and, in addition, they are offered below in both systems with special scales graduated in both volts and amperes. ; ; f Duty Free Duty Paid Galvanometer, Demonstration, with soft iron (electromagnetic) system, as above described....... SSR ene a5 aoe. Ee etn Sate See 13.50 16.25 Galvanometer, Demonstration, with moving coil (Deprez d’Arsonyal) system, 9S above Geseri bed meee Tae wens wale bso oa tead ye eRe eee ee 15.00 18.00 Set of Four Resistances and Three Shunts on Baseboard, for use with above Galvanometers. Can be connected singly with the instruments for measuring voltage from 0 to 1, 0 to 10, 0 to 100 and 0 to 250 volts and current from 0 to 1, 0 to 10 and 0 to 50 amperes ......................-- 12.00 14.40 DEMONSTRATION VOLT AND AMPERE-METERS. These consist of the above Galyanometers with special 26852. 26856. 26860. 26864. scales reading directly in volts and amperes as indicated. Demonstration Ampere-Meter, with soft iron (electromagnetic) system, for either direct or alternating current, 1 to 60 amperes...........--. essere 15.00 18.00 Demonstration Voltmeter, as above, 4to 100 volts......................... 15.00 18.00 ef oe i ey LOOM OP250ivolts...5s0< 1.0 oe eee eee 18.00 21.60 ee Combined Volt and Ampere-Meter, as above, with scale 0 to 12:yoltsyand OltolGramperes-- eceemerterricieeiisses «a. sclteeeeiereee ar 19.50 23.40 Note :—Please state in ordering whether instrument is to be used on direct or alternating current. Demonstration Ampere-Meter, with moving coil (Deprez d’Arsonval) system, for direct current only, 0 to 50 amperes............... 16.50 19.80 Demonstration Voltmeter, as above, 0 to 500 volts 16.50 19.80 Demonstration Universal Galvanometer, scale 2-0-2 milliamperes, 100-0-100 millivolts, with resistances by which the range is increased to 10 milli- amperes, (00/ohms and’ li'volisasase eee ies eee ee ais i testeiisterate 21.00 25.20 Separate Shunts, for above, from 100 millivolts to 50 amperes, each.......... 3.60 4.35 200 26896. 26900. 26904. ar MA No. 26900 Nos. 26908 to 26940 Showing Various Scales Galvanoscope, for Wheatstone Bridge measurements, determination of E. M. F. by means of the com- pensation method, ete., internal resistance 6 ohms, sensibility .02 milliampere = 1° of scale; diameters OOimimephereinies Ohman eeseeen 1. 9a 2 5) ee eee iene Into e lae 8.25 Galvanoscope, Paschen, with internal resistance of 10 ohms, sensibility of .002 milli-ampere = 1° of scale, and with an internal resistance of 6 ohms and a sensibility of .0002 milliampere = 1° of scale. In an iron case for magnetic protection. Sensibility must be specified in ordering. Duty Brees on. hes coc eects 5 IPE Duty Raiden eer cook bse 15.30 Galvanoscope, as above, in brass case. DutysBreey os. ccaenye teas Pues 16.35 Duty Raiders cere cee aceite saree 19.65 WESTON MINIATURE PRECISION DIRECT CURRENT AMMETERS, VOLTMETERS AND VOLT- 26908. 26912. 26916. 26920. AMMETERS, Model 280. These instruments embody all the well known advantages of the Weston instruments being absolutely dead beat and extremely sensitive and so designed that they may be left continuously in circuit under full load without overheating or causing an appreciable change in the indications. The separate voltmeters have a resistance of about 100 ohms per volt while the volt- ammeters have a resistance of approximately 50 ohms per volt. The cases are made of sheet steel finished in dead black and the dimensions are 4.6 x 4.4 x 1.5 inches and any of the instruments may be carried in an ordinary coat pocket. A great variety of ranges is offered, i. e., the voltmeters from 50 milli-volts to 150 volts, and the ammeters from 50 milli-amperes to 30 amperes. They are admirably adapted to all kinds of commercial and experimental testing falling within their limits of e. m. f. and current and are very adaptable for individual students use in laboratory work. Particular attention is called to the double and triple scale instruments and the volt-ammeters. The triple range volt- ammeter is in reality six instruments in one case, since there are three current ranges and three e. m. f. ranges. Range must be specified in ordering. Single Range Milli-Voltmeters. Millivoltg.0 21. tees von. nn. a | BO 75 100 120 150-200 aches gicccm.g sce et cas S20 12.50 12.50 12.50 12.50 12.50 Ni t—volitstenrceracetae ee. Ses 250 300 400 500 600. 750 ACH etarceeistie tase claunte eos eee | LPB 12.50 12.50 12.50 12.50 12.50 Single Range Voltmeters. Vicltst sateen tate ay Teas ‘Que 2 83= 5. (oe 10h 655 LOG (oaths cio meee cio 12.50 12.50 12.50 12.50 12.50 12.50 12.50 Voltsreen se Snr 25 40 BO ia oe ee oD 150 aches cities reacties 12.50 12.50 12.50 12.50 12.50 12.50 12.50 Double Range Voltmeters. Volts. 20-2 20-8 25-2.5 30-3 50-2.5 50-5 80-8 100-10 =150-15 Each.. 14.50 14.50 14.50 14.50 14.50 +‘14.50 14.50 14.50 14.50 Triple Range Voltmeters. Volts tome 0 _25-10-2.5 30-3-1.5 30-63 30-15-38 40-20-4 50-525 BACs. 3 syne wren oreSrene 16.50 16.50 16.50 16.50 16.50 16.50 Voltsscnui ves ae Stee 5025-5 -50-25-10 80-20-4 100-25-2.5 150-15-1.5 1150-15-83 Miah eVetinvyacoc eects ots 16.50 16.50 16.50 16.50 16.50 16.50 201 AD Rot hie ia H. Te (Ha O> UME s At as CG. (O:_>M> {Re Aa INE sy 26924. Single Range Mil-Ammeters. Milli-amperes devotees sae 50 75 100 120 150 200 Bach’ 2. 2s. ae 12.50 12.50 12.50 12.50 12.50 12.50 Milli-amperes. _250 _ 300-400 500 —_—__—si6s00 750 Bach sc 3. caer eye fos s-- 212550 12.50 12.50 12.50 12.50 12.50 26928. Single Range Ammeters. ; PAUTIPET CS See ticle tee eee 1 2 3 D Ged 10 15 25 30 aC Se ocrsrsnt series 12.50 12.50 12.50 12.50 12.50 12.50 12.50 12.50 12.50 26932. Double Range Ammeters. Amperes..... 1-0.1 2.5-0.25 5-0.15-0.5 82 10-115-1.5 20-225-25 25-5 303 Each..... s 13.50 13.50 13.50 13.50 13.50 13.50 13.50 138.50 13.50 13.50 13.50 26936. Triple Range Ammeters. j Amperes. . 5-2 5-0. 25 10-1-0.1 10-10.5 10-1-0.5 10-2. 5-1 15-3-0.15 20-4-2 : 20-8-2 Each.... 16.50 16.50 16.50 16.50 16.50 16.50 16.50 16.50 Amperes.... 25-2.5-0.5 25-5-2.5 25-10-2.5 25-10-5 30-8-1.5 30-6-3 30-15-38 15-3-1.5 Each. : 16.50 16.50 16.50 16.50 16.50 16.50 16.50 16.50 26940. Single Range Volt-Ammeters. - Volts... aa idan 3 3 3 Amperes : Se ae : 3 1.5 3 Py) Each Bier Tocris wfctonena stags = - 19:00 19.00 19.00 19.00 No. 26944 WESTON STANDARD PORTABLE DIRECT CURRENT VOLTMETERS AND AMMETERS. The illustra- tion used shows the general type of the instruments and form of mounting, ete., for all of the Voltmeters, Ammeters, Mil-Ammeters and Milli-Voltmeters listed below. 26944. Portable Voltmeters. Range, volts...... seo LEY) 150 150-5 150-8 150-15 300-150 300 450 600 Division, volts. 2 ul 1 1-4, 1-3, 1-5 2-1 Z 3 Se Bacht te... er 55.00 57.50 75.00 75.00 75.00 77.50 65.00 65.00 65.00 26948. Portable Milli-Voltmeters. 10 to 0 to 10 and 0 to 20 and Range, milli-volts....... 0 to 20 10 to 0 to 10 100 to 0 to 100 0 to 200 Divisions ere eee a. 100 100 100 100 aches. ih ea ase .. 50.00 50.00 55.00 55.00 26952. Portable Mil-Ammeters. Range, mil-amperes... 150 300 600 1000 1500 500 and 50 500 and 10 Divisions, mil-amperes 1 _2 2 & 10 10c 53 d os Bachem fae at ce: . 50.00 50.00 50.00 50.00 50.00 60.00 60.00 26956. Portable Ammeters. Ranged amperes ie inccj: ce noe hoe Eee eee 5 15 25 50 100 Division sim PeleSs se nen aok eR er eee 3 py + 3 1 BQ CHE cess rare leet era oo NSN ee 65.00 65.00 65.00 65.00 70.00 202 Ate Ries ie Oe OR lato i Ist @ Wl A 8 CeeO} OME, Ra aeAy ANE Ay; Slate Rheostat. Type F Universal Rheostat. Type U Rheostats, Ruhstrat, Simple Form of Slate, Type F, on aluminum feet, with holes for screwing to table, and prismatic contact. No. Amperes Ohms Size, mm Bue Duly No. Amperes Ohms Size, mm Duy, Duly 26960. 0.3 200 | 120x 30x15 | 3.15 | 3.80 27040. 4.0 60 450 x 60 x 35 9.40 1130 26964. S 400 160x 40x15 | 3.75 4.50 27044. 7.0 7) 120 30x15 3.25 3.90 26968. of 650 | 200 x 50x 20 | 5.45 | 6.55 27048. Be 3 160 x 40 x 15 3.80 4.55 26972. SS 1200 | 300 x 50x 25 | 6.10 | 7.25 27052. a by 200x 50x20 5.70 6.85 26976. v3 1700 | 400 x 50x 25 | 8.20 9.80 27056. by 8 300 x 50x25 6.75 8.00 26980. “ 2400 450x60x35 9.40 11.30 27060. = 16 450 x 60x 385 | 9.75 11.70 26984. 0.6 140 160x 40x15 | 3.75 | 4.50 27064. 10.0 .85 120 x 30x 15 3.40, 4.05 26988. 1.0 55 | 120 x 30x15 | 3.15 | 3.80 27068. os 1.5 160x 40x15 3.90| 4.70 26992. tg 150 | 200x 50x 20 | 5.45 | 6.55 27072. eg 2.5 | 200 x 50'x 20 | 6.00} 7.20 26996. Bs 300 | 300x 50x25 | 6.10 | 7.25 27076. i | 300 x 50 x 25 7.05 | 8.45 27000. a 440 400x50x 25 | 8.20. 9.80 27080. as 6 400 x 50x 25 9.10 10.90 27004. se 550 450x60x35 9.40 11.30 27084. se 8.5 450x 60x35 | 10.15 | 12.20 27008. 2.0 14 | 120x80'x15 |.3.15 | 3.80 27088. 15.0 3 400x 50x25 9.10 10.90 27012. oe 24 160x40x15 3.75 | 4.50 27092. 20.0 2.4) 120x30x15 | 3.40 4.05 27016. be 35 | 200 x 50x 20) | 5.45 | 6.55 27096. fe 0.4 160x 40x15 3.90 4.70 27020. ef 70!) 300 x 50x 25 | 6.10 | 7.25 27100. a 0.5 | 200 x 50x 20 6.00 7.20 27024. sé 105 | 400x 50x25 | 8.20 | 9.80 27104. 1 300 x 50 x 25 7.05 8.45 27028. ff 130 450x60x35 9.40 11.30 27108. fg 1.6 400x50x25 | 9.10 10.90 27032. 4.0 6) 120x30'x15 | 3.15 | 3.80 27112. fe 2.5 | 450x 60x 35 | 10.15 | 12.20 27036. af 10; 160x40x15 3.75 4.50 To prices given above add the following for extras as indicated, if desired. Extra for scale with ohm Extra for winding with wire Extra for Ruhstrat cross For Rheostats divisions of increasing diameter winding Duty Free Duty Paid Duty Free Duty Paid Duty Free Duty Paid Size,mm 120 x 30x 15 85 1.00 55 65 75 -90 ee 60 x 40 x 15 85 1.00 55 65 75 -90 SS 200 x 50 x 20 85 1.00 55 65 1.05 1.30 ss 300 x 50 x 25 85 1.00 55 65 1.05 1.30 oe 400 x 50 x 25 -85 1.00 85 1.00 1.50 1.80 ve 450 x 60 x 35 85 1.00 85 1.00 1.50 1.80 Rheostats, Ruhstrat, Universal Form of Slate, Type U, consisting of two resistances mounted side by side on aluminum feet. The two resistances may be operated independently, in series, or in parallel, each being provided with separate contact slide. This form of Rheostat lends itself to a great variety of experimental purposes. No. Amperes|Ohms _ Size, mm eed No. Amperes Ohms Size, mm Para ae 27116. oh} 9.2}, 200x 50x20 11.50 13.75 27148 1}| "9 }| 200x 50x20 | 11.00] 13.20 27120 «“ 91 300x 50x25 12.60 15.00 ZONE: 308} | 300 x 50x 25 | 12.00) 14.40 27124. “| 13) 400x50x 25 14.70 17.65 2D hal ae | 400 x 50x 25 14.35 17.25 27128. “| 18), 450x 60x35 16.75. 20.00 SUL “ 880) 450 x 60x 35 16.00 | 19.20 PUszee 15) 228 hom em NPS STi)IN on Nae te 7$) 83\) 200x 50x20 11.25 13.50 1.5) 83) 200 x 50 x 20 | 11.00 | 13.20 27136. “120 300 x 50 x 25 12.60, 15.00 218. pp } 300 x 50x 25 12.00 | 14.40 27140. “170\ 400 x 50 x 25 14.70 | 17.65 are fe) }| 400x 50x 25 14.35 | 17.25 27144. “| 250) 450 x 60x 35 | 16.75 | 20.00 a lie R800} 450 x 60x 35 | 16.00 | 19.20 203 AS Re sh He sURR gle ee Om Mier Aces Cc 70" (Mi Ra A ING sy To prices given above add the following for extras as indicated, if desired. Extra for scale with ohm Extra for winding with wire Extra for Ruhstrat cross Sizetmum divisions of increasing diameter winding Duty Free Duty Paid Duty Free Duty Paid Duty Free Duty Paid 200 x 50 x 20 45 55 45 205 75 -90 300 x 50 x 25 45 Pay A5 5d 1.05 1.30 400 x 50 x 25 75 -90 75 -90 1.35 1.65 450 x 60 x 35 75 -90 ats -90 1.65 2.00 Metallic Tube Rheostat. Type F Universal Tube Rheostat. Type U Rheostats, Ruhstrat, Metallic Tube Form, Type F, on foot, consisting of thin walled metal tuhes thoroughly insulated with enamel and wound with resistance wire of a special alloy which is so well insulated by means of a microscopically designed oxide deposited on the surface as to permit the wire to lie in contact. No. pereg Ohms Mength, Diam, Duty Free Duty Paid No. AM. Ohms Length, Diam Duty Free | Duty Paid 27180. 0.3 700 8150 30 2.65 3.15 27280. 3.3 | 42 300 =—50 5.05 6.05 27184. es 1000 200 30 3.00 3.60 27284. ss 60 400 50 5.70 6.85 27188. = 1400 200 40 3.45 4.15 27288. Ee 90 500 ~=60 7.60 9.10 27192. as 2300 300 8 40 4.20 5.05 27292. 3201} Fo 150 =30 3.00 3.50 > 2600 300 50 5.05 6.05 27296. <4 7.5, 200; 30 | 3.30 4.00 3 3600 400 50 5.70 6.85 27300. “e ll 200 40 3.75 4.50 ‘ 5500 500 60 7.60 9.10 27304. 3 18 300 40 4.65 5.60 1.0 150, 150! 30 2.65 3.15 27308. af 20 300 50 5.25 6.30 - 225 200 30 3.00 3.60 27312. : 28 400 50 6.10 7.30 F 270 200) 40 3.45 4.15 27316. s 45 500 60 8.00 9.50 ie 450 300 40 4.20 5.05 27320. 12.0) 1 150 3 3.00 3.50 rs 500 300 50 5.05 6.05 27324. 1.5; 200 30 3.30 4.00 s 710 400 50 5.70 6.85 27328. . 1.8; 200, 40 3.75 4.50 os 1130 ©6500. ~=60 7.60 9.10 27332. ee 3 300 40 4.65 5.60 2.0 25 | 150); 30 2.65 3.15 27336. 3.2} 300); 50 5.25 6.30 ss 38 | 200) 30 3.00 3.60 27340. s 4.4 400; 50 6.10 7.30 3 50 200 40 3.45 4.15 27344. “ 7.8 500 60 8.00 9.50 = 85 300 40 4.20 5.05 27348. 20.0; 0.25 150) 30 3.00 3.50 4 100. =300 = 8650 5.05 6.05 27352. ss 0.4, 200) 30 3.30 4.00 oF 140 400 50 5.70 6.85 27356. ¢ 0.45 200 40 3.75 4.50 oe 220 500 60 7.60 9.10 27360. sé 0.75 300 40 4.65 5.60 3.3 10} 150] 30 2.65 3.15 27364. > 1.20 Note—If Knorr flasks are desired with two } inch holes in neck for returnof flow of ether, an extra price of 10¢ per flask is charged. Extraction Apparatus, Ringer, with Hopkins condenser. An extraction apparatus well suited for continuous extractions from liquid media. The ether as it condenses in the condenser drips down into a central tube which permits of its escape through small openings at its bottom. The ether then, because of its gravity, rises to the surface of the medium to be extracted. This apparatus is well adapted for the extraction of 8-oxybutyric acid from diabetic urine. As used in the Laboratory of Physiological Chemistry, Medical Department, University of Pennsylvania. All joints ground air-tight. Inside diameter of extraction tube 38 mm, length of extraction tube 37cm. Complete with three flasksiground to fit@s.:< cn... - see cele soo oe iene eee 8.00 Extraction Apparatus, Friedrichs, for continuous liquid extractions. Complete with counter current condenser and three flasks, with all joints ground air-tight. The condensed ether from the condenser drops into the funnel tube of the extractor and reaches the bottom through the screw- cylinder. It then ascends and the new drops enter the liquid to be extracted. When the ether layer reaches the lower tube the excess runs back into the flask and the process goes on. By means of the stopcock funnel and the lower stop-cock, liquid may be introduced or drawn off without interrupting the operation. See Zeitschrift fiir anal. Chemie, 1911..........-- 15.00 Extraction Apparatus, Teas, as used in tanning laboratories; extractor, flask and reflux condenser are of heavy copper, the flask being of 1 quart capacity. Original form without side tube A. 17.40 Extraction Apparatus, Teas, as above with side tube A for flooding contents of extraction....... 18.00 Extraction Apparatus, Yocum, as used in tanning laboratories. The extractor and flask are of heavy polished copper, the latter of 1 liter capacity. The condenser is of brass ground in....... 24.00 206 No. 27564 No. 27556 27532. Extraction Apparatus, Cottle, frequently referred to as the Underwriter’s Laboratories form. See No- vember Journal of Industrial and Engineering Chemistry, 1912; consisting of a metallic spiral reflux condenser supporting a porcelain Gooch crucible by means : of platinum or aluminum wire. All contained in a specially designed, long neck Erlenmeyer flask, the whole apparatus being only 6 inches high and 3 inches wide. Specially recommended for use in testing rubber com- aOUAGIS Aa WAC Gin ype Ciel CoHenS honneeoanassudeswnasassancodcogoceserogcccoonscccos 2.50 27536. Extraction Apparatus, for Rubber Analysis, as recommended by the Joint Rubber Insulation Committee. See Journal of Industrial and Engineering Chemistry, January, 1914. This apparatus is in general like the preceding form but with a syphon cup for holding the paper extraction thimble instead of a Gooch crucible as used in the Cottle form. In addition, all of the dimensions are slightly different, being in exact accordance with the specifications of the Committee above TOPETMEG, CO jee sre foes eias Ses Ie Mane Cicce Seals o eiaya a9 pee sumcerape rac clare so/acn ec svatnvs a cateieteere arenes Bras 2.50 27540. Extraction Apparatus, as used in the Food Laboratories, Bureau of Chemistry, U. 8. Department of Agriculture. Parts are supplied separately at the prices given or the complete outfit at the total of the three prices. A—Cylinder, 203 inches long, 2 inches in diameter, except at its lower or sealed end, which is enlarged to diameter of 3 inches for a length ‘of 4-inches ecm rast t eee eee le 1.50 B—Condenser, 1{ inches in diameter, except at its upper end which is enlarged to a bulb 2} inches in diameter, to permit its suspension IN! PAG rs ss D 27644. 27648. 27652. 27656. No. 27640 No. 27644 No. 27604 No. 27608 No. 27616 Fermentation Tubes, for bacteriological work, small size; height of vertical tube 100 mm, outside diameter of tube 12 to 13 mm; with long tubulation for ‘plugging and bulb carefully made to hold entire contents of vertical tube; on “glass foot, unsTaduated ss se seme ed cD: Fermentation Tube, same size and shape as No. *27588 but without PISSS LOO uss se tytis aot ce ewe 15 “same size and shape as No. 27588 with glass foot and tube graduated in cubic QO ATITTCIO Ty hee oo ee ok ou eon ae alc odene Hotucdtoecn. 60 boo ddods aucncadeeoU sad doc pte rs!) Fermentation Tube, American Public Health Association standard. See ‘‘Standard Methods for the Examination of Water and Sewage.’’ Inside diameter of upright tube 15 mm, length of verti- cal tube 140 mm, diameter of bulb 38 mm, OnialassfOOES. yee SARE TANS Pele 35 Fermentation Tube, same as No. 27600, but w ithout ISSs TOO UP mee Me ee ee Tee -20 ee “without bulb, so- -called ‘fish hook”? form; height of vertical tube 100 mm, out- side diameter of tube 12 to 13 Fitba es Aa ae Tater tee mice ice eit tat ale A ae lee -10 Fermentation Tube, Smith, without foot, designed primarily for the cultivation of anaerobes, in exact accordance with the specifications given us by the author; carefully made as to all dimensions and as to the angle between the vertical tube and the bulb; in appearance similar to No. 27604. .30 Fermentation Tube Support, of copper; for 10 tubes without foot, of the usual size. Bice 2.50 Figures, of steel, for stamping steel, iron, bullion, etc. In sets of 9. RACHMARCHER A Peart earn eet! eR MepeR EDO OueIa yoo. guedareasten sane $ t Per set of nine..... Se AEE ae ee cicth Bos oA AES eee 00) 1.25 Files, flat, best quality. Length, inches....... 3 40 5 6 if 8 DE Ce at aid’ GUM CORO erin at enclO Meee -10 12 15 15 18 20 Files, round (Rat tail), best quality. Length, inches.............. 4 5 6 8 [DEVE sci S oth ob nbtts aot pee eione ae RRep Bar aee shih cane 10 a2 150 20 Files, triangular, best quality. Length, inches.......... 3 Bo 5 6 8 TDEYS tcthaSais MN rath aoe Sie rie ry eee -08 10 Se be 20 = Beets oes cordriaranras ae a ain oe Morice 05 No. 27656 Filtering Apparatus, Witt, with ground in funnel and ground on glass cover with side tubulation for filtering into beaker, or other receptacle, under diminished pressure. Price does not include beaker. The main body of the jar is 16 cm high by 12 cm in diameter and ground in funnel in C) Korea The MEN CI Oe taeda 15. cue EOR teen Geeta cd oo sea nteod soo oconopobeebocancon 4.50 Filter Apparatus, Martin, for filtering toxins or for filling bulbs with sterile liquid by means of a filter or other suction pump. “Consisting of Pasteur-Chamberland cylinder in special metal mounting with funnel and stopcock. All parts are demountable, permitting sterilization in the autoclave. Without stand, clamps or glass bulb these being indicated in illustration to show CVAD NAST IN HON hit oe ORR AAG REM SEE ISM aon dart oal donee ta ao poxone pan sec enuS 12.60 Filter Apparatus, Martin, complete with suitable support and clamps ..................+-.-...-- 14.00 Filter Apparatus, Kitasato, consisting of 1000 ce flask, filter cylinder with bulb and rubber stopper.. 2.50 Filter Apparatus, Reichel, improved form, for separating the bacteria in fluid cultures from their various products. Complete with special flask of about 150 ce capacity, filter cylinder and ING) O OTSV PEM EY Meisl oe c1n(6)sjH 00) 4 HOR aGk ORO ECE abe ae co poic op conn ore dec coor seto ge aposousasuner-o 2.75 209 No. 27708 — a, No. 27660 No. 27664 No. 27668 No. 27672 No. 27716 No. 27692 No. 27696 27660. ‘Filter Apparatus, Uhlenhuth and Weidanz, for filtering serums, ete., for immediate delivery into am- poules without exposure. With measuring tube on the side for measuring doses up to2cc. May be used with Berkefeld filter and glass ms antle as indicated in illustration, but filter cylinder and glass mantle with rubber stopper are not included in the price. It may also be used with Maassen cylinder No. 27708 by means of asbestos ring and rubber cap.. 6.00 27664. Filter Apparatus, similar to above but with Silberschmidt filter held in place ‘by ‘rubber band with asbestos ring. Graduations on the tube permit the delivery of accurate doses into ampoules by means of pinchcock. Price does not include filter cylinder:... o...<. +... 0.6 eee 4.50 27668. Filter Apparatus, same as 27664 with giass stopcock, but without filter cylinder................ 6.00 27672. Filters, Berkefeld, cylinders only with metallic head-pieces. As widely used in all laboratory work in the filtration of toxines and the preparation of sterile liquids of all sorts. These filters are furnished in three degrees of fineness :— “W’’=very fine or slow filtering. “N’? =normal or medium filtering. “Vv”? =coarse or rapid filtering. Unless other specifications are given, the ‘‘N,’”’ or normal, filters are supplied on all orders. 13 INUMbErs en Samer merce arte or. mates 1 2 Size inches on nase ee eee ees ete 10x2 8xi iy sel ag 15 oe eee ach: et cee 3.50 3.00 2150 nel 2 5 ns ane 200 27676. ‘Filters, Berkefeld, as above but with glass s mantle with circular opening in bottom into which metal head-piece is clamped. INUMDEES..0..2. 5. tieeeece ene ae Ate idl 2 13 3} 5 6 ach: <.: ....0c0. aes sp Os 4.25 moss 2.00 1.65 1.50 27680. Glass Mantles, only, for Berkefeld Filters, such as are included with the cylinder in No. 27676. NUMER: «.asccn tcc e Op sesame. ces Meee 1 2 3 5 7 Size, PID CHES ws ste acess eta erie cies ec nee, Aaa eile 4x1 Qixz 4Fxi% LEY (tints Sr eernins utah agouGootlra daaeee 1.75 925 .75 50 -50 27684. Filters, Berkefeld, Household. Can be screwed to any 3 inch bib faucet. In nickel plated mount with filter cylinder 63 x 2? inches............. Hg. cele ee ee ere PE nooo es 2: 4.00 27688.. "Extra Filter Cylinder; only.23.. se-ce secs cesses Gin sla se one Lee seen te 1.50 27692. Filter Cylinder, of unglazed porcelain, 200 x 17 mm, outside dimensions. As used in Kitasatos and Similar fIGETS: se oxida oe ee sels tie als psane: disci Sea Rn soe eee 4 27696. Filter Cylinder, Pasteur-Chamberland, Bougie “B, aa fine and suitable only for use with pressure, original French make, with glazed flange and abate 200 mm long by 25 mm diameter. . 1.25 27700. ~—*Filter Cylinder, Pasteur- Chamberland, Bougie ‘‘F,”’ i. e., of coarser texture and suitable for ordinary filtrations; same size and Shape as above. «. cn... 022 nec eee selec oe eee eee eee 1.25 27704. +‘ Filter Cylinder, Berkefeld, of same shape as Pasteur Chamberland, i. e., with glazed flange and nipple; may be used interchangeably with these in the pressure apparatus...............-......--.. 3.00 27708. Filter Cylinder, Maassen, of unglazed German porcelain with glazed flange at top, for use by the Maassen, Reichel or Silberschmidt method, i. e., with asbestos ring between the flange and the top of the filter flask; 130 mm long by 35 mm diameter.....:.....5... 2.2) 1.25 27712. ‘Filter Cylinders, Berkefeld, of the same shape and for the same purpose as above. Imengthysinches = o!2.ccet wc joer nsec eects «ite e cinns sin tetererorote 54 23 1 Diameter: INCHES. is eck ee Poe elo wie ite aioe Ree 1 & Le LET Ge cen areca OR etic obec b a5 Lo SUS aa On ROME sm smidoeh 4 a 2.50 1.25 1.10 27716. ‘Filter Balloon, Pukal, of unglazed Royal Berlin porcelain. @spacitivecess-cereerice sone eRe Eee nee eee eect rr 50 140 500 1000 Bacchi oot es a 1s ee ore 2s AR ei ee 65 1.00 1.75 3.00 210 > ee} 27720. 27721. 27722. 27724. 27728. 27732. Filter Extra “ Filter No. 27728 Apparatus for Pressure, Hill, for the use of hydraulic pressure. By this method the material to be filtered is separated from the pressure medium by asoft rubber membrane. ‘This avoids foam- ing and also permits the use of water instead of air pressure. City water service will usually furnish 40 lbs. per square inch, which is about three times the pressure of a vacuum filter. The force pump supplied increases this to 300 lbs. per square inch. At the left top of the chamber is a block tin funnel and tube, through which the liquid is introduced to the filter. To this tube in- side the chamber a flexible rubber tube connects the soft rubber filter bag. Within this bagis placed the Berkefeld, or similar, bougie, the nozzle of which fits through a bushing at the bottom of the filter chamber and delivers the filtered liquid below. The side funnel tube of tin is soldered into a brass nut, which, together with the tube, is readily removable for sterilization. There is a rubber washer at the base of this nut and a screw stopper in the funnel to prevent back flow under pressure. When filled the screw plug is inserted in the funnel and the contents of the bag may be subjected to the required pressure. The three-way cock enables one to admit water to the chamber, to close the chamber from the service pipe, leaving it under pressure, and to drain the chamber. The vertical pipe with pressure gauge at the top is an air pressure storage chamber and is for the purpose of keeping a fairly uniform pressure without continuous pumping. There is a vent cap at the top. This should be kept tightly closed. If it leaks, air will be gradually forced out and the chamber will be kept filled with water. In that case its usefulness would be temporarily impaired and, moreover, a single stroke of the pump would then raise the pressure beyond a safe point. Complete with one 8x1 inch Berkefeld cylinder and 1 liter rubber bapsaedsecstkces pstoascou Lui cde DAS eBeEueapouEcodeeoueDuaoDhat oc dont gates nDavEncoanUDaE 92.00 RupbersBag el liter Capaclt yee cis. aricis veh stay sss cisceusie o cycuese Oba cio crete cia ee eee eset ises eictareheinte 1.50 < SS AITO) oF: Kel N Gee niger ee Oe aaI Ea seme mimnde roca uocoau Gna ccdenc coCcadeers 1.35 Apparatus, for filtering toxins by means of pressure. As supplied by us to the Antitoxin Lab- oratories of the Philadelphia Board of Health. Consisting of a cast iron bowel, enameled inside, 20 inches deep and 6 inches in diameter, with air-tight cover held down by four wing nuts, and with pressure cock attached and bracket for fastening on wall. Attached below is a detachable, nickel plated metal cylinder with a ground in stopper, carrying a Berkefeld cylinder 10 x 2 mches) sericesucludes whe berketeldicylinder...--e ease ee eee nee ree ene eer 50.00 Filter Apparatus for Pressure, Chamberland-Pasteur. Original French make, with manometer, pressure pump and Pasteur-Chamberland cylinder. Duty-Free see ee eee 45.00 Stocks. pe eer ices 60.00 Filter Bags, of felt. @apacity quarts soo seria deer ae © ceees Fie cites ete ote 1 2 4 SIZE WINCHES ee eeevs sees avloetonis singe cere DeLee 7 Ain Some err psts) 93 x10 12x 133 Bacher tree cee eee Soticc er ieee Saale ae 50 .70 1.25) No. 27736 No. 27736 27736. Ultrafiltration Apparatus, Bechhold, as used in the Kgl. Institut fiir Experiment. Therapie, Frankfurt, a. M., consisting of a double filtration apparatus, one with stirrer and one with glass trough, with ground-on lid, separatory funnel, manometer and twelve clamps, but without the ultrafilter dises. Duty Bree qacec secre cnak cciesas .. 80.00 Duty’ Paid). x05... 15 eee 115.00 27740. Ultrafilter Discs, Bechhold, for use in the above apparatus, as used for filtering and separating colloids and ecrystalloids, albumenoids, albumoses, ferments, soaps, etc., as well as for testing beer, milk, etc. In Physiological Chemistry it is most useful in the examination of animal fluids such as urine, serous liquid, blood, etc., and in Bacteriology during the examination of the prod- ucts of bacterial growth (toxins and antitexins); while in Pharmacology, filtration of decoctions and extracts is facilitated by its use. The permeability of the ultrafilter to various colloids de- pends on its density, i.e., to the percentage content of nitrocellulose in the acid collodion im- pregnating the filter, i.e., the higher the percentage the denser the filter. A 43% ultrafilter will, generally, prevent the passage of haemaglobin from a1% solution. Small variations in either direction can not be completely avoided. Each filter is sent out between perforated pergament paper immersed in water to which a little chloroform has been added to prevent the growth of micro-organisms and the whole contained in an aluminum case sealed by a rubber ring, as after a filter becomes dry it is useless. The filters are impregnated in vacuo with acetic acid collodion and are supplied under the designations of 14, 3, 43, 6 and 73%, according to the content of nitro- cellulose in the collodion. The filters are 90 mm in diameter. 107, ID OSl em at lon wen cet citeerrehet hosel iaysla sratetarontte wicleloerant 1% US 7oe AL 6% 734% Duty PaidsperscaseciotwlOsee aes sess eee ee 90 1.20 1.40 1.75 2.00 References. Kolloidstudien mit der Filtrationsmethode (Ultrafiltration) von H. Bechhold, Zeitschrift fir physikal Chemie, LX. 3, 1907. Die Gallertfiltration (Ultrafiltration) von H. Bechhold, Zeitschrift fiir Chemie und Industrie der Kolloide, Bd. II, Heft 1 und 2 Ultrafiltration von H. Bechhold, Biochemische Zeitschrift 6, Heft 5 und 6. Uta anor und Ultrafilter von Prof. Dr. E. Bertarelli, Zentralblatt fiir Bakteriologie 42, nr 22 und 23. Ulirafiltratie von T. I. I. Buijdenijk, Chemisch Weklbad 1910, nr. 20. Die Trennung von Emulsionen durch Filtration und Ultrafiltration von E. Hatschek, Zeitschrift fir Chemie und Industrie der Kolloide, Bd. VI, Heft 5. Versuche zur Aufkldrung des zellfreien Gdrungsprozesses mit Hilfe der Ultrafilter von A. v. Lebedew, Biochemische Zeitschrift 20, Heft 1 wnd 2 Conférence donnée au 1er Congrés intern. de Brasserie le 25.7. 1910 par M. H. Van Laer. Pulsierende Ultrafiltration von H. Bechhold, Van Bemmelen Festschrift 480-433. Funktion der Nierenglomeruli und Ultrafiltration von Burian, Pfliger’s Archiv. d. Physiol. 186, 741-760. 27744. ‘Filter Discs, Alundum. ‘These discs can be advantageously used to replace perforated porcelain plates in many operations, obviating the necessity of preparing an asbestos mat. They are easily cleaned by reverse washing and ignition, permitting of their repeated use. They are supplied in two degrees of porosity RA 225 Medium and RA 98 Porous, which must be specified in order- ing. Edges are moulded to a 60° bevel to fit funnels. 2 Diameteryinchess.. 4c eee 3 1 3 4 5 6 7 8 Rhickness\sinches: 5 -eeeeeeeneee SG 5 a 3 te. ve! 7 aie: Ba chis ae pease ending oer eee 25 25 35 -50 75 1.00 1.25 1.50 1.75 212 27748. 27749. 27752. 27753. 27756. 27760. 27764. 27768. 27772. 27776. 27784. 27788. f AMT.ce No. 27748 No. 27752 No. 27756 Filter Cones, Alundum. These may be used in any 60° funnel by stretching a wide band of rubber tubing over the funnel. They have a large filtering area and can be thoroughly washed from all soluble salts and are recommended for the filtration of gelatinous and slow filtering sol- utions. They may be cleansed by reverse washing, reduced to a constant weight by ignition and used repeatedly. They are furnished in three degrees of porosity, RA 320 dense, RA 321 medium and RA 322 porous. Please specify porosity in ordering. Each cone is supplied with wire stand as shown a illustration. Wyame ten pincheserer Veer emacs cic nesses = eo Ae reeset 3 2 43 (CHPGINA Glaeser saaG scant soetodeo fAdooNadondesc Je 520% ee Lee gOOLT 4B 100 [Da hal eee Cae ae Sti 3 a eC RD 30 35 50 Rubber Gaskets for use with any of the above. o.<..6.- «> -s-1-4--eeere cane oe ese ennes« -05 Filter Dish, Alundum. Will fit into the top of any 60° funnel and affords a rapid means of filtering large amounts by suction. Well adapted to organic work. Supplied in three degrees of porosity, RA $4, RA 360 and RA 98. Diameter 5§ inches, capacity 400 cc................ 1.50 Rubber Gasketfor uke with above Dish... .....7.50c22t ce ee ee ee oe -50 Filter Paper, White, A. H. T. Co. Special. This paper is offered for qualitative work and general manu- facturing purposes, as being unequalled in strength, uniformity of texture and clear and rapid filtering. We have supplied this paper in large quantities to leading college and university lab- oratories throughout the U.S., for use in qualitative chemistry. Diameter; mm. 35508 4-2 ee <= 75 90 100 110 125 150 180 Pricewper 1007 es... 3. 10 stil 12 14 Se 20) .26 [Diameter ammeter e 200 250 330 _ 380 450 500 600 Peri00ss. oes ee: SE 46 70 SON 1.20 1.50 2.00 Filter Paper, White, A. H. T. Co. Special. Same as above, in sheets 480 x 480 mm. Per 100..... 1.36 Filter Paper, Gray, A. H. T. Co. Very tough and durable. Especially designed for pharmaceutical and manufacturing purposes. Diameters MMi sees eee 100 125 #150 180 200 250 330 380 450 500 600 Per 100s cenvacctatetexcte tietstntis Al 14) 182A 28 A060 76 «1-10 «21.40 «1.80 Filter Paper, Gray, A. H. T. Co. Same as above, in sheets 500x500 mm. Per 100.............. 1.25 Filter Paper, Baker & Adamson, washed in hy drochloric acid, very rapid filtering, all soluble salts re- moved (‘‘single washed.’’) TAMER SIME ce sreyereeleieiee esccaieverepeeesecsiis 22 55 70 90 110 125 150 RErslOD Roxen sees cea oe ales 15 -30 45 ca .60 85 Filter Paper, Baker & Adamson, ‘‘A”’ Quality, thin paper, very rapid filtering, for general analytical works very low ash. Diameter, mm. en ee OD 70 90 110 125 150 Ash in each paper. SSO ROA = 00002-00003 «00005 = «000065 = 000098 Rer Aloo sss aothesadsse tess -50 -65 80 1.00 1.20 Filter Paper, Baker & Adamson, “Be Quality, dense paper for filtering Barium Sulphate, Calcium Oxalate, and other troubleome: pprectpitates, also rapid filtering. Diameter, ADIN re ce ayere elon 70 90 110 125 150 Ash in eras Paper ees 00006 .00012 -00018 0003 -0004 0005 PerslOO reo es ere ee -40 -50 65, -80 1.00 1.20 ~ Filter eee Munktell, No. 00. For special scientifie work—washed in hydrofluoric and hydrochloric acids. -Cut in round filters, ee filters in a package, five packages in a box of birch bark. 90 Diameter, mm........... 70 110 125 150 Ashes eramsec/5/55001s 0. 000011 0.000018 0.000030 0.000045 0.000058 0.000083 Per 100) Ges os. seek <: -50 55 -80 1.00 1.10 1.25 Filter Paper, Munktell, No.0. Washed with hydrochloric acid, remoy ing traces of iron, alumina, lime, etc. The ash is reduced to a minimum, and a high standard of purity is secured. A uniform and quick filter, retaining fine precipitates, adapted to the most precise requirements of analytical work. Cut in round filters, 100 filters in a package, five packages in a box of birch bark. Diameter mm..... 55 70 90 110 125 150 185 Ashes, gram...... 0.000060 0.00010 0.00017 0.00025 0.00033 0.00046 0.00070 Rerl00\ cece .20 27 42 55 63 85 1.25 213 Wiel Wh Ik H. TY He OF Me Ae ts GO Maes AS IN ea 27800. 27804. 27812. 27824. 27828. 27832. AS FWwWo T b> cr, — TRADE MARK. No 27788 Filter Paper, Munktell, No. 0. Same as above in sheets 480 x 480 mm. Perquire............... 2.50 Filter Paper, Munktell, No. 1F. The Original Swedish Paper. Of best linen material, by some claimed to be the most perfect filtering paper made; leaves one-third less ash than formerly, probably the smallest amount of any of unwashed paper. Cut in round filters, 100 filters in a package, five packages in a box of birch bark. Diameterimmerreeeees se. 55 70 90 110 125 150 185 Ashes, gram............ 0.00014 0.00023 0.00038 0.00056 0.00073 0.00105 0.00161 Per 100 <.e-fose eee Stle) a ag .25 .30 40 50 15 Filter Paper, Munktell, No. IF. Same as above in sheets 480 x 480 mm. Per quire............. 1.20 therefore more rapid in filtration. A superior paper for all laboratory work. Diameter mm............ oo 70 90 110 125 150 185 Ashes, gram..... 0.00018 0.00030 0.00051 0.00074 0.00095 0.00138 0.00209 40 53 No. 27820 No. 27848 Filter Paper, C. S. & S., No. 595. A good light paper, free of chlorine and tasteless, made of the best material. A filter of 15 em diameter filters 100 cubic em of water in 50 to 80 seconds. Diameter mm.............--. _55 70 90 110 125 150 185 240 270 320 385 er 100 aso eee ee 10 ao | 16 18 .20 Bry SY -65 85 1.05 1225 Filter Paper, C.S. & S., No.595. Same as above in sheets 470 x 540 mm. Per 100.............-- 2.20 Filter Paper, C. S. & S.. No. 597. A stouter paper than the foregoing, perfectly white and clean, filters very quickly (100 cubic em of water pass through a plain filter of 15 em diam. in 80 to 100 seconds). A standard paper for analytical purposes. Diameter mm........ Nee Cc ooe 55 70 90 110 125 _—:180 Per 100....... ae 15 16 .22 .28 -30 .38 Diameter mm.... ee oy eee. 85 240 270 320 385 500 Per 100...:5. Lf. dS el 48 15 1.00 1.20 155 2.60 Filter Paper. C. S. & S. No. 597. Same as above in sheets 580x580 mm. -Per100............ 4,20 Filter Paper, C. S. & S. No. 571, fat extracted for milk analysis. See M. A. Adams ‘“‘Analyst’”’ 1886, p. 46. Instrips 56x65 mm. Per 50 strips vod see dodgy eee Filter Paper, C. S. & S. No. 604, soft. This paper is similar to No. 597 but has the additional advantage of possessing rapid filtering in the highest degree. In all cases where quick working is desired this paper is most suitable, excepting where the precipitate to be filtered, is very fine and requires a closer and harder paper. Diameqm mies a eee 55 70 90 110 125 .150 185 240 270 320 385 500 ; Per00 2455. eck = b) 16 22 28 30 38 A8 75 «1.00 1.20 1.55 2.60 Filter Paper, C. S. &.S. No. 604, in sheets 580 x 580 mm. Per 100 sheets.................-.-+---- 4.20 te hie WU aR H. Th SHE JO% IME VA: C'S COR IME Age Ne aay eee 27840. 27852. 27856. 27860. 27864. 27868. 27872. 27876. 27880. 27884. 27888. 27892. Filter Paper, C. S.& S.No.575. Hardened filters, especially adapted for use with the filter pump as they cling closely to the sides of the funnel. These hardened filters will retain the finest pre- cipitates and resist pressures of 2 or 3 atmospheres when moist. Another important feature is durability in continued use, one sheet of this paper being available for several operations, as the precipitate can be scraped off without removing the fluff from the filter. They are probably the only papers which are suitable for the filtration of caustic liquids, requiring a long time to deposit, such as solutions of bichloride of tin (SnCl.), chloride of antimony (SbCl;) also acids and strong alkalies. Diameter mm................ _ 40 55 70 90 110 125 150 Per LOO Rea eee eA creed A2 02 56 82 1.00 1.10 1.30 Diameter muweyacitcc tee: see 185 240 270 320 385 500 ws, FO? UD: ccenenaesa Naan enon aa! ‘1.70 2.60 3.40 4.15 5.50 9.00 Filter Paper, C.S. & S. No. 588. Folded Filters. For general use. IDNEVRCIO? TAM, soooohakoesededsodosepeot 125 185 240 320 385 500 LEGS? TU oc cos. oe Ser aa een RP ae one ore ete 32 48 8 1.10 1.45 2.40 55 g 10 ASHES S OTAMi Lae e ce -00004 .00007 .00011 .00017 -00021 00025 : eral OOM epee eas siecle. 5 52 55 82 1.00 1.10 1.30 Filter Paper, C. S. & S. No. 589 “Blue Ribbon.’’ Washed in hydrochloric and hydrofluoric acid, and made from close, firm material. We recommend them to be used in connection with an air-pump or if possible as folded filters. They are suitable for the finest precipitations, which are not kept back by the black or white ribbon. Diametersmm= seas 55 70 90 110 125 150 INAV (AEN ogsodasneosee .00004 00007 00011 00017 00021 00025 » Berle aed) eee 52 5d -82 1.00 1.10 1.30 Filter Paper, C.S. & S., No. 589 ‘‘White Ribbon.’”’ Washed in hydrochloric and hydrofluoric acid. Suit- able for most analytical purposes. These filters filter quickly and retain a properly treated deposit of BaSO,. Diameter mmy-. os. ccs ae 55 70 90 110 125 150 AShes se ramen ns) ce cere .00004 00007 .00011 .00017 .00021 .00025 - Berk 00) sete ses ccs AAS -52 55 82 1.00 1.10 1.30 Filter Paper, C. S. & S., No. 589 “Yellow Ribbon.’’ Washed in hydrochloric and hydrofluoric acid. The filters of this brand are identical with the brand ‘white ribbon” but after being freed of mineral constituents, they are also treated with ether. Drameterimmes-eeeee eee 55 70 90 110 125 150 INES Pati coe auconuance .00004 .00007 00011 00017 00021 00025 RerLOO ins ee so ectieioters -65 -70 1.05 1.25 1.40 1.65 Filter Paper, C. S. & S., No. 590. These filters, which are also treated with HCI and HF! are thinner than the brands specified under No. 589. They therefore contain slightly less ash and filter and are slower than No. 589—white ribbon—but otherwise readily retain fine precipitates. = = on Diameters eee ee 55 7 2 150 ASHES Hy PTA eee tee .00002 .00003 -00005 . 00007 00009 00013 Per lOO cs sssseead cee 65 -70 1.05 1.25 1.40 1.65 Diam aNM eee eee 55 70 90 110 125 150 185 240 270 320 385 500 PerlOO meres ens oe, OS Oo 2 2 SS ge 1 WS We PEW Be Filter Paper, C.S. & S. No. 602, hard or extra hard, in sheets 580 x 580mm. Perl00.................. 4.20 Filter Paper, C. S. & S. No. 591, an extra heavy and strong paper, specially adapted for the filtration of liquors, fruit juices, syrups and oils, and does not give off any hairs or fuzz to the filtrate. In Sheets ISO Kos O MMT came Orsl Cee esc sessiese so. s) siniiaysvoseierevele ap araiPepersvescuevetePanets ele tev ome) ovatens jerienel tote deee Ieee 5.80 Filter Paper. C. S. & S. No. 551, a deep black filtering paper, specially adapted for filtering light col- ored sediments and for drop reactions of the same nature. These papers are not acted upon by water, alcohol, ether diluted acids or alkalies. Diane amt eeeae seein 55 70 90 110 125 150 185 RerlO0M ees eee ree 22 -26 34 42 44 55 .70 Filter Paped, C. S. & S. No. 601, for drop reactions. In sheets 140x 220mm. Per 100........... 2.35 Filters, Folded C. S. & S. No. 580, with parchmentized points to prevent breaking under pressure. Spe- cially recommended for the filtration of molasses, fruit juices, liquors and caustic solutions. DTA THES M nee toe sacrs Ge dith one gates ayeee atectaerne aie 320 385 500 Ory LOO Metron reso cites eae ean oe ke bP Stari Mid Bis 6) Sate DaLe cb ARC eam eye 1.40 1.75 2.70 Filter Cones, C. S. & S. No. 574, consisting of semi-circular discs of No. 575 hardened filter paper, for folding. An excellent substitute for platinum cones. Diameamnmes snes: 55 70 90 110 125 150 185 240 Persl00y ey one AGan = nn co 76 85 1.00 1.30 2.00 ww ou APIER 7 Nalysen a 9 Ae ms 7 ket a ay No. 27900 No. 27908 No. 27952 27896. ‘Filter Paper, Dreverhoff, No. 86, crimped fast filters, heavy, dense and pure white. These papers filter more rapidly than any other, the filtering surface being increased 60% by the crimping. Spec- ially adapted for sugar work and for filtration in silica determinations. Dramamine eee oe eee Se. 55 70 90 110 125 150 185 Per 100. PS met re acpe ofeis, ofala seyeneis -14 -20 -26 29 33 37 50 IDEN Tila: Taahad en ees neice amelie co Socio tha 200 240 320 380 450 __ 500 IPO re OO Weer cree arcisteler siete eee os orerd ceecenc re oars -64 S81 1.31 1.83 2.51 2.84 27900. ‘Filter Paper, Dreverhoff, No. 207, rapid filtering, ah ashed with hydrochloric acid. DiamesommMee seein. 90 110 125 150 Ash per filter, grams.. 0. 00016 0. 0003 0.0005 0.0009 0.001 0.0016 ersl00 Meron tee: .22 Pf et wo ae .82 27904. Filter Paper, Dreverhoff, No. 400, washed with hydrochloric and hydrofluoric acids; of very close tex- ture, retaining the finest Brecipita he Although very strong, it filters rapidly. 70 90 110 Diam., TOMS See eer 125 150 Ash per filter, grams. _0. 00003 3 0.00006 0.00009 0.00014 0.00018 ——_—-0.00028 lets (i eeuasaAgeeenade bz, .78 1.09 1.50 1.68 a ee 27908. ‘Filter Paper, Dreverhoff, No. 417, w ‘ashed twice with hydrochloric and hydrofluoric acids; retains fine precipitates such as barium sulphate, etc. IDTEN es iGeccapooder 70 90 110 125 150 Ash per filter, grams. | - 0.00002 0.0004 0.00006 0.00009 — 0.00012 —_—-0.00019 Per 100.. stays .67 -95 1.34 BITS 1.96 2128 27912. Filter Paper, ree erhoff, ‘No. 206, a superior white paper for general qualitative and pharmaceutical work, retaining fine precipitates. IDicvaihs Screech Soa a oneoS 55 70 90 110 125 150 185 240 320 400 500 Per 100 Lele aioe tetcaieteterassistdvciotayerare 13 15 -20 23 4 30 = .38 58 1.02 1:91 248 27916. Filter Paper, Dreverhoff, No. 206, in sheets 450 x 450mm. Per quire...............0.-00eeeeeeeeeeeee -56 27920. Filter Paper For Agar, A. H. T. Co. Special, sometimes designated as ‘‘ Lautenschlaeger’’ filter paper. A heavy, white paper with rough surface. Specially recommended for filtering agar and other culture’media.) In’ sheets /400 x:400 mm. Per 100). 955.....Jo06 oes se eee eee eee eee 2.50 27924. Filter Paper, white, so called ‘‘bibulous’”’ paper....................- Per ream 3.00 Per quire .20 27928. Filter Paper, Chardin, as used and specially recommended for filtering agar agar in preparation of culture media. The filters are already folded and come in boxes containing 50 of the 32 cm size and 25 of the 50 em size. Diametersacmencate se eee eevee cre « nivhiber cinvlen si datieat eee tees Rae, 32 50 Per box.. Hoos. bo onk hd COTE eee COMER EAS EEN jactonte home ade iS, ets ROO 70 27932. Filter Paper, Chardiny i in faneeeas o8 cmisquare. ‘Per)25:sheets. 220. 2.2: 2 - eee eee 1.50 27936. Filter Paper, Prat-Dumas, white, in sheets, 17 x 21 inches. Per quire............................ -20 Per ream. : aes . 3.50 27944. ‘Filter Paper, Dialyzing, Morochowetz, C.S. &S., a specially cut and Felded! SET DEE of a rieg bansin! paper. They are folded ready for use in funnels from 12° to 15° angle and 250 mm high. No. 521 is thick and No. 522 thin. Sn Cats foyer Wb 0 Of) ceeeeanrne Pier stat nc ee Ae Totten ho icdaao sxc 521 522 Benpackaveciose Seite sis laeyo ata Meee or Ao oass s , cark 2.00 Note—For Funnel for use ‘with above Dialyzing Filters, see No. 28582. 27948. Filter Racks, for holding the filter paper away from the sides of the funnel; made of galvanized iron wire and rubber ring. May be folded to serve as squeezer. Diameterin CHES! es sete hose eres Toho ele eine Rio 5 (hE 9 12 LE Rareate Gree testemtnrtts Moatinies Ounce OF Rar OoR AOU RCE ns o 30 40 -50 75 27952. Filter Paper Box, of japanned tin, holding five sizes of circular filters from 3 to 73 inches in diameter. Very convenient in the laboratory as it provides ready access to clean filters at all times...... 2.50 216 27960. 27964. 27968. No. 27972 27972. 27976. 27980. 27984. 27988. 27992. 27996. 28000. 28004. 28008. 28012. Filter Press, Laboratory, complete with pressure pump, three filter frames of different thickness and three sets of filter cloths. Exposed filtering surface is400 sq. em. Pressis of ironon heavy iron base. DutyeWree se cone ee sccenes 45.00 Duty Paids:- pepe ee ase 60.00 Filter Press, Laboratory, as above but of bronze DutygP reer san eee oe eee 60.00 Duty Paide toe ie ee 80.00 Filter Press, Laboratory, with two pumps, one for pumping the material for filtration into the press, the other to pump in the bleaching solution. Complete with three filter frames and three sets of filter cloths. With an exposed filtering area of 400 sq. cm. IDI eOsasoos dogoe oe cae enpHe 60.00 Duty Paid.. We Bee es saps 80200 Filter Press, Laboratory, with press and Pump A of bronze and Pump B of iron. Duty Free ee 0-00 Duty Paid... .. 120.00 ! PRESSURE J Voiscuarce. No. 27984 No. 27988 No. 27992 No. 27996 No. 28000 No. 27976 No. 28004 No. 28008 Filter Pump, Chapman. of polished brass. For operation under ordinary water pressure either on faucet or directly connected to water supply pipe. Length, inches. 33 43 : abt EW iL gs osdcecpoo gape coudcHts Den OAGTAE OGenR ean Rarer nee ne ane 1.35 1.75 2.00 Filter Fume Couplings, of brass, with faucet thread. Style and size of filter pump must be given when conde obit iocoom nd oe OOO Cane GdO00 Go BODOG DOD OU emOneGantaorac OboroU cbocso nono co oon odaossnnnos 5 3 Filter Pump Couplings, of brass. for connecting with faucet without threads. Style and size of filter pump must be given in ordering........... 5 Filter Pump, of brass. New patent form. More efficient than the C ‘hapman. eng Uh Sin chest mrt cmctactae ce chee thet shoe cone nats see eee 33 43 5} LEO Use Saige bbe p Oe ea ENC Clee 9 5 ne ene 1.35 1.75 2.00 Filter Pump, Geissler, of glass. . ee Ea ae ene Serie aero cas i si ba. ctr i emer -80 G2 be Muencke, of lass, With one suction tube PO eR ey cn ral 8 6 con a ee 1.25 a camer bwiOl. © °° Bota a5 DME aa Ee Sesame) Filter Pump, Richards, of brass. A very powerful pump. Meng th inchestanccscses ene eck cease ose ai u 13 Size pipe fitting thread, inches.................. $ 3 3 DEG! No Sicno tthe cid oC CECT EEER Gc a 1.25 2.00 7.50 Filter Pump, On Base, with stopcocks for water and air connections........................-05- 10.00 Filter Pump, Water Jet Form, displacing 3 cu. ft. of air per minute with 20 lbs. water pressure. Will ex- haust a 1 gallon vessel to a vacuum of 293 inches of mercury in 10 min. with a 10 lbs. water pres- sure and in 5 min. with a 20 lbs. water pressure. Very useful for filtrations, percolations and distillations in laboratory work. Complete with vacuum gauge, connecting tee and two stop- (COG es oShet Ge ROB DOT OOD Oe Oo IEEE om cin niaain on toeitaO.2 oc we Fao Ee ee ere REO 12.00 Filter Pump, as above but for operating by steam instead of water, with steam connections.... 12.00 217 > 7 tar ab (Ss eo) reo =] oo ° = > w o) O° < uU > Zz ~< ( \ No. 28056. No. 28060 No. No. No. | = = 28028 28032 28036 No. 28044 No. 28048 No. 28052 \ No. 28016 No. 28020 No. 28064 No. 28040 No. 28068 No. 28072 No. 28076 No. 28080 28016. Filter Pump, for both suction and pressure; with metal reservoir. Filter pump is removable. Bon cocks and fittings are nickel plated and reservoir is of zinc finished in bronze lacquer. . 8.00 28020: ‘Filter Pump; as'aboves withimanometer...........s+.+s- secs ssencce cee cee cee eee nee EeeEe 15.00 28024. Metal Band for either of above, with holes to conveniently screw to wall.................. -50 28028. Filter Tubes, for fvcring bhroweh @ asbestos, glass wool or glass powder. Length, mm. BP TOT ics bebvere ¢ GS dias INS Le sia Ses ae etre COE CeCe 150 __ 200 LOL) | Bamlags cma de otic GO NGS aaa eE en EneEeatonudocanen aa doogednanaoeoolous -10 as 28032. Filter Tube, Fresenius, with bulb, 20 mm inside diameter at top..................200-2002eeeeee -20 28036. Filter Tubes, for use with Gooch, Alundum and similar crucibles. Tube of 32 mm inside diameter is suitable for Gooch crucible No. 25294, 25 ce or Alundum crucible No. 25266, 25 ec. Rubber tubing suitable for making alreighe connection with Gooch crucible is listed under No. 46236. Inside diameter at top, mm. 18 20... 8 2 28) 2 Sie 40 Bach stor. 5 pee 18 20 22 EDS 30 ec mend0 28040. Flask, Acetylization, with ground in condensing tube, as used in determining menthol in oil of pepper- IMAG OL CE sacs ctess crevevere cia. ois evsieyete a6, ofoyere-svavaiera wastes /e. 4:6 avavayars) Smee Mele oe Takeo eee ae . 28044. ‘Flasks, Assay, Best Bohemian Glass. Capacity, cc...............-.. : san. OO) 100 250 LOE) hae eiene its A apie Ae eetn Sictok i cera mets GR eaeIAIN MURORIGEOCENS Ginn nic ns -18 -20 28048. Flasks, Assay, Best Bohemian Glass, conical high form, with narrow mouth and spout. Papacity,, CC he scmses yee cee women cle a. s ¢ areas Scisieisman oteteenteteinere nase 50 100 250-500 Ba chits,. merepectaeretictins at ine Pasi xan coer nie asd aye, eRe octets 15 20 25 -30 28052. Flasks, Assay, Best Bohemian Glass, conical wide form, with spout. Gapacitiy Nee essere ces veveterea ocle sve revs a this as anes ree eee tS oer 50.100 250-500 DOE Witcagine icc patna nce aliac tee Amen Tne e Orns anomeriacs: 15 20 25 30: 28056. Flasks, Assay, Best Bohemian Glass, pear shape, with long neck. Capacityer Cesc acne Gacoiereaie sinesice asa ie eek Gatti pee See enT See eee 50 100 250 OEY) (Harel ao.c. te bon OSC C OKIE iE aOe ARE Ear anicicccdascuanace 12 555 as 28060. Flasks, Best Bohemian Glass; light weight, low form, with extra wide mouth and flat bottom, so- called Carbonic Acid flasks. Capacity,cc...............- _ 2 50 100 150 250! 1 DET | BaRRRRE Berrie SUS Cacia oD ORO aEne GoM O ROR EE eT EA noon Han -10 12 15 -20 -2> 28064. Flask, for Copper Determinations, with flaring neck. Capacity, cc. Sapdoedccoors 2 IN) atl BAA CHa ss eset a decree atsco te aie ROTA eae vay av ica Uo Siete SUIS a AOL 1ST ete tal CTO Ta 20 -25 28068. Flasks, Joliet, much heavier than boiling flasks but made to stand heat; as used in iron and steel analyses:0 (Capacity: Cezanne arth oie io ots occ ts esses eleiee ete ere eee 50 1000 2000 LOL) | Wasa D Se me eRnen ah ach ondn ce Cn a COR Oe em rrersoraiacce > -Baasoe6 25 -35 -60: 28072. Flasks, Johnson, for Sulphur Determination, for use in iron and steel analysis. With heavy ring nets taking a No. 6 rubber stopper, capacity 275 cc to base of neck; height 1651 mm 28076. Flasks, Low, for Copper Determination; cylindrical neck with flaring top. CAPACiby = (CO j2c5::ele neue ene cheese eee Oe este eae repetalos Jo) }oiesle o ais aKansranile teste eee Ea 125 250 Bach) Sereda hac « 2/ctar oS eA SER SE EC io eRe ees Cie ei 28080. Flasks, Soil Analysis, of Jena Glass, with long condenser tube ground in with air tight joint. Capacity) Cec s oy.jcsesaisccicgonereuehoere ee ete elener stots ets eteze sae se ersie Aus sticks Sia ee ae eee 200 — 500 Bea hee isc eects stay ciara ese hnvs wie) ate te gate Hepes ish MOO ae oleh erelave Siero oeke clea faye Rieter 1.60 2.00 218 28084. 28088. 28092. 28096. 28100. 28104. 28108. HEAVY GLASS FOR WASH BOTTLES No. 28084 No. 28088 No. 25092 No. 28096 No. 28104 Flasks, Best Bohemian Glass, flat bottom, vial mouth, with uniform necks. @apacityacehaasa. te eee ek aes 25 50 100 150 200 250 300 400° 500 750 To take stopper No.......... soemee 0 1 2 3 Cee eee By 5 6 Rachinee eo ccte Recess. 200) 08) AU a eC Se ee 0s g 225 @aaethvarcets. seer stance ... 1000 1500 2000 3000 4000 6000 8000 12000 20000 Mottakelstopper NO:.7.2025. = 4-ctaeee EG (OD AO 13 1705) ae Ane eee SRR I 30. 35 45 .60 .80 1.00 1.50 2.00 3.50 Flasks, Best Bohemian Glass, flat bottom with heavy ring neck. @anacity. jC sa ee Hae ae eee ea istienens 29 50!>) 100 15020 250 300 400 Moytakeistopper Now -neecne ace asec a eee = 0 1 2 3 3 4 4 5 Each. cog auddisboes se coe cade opemsocassedcoceDE -07 -08 -10 12 14 -16 17 18 Gaamciiny Mec he oy ee nena ery 500 750 1000 1500 2000 3000 4000 SROMGAKEISLOPDELIN Oras sc ch ecient tee meses Soa sae 5 6 6 7 9 10 10 1 DENG 1 Seon See co AES ONS Coico nce eect eee -20 20 30 30 A5 -60 -80 Flasks, Best Bohemian Glass, round bottom, with vial mouth. Wapacitycencesscee teas: setae eee 50 100 250 500 750 1000 1500 2000 4000 MovtakestopperiN o:se.cee see sacihnew cee: 1 2 4 Sa 6 7 9-10 Bachieye ny hs: fee oh sehen oesae ates ale s'5 2 -08 -10 -16 -20 20 .30 3D 45 -80 Flasks, Whitall Tatum ‘“Nonsol” Glass, flat bottom, with vial mouth. Very insoluble in water, alkalis and acids and specially recommended for uniformity of shape. By special arrangement with the manufacturer we are enabled to offer these Flasks for immediate shipment from our own stock at original net factory prices. @apacibysceeaneorecoeatee beets asine ee 60 120 180 250 500 1000 2000 Moiiake stopperiNOs.s-senenee Henson ih 2 2 a ae aS Ors SAS. DEV hap aoenoetonueae tases sce x aieeeemeneete aul ae aE! 15 20 .28 45 Flasks, Whitall Tatum Regular Glass, flat bottom, vial mouth, widely used in industrial laboratories because of their uniform shape which is identical with the illustration of ‘“Nonsol.”” By special arrangement with the manufacturers we are enabled to offer these Flasks for immediate ship- ment from our stock at original net factory prices. Capacity, cc..... 30 60 120 180 250 500 1000 2000 4000 s000 12000 Bach). 26; cis 0 Us dy a Sie ay 15 23 35 75 1.25 2.00 Flasks, Wash Bottle, with stout ring neck to withstand corking. The heavy wall of these flasks makes them much more durable under mechanical stress than the ordinary boiling flask. (CAYDETO tingn (Cloyh ne dace de NN DOGas Dr COR aa aE neetidee eerereret 250 500 1000 2000 Mostake stoppers NO seen mercer teins. accuse cls 2 seo 3 5 6 ip MAG Hes cectaranieleisverctaee. mee situate ted voroteratcyaveversytavessrcesce ets cvowelene siesta ol 5) 20 35) 50 Flasks, Opaque Fused Silica. These flasks are sufficiently transparent to enable the level of a liquid to be determined. They are furnished with either round or flat bottom and are admirably adapted for direct heating by electric resistance wires for boiling at high temperatures, etc. @apacitiyanc cise -7-y-er 50 100 150 200 250 _ 500 1000 ache eee e-em 2.75 4.00 4.25 5.00 6.25 7.50 16.00 Flasks, New Jena Glass, round bottom, with vial mouth. See illustration on following page. (Chin CUny, Clccccatmactoesconcd to SARS BEE OSOODIe cote 50 100 150 200 300 400 Mostakeistopper NOs. -..94scmemee cies © --- Se agi! 31 3. eee 5 LOETH Eo goe don dc ReGen ao cHoonn coo sc eRacenCrTaroenac ll AZ -14 -16 19 23 CIDE Aco sacnpadn coon oooporn mo obeat Ee UDBOODOODC 500 700 1000 1500 2000 3000 MowtakelstoppenuNOnsscmertirsrere lls etl eta siete ietate tore so8 6 (en id DEG thn GeassoongensabocrncogtacesssEemeeade 26 32 38 45 53 -68 28116. 28120. 28124. 28128. 28140. 28144. 28148. 28152. 28156. No. 28112 No. 28116 No. 28120 No. 28124 Flasks, New Jena Glass, flat bottom with vial mouth. Capacibyy cca eter cei as oe eee «lic era a ea ee eae 50 100 150 200 300 400 Roghakelstopper i NOsseeeeecos ono ec cieeeeeeee 0 0 1 2 “43 med, achive coe co NR e ee eases ci he aR +e ll 12 14 -16 19 23 @apacitye cess rocieis sect vie Gin sehe siete ees Riese 500 700 1000 1500 2000 3000 To take stopper No..... Sy Sees 2h S Been arses cee 6 6 7 rf See JOE Wes sn necamaae coc soon SHOOe ERC onenececasusene: 26 SY 38 45 53 68 Flasks, New Jena Glass, flat bottom, with heavy ring neck. Capacity ACeh ene ee ee ears eos Oe ee aE ee ee ae 500 1000 2000 MotakeistoppecswNowme waives acesise see. See teen Goer etl, Peat 6 ie 8 Boa Cha a cssvse parsers ere esis yore es oles oa aiacdis fs RIN e ole Oa ee ee ee 32 46 63 Flasks, New Jena Glass, round bottom, with short ring neck. Ga pacity, «COM eee obvi Gas cericck 50. 100 «6150 6200) §6©3800)69—400)3=63500)3=—700-=S—1000 ‘Toytakeistopper NOtesese=:..o-.0+ ss eo. 0 2 3 ios cee ee 6 u Each.. she ees eer as Ee le -14 -16 19 -23 -28 32 38 46 Cap acity, » ec. RS oi Atick MAG AaE 1500 2000 3000 4000 5000 6000 8000 10000 To take stopper SN Geseeee era at ee 9 9 10 10 11 uh 1 12 Bach secre eee eee aes 55) 16392801)" 29379 Ob Or 00 Flasks, New Jena Glass, round bottom ih I long ring neck. Prices and sizes same as for No. 28124. -\ No. 28152 No. 28156 No. 28140 No. 28144 Flasks, for Iodine Determinations; with wide, flaring funnel shaped lip and hollow, ground in stopper fitted to neck. Capacity, COs sare 4 See Cee ss eee tne Ses Se oae ns aon ee eee waz 250 500 LOE YG PONS pea ieiee REC os Serna 6 OBR Mee RN SORE ae 5 rs 60 75 ~~ 1.00 Flasks, Copper Oxide, for storing CuO in organic analyses. Capacity, iG crs concent sos ce ee Ee eee eras ae een eee 125 250 500 LOE (Wes ae 6 Aree RR Ee sein so cHo Nea c OCR C Eee Oe ee ER Obcbe sSoabe eae 55 65 85 Flasks, Copper, polished, with ring neck. Capaerby, iOC< as sacrise Sais en ao oie Shee 250 500 1000-2000 BAGH Sia ects sot nhc sie eee SI ee ies fects ae 1.75 2.00 2.50 3.00 Flasks, Copper, polished, as used for Kjeldahl determinations; 4 inches high, $} inches diameter, capac- Eby LODO COS cc ie erate win fara. te eiees ree ere leno. atclong SIRO BU eee 3.30 Flask, Orlovius, for the sterile drawing and handling of lena for ayy peteninlner al purposes, fitted with a ground in glass stopper with two tubulations and a protecting cap... 4...-5--0 eee BES» ANT Se CO, ewe EXTRA WIDE MOUTH WIDE MOUTH No. 28164 No. 28168 —————————E an No. 28160 No. 28188 No. 28172 No. 28176 No. 28184 28160. Flasks, Erlenmeyer, Best Bohemian Glass, with narrow mouth. (CEHROUNE Con aosenettocednsd Bye eed, PRED: 50 100 150 200 250 300 400 500 750 MowtakelstoppenwNO ees ace. sees see 0 1 2 3 3 4 4 Ole enone 20 1 DENG Seago a eeOO td oor Een oticos mane Oh, -08 10 12 14 16 #3 U7) 18 -20 -25 Capacity MC CUR ee ne ee ee be kate Sea. een Rice ae 1000 »=©=6 1500 ~=— 2000 »=) 3000 =~ 4000 Mowiakeystoppen NOs nace Aone cciene ooo arse nbioere 6 7 a 9 9 JOEVG lio pRB eae Gdd SOOM ec ae ue CEUs ae cod Comm EE eee moan © 30 si A5 .60 .80 28164. Flasks, Erlenmeyer, Best Bohemian Glass, with wide mouth. Gapacity cet sacenie seus cisenils 25 50 100 150 200 250 300 400 Toktakelstopper NOs... ...<. se Pe tall 2 3 1 4 5 5 6 Bachinerncooscacte che deeakeease On 08 10 12 14 16 17 18 CapaertycCism-teee cc ceremeetoeeeeaa ae O00 750 1000 1500 2000 3000 4000 Montakerstopper NOscee. esis ooeee rs 6 i 7 8 9 11 12 Hachiepr er ee comma cclcih enacts 20 25 30 it 45 -60 .80 28168. Flasks, Erlenmeyer, Best Bohemian Glass, with extra wide mouth. (CH OR OIAYE (COs en Bacto Seer Gnnd ae co mere SoLLIG cere eo rnenE Keane sonar 100 250 500 1000 DES ges ndrougs doqbundoacn obo ra TatD Osa are mer oRaT eo SBeRAGoOsd oro -10 -16 20 -30 28172. Flasks, Erlenmeyer, New Jena Glass. WapachtypeC Chance tey ersarrcte sor teievs: : seae. 2A 50 100 150 200 250 300 500 somrakeys topper Notre ances nec. /iccxsvess 10, 2 susreleteie 00 1 3 4 5 5 6 6 JORG dena SinGediic DASOReIO CEng aEae a eR eae 09 -10 ll oll 13 5 17 24 Gaacityevec rane cwsvey ty a tset eye te ost Vantaa case 600 750 1000 1500 2000 3000 4000 5000 Montake stopper: NOV eins esiecitors osieeeeciacdascls one Gow 8’ 10-10 10 10 LEY Ungtous aoe pin ato REINO OO IOC Ra eC ron emten PAR ERA BY ES EL) 28176. Flasks, Erlenmeyer, Whitall Tatum Nonsol Glass. Very insoluble in water, alkalis and acids, and specially recommended for uniformity of shape. By special arrangement with the manu- facturers we are enabled to offer these flasks for immediate shipment from our stock at original net factory prices. WandcityareGdoc: atenas cee eae e: Soa seo 60 120 180 250 500 1000 2000 Mowtakelstoppers NO: cegec cose c cele oe ] 6 On ees Aton 5 eG 8 LEY 0, 2 chen gOS Se ODEO CCRC OO OMICS out 13 14 15 20 30 50 28180. Flasks, Erlenmeyer, Whitall Tatum Regular Glass, widely used in industrial laboratories because of their uniform shape, which is exactly similar to the Nonsol above listed. By special arrange- ment with the manufacturers we are enabled to offer these flasks for immediate shipment from our stock at original net factory prices. @apacitivccs-eev-eeer ce __ 60 _ 120 80) 250 350 500 700 1000. 2000 LEY OB SCN eR aC ee anne -09 10 Sulit 12 14 cn .20 .23 38 28184. Flasks, Erlenmeyer, Best Bohemian Glass, with ground in glass stopper. (CEO ecenec con GODEGE DOSE aot o 010 Reo eas opener mma deca 125 250 500 1000 LOE) Us Sosoanboncenicc Get Op anOebe tao Dae Con REET onn oR aoc oe are 50 -65 85 1.25 28188. Flasks, Erlenmeyer, with very flat, extra wide base, specially constructed for boiling on electric hot plates and for culture flasks. CORT OO RIN MAIO? SAORI AD occa Seite an ean ae See ae ROS Iona riser tee 250 500 1000 DEW Weeoactodopuctn acct atGoco CREO cn nati mime Arora conse cicbolacaee 18 24 45 221 No. 28228 28192. 28196. 28200. 28204. 28236. 28240. No 28214 No. 28200 No. 28208 No. 28215 No. 28216 No. 28220 No. 28232 No. 28224 Flasks, Distillation, Best Bohemian Glass, with side tube high on neck. Capacity ccs. eee eee nee 30 60 100-280 500-1000 ——-2000 Bachyng fe cee ccc SOME ee Tae “15 -20 25 .30 50 65 1.00 Flasks, Distillation, Best Bohemian Glass, with side tube at center of neck. Capacity ccna eee eee erin: 30 60 100 250 . 500 1000 2000 Bach ieee sheen eee eee eck “15 20 25 .30 50 65 1.00 Flasks, Distillation, Best Bohemian Glass, with side tube low on neck. Capacity ices: aeeeeeo eee 30 60 100 250 500 1000-2000 Hache. te snooty ee ee eee 15 -20 25 .30 50 665.) 1:00 Flasks, Distillation, Best Bohemian Glass, with side tube 400 mm cae at center of neck. Capacity; (ec oncc.sy1msa eee eee eee hie ce een 100 250, 500 1000 1 OE | Bribie SORTS AOE S no cae CURIE aDrrncinn don acotts -30 40 -60 ib Flasks, Distillation, New Jena Glass, with side tube at center of neck. Capacity .cetnastcaddels oc cc pene. 50 100 200 300 500 1000 1500 2000 3000 Baht sca ooticiee iets ao REEL Bes 22 24 29 34 45 65 78 1.00 1.25 Flask, Distillation, Best Bohemian Glass, with side tube bent down at right angle. So-called ‘“‘sul- pbur’’ flask. Capacity S00:CO ois cece ois ocreie ve cisswisse ani vidas degre raeis ain oere ee ne -60 Flask, Glass, for use with the official Brown-Duvel Moisture Tester. See Bulletin 56 of the U.S. Bureau of Plant Industry... o.seeseseecs om oe he pe cna wala de cso ele Oe eee eee eee eee vio Flask, Copper, Double Wall, for use with the official Brown- Duvel Moisture Tester when same is used for moisture determinations in flour and ground grain substances in which the copper flask is used in place of the glass flask. See Bulletin 56 of the U. S. Bureau of Plant Industry...... 5.00 Flask, Distillation, Ladenburg, with three bulbs in neck. Capacity 500 cc................+.2-00205 -80 Flask, Distillation, Hempel, as used in the U. S. Department of Agriculture, Forest Service, for the dis- tillation of creosote: ‘Capacity 500. cent) .....5-.05... 02+ wes cee eee eee eee eee eee -80 Flasks, Distillation, Lunge, with trap in neck. Capacity, ce. Ponoaosagocos 2s) 250 500 BRO Re Spsie ccs Kos, ts dt shieletivtesg Sete OT ee erie Se eae een eee -60 -70 -90 Flasks, Distillation, Claisen. Capacity, cc.............--..+----+-+e+- 50-100 250 500 LOT (doom Oe ane n oan aaa nano ces at auc Sud doko ate: adobe Cao 50 -60 75 1.00 Flasks, Distillation, Engler, as used in the coal tar industry. Made to exact dimensions. Capacity 0G ssc joscwsicactescct vince te Orn Cee on ach os ete ee _ 100 250 1D AAS Pca One ae eA eI Mer rock Oo ean de oe ROM Roane oadad ats ooonce -30 40 Flask, Distilling, Engler, Semi-transparent Silica, for use in distillation above 300° C............ 5.00 Flask, Opaque Fused Silica, with side arm for distillations. Capacitiyaccteeassmacene one 50 100 150 = 200 250 500 1000 Bia chy. cre swicrctaretersle atecrete scsi 3125 nT 5.00 6.00 7.50 9.00 18.50 Agee. tie Hi Sai» UR Jale lie Ei Ore (Mey Aye 'S CHO Min Eee a Nie ey: ae \ Aw.T.co 3 No. 28244 No. 28248 No. 28256 28244. ‘Flasks, Filtering, Erlenmeyer shape, of heavy glass to withstand pressure. (CEO Uia (Caron maa a ena ton ae Rein irra eran inion cena cescon oor 250 500 1000 2000 Each RnB DDO OLodAdOO OS Oe mee. code Rao se AHN OcO Qe Y Pon noOrdanomnasic 20 40 -60 75 28248. Flasks, Filtering, same as No. 28244 but with side neck. AC AMACIUV ARCO Hace tic tn eee ence ire te eee 250-500 750 1000-2000 =~ 4000 Each. sai ielsiejejoie io einta/wickeiess\s S¥eisisieieisiet == MO ene 35 45 50 -60 1.00 1.50 28252. Flasks, Filtering, same as No. 28248 but with side neck and glass stopcock. (CA ENSURE aR aes anni d BR SSE Eason Da EES Onno aon GosodtOn ere anornooaat 250-500 1000 ESRC Doras rasa s fa es a cetera tae ae ols Fae ee ores a sar Si en alsa veta ela la, aie erelsfoie articiapti iors ae ela 1.25 1.50 2.50 28256. Flasks, Filtering, Erlenmeyer shape, of heavy glass, with side neck and tubulation at bottom at opposite side to take ordinary stopper. CEIDEON CPsoncnoapoeccogd sods noose counbopoDOECgsoonnacbeosapeseoocnaS 500-1000 ~——.2000 WEG coos peg ncgnonoosacecgdoonceanonoddo sos oaGsn gua cepeacoBOSDRCORONaT -90 1.20 2.00 28260. Flasks, Filtering, Erlenmeyer shape, of heavy glass, with side tube at neck and in addition tubula- tion with stopcock on opposite side near bottom. Capacity 1000 cc..............---.--0-- 2.00 No. 28264 No. 28268 No. 28272 No. 28276 28264. Flask, Filtering, as above, but with ground in stopcock in lower tubulation. (CHCA Coboonoseuuee cAcdusosnsneuaseosonoadc doooudecoouossckondoS 500 1000 2000 LYN. cA sB el ben aa Cntime eo ace gea tne ene ence nResn arorcnrrnn eae 1.50 2.00 2.50 28268. Flasks, Filtering, Erlenmeyer shape, of heavy glass, with side tube and with funnel ground into neck. (Cynon Ce gacdapgeunsedtoosaasunes seppooooudeDOG0o Geooca sapHooeDGoUosedsds= 500 1000 TSHya ng 2 ae ee es ota See eel Seer aren ieee tate aes Ceo cee ON 2.00 2275 28272. Flask, filtering, with side tubulation and funnel shaped neck into which the filtering funnel may be tightly fitted by means of a heavy rubber ring. Price does not include glass funnel or rubber ring. CHRO MIE ChodticsboadsceOgesonaDeEetES Toner spoesicecanncens a wlll 1000-2000 JOEY TEs Saab On bobo tb ESL oned Gone mT ODAans Soper CODDEan nop ocUroC -60 1.00 1.50 TEGTS, TRAITOR EATER Grdna Mea > CTO AL No. 28464 No. 28468 No. 28472 No. 28476 No. 28 . 2848 No. 28488 No. 28496 No. 28500 No. 28492 Flask Heater, heated by electric incandescent lamp, for conducting ether and similar distillations with- out danger. On support, with connecting cord but without flask. Will accommodate a 1000 Cp a Se cs SAE. OOP er cens inne, AERO TREES SUBS oor cnt ne UD MES cu tee ee 4.00 Flask Heater, Electric, of copper, with convenient ring top. Diameter 83 inches, height 4 inches. Furnished with three heats, regulating switch, 6 ft. of cord and switch for connecting. Requires 500 watts. Works equally well on direct or alternating current but voltage must “be specified AMWOLCEKIN Peer ee Aor ache e eie bie idee So cloe G Mines ese al Ae Io nT cee oe ae: . 12.00 Flask Heaters, of sheet iron, with ventilating openings and asbestos inset. iD, Ta Soke SEN Re gen Be oe Eee ee 110 130 180 220 270 LEYS We ae nC Or actin ted doo TOO CaCee ECE ice ei oncr tics -60 MD -90 1.10 1.25 Forceps, of br: ass, SUA heres ate teresa ravceahite cars Stays cia aicictorstercrare ci comaratater meteors SRE A Sere . ld OYA NTs SOREN SOO DRC. Se RETO a ment rictincs EakracSeone AE oot eee Ls ss SER ee AWA GIN TV OL Ya. GUPS sre ctavere fac average w visi yaxs apays avoxs wists eronedoate siamese Oradea ps See certs -70 a «_ « ~~nickel plated, so-called Goosenecks. Will not corrode; 1 150 mm long. 5 Bese aoe cau sé GAG TORI, Vbe ia ieee rep esgogecdoors se oaane 100 112 125 150 DENG (ia Soar ES BOS aoe ESOS nam arora snap Wayoraytharctaerexs -10 12 15 -20 Forceps, Blowpiping. French form, 5} inches long, with heavy platinum TID Saee erties ce ctee 5.00 Forceps, Binnitigeneelanistyl event er icnccisc eohis Ae Oe Soe nee eee eee neae . Ah « 119 Es RP ae Sate oldie, bios a ene ROR MEN CA EEE GG 5a aan fn saa cameo 1.75 Forceps, of steel nickel plated: For removing specimens from deep jars or bottles. iLesniyarloie Wiel oop aoe A OBA RDGAS © Soe Dab ara eto ; 250 300 375 450 LEA Toa aR acthicce Soe Sere api Biche eine AREER eae EaIeRSE Nom CSerC Sra gy les 1.50 2.00 2.50 Forceps, Cover Glassswithehateibentipladess 05 mmloviges sees eee eee renee eee a0. coil) ee with thin, straight blades and guide pin, 115 mm long Searcy a ocean sien -50 e oe ¢ with thin, bent, flat blades; self-closing; 125 mm long. ee A Shotts ede 75 2: ss og Ehrlich, with long, flat blades and locking device; 135 mm long...........- 1.25 Forceps, Cover Glass, Novy, with flat lower blade and curved, pointed upper blade. Nickel plated. i\Geserrenva Pore veaae ase) hie eee ese eee ee rena: on ctor 55 Behe te ee eee F -50 997 ANT co ain lll ill iil Hy No. 28560 No. 28544 No. 28548 No. 28564 No. 28568 28516. Forceps, Cover Glass, Novy, same as No. 28512 but with locking device....................-..- 28520. Cornet, of spring brass, nickel plated, self-closing, 120 mm long......... 45 28524. « s - and Slide, with weight to increase stability .......................0000- 1.00 28528. w < 3 Stewart, original form, of nickeled spring wire, self- closing.ane eee -10 28532. = wy = ie same as No. 28528 but with ring to hold jaws together notveteeeeees -08 28536. «¢ Slide, Kirkbride’... écsceecciaes ee ko 2 bo Wao 2 Soe RO an Sana CR -10 28540. ss Ss NBOSLON: & wtecivs ste ecloaie le neon Fo) 8.a6 wales va a eialale sol olede ee eieicie cals OCA ERS RSL etek eee eee «20 28544. Funnels, Glass, with angle of 60° and stem ground to point. Diameterjimm:..c-s.eceeee _ 25 40 50 21 160%) i oe 90 100 Bach es civtectcoees « Sees a ote 07 -09 -09 10 12 15 18 Diameter, mM pecs sweeter 120 150 170 200 225 250 300 Bachts icp csiecs 26000 ene 20 as) 50 65 90 1.35 28548. Funnels, Glass, Bunsen, with an exact angle of 60° and with long, thin stems (sizes up to 100 mm diameter have stems about 100 mm long) ground to point and with ground rim. This is an acecu- rate funnel and is not to be confused with the ordinary funnel which we list under No. 28544. Disme tens een arcreictercieicieteisteetotaetote _ 25 40 50 65 75 90 100 110 120 150 Mache Goia aacsecesseee evo ae eee [MS OA CmEaGinne cs si) Lu 28552. Funnels, Glass, Special, exactly as above but with extra long, thin stems. Diameter mam pecs eas oe ere kei 50 65 on 290g 100 Bache. ssircite cei see otacele eee ereicc ns 15 18 .20 25 30 28556. Funnel, Glass, exactly as above but with capillary bore for perfect suction. Diameter smmM ns se tae oe elton sre 50 65 —w® 90 _ 100 LOE Uebel Bee gi cictomini tieiniec tition 6 bn clats tio orci tc emerens 15 18 20 25 -30 28560 Funnels, without stem, as used in sugar analysis. Diameter, mm. se tAD) 90 100 LOE? (EE eRReC RiacmpiGrerncddttioce co sub oo nipEMeanrreaermmceoaa es ac 15 20 25 28564. Funnels, Glass, with short, wide stem; so-called powder funnels. Diameter, “MM 25.5. Kross se occe seo OO eee. Seisias oe eee eS 60 80 100 Miametervohistem\y mma see fee emer eloes lotta eee 14 16 _ 18 LOE agg b oRCeOdbinn Geooricnibcnt cation Uo 20.1005 OmUc aera Spd Cont Ol c05 -20 25 30 28568 Funnels, Glass, with bulb, for filtering through glass wool. Diameter, mm........... 100 150 JOEY Bane poonaotite Ha noprocnemerrccre.s bod co oc cop Seep Eear nop aan asacnescboses 30 45 28572. Funnels, Victor-Meyer, to suspend over evaporating dishes. Diameter, mm..... 160 200 ~—.260 LOE) | Ganiemon sis aooumasoonee ma booouuah oon OdbatbponmoooUoaanonDoDACacosoad 1.00 1.20 1.60 228 No. 28584 : \\ \ \ ——— | ES ipo of No. 28596 No. 28612 No. 28592 28576. 28580. 25582. 28584. 28588. 28592. 28596. 28600. 28604. 28608. 28612. 28616. 28620. 28624. 28628. No. 28628 No. 28604 No. 28608 No. 28616 No. 28620 Funnels, Ribbed, for quick filtering. Of heavy pressed glass with finished rim. Diameter, inches. 23 33 aia __5F 7i _ 8} 10} 13 Bache. ccc. 51s al) ale 5 18 ee 2 B,D Funnels, Glass, with diagonal fluting, for very rapid filtering. Particulary recommended for use with our special filter paper No. 27920 in filtering agar agar for culture media. DIAMebeL MINIM aac seers oe rietelel nae we 70 100 160 200, 240 SACHA gs Sec parepareicis aerate -syntors Sectors eae tees sore eheieiars arses 25 50 70 1.45 2.25 Funnel for use with Morochowetz dialyzing filters, with very accurate angle 12°-15°, and 250mm high .75 Funnels, Vogel, with side tubulation for suction. Diameter, mm........... 80 - 905) 105 LDEYA Ne ono GG a pte See OREO O GC O ON eee AOS See irc tos Se 75 90 rl 00 Funnels, Double Walled, for either hot or cold filtrations, with inlet and outlet tube, 100 mm in CIES IG) Ss SoG Geet Ba rcee Ota da See OO Ce eee erie an pane osonnaaeee nccsaan 3.00 Funnels, Double Walled, with exhaust and silvered lid, 100 mm in diameter................... 6.50 Funnels, set of three for delivering minute quantities; }, 1 and 1} inch in diameter. Per set...... .25 Funnels, Copper, with ribs, 4 inches in diameter. Without stem......................-..------- 75 Funnels, Aseptic Enamel Ware. Of seamless steel, white enameled, both acid and fire proof. With handle we Diameter, INChESs seca tere eicters onore Ole oe eee aces = 33, “eae" 6 oc LODE 0 aonite 4 JEG tts GRO COTS DEG HO AAO OERC oO I om ne Sommers 35 50 75 1.00 Funnels, Porcelain, with perforated sides, 160 mm in diameter......................------------ 1.20 small size, for use as filter cones. Diameter, mm.................- 45 __ 65 ACHE yeyeyayePaters lake: o:e 31 o % feyats sotorsis sraieveie ayelarers lala leerstelele Siam vans) Dio aiets eal eee 5 Raee eee 5 35 Funnels, Porcelain, Buchner, with fixed perforated, porcelain plate. Diameter, MMe. s.r «ae aa 50 65 80 100 125 150 200 DEG beng ooeacupocsusmecosace 55 -70 85 1.00 1.35 1.70 2.05 Funnels, Royal Berlin Porcelain, Buchner, with fixed, perforated plate. While more expensive, this funnel is distinctly superior to No. 28616 in that funnels of the same size have an equal number of perforations of 1 mm diameter in the plate. Diameter ofsunnels mm 574s acre ee nice cists Nae Saloeleclewisle oe 59 Sy he 160 DE Ub Sato aeod COBO GEE DOaGB Dono ae apeadanoreeaennc ane -90 1.50 2.10 4.20 Funnels, Royal Berlin Porcelain, Hirsch, with fixed, perforated porcelain plate. Diameter of funnel, mm..... 50 75 92 103 120 140 163 Diameter of plate, mm...... 36 dt 57 59 59 59 112 Diameter of holes, mm...... 1 1 el 4 ey Les Bach ta. creccne es eee ak -60 75 -90 1.20 1.50 2.10 2.70 Bunnie Hand Rubber, with corrugated spout Sah allows the air i escape so that the liquid flows reely Gapacl byte. setts eae a nee Nici ee tide Ss rer See + pt. 2 pt. 1 pt. 1 qt. HE ee gue act ¢ Racine cia SUPE Re Mees GE i ororomirts : 35 45 -60 75 229 > 28632. 28636. 28640. 28644. 28648. 28652. 28656. 28660. 28664. P) No. 28632 No. 28640 No. 28648 Funnel, Hot Water, of heavy, polished copper, double wall, on three iron legs. Much superior to the ordinary article made without inside wall of copper. Including a glass funnel No. 28544, 150 TNT (ALAMO GET os sinyc.cin oye overs. 076 above raya ated ravers alate el eiera eters) s10)8; 5.6 asia Og SINE Soldier aR Oe ee 6.00 Funnel, Hot Water, double walled, with constant water level, Bunsen ring burner, clamp, stopcock and glass funnel, 150 mm diameter, but without support 7 Funnel, Hot Water, same as No. 28686; but with'support 0.2.0... scenes see eee eee 8.15 s for electric heating, particularly recommended for filtration of culture media. Of copper, with constant water level and stand and connection cord and plug for electric light socket. Voltage must be stated in ordering. Including a glass funnel, 150 mm diameter... 16.00 Funnel, Hot Air, Lothar Meyer, of copper, double walled. With ring burner, support and a funnel, 120 mm diameter............. Bie Ah SOOO RAAT Iae oso ede Sia bc wveielecoie select 10.00 No. 28652 No. 28692 No. 28664 No. 28668 Funnel, Hot Water, of tin, with double wall.. visas iglals Guy due 4 a/blele bes ao ESE oe ee same as No. 28652 but of ‘copper r throughout « ls olaje level ae seleis cs Rictoe neta) arene eee 4.50 Funnel, Hot Water or Steam, consisting of a lead coil and one glass funnel, 170 mm diameter..... 4.50 Funnels, Separatory, of heavy glass, with glass stopper. Capacity tCC.cmcoceet eee eee ek 250 500 1000 2000 4000 Bache stk ca sas ci ee ec ae ae 2.00 2.25 2.50 3.00 4.00 Funnels, Separatory, of heavy glass, with angle 60° and stem ground to point. Diameters mmo See fe are 100 150 180 __ 200 240 BB CHS IE scents oR. Sine ce le eee : 1.50 2.25 2.50 3.00 3.75 Funnel Separatory, (Terrapin Separator), as used in the U. S. Department of Agriculture, Bureau of Chemistry, for the handling of emiscible liquids which separate with difficulty because of their tendency to form emulsions; 200 ce capacity, with ground in stopper and stopcock.......... 3.00 230 28684. 28688 . 28692. 28696. 28700. 28704. 28708. 28712. 28716. 28720. 28724. 28728, 28732. 28736. a oH ~Y> GR El. i Sakis 6©) SMU TAT 5S COTM SR ASN, ay. 4 No. No. No. No. No. No. No. No- No. No. No. No. 28680 28684 = 28688 ~ 28696 28700 28708 28712 28716 28720 28724 28732 28736 Funnels, Separatory, bell shape, with open top. (Chee Glin 6 Gs cansnantbanche cone Cero Se aaa EO ae dec Dos ea 25 50 75 100 Hache st eet =. 5 tA PRU Re Sie CEN. One eee ee 80 1.00 1.10 1.25 Funnels, Separatory, cylindrical, with open top. Capacity CCigeaa- peck cite tree eRe _ 30 50° 100 150 200 250 BAC eens aye trete lo Scie traeaeS Sie Keen Simeone -90 1.00 1.10 1.35 1.50 1.75 Funnels, Separatory, cylindrical, with ground glass stopper. CanaciyeiCCh: Mica ssa cna alee naeanbnroene 30 50 100 150 200 250 LOEN) De Satelite ory Mande ea 8 Bae oe 1.15 1.25 1.35 1.50 1.75 2.00 Funnel, Separatory, cylindrical, with ground glass stopper and short stem, of stout glass. (CEN SERN ol CONS ches Gee a ae mrs cig See IR Me es eel re irdlirer ne 500 1000 1 DEO) Ub cic see tihe Gees ee aenreereit cet Cee ea ee REE ie he Re nae Pe Rone ae 2.50 3.25 Funnel, Separatory, cylindrical, with ground glass stopper and short stem, exactly like No. 28688 but graduated. WADA ty mCO Nea ate erayais secre aushesclerd eisle! Sierahoie ate eaten PC eee EE 500 1000 1 ENC ES ete a s Ess onuDas OS SOMAOndOUEROND Sedo enomaddooOONoU SO OUCOS sonaduonE 4.00 5.00 Funnel, Separatory, cylindrical, graduated, with glass stopper and air vent. (CETSOTAG: CES Gs caes decom mac aan amet sate Eee ae eer aan co tdnctcmoane ns Sobocu au 100250 [DEXA 85 ota Sorte CA OI AAG ee OS SNe OETA eT Oh ee BRICISCHED OCR ae 2.00 3.00 Funnels, Separatory, pear shape, with ground glass stopper. Capacity CCl asso seni ne SOG 125 250—«500 1000 ~—-.2000 1 DEG en See nee ee 1.00 1.10 1.20 1.50 2.00 3.40 5.00 Funnels, Separatory, same as No. 28700 but with air vent in stopper. GapacitvaeCehscoecc certs er ene treciacie te costeaie 125.250 500 1000_ 2000 LOE (8 2 Gg Rae eC AES asses ca ie cite aac aCiee “1.50 2.00 2.50 3.90 5.50 Funnel, Separatory, for ether separation in nickel determinations. The outlet stem is moderately long and of small caliber so as to hold acolumn. Specially designed for use in iron and steel LS boratonies- Capacity MA OULCOS soce Si cyacioc tote oie aera NA ee ne ree at tee lacks Funnel, Separatory, for nickel determinations, as described in Blair’s ‘‘Analysis of Iron and Steel,’’ 7th De kyon 1 Es con aarti a een anne eae Sear eee eater a tictariatia ace cee ob aa eens 3.00 Funnels, Separatory, Squibb, with ground glass stopper. Waipaeit yao tans semi ireetean ie eet coeae caw atsicia’ sue Moves ising mierera eee ejeteterererels 125 250 ———500 LEG Ue So ape Oem GS Oe nee Ee Comin cote o Ramen ec 1.50 1.80 2.40 Funnel, Separatory, for sulphonation test of creosote, as used in the Forest Service of the U. S. Depart- ment of Agriculture. With graduated tube above the bulb. Capacity 125 cc............. 3.00 Funnel, Separatory, LaWall, for preventing the formation of emulsions in shaking out with im- miscible solvents. See Journal of American Pharmaceutical Association, April, 1914, p. 498. The liquid to be extracted is placed in one bulb, with sufficient water to completely fill the bulb and the immiscible solvent is placed in the second bulb. By inclining the apparatus, with the lighter of the two solvents in the lower bulb, extraction is easily accomplished by the passing of the liquids through the construction between the bulbs. Recommended for use in the assay process for alkaloidal fluid extracts. Capacity ofibul bs ic ctyeems. sire sas coi os et oto iat mnie raysiere vito eoeclsiei 25 0 00) LD (hegatants GHOBORO Sh. D6e 5.0L Co ema en ea nH ae OOmen Cn cree scr ec rre 1.50 1.60 1.75 Funnel, Straus, for estimating lactic acid in patie juice; with glass stopcock .................. 1.25 Funnel, Dropping, Walter, for examining single drops. Capacity, GO COS rer aresscrsickcr ays sree aiere retere icles 1.50 Funnel Attachment, for use in filling test tubes, flasks, ete. It prevents contact of fluid with the surface of vessel being filled so that the latter remains clean for the insertion of cotton plug. Inchidine rubberitubing, and pincheock,......eesssteos toca taeaneeeterte aeie eee nee 50 231 Oo. op Li oH 00.LH'W © No. No. No. No. No. No. 28740 28744 28748 28752 28756 28760 28764 28740. Funnel Tubes, straight, with’ conical top. No. 28768 LOE? UE Renee er no oonubooandcon dao nespoononuocodunadossas 28744 Funnel Tubes, straight, with thistle top. Length, mm JOENS Ub page an Gb conandodobocasoonaddooonmnonaonoToeposunNe 28748 Funnel Tubes, with loop and conical top. Length, mm LD: d | Vo ee BREE Ano Hoo odsds no os dcadtanamEnapocsnouoreabenetonoatcgcs 28752 Funnel Tubes, with loop and thistle top. Length, mm 300 LOEYG Ut Speen ge tad heen B be ot cqdabe aE peu conaanononterooE cons ood RS 15 16 -20 28756. Funnel Tube, with loop, one bulb and conical top. Length 300 mm....................00e eee 25 28760. “same: as. (No. (28756 but with: thistle Gop. «...<15/..2 icici siecsje10 ole oleyeieleisielelotsietelerers eee +25 28764. . Ss with double loop and one bulb on each side. With thistle top; length 300 mm..... 25 28768. ss Oe same as No. 28764 but with bulbs near top and with short stem.................... 25 28772. Funnel Support, for holding funnels on beaker. Diameter, mm . LG ESO 100/20 ACD co cei ces cco nrajar vitor COE es eee cle eee 28776. Funnel Support, Ostwald, of brass wire, for one funnel...) dcee0. ase cos ese eee eee eee as above, but adjustable i in height from 15 to 24 cm No. 28784 No. 28788 No. 28792 28784. Funnel Support, of Ww ood, for one funnel Biielstaldieteieiare eels coe de nea ets oe te 28788. « 28792. ss s oe 28796. ‘ Ee tyade any 28800. “ “ ce “ No. 28804 28804. Funnel Support, of wood, improved pattern. 1 DE: | Wan ana a aHOd aaa nOoGoa Gocco noon oosonadob seecomemonncoSo0 Goaccoce ee. 2.75 4.50 28808. cs Support, Schultz, of brass, nickel plated, adjustable in length from 40 em to 120 em and adaptable to from 1 to 20 simultaneous filtrations; with 12 triangular funnel supports...... 15.00 232 No. 28820 No. 28828 Funnel Support, of wood for six funnels in one row, with slotted holes........ ; twelve funnels, six in each row, with slotted holes .... Funnel Support, Leach, for separatory fninelase.7 = 5.22 are See « for four funnels, of wood with metal clamp, for attaching to ) support Funnel Support, revolving form, a very convenient new model. view in Salesroom Showing Arrangement of Samples 233 , a 28916. 28920. No. 28904 ‘a |! If =e wi nr No. 28908 No. 28912 No. 28916 Furnace, Fletcher Crucible No. 15, for operation without blast. Takes crucibles up to 4 x 3} inches. For operation with either illuminating gas, natural gas or gasoline gas. Requires } inch diame- ter gas feed pipe. Price includes 6 ft. “of pipe, a No. 3 clay crucible, clay cylinder and tongs 16.00 Furnace, Fletcher Crucible No. 40, for illuminating gas only. Requires blast from foot blower such as No. 21968 and #§ inch gas supply pipe. Takes No. 00 clay crucible. Complete with one No, 00erucible; butiwithout) foot’ blowers occ soc occiecis ces cclocleisocieleietel tale iere eee ee eee 3.50 Furnace, Fletcher Crucible No. 40a, Injector. For use with illuminating gas, natural gas or gasoline gas. Requires ? inch supply pipe and takes a No. 00 clay crucible. May be used with foot blower No. 21968 and, where regular gas supply is not available, with gasoline gas generator Complete with one No. 00 clay crucible, but without foot blower: 2.2. .-ss-s eee 4.00 Furnace, Fletcher Crucible Kerosene Blast No. 40B, for use with refined petroleum or kerosene oil. Requires foot blower No. 21968 and takes No. 00 clay crucible. Complete with one No. 00 clay crucible butiwithout) foot) blower....5....csoocee cee seaecineee niece eee eee eee 5.50 Furnace, Fletcher Crucible Kerosene Blast No. 41E, similar to No. 28912 but larger. Complete pit one No. 1 clay crucible and two burners, but without foot blower...................---..--- 10.5 Furnace, Fletcher Crucible Kerosene Blast, similar to No. 28916 but larger. Complete with one No. 3 clay crucible and three burners, but without foot blower.................+--2---0+- 13.00 28924. Furnace, Fletcher Combined Muffle and Crucible No. 141, for use with illuminating gas, natural gas or gasoline gas. Requires foot blower No. 21968 and 1 inch bore supply pipe. Takes a No. 3 crucible or a muffle 3} x 27 x 6} inches, or, when used as a crucible furnace only, takes a No. 6 crucible. Complete with muffle and one No. 3 clay crucible, but without foot blower..... 11.00 No. 28924 234 28928. 28932. 28936. 28940. No. 28928 No. 28936-40 Furnace, Fletcher Muffle, for exact temperatures not exceeding that of the fusing point of copper. For use with illuminating gas, natura! gas or gasoline gas. Complete with muffle, dome, cru- cible tongs and 6 ft. of pipe. Number...... ddnsadoousesssenoS Rene 3 4 5 6 Muffie space, inches................. 5} x53x5)} 7ix6}x52 8x73 x6i 10) x 95 x 8% Bore of gas pipe, inches...........-. ; $ 1 1 LOPS Naik areas CeOSe d Su Cre Cee 17.00 22.00 35.00 45.00 Extra Domes or Muffles, each....... 1.00 1.25 1.50 2.50 Furnace, Assayer’s Combination, Brown, fully described in “Manual of Assaying Gold, Silver, Copper and Lead Ores.’’ For use with illuminating gas, natural gas or gasoline gas. Consists of three furnaces; the one on the left for roasting sulphurets, the center one for crucible fusions, taking a plumbago crucible 4 inches high by 3 inches in diameter, and the one on the right for scorification and cupellation. Complete with plumbago fittings, chimney pipe, horizontal gas pipe and three # inch taps, as illustrated, but without vertical gas pipe, fire-brick covered bench GY nr slang leis oe an a eee enti Eee ene aE rEInn Ae. obo dasamsa coReanoosec 57.00 RIre- Bricks CovercosBench extras (tic)... os aici ene oie cso she 3.5/0.0(0, $0) 2 Ee eee oe wee Seley 1 EsO0 28944. Furnace, Wiesnegg Mufile, original French make, for incinera- tion. As supplied by us to the Food Laboratories of the U. 8. Department of Agri- culture, etc. Muftle dimen- sions 115 x 70 x 165 mm. Complete with muffle and 5 Pasiburnersu--ce eee 16.00 28948. Extra Muffles, each... .75 28952. Combustion Furnace, Fletcher, for ordinary gasoline or natural gas. For high temperatures it should be used with Foot Blower No. 21952 or other form of blast. Length of furnace, inches 2 18 24 Each. 12.00 16.00 20.00 28956. Extra Fire-Clay Tiles, 6 inches long, for use with Furnace No. 28952. Hach..... 5 cat) No. 28944 No. 28952 235 No. 28968 No. 28972 No. 28976 No. 28960 No. 28964 28960. Combustion Furnace, yon Babo-Erlenmeyer, a widely used and satisfactory model. With Bunsen burners with both stopeock and air regulator. INumberiof burners: «..).:cn1 ve) 29032. 29033. 29034. 29036. 29037. 29038. 29040. 29041. 29042. 29044. i “He UR H. T AH Ore Mes Ass CG “OR IME Rae AP ENG ay No. 29044 No. 29033 No. 29041 Combustion Furnace, Heraeus, Type A. Wound with platinum ribbon fora maximum temperature of 1400° C. The inside diameter of the tube is 20 mm. Voltage must be specified in ordering. 44 60 Prices include platinum. Length of heating tube, em............... 22 EFurnacevonly, withoutirheostat.-~ coc ce- cic(o «00 voces vines wis wineioresie ieee 47.50 63.00 72.50 se with theostat for 10) volte oleic cc 20ers. s «orale etenee eee eee 61.50 85.00 98.10 se GE OPA Ni Whiter 6. asa Se OROaEadeoes chiens eich Rees oe ee Oe 85.00 98.10 Combustion Furnace, Heraeus, Type B, exactly same as No. 29032 but with tube 30 mm inside diameter and maximum temperature of 1350° C. Length of heating tube, em.. 20 30 40 60 Kurnace only;awithout rheostat.; macminestseiate ree sec elo) ius ieee eee eee 57.00 69.00 78.50 90.50 s with theostat for DL OsVOLES ea oreteyetctate ooo, ols ticle ous wove elnjerclereielsia secloecimte 72.00 91.00 104.10 124.50 < SZ A Beye ateberehovorshein\sisiejo:sia;e;<\e.si wis tyslshepsvepere spices eteteten eee 91.00 104.10 124.50 Combustion Furnace, Heraeus, for Reactions in Vacuum or in Gases other than Air. This is a platinum wound furnace of the same type as No. 29032 and No. 29036 but with larger internal chamber so that a special tube with closed end may be inserted. One end of the tube is provided with connections for the thermo-couple of a pyrometer and the other end with a mica observation window and inlet and outlet tubes for the gases. Tubes can be used of Royal Berlin porcelain, glazed inside and outside, opaque fused silica or Marquardt mass. For temperatures under 1000° C. the Royal Berlin glazed porcelain tubes are recommended as being more likely to be entirely gas tight.We guarantee none of the tubes to be absolutely gas tight under all conditions. With silica or Marquardt tubes a temperature of 1300° C. can be obtained. Prices include a suitable tube of Royal Berlin porcelain with the end fittings as shown in illustration but do not include pyrometer or thermo-couple. Inside diameter of the tube is 1; inches. Teengthiofjheatings surtace; (cms: -csctermicetcteteeieisie 1 isis lowe. Ie eietetemtoeeeeeeee _ 30 60 Furnace; without rheostat: 27. co5ocecc tase Celestial se he (olearete zu bee sicko oe ee 93.25 142.50 sé with.110' volt rheostat: 2s. co. 525 so smcsselticia le alse aie sis scale een nee eee 127.25 185.00 ce pally CPE Sao ee ea son on snd OR OREO ODe Pod asacaoonaurcs 127.25 185.00 Combustion Furnace, Heraeus, for Organic Analysis. Consists of two mutually independent fur- naces mounted on wheels which operate on top of a supporting frame. A grooved metal trough extends through both furnaces and carries a combustion tube which should be about 90 cm in length. Each furnace is provided with a separate rheostat. The larger furnace is 35 em in length and will cover a charge of copper oxide about 25 em long. Prices include platinum. Woltiages ss irri Ac ardetiin TSR Serer croc ee etetetevohe lapis eich ctereve-<. ieee Sees 110 220 Baachigns)o oi eto 22. a Uk a Saas oars teow alele cistote e otcrea oe roige 135.00 124.50 DCR es el bl 3) RR H. Te Et FOe SMie YAS 2S: GeO), AM. SERPs PAs ONS FY: No. 29048 29048. Combustion Furnace, Heraeus-Dennstedt, for elementary organic analysis. See Zeitschrift fur ange- wandle Chemie 1905, 18, 1134. For 110 volts the furnace takes about 16 grams of platinum and the 220 volt takes about 8 grams. This is not included in the price and is added to the cost of the furnace at market price. The glassware and supports constituting the train after Denn- stedt are not included in the price nor is the combustion tube. Furnace only, for either 110 or DOME OILS SUD LY ROO. =o crete ease 5 loso. 2 aic.0 0/5 o:s1avaiisiietrerel olo)otofotebeloreyafereia\ shel -t-tst=|niol=lalaeeorelalelecrleleimickara'si= 82.50 29052. | Complete Set of Glass Parts, rubber connections and supports for above, outfit to be arranged as shown in illustration. Duty Free 27.00 No. 29056 No. 29060 Furnace, Electric, Hoskins Crucible Type FA, for operation between a minimum of 316° C and a maxi- mum of 1000° C, for either 110 or 220 volts alternating or direct current. Life of the heating element of nickel chromium about 1000 hours if operating temperature is kept at maximum or below by means of rheostat which should always be used in connection with the furnace for safety as to burn outs and accurate control. Power consumption of No. 101 is 450 Watts and of No. 103 is 1000 Watts. Voltage must be specified in ordering. BNIUITIAO CLA eu ere tie eterna syns nsa ero ain alee esrice: pacveicne: Sree lc he Sa RRS FA 101 FA 103 FA 104 Internal dimensions of chamber, inches................... Do Pry 4x4 iy 5% 6 CAOAT, TRIES CTS 5.5 Seen on oee oan coe rea Soe Connie een ponce nae a. 18.00 40.00 60.00 29057. urmaceswithirheostatelicerc nis = fees octecs aust esis tats wiarete acs Seinen 23.00 48.00 70.00 AV UII WINK CONETOTIY mane ty Nth = oe es tislaotie ean etree 1.00 2.00 4.00 eating nUinitern seer toe eis tides wn as does ee aaa sloooe ees 1.00 2.00 3.00 Coreswound withiwires. secs J osc sees si senate aue 4.00 8.00 13.00 specified in ordering. LN] Stal oS) ao cee Ganic Gore cE e.oo OOOO OD DED Coa noo aanorecaocs FB 101 FB 102 FB 105 Inside dimensions of chamber, inches................----- 13x13 DR25 4x6 29060. DEEMAC CLOMLL Yee ee ee re cetacean euareausin cis SO ete ciere 18.00 20.00 60.00 29061. Furnace with Rheostat and Transformer, 60 cycles..... Sa orte : 41.00 45.00 109.00 29062. Furnace with Rheostat and Transformer, 25 cycles..... oh Sorte 51.00 55.00 122.50 xtraveleatin GiUMitsa cee eee ee rsa rice cere cyan eet 3.00 4.00 8.00 Note Regarding Use of Hoskins Type FA Furnaces All Hoskins Type FA Furnaces are wound so that when connected to the proper voltage (110 or 220 volts alternating or direct) which is always stamped on the name plate, they will reach the maxi- mum safe working temperature of 1832° F or 1000° C in approximately one hour. The Type FA Tube and Crucible Furnaces require approximately 40 minutes to reach this temperature. If these fur- naces are left on the full line voltage after they have reached 1832° F the temperature will continue to increase and the resistance element will consequently burn out in a short time. To guard against this, a rheostat should always be connected in series with the furnace, and after the furnace has reached the desired working temperature the rheostat handle should be turned back part of the way toward the starting position. The proper point at which to set the rheostat handle in order to maintain any desired temperature may readily be determined by trial. Where the furnace is frequently operated at the same temperature it is convenient to make a mark on the rheostat at the proper point for main- taining this temperature, and after furnace has reached the proper temperature the rheostat handle can be set at the mark and left there. thus insuring that the proper temperature will not be exceeded. 239 29064. 29065. 29068. 29069. 29070. No. 29064 No. 29068—Rear View of Type FB202 No. 29068—FB206 Furnace, Electric, Hoskins Muffle Type FA, general specifications the same as above with the exception of shape. FA 201 consumes 1100 Watts and FA 204 consumes 4150 Watts. Voltage must be specified in ordering. Number... S360 ones sate FA 201 FA 202 FA 203 FA 204 Inside dimensions of chamber, inches... 33x 2}x5 4¢x3x8 52 /X 02.X9) (Reo eeld Furnace only...... ey eT Oe oo 35.00 50.00 65.00 80.00 Furnace with rheostat. . Eh RIE : 43.00 60.00 85.00 110.00 Alundum Mufile only............... ef 2.50 4.00 5.00 7.00 Heating Unit... y a 2.50 4.00 6.00 10.50 Muffle wound with wire..... 9.00 13.50 18.00 28.00 Furnace, Electric, Hoskins Muffle Type FB, operating within the same limits as Type FB Crucible Furnaces above. The control on the small size FB 202 is by means of rheostat with transformer but in all of the larger sizes is accomplished by means of regulating transformer only. Furnaces FB 206 and FB 207 are furnished on wire stand as shown in illustration. INUMBDEES Asc son S ee oe eee FB 202 FB 204 FB 206 FB 207 Inside dimensions of chamber, inches.... 44x3x9 732x5x 12} 12x8x19 12x8 x 26 Number of Heating Units...............- 10 10 14 14 BUENA COXON Yr 5.5 65.o00c 85 oe aOR: 60.00 95.00 250.00 300.00 Furnace with Rheostat and Transformer, 60 CYCLES Serv atcfoste seh cee ee 116.00 190.00 422.00 486.00 Furnace with Rheostat and Transformer, 25 CYCLES Ma athe Sr es cra cig ee eee 132.50 210.00 481.00 554.00 HeatingsUnitseachssccen ace 1.00 2.00 3.00 4.00 Note Regarding Use of Hoskins Type FB Furnaces Hoskins Type FB Furnaces which are operated in connection with rheostat control, i. e., Type FB 101, 102, 105, 202 and 301 are controlled in the same manner as Type FA Furnaces, the use of the trans- former with the above mentioned Type FB Furnaces being simply for the purpose of stepping down the line voltage to the proper pressure for these furnaces. 240 No. 29072 Nos. 29076 and 29080 Furnace, Electric Arc, Moissan Type, new model for experimental work. Current consumption 100 amperes at 50-60 volts. Accommodates a crucible 50 mm high by 45 mm diameter or a dish 35 mm high by 28 mm diameter. Without cables. MU by PEON. ee ciatenic ois crarssaucst eee 49.50 DutysPaidss5.-ceereeer eee cee 65.00 Accessories Duty Free Duty Paid 1 pair Cables, 150 cm long, wWithecOnNnectlONS=sh-ciecmaceineeeicoceeteer 11.40 15.00 Extra per meter per pair when cables longer than above are required 2.85 3.75 Carbon Plectrodes;, 350)x 22;mmy) per pair! <.. <1.) ca 1s see AS -60 Carbon Crucible with depression "for electrodes). .3}5:s.cc1ms1 st chee eas: 27 35 Magnesite; Cricibl en)... rss comideee elses») semiarancere os eb ces See oeeS 30 40 IVE RENESIAL ON UGID LG errs e rc ative) Sater rete Ts ica eae! vero teinya “cl dara axSie aol aes STS .60 .80 CCH OTT DTS Ae AS 2 pete Se a ee Oc a ee anne ee ua 27 +35 hy Eva SSI on] DSS) 1 ee bins GOL c Rene a nen aE rier on erence oe Al 35 MITT EINES hos oganboododanos poognde0 GanboosoaGonaanaagDoupeUNS: -60 -75 Note—Duty Free prices are extended on Accessories only when they are ordered in connection with the Furnace and complete outfit. Furnace, Electric Arc, Moissan Type, new model with carbon adjustment. Current consumption 100 amperes at 50-60 volts. Will accommodate a dish 100 mm in diameter by 55 mm high. With- out cables. Ut COB yore cceieyaversretnre ween 87.40 IDHAP ELT Be Googocdvoccsdadboonood 115.00 Accessories Duty Free Duty Paid 1 pair of Cables, 150 cm long, with connections...................-+- 11.40 15.00 Extra per meter per pair when cables longer than above are required 2.85 3.75 Screenpot colored alass yates rstsrers ote cr ejstccvey ete ascrs/sue aint save ce etciayeotaleler eds re 4.50 6.00 Carbon Dish, 100 mm diameter ROS nae oh ein eda dich Grae 35 45 Mae TeESILEPIDIS sep ccm ene pete Mya, Seg ape je gay a fuse veveae veer ore icareneya Medes 45 -60 Magnesia Dish, “ ss I Parecg eich ats. cjeserevepy ora ats iniats Se Sete heen 95 1.25 Carbon) Electrodes, 500 x 22 mm, per pair.....:....-.....c2eeeseee sss -60 75 Furnace, Electric Arc, same as No. 29076 but with a current consumption of 200 amperes at 50-60 volts. Without cables. DD UutyARree see: soe eee cee eral 136.80 Duty Paidscsnc so cescenares eeisseeiere 180.00 Accessories Duty Free Duty Paid 1 pair of Cables, 150 cm long; with connections:.........--.--92992+--e- 19.75 26.00 Extra per meter per pair, when cables longer than above are required. 9.50 12.50 Screentolicoloredielassipmcmen cette coe saline cecinicie salem eiciereeioleleeierale 4.50 6.00 Carbon Dish, 100 mm diameter Mra eyctatetelavorss eave states e haatere area NRTA 35 45 Mae nesitenU vis ltmeaime aca Meimn mine cva¥ay-\si51 5, sr-0 (ors, css iexeccimieeneiece ekeneteesusieteretareioie 45 -60 Magnesia “ or G eo dagoonsundcaruonnapsanconoeconboodtas -95 1.25 Carbon Electrodes, 500 x 40 mm, per pair...........2.. ee eee eee eens 1.60 2.00 Furnace, Electric Arc, for Continuous Operation, for the handling of oxides difficult to reduce, such as chrome oxide, etc., as well as more or less infusible metals. The oven may be filled’ through the funnel at the top and emptied through the spout at the side. Dimensions of melting chamber 140 x 100 mm. For current consumption of 100 to 150 amperes at 50-60 volts. DUtyiR reeset sci n emnertecle- 95.00 Duty Paid. cosceicicra siessisitnerecere 125.00 Accessories Duty Free Duty Paid 1 pair of Cables, 150 em long, with CONNECHIONS <5 .crstaeie are 16.00 21.00 Extra per meter per pair when cables longer than above are required. . 4.50 6.00 Colored Glasses with one pair of extra ‘glass GIStSaaswececs vaecc eee 1.35 1.75 Crucible of Carbon, with outlet tube........ ws olacdeteyscagelsperateceitee EES ee 3.80 5.00 se , Laboratory Form, Fig. 17 of Bulletin 42, Complete with four iron supports, tubing, case, etc..................- 56.00 29360; ‘Complete Setiof:Glass ‘Parts only... ..-.. 2. 027 sone dss bow Anetinee s oeisine ceeia see ee eee 35.00 29364. Gas Collecting Tube, Haldane, with three-way stopcock at each end, capacity 70 ce.............- 4.00 29368. Gas Absorption Tube, Blount, for moisture and carbon dioxide. See Haldane ‘‘Methods of Air Analy- BUSH te hic eee onic No. 29372 No. 29376 29372. Gas Analysis Apparatus, Haldane, Portable, for general air and gas analysis, especially designed for physiological investigations. See Journal of Physiology, Vol. 22, 1898 and Fig. 10, Haldane “Methods of Air Analysis,’ 1912. Complete in wooden case, with rheostat for controlling the current’ to the) platinum! spirals 5-4 ae ccenecre aeie ie oie ee cei eee ee eee 45.00 29376. Gas Analysis Apparatus, Haldane, for the determination of very small percentages of carbon dioxide in the physiological investigation of air in ordinary rooms, schools, factories, ete. See Journal of Hygiene, 1901, p. 109, First Report of the Departmental Committee on Factory Ventilation, 1902 and Fig. 11, Haldane ‘Methods of Air Analysis,” 1912. Complete in wooden case... 32.00 Official EnglishiCertificate\for aboves. sn noe eee eee eee 10.00 29400. 29404. No. 29392 No. 29396 Gas Analysis Apparatus, Petersen-Palmquist Anderson, for the convenient and exact determination of CO: in air. The standard apparatus for investigations of ventilating and other sanitary con- ditions of schools, factories, etc. Complete in case...............-2----2000 eee eee e eee 50.00 Sulphuretted Hydrogen and Ammonia Apparatus, Tutwiler, Standard U. G.I. Form. This apparatus gives direct readings in grains per 100 cu. ft. of gas of H2S or NH:. It affords a simple and accurate method for determining the efficiency of the condensing, scrubbing and purifying appa- ratus in gas manufacture. A determination may be made in less than three minutes. In portable case, with chemicals necessary for operation................2-2e- eee eee cece ener teense 25.00 Apparatus for Determining Hydrogen Sulphide in Gases, Johnson, Patented, a new system offering the advantage that accurate results may be obtained from small samples of gas as compared with the gravimetric method and that the time needed for a test is greatly shortened............ 18.00 Apparatus as above but in case with necessary reagents.............----0- +--+ 2222-2 eee ee eee 30.00 No. 29400 No. 29404 Gas Apparatus for the Quantitative Determination of Sulphur and Ammonia, consisting of an ammonia saturator and automatic shut-off meter registering from ;;5oth of a cu. ft. to 100 cu. ft. a double dry governor mounted on stand and a London Gas Referee’s sulphur determination apparatus, mounted as illustrated. The apparatus conforms to the latest modifications of the Bosrdrote london Gas Rererees ce . 55. n.-o se olce eee ines ae ooo eierckents Settee reteietee letra 115.00 Sulphur Determination Apparatus, only, as used in above outfit, complete with burner and support 15.00 249 No. 29424 No. 29428 —S) VV NARARARAADRA Ve a - [2 oak Ne) OD MOEA 2 \ ; ia Lee — AS) t : i | H | No. 29432 No. 29436 No. 29440 No. 29448 No. 29452 No. 29456 No. 29464 29408. Gas Bags, oval, of pure gum, without stopcock. Capacity calllonsiec ess e+ saesrc esate ag 0 i be) Sa aC Heretic teense sic g wicnals Siete wropermerarehere ae le 50 2.00 2.40 3.50 4.50 29412. Brass Stopcock for above gas bags, to,connect with tubing..........-....-ee oe eee 1.00 29416. Gas Balance, Lux, for the automatic determination of the spec ifie gravity of gases. In glass case with levelling screws and sEaeit level. Duty Free Bae te ae 116.00 Duty Paid. 3.7.5.2. 5eee eee 160.00 29420. Gas Balloons, of blown glass, for w eighing gases. care slags aera see A B Cae) LDEXO honin pad cog SoG Sena eniatks ciao. obs ‘ seioesis esis. c DLOOWMIES ORES ORD 29424. Gas Generating Bottles, stout walled, for gener: iting g: ases, ete. Capacity, cc...... : = ees 125 S200 500 750 = 1000 lDEX Ranadecocooocuorgscopp Rane aOCOnor oOo oon. 12 18 25 35 40 29428. ‘Fittings only for above gas ; bottles consisting of thistle tube, rubber stopper and outlet tube. Tio: i ccna eet cat actin va eee 125 250 500 750 1000 [DE Te URANEIs Mcuni7d. oon Ona titkee Sec Memo atic ‘35 35 35 40 40 29432. = Fittings only is above gas bottles consisting of safety thistle tube, rubber stopper and outlet tube. AO fit, JCC! scezcrerste eitieieteier einer as. Brn 125 250-500 750 1000 LOEV) (Orga er ee an B. oolG US ot nea cce a aes 40 40 45 45 50 29436. Gas Generating Bottles, with ground glass stopper, safety tube with glass stopeock and delivery tube. Capacitive costs ctcerntebe tetrctact-y-vaVale/olsect-\-) ls osvoieveeders Sine cece a oe 250 500 Ba chs. Sos dais coe tee Sie on es ae ; sis Src sys ATOR 2.00 2.50 294140. Gas W ashing Bottles, Allihn, with Stoppers WWapacktyacet-ense ee eee 250 500 ~—:1000 Bach 2 a0oy oe eee ere oe eee 6 Oe As, oe 1.50 2.00 2.50 29448. Gas Washing Bottles, Bunsen, with rubber stopper. Capacity, ce. ........ 125 250 500 LOEYO ea ache SR RIRRIEEA A.cinG Gnd Oc oo Dae mica One e Goes odd oeSseioe na 40 50 -60 29452. Gas Washing Bottles, Drechsel, high form. C: aps UCLUY>) (COs sem...) LOOP | 150 250 500 HENS Weta ge acto Guetashaoes caccedSuccdboodoasgooueaae san 6S 85 1.10 1.35 29456. Gas Washing Bottles, Drechsel, low form. Capacity, cc... . 100 150. 250-600 Bach secre cictetus acs etsiho erate sete eae 75 1.00 1.10 1.35 29460. Gas Washing Bottle, Friedrichs, new spiral form, on glass foot. ..4 5....00. 6 eee 4.00 29464. with spiral tube inside jar, without metal support. Size jm aye Sayers) sists B25 Sars) Serco ad eames es ET erseew accra eck 200 x 40 300 x 50 LORY) BARA RRR SRE Rae nn rahe eeoo cake odie cos Serre om MORE ar iN a5 3c 4.00 5.00 29468::-.. ‘Metal(Support; for aboves. ¢ 32s ar cais sissies trae ie ac es eines. oe See 1.00 1.00 250 > 7 4 jae, e nw be 4 ae ° = > wn O ° = vU > Z x No. 29472 No. 29480 No. 29484 No. 29488 No. 29492 29472. Gas Washing Bottles, Muencke, with wide mouth. Capacity, ec............ 100 250 ee) LOE AEE Bociar noel fon Oo RA NIO RO CSO ICAO een ate Icke 1.25 1.50 2.00 29480. Gas Collecting Tube, with bulb in center and two glass stopcocks.................-.-.-.-.----- 2.50 29484. . tS ““ - long form, 125 ce capacity, with two stopcocks...................--- 2-50) 29488. Case for above, of polished mahogany, with fittings. To hold tubes................... 4 6 LOEYY TSconodseqooduus acon doo oadh orc do ROR RGEe EE Ree Eeecsonae LEME eS sodacncne 6.00 7.00 29492. Gas Collecting Tube, short form, 125 cc capacity, with two stopcocks..................-.-0..005- 2.50 29496. Mailing Case, with screw cap, for convenient mailing of No. 29492 gas collecting tubes........... .15 29500. Gas Collecting Tube, Winkler, 12 inches long by 4} inches in diam.; of zine with brass stopcocks.... 3.00 I ? t Cece [ON Povpajhin| Peron ores rete denfenjaanpenp No. 29524 | ETN TOOL FORT EEQEN INN TRY RR Tuten ficafin ti Crees RR No. 29504 No. 29508 No. 29512 No. 29516 No. 29520 No. 29536 29504. Gas Burette, Bunte, without water jacket. Graduated to 50 cc in yoths, with two stopcocks.. 5.00 29508. as ‘ ‘same as No. 29504 but with water jacket... .. 0.50.2 -mcdee nececre esses 5.75 29512. 33 os Hempel, on weighted wooden bases without stopecocks. Per set..............-.--. 5.00 29516. Gas Burette, Hempel-Winkler, with glass stopcocks, on weighted wooden bases. Per set........ 7.50 29520. Gas Burette, Hempel, with correction for temperature and pressure, for measurement of gas volumes varying between .5 and 100 ce. With stopcock and levelling bulb, complete as illustrated .. 12.50 29524. Connecting Tube for gas burettes..............0..20.-2eeecees oc onsndgHT Ss De dd BNeOOODOo eS Sor 15 29528. Levelling Bulb, on iron stand, convenient for use in gas analysis and other purposes............- 1.50 mare (EET Soran Pt ol aban enn on no SOS Menno onned cece aeoonoccoobos pHeonaocdnooceooneeeapr 75 29536. Gas Burette, Standard U. G.I. Form, being Tutwiler’s modification of Hempel’s burette. With ma- nometer, correction tube, water jacket, levelling bulb and heavy metal bases. A special feature of this burette is the four-way stopcock which permits a permanent connection with the potash pipette, thus obviating the necessity of repeatedly connecting and disconnecting the pipette ditrinpy Hhercourseloiankanalysiss need eee cee eee eee eect cee LOU 251 No. 29544 No. 29556 No. 29564 No. 29568 29540. Gas Cylinder, Low Pressure, Empty, of steel, riveted and brazed, tested to 600 lbs. pressure to the square inch; with stopcock and coupling. These cylinders are for sale and are returnable for re-filling but not for credit. Ree RAR ae 10x32 13x 44 Soe eee 25 50 29544. Gas Cylinder, High Pressure, Empty, of seamless steel 53 inches in diameter by 51 inches high. Each Chief Inspector of the Bureau for the Safe Transportation of Explosives and other Dangerous Articles. These cylinders are sold outright only and are not returnable for credit........ 15.00 29548. Gas Cylinder of Carbon Dioxide, consisting of high pressure cylinder No. 29544 filled with 20 lbs. of Carbon Dioxide as used in connection with freezing microtomes and other laboratory purposes. Cylinders are returnable for re-filling only and not for credit..................2.2.+2220-- 18. 29552. Gas Cylinder of Oxygen, consisting of high pressure cylinder No. 29544 filled with 70 cubic feet of 99% pure electrolytic Oxygen (under 1800 lbs. at 68°F). Oxygen is absolutely free from the oxides of carbon, hydrocarbons and other deleterious impurities. As used in calorimetry, carbon com- bustions in steel analysis, ete. Cylinders returned for refilling only not for credit....... 17.80 29556. Gas Cylinders of Oxygen. These cylinders are filled with the indicated quantities of 97% pure Oxygen (S. S. White Dental Mfg. Co.) at 1000 lbs. pressure. These cylinders are only sold filled with Oxygen but are returnable when empty for either re-filling or credit at the prices indicated. Capacity; gallons: ces cscietassrcteiera. 8 » faye == ellen eee eh Gee eres ie EE) 100 Rach; fillediwithtOxy gentry: ccs oc rete eee eerie 8.15 17.00 Cylinders returnable for credit at (charges prepaid). 6.00 12.00 29557. Set of connections, for above cylinders. |. .2...5202 22.0.2 oe eae ae eee 1.75 29560. Throttle Contro! Valve, for the safe and accurate delivery of small quantities of gas from cylinders as required in the use of carbon dioxide in connection with freezing microtomes and in the delivery of oxygen in calorimetry and carbon combustions in steel analysis...................+22+ 7.50 29564. Gas Pressure Regulator, for maintaining a constant pressure of oxygen when delivered from pressure cylinders. These regulators will deliver oxygen or other gas uniformly at any desired pressure up to 40 Ibs. per square inch. One of the dials shows the pressure at which the oxygen is deliv- ered while the other shows the pressure remaining in the tank 30.00 29568. ‘Iron’ Support; for hich pressure @ylinder No. 29544. «9... 02. eects cen le ee eee eee eee 4.00 Note.—We undertake the refilling of Oxygen Cylinders No. 29556 with S. S. White Dental Mfg. Co. Oxygen at their original prices, i.e. 40 gallon cylinders at 53¢ per gallon and 100 gallon cylinders at 5¢ per gallon. We fill high pressure cylinders with 99% electrolytic Oxygen at 54¢ per cubic foot with the addition of all transportation and hauling charges which may be necessary. We also fill high pressure cylinders No. 29544 with 20 lbs. of Carbon Dioxide at $3.00 per cylinder, with transportation and hauling charges added. Low pressure cylinders are best filled with Oxygen and Illuminating Gas for calcium lights at nearest supply establishment for gases of this character. The usual charge in large cities is $3.00 for filling 25 gallon cylinders and $5.00 for filling 50 gallon cylinders with Oxygen, and $.50 and $1.00, respectively, for the same cylinders filled with illuminating gas. We undertake such filling as an accommodation for our customers when necessary, but without responsibility on our part. 252 29572. 29576. 29592. 29596. 29600. 29604. 29608. No. 29584 No. 29596 Gas Generator, Kipp, improved form, for the continuous production of hydrogen sulphide; with large side opening for filling. Complete with Geissler stopcock, funnel tube, ‘ete. Wapaclby icc sacs ccmcwiae Heislsecieniinae sels 250 500 — 1000_ 1500. 2000. ——-4000 LITT | Wee Renee eee Seat Baer etets 3.50 4.00 5.00 6.00 7.00 9.00 Rubber Rings, for use in the above generator to prevent the iron sulphide from falling into the lower chamber. PROM Fitl FCTMOT ALON CC se sracete ey afore aystss coors wieieiosore, seis) 2 sisisjaie sleyeleterele 250 500 _—_—+1000 2000 DEVO 0.38 ob Sonpubec acco sao CON OC eaUOE ded IOC nem ACAD oE soc 30 35 45 -60 Gas Generator, McCoy. A steady gas pressure is maintained by delivering the acid in drops. (CE EVO TINA Wenn eeaccood fei 6 donnie aiOtoreree CnaeEE eG cna en acbrooceoceedoooDoS. 1000_ 2000 LY Toe a anoooctie 0 Or Con CO OU TR DEOS OT antic ie annem errs ich, Friacnorrcn moron 8.00 10.00 Gasoline Gas Generator, for operating one Bunsen burner or one blast burner in laboratories without gas supply. Must be used in connection with a foot blower or other form of blast apparatus. Dimensions 44 inches diameter by 7 inches high and contains 14 lineal feet of evaporating sur- TEC s5 cpa cod a oie6 U OOOO OTOH DOT EIN Hb Oo CITC OEE nS ACERS Bon oe anon Sorin saa shone ee tere coreee 9.00 Gas Holders, Berzelius-Pepy’s improved form, of heavy copper, with glass gauge. WADACIEYWILbETS sacri cree ele era ae roie asls oo 7 siwis ia aleisie ls evereheisiase victis Ta OOS mela ears 20 40 DG No ad don. Stns Og6 dad bos G6 VART COMt Gat IDRC TERE BORE rr Cttaci Skatinie Fron rine 20.00 25.00 Gas Holder, Berzelius, entirely of glass with ground fittings; CADACIEY SiLIterses eee eee 16.00 Gas Generator, Tirrill, for generating gasoline gas for use in laboratories. This machine accomplishes the mixing outside and is permitted by all fire underwriters without extra cost. The gas delivered gives a white, absolutely smokeless flame without odor. It is composed of a generator placed in the ground 30 ft. from the building and buried 6 ft. under ground, a mixer placed near the generator 3 ft. under ground and an air pump placed in the cellar of the building. The machine can be operated by either weight or water. The above illustration shows the machine operated by weight. Any plumber or gas fitter can set the same up with the directions supplied. Nim berio fe burners sect cierte cele neers~ «i= 15 25 500 75 100 DOE (oo Ur end Oe DOE OSoO MoASIRC ICC ona arn 210.00 250.00 210.00 410.00 525.00 Gas Measuring Tubes, of glass, graduated, closed at one end, without stopcock. Capacity s eran eee eek eae eecle isin: 25 ee in A,ths 50ceinyoths _—*100 ce in tths DE hep onarnn G5 ODDS Oe ee EenERa o CoeneeEtmee 65 1.00 1.50 Gas Measuring Tubes, same as No. 29600 but with stopcock. Cen Gin ao AS oS on Jodtdcs UlMLg Go Canoe REC mEenc sor ananmraca te 25 ec in yoths — 50 ce in zoths ESR CIV tes sense ralatatcs avers ie eieye Siaie tases, 03 Sidi she isi + oiiele Oasys slokeen sists srelacerom ees 1.50 2.00 Gas Palladium Tube, Hempel, for the absorption of hydrogen, with about 2 grams of palladium sponge. 5.00 253 No. 29612 No. 29616 No. 29624 29612. Gas Distributors, of brass, with one supply pipe and three burner connections with stopcocks.. 4.00 29616. Gas Distributors, of brass, same as No. 29612 but with burner in center..................... .. 4.75 29620. - SS “with gas supply pipe and four burner connections, with stopcocks... 4.75 29624. 3 ss +“ same as No: 29620 but with burner in center............ 1. see eee OLUU Eee ereneeeenen aS No. 29636 No. 29632 29628. Gas Filter, for use with either the Greenman or the Roux Bimetallic Thermo-regulators, to clean the gas of coal tar or other impurities, thereby securing more satisfactory working of the regula- V0) nccoe obo Sa ROD a eOnUMa On DeeamiaGrr es aaomns dane aboenna bo cdtaccenhonéedGoosccecce- ee. 5.00 29632. Gas Filter Tube, with projections to support paper thimble and ground in connecting tube. The upper connecting tube is 1 inch in diameter; without thimble...................0++ee+eeuceeseess H 29636. Gas Generator, ‘‘Autogenor,”’ for generating oxygen, automatically producing an absolutely pure oxygen from\oxone\at any; desired pressure up) to/50)Ibs.. ...2.55. 02 do oo. see eee . 45. Oxone Cartridges, in tins each containing six round tablets, sufficient for 42 cu. ft. of oxygen, Per' cartridge... .. s.cea cs chin ahens der scue a vite iel yee nee 1.35 29648. Gas Generator, Electrolytic Oxygen and Hydrogen. By means of pure nickel electrodes and the use of 30% caustic soda solution as electrolyte, pure oxygen and hydrogen are generated in turn by reversing the poles of the battery, The oxygen is very pure, being particularly free from ozone. Height7 em by 15 em in diameter. See Zeit- schrift fiir den physikalischen und chemischen Unterricht (Poske) XXV.I. p. 69. Duty Free... ...oiocec.-:serroerecwinge eee eee 11.55 Duty Paid 254 29672. No. 29652 No. 29668 No. 29672 Cubic Foot Bottle, immersion type, standardized by the U. S. Bureau of Standards. This instrument is the basis of all gas measurements; operating on the principle of displacing 1 cu. ft. of gas by a volume of 1 cu. ft. of water........ epee TA air A nics odoap ODS oCHACOpOTaDaG 125.00 Gubic Root bottle; asi above cabinet formes. se aceia cee ale rete eee erratic eter ieistelai sis 275.00 £ rs «3, on wooden stand, for testing the correction of the registration of gas meters, particularly the wet test meters as used for experimental purposes........-...--..------5 55.00 Grubic Root Bottles fstab Ove pC tate yey pote =n. -ctavates hei arauayelajerorete sielepatate = eietaColsekersledeparheteFe)at-tsetatpiatanere 55.00 the #5 circle. This rate circle reads from 0 to 6 ft. per hour. Complete with water gauge, ther- mometer, spirit level and levelling screws .............----.se sence settee terete eens 50.00 Gas Meter, a photometer wet test meter, with a ; cu. ft. drum and an hourly rate dial reading from 0 to 5 cu. ft. per hour. This is the meter mostly used in photometrical work. The meter makes one revolution of the drum per minute in accordance with the legal rate at which gas should be burned in ascertaining its candle power, i-e., 5 cuft. per hour. With water gauge, thermometer, two spirit levels and levelling screws........... 2.20.2. eee cece ence cence eee certs ecenenes 50.00 bo or or > ns) 4 brs G D a0 4 Se fo) = > Ww (@) ° = uU > Z < HOD ARMT MN N=) No. 29692 AEB iwidwe.*) 000 iam ;_—___—___—___—__* _—_—_____7j MATT ADT No. 29700 == = No. 29684—Larger Size No. 29684—Smaller Size No. 29716 29676. Harcourt Pentane Lamp, model adopted as standard by the London Gas Referees with improvements as suggested by the U. S. Bureau of Standards: /3.)..:..0.-.-.----..-+-- Ses 75.00 29680. Harcourt Pentane Lamp, as above, with certificate of the Bureau of Standards................. 87.50 29684. Gas Meter, ‘‘Rotameter,’’ an accurate instrument for showing instantaneously with direct reading the volume of gas or liquid passed through it per hour. In ordering it is important to state the kind of gas to be measured, the maximum and minimum capacity in liters per hour, the pres- sure at which measurement is to be made, the diameter of the inlet and outlet tubes to which the Rotamesser is to be connected and the temperature of the gas or liquid to be measured. Capacity, iterssperhour: -.--..........-<-: -05-10 1-20 1-50 | ___2-100 Duty Pree eescr rere eee oases swiss 75.00 66.00 45.00 37.50 Duty; Paid en ee eines. cas sees 100.00 88.00 60.00 50.00 Capacity, liters per/hour............-.---- 10-200 30-300 50-500 _ 100-1000 DutyiRreess Se a eretcee ce stelacis ies nieicsierste 31.50 34.50 39.00 51.00 Diity Paid eects be states tielaia's 42.00 46.00 52.00 68.00 29692. Gas Regulator, for shutting off the supply of gas at any desired time, consisting of a specially con- structed clock with timing device and gas valve. The gas valve is connected by rubber tubing between the gas supply and the apparatus which it is to regulate.....................-... : 29696. Specific Gravity Apparatus, Schilling, for illuminating gas.................. 2c eee e cece eee eee ee 18.00 29700. Gas Pipette, Hempel-Friedrichs, simple absorption, of reddish brown glass. See Zeitschrift fir angew. Chemie, 1912. ‘On:metal' stand cn. «ccc 5 Sed. ota cee et citron eb selon cee eee ee 4.50 29704. Glass Parts) only for No: 29700 svete cm cleieie vine «olen ieee eee see eee 3.00 29708. Gas Pipette, Winkler, for the determination of methane. On iron support, with platinum spiral.. 7.50 29712. Glass Parts, only, with platinum’ spirals. 2.0.2... 22 cnc... cone «+ wince een ieee 6.00 29716. Gas Pipette, Double Absorption for Cuprous Chloride, Standard U.G.I. Form. This pipette was designed to replace the two double absorption pipettes otherwise necessary in making a gas analysis. By simply turning the cock it is possible to bring the gas in contact with the absorbent contained in either side of the pipette without disconnecting..... ........ ...... oe as va see 10.50 29720. GlassiParts only, for above menses cctielsierieieieiceeeleinaaiele @ 016 sisleielnlnitie aloe ctclele eioioe ieee 7.50 256 No. 29724 No. 29732 No. 29740 GAS PIPETTES, HEMPEL, mounted on improved iron supports with lacquered base. The glass parts are fas- tened to the supports by means of adjustable metallic clamps with cork inset. The adjustment permits of the use of glass parts of slightly varying dimensions. To avoid breakage iron supports and glass pipette are packed separately and must be set up in the laboratory. Gas Pipette, Hempel, simple absorption, for liquid reagents, on new form iron stand............ 3.00 G@ibgs LOntiS Onalky nap INI@s ZR Sa scovonooeeus abodcodcnodncoouadoouons du Heeeocaacoos0anDOENS 1.25 Glass Pipette, Hempel, simple absorption, for liquid and solid reagents, on new form iron stand.. 3.00 GlassiPartsronlysforsNow20 (o2se cen ae eect ce eee eer cic oe sales lp ataleteieloleiferie 1.50 Gas Pipette, Hempel, compound absorption, for liquid reagents, on new iron stand.. Ire eon 14000 Glass Parts only for No. 29740. No. 29748 No. 29756 Gas Pipette, Hempel, compound absorption, for Hauid's and solid reagents, on new iron stand .... 4.00 Glass Parts only for No. 29748. wera taiatolasesc ovaysiausye (el cua cists sieves, SeeO Gas Pipette, Hempel, for the preparation. of hy drogen, on new iron stand Glass)Pantslonlysfore Nios 29756 nee ita cielo) oleletstoteretelede laity , Gas Pipette, Hempel, with glass beads for ethylene absorption fame Glass Parts only for No. 29764........ anton Se No. 29772 I "No. 29780 Gas Pipette, Hempel, simple explosion, with stopcock and platinum electrodes.................45 6.00 (GSS LEAS Oily tie INO, PE0Pien s50no ho 25 Uacodano nso eopycorencodnnbed sanasdoDasogaDoOae SHE 3.50 Gas Pipette, Hempel, explosion, with platinum electrodes, stopcock and levelling bulb.. . 7.00 GIRS TEST ECHIhy rio ING, ZOO) Aagone spo sdsosscoodnonoccocesnagcoe. Bes ... 4.25 Gas Pipette, Hempel, with platinum spiral, for methane, mounted on new iron stand............ 6.00 257 1 9 ¢ BROWNL SHARPE PROVIDENCE.R-E 29796 No. No. 29832 No. 29804 No. 29820 No.*29836 No. 29840 No. 29828 29792. | Gauge, Pressure, in brass case, reading in pounds. Suitable for steam, water or air pressure but when used with steam pressure must “alw ays be connected with syphon. May be graduated to any pressure not exceeding 500 lbs. Range must be specified i in ordering. The 3 inch gauge connects on } inch pipe thread and 5 inch gauge connects on { inch pipe thread. ID Wea arey hao aegdomaoddocaooscocosn apoE nosdesabHococeetocusaronetcosales: a = DEVS th. cnond ne pepe Sennen ae coomamogn oo dposKuaddos Osun cdomesaccacbesecadredcic:: 5.00 29796. | Gauge, Vacuum, reading in inches to 30 inches of mercury. Otherwise similar to No. 29792. Dial 3 3 inches in diameter.«.....c.:2 0s scheeed bac en OR oe oe ee 5.00 29800. Gauge, Vacuum and Pressure, both on same dial, vacuum scale for 0 to 30 inches of mercury, pressure scale from 0 to 15, 30 or 60 lbs. Range must be specified in ordering. Exactly the same in con- struction as*Nos: 29792 and 2979625... .6.<6. css oes sect mi eaten le seins ole eee 14.00 29804. Gauges, Wire, American Standard, B & §, of best tempered steel. TER ren te Oe ee oon bode OO OS Shc crichockac cca st _0 Ee 36 5 to 36 1 Ea Ree ee Se ir roo Yon Sitn ts Gir mticcic c.o2-2 2.50 2.00 29808. Glass Beads, solid, 3 to 6 mm in diameter. Per Ib...................... ae edb anole Men seeee eee -90 29812. w Ke hollow, 5 to 6 mm long by 4 to 5 mm in diameter. Per Ib..................-.....-- -70 29816. Glass Cutter, Diamond. Price depends upon quality of splint and varies from $5.00 to $20.00. 29820. G with small steel wheel... -. 2-2-3052 emr cece eee oe = ee eee -20 29824. “Tubing Cutter. Large size will cut tubing of 3 to 1 inch in diameter in lengths up to 8 inches; small size will cut tubing 2 2 inch diameter in lengths up to 5 inches. SIZE. nee Re are Hera Shellie a3 e@a aes ale ese eee EE ee ee Eee Small Large 100 RE ee ens GOS Ee eae eRe SAO cscUnenmeGanaseStancace 1.50 1.50 29825. Extra cutter wheels. Per dozens. ss. eee oD asiete eee ee 2.00 29828. Glass Tubing Cutter, Griffin’s form. Mor tubessamm iy Ai ame cer snes a1 ayer ccsisi= ve) ©3mm F H U R OH. - TR He OF Mi UAtmSu=nnClnO tI e nnn = = = co = Tp} = spt: 5.32 . = = SS ee ba o 2 Ei Bis: Seis SE vt x \ Ex 7 eo OOO © No. 29864 @2mm @©3mm @Qamm Oo )10OMM @: a No. 29864 No. 29868 No. 29872 GLASS TUBING AND ROD is carried in stock in the original factory lengths of from 1} to 2 meters. Customers 29856. 29860. 29864. 29868. 29872. 29876. 29880. 29884. 29888. 29892. 29896. 29900. 29904. 29908. are requested to state the length to which pieces may be cut for shipment. On small orders, particu- larly where factory length is not required, an extra charge is made for the special box required to insure safe transit. The following prices are based on tubing with usual factory variations as to bore, thick- ness of wall, ete. Where tubing must be selected to an exact measurement as to inside and outside diameter, an extra charge is made. Specifications as to diameter of glass tubing are always taken to be outside diameter unless otherwise stated, except in the case of combustion tubing where it is cus- tomary to specify inside diameter in order to make sure same will take proper size combustion boat. Glass Rod, for easy manipulation before the lamp. From 1 to 25 mm diameter. Per Ib......-.- 40 Glass Stirrers, with one end rounded and the other end pointed. hengthysimehessaecscs) jose. 4 5 8 10 12 15 Diameter, inches............ t 3 3 vs + Ls Rer/dozen' sesh eee es -20 25 30 40 -60 1.00 1.15 Glass Bending Tubing, Best Imported. Particularly recommended for laboratory use because of the ease with which it can be manipulated before the lamp. Not to be confused with low priced, thin walled “‘vial’’ tubing of either German or American make. Outsidediameteremmtreas 07. oho oo lto4_ 5 to 20 21to35 36 t0 50 LP see owed ob Se One ROR RGRDC nee case ncote 45 -40 50 -60 Glass Tubing, Barometer, in three outside diameters, i. e., 6, 8 and 10 mm. Per lb............ .70 Glass Tubing, Capillary, with very small outside diameters, i. e., approximately 2, 3,4and5mm. The 2 mm tubing has a capillary fine enough to be designated as thermometer tubing. The tubing of 3, 4 and 5 mm outside diameter has a bore of about 1 mm and differs from barometer tubing only in‘the outsideidiameter: “Per Ib..... .. 5cosas00 acdsee econ eee eee 1.00 Glass Tubing Combustion, Kavalier Hard Bohemian. Dimensions given are inside dimensions in order to determine size suitable for various combustion boats. Inside‘ diameter vm Grecian s fesyess So ands ores oe ee Ota Cee 3to$ 9-25 1X2 cal | We Ana ce a We . |. .n 1.10 1.00 Glass Tubing, Jena, Combustion, containing very little alkali. Very tractable in the blowpipe flame although as hard to fuse as the hardest Bohemian. Inside diameter, mm.. 3 to05 6 to 25 150d LR ee as Go ch nS he ae ee eerie aden Semenoeadadsen « 1.00 td Glass Tubing, Jena Apparatus Glass, adapted for work before the lamp in the manufacture of appa- ratus./ Outsidediameter > townpmm. Perlb: 2... 200.4. 0 3 eee 1.00 Glass Tubing, Jena Compound Robax Glass (registered trade-mark a light blue longtitudinal line) for explosion furnaces, etc. Of great resistance to sudden temperature change, the action of water, acid or alkali solutions, ete. Outside diameter 12 to 25mm. Per Ib................ 75 Glass Tubing, Jena Uviol Glass, of high transparency to ultra-violet rays and very thin wall. Im- ported to order only. Duty Free, per kilo.......... 3.50 Duty Paid, per kilo......... 7.00 Glass Tubing, Jena 39701 Glass, adapted for the enclosure of platinum wire, so-called fusing-in glass: (Outside diameter 5 to 12imm:. ‘Per'kilo...>-200.2-- 5. 24.2 eee nee 1.00 Glass Tubing, Jena Fiolax Glass, made especially for the manufacture of ampoules and other con- tainers for sterilized solutions. Very resistant to alkalies under sterilization and at the same time easy to manipulate before the lamp. Trade-mark for white tubing a red line and for amber a white line. A very valuable tubing for laboratory work because of its resistance to alkalies. Outside diameter 10\to 185mm. [Per kilo!... 0.0... 7... .. cee ee nen eee 2.50 Glass Tubing, Thermometer, Jena 16UI Glass, of great resistance power, almost entirely eliminating the periodical changes of the zero point. Registered trade-mark red longitudinal line with white background. About 5 to 6 mm outside diameter. Per lb...................++-+-+-- 1.75 Glass Tubing, Thermometer, Jena Borosilicate 591 Glass, with white background with lowest possible temperature coefficient, i. e., 1° C. = .0000177._ For the manufacture of thermometers to measure high temperatures, i. e., up to 500°C. About 5 to 6 mm outside diameter. Perlb......... 2.75 Ao Re osha Ut RR Ely. im Hy -O} (Me Ay -S CEO! 9M. IRs AS UND 29904. Glass Tubing, Thermometer, Thiiringian make, with white background. About 5 to 6 mm outside diameter. Per lb. APR ERE ae Pe poe enae .. 1.00 29908. Glass Wool, of best Bohemian spun glass. In original cartons. Quality os: ---o.-: A (wavy, coarsespun) FF (wavy, finespun) B(smooth, free from lead Per 25 gram carton... 40 40 40 lOO 4° - 1.25 1.25 1.25 500“ r 5.00 6.00 4.25 (a No.29916 No. 29948 No. 29932 No. 29936 No. 29928 No. 29944 No. 29920 No. 29924 29912. Glue Testing Apparatus, Weiss (Consistency Meter) for measuring the consistency of rubber, sugar, sugar solutions, glue, gelatine, fats, oils, etc. The time of rotation of a horizontal dise under the impulse of a fixed weight is measured on the circular dial...................... 200.00 29916. Glue and Gelatine Tester, Alexander, of brass, with electric annunciator. See Journal of the Society of Chemical Industry, Feb. 28, 1906 ...........0...... : ; Be G8 .... 26.00 29920. Glue Viscosity Pipette, Alexander, with tripod, metal jac ket, ete..._.. ee O0 29924. Glue Tester, Scott, for testing the tensile strength of glue, gelatine, etc., ‘and for. m: aking comparative tests of the hardness of greases, wax, etc., reading in "pounds and fractions of ounces automati- eally. SESE ARE ares A eee, Men SEC oo sais .. 25.00 29928. Goggles, gas t tight and indestructible, with rubber fittings and removable, clear glass lenses 1.50 29932. Graduates: Glass, of ordinary accuracy, graduated in ounces. Capacity, ounces : 7G = 4 6 8 16 32 Each.. AS os 28 35 40 70 1.20 29936. Sreauatee: Glass, of ordin: ary accuracy, graduated in cubic centimeters. @apacity, ce.-.... Waa acer 30 60 120 250 500 1000 ACH ee eee os eee 20 29 a is) 00 .80 1.40 29940. Graduates, Glass, of ordin: iry accuracy, oradu: ited in ounces and cubic centimeters. Capacity, ounces 1 2 t 6 8 16 32 se ee 30 60 129 150 250 500 1000 Bachsen eer 32 35 50 -60 .75 1.10 2.00 Dajs4 ea raduates| Glass-sioiicc.capacity, eraduated in Ce. <--/ 12sec «secre eects sole ciel eaeisienel ole 1.25 29948. Graduate, with graduated stem, as use >d in moisture testing in aod th: at has been c reosoted, etc. Stem is graduated to 12 ce in jyths. See Bulletin No. 134 of the U. S. Department of Agriculture, Forest Service . : : ARAL AER iG do ee aonss aeNcha satrerate arate 1.20 261 sy A aa \ crn rrernes Pat alt ltl oi eo erere eceec\ Heecce erecece Vege NAET AAMT i a RRS Sa eer rerererrne M bia eeeeeree lara. rrr eee er er GEL SAE, No. 29956 No. 29960 29952. Graduates, Aseptic Enamel Ware, of seamless steel, white enameled, both acid and fire proof; gradu- ated in cubic centimeters on the inside Capacity, ce Dit 900 1000 2000 4000 Each........ ae 1.00 1.25 1.75 3.00 29956. Grain Germinator, Schonjahn, with thermometer; as used in determining the germinating power of barley, ete., in malting. For 100 grains _ 4.00 29960. Grain Tester, Grobecker, of brass, for sectioning 50 grains = 0-00 APPARATUS FOR HAEMATOLOGY Diagrams Showing the most used Haemacytometer Rulings _ a Thoma Ruling Neubauer Ruling Zappert Ruling aa,hHHttz C.ZEISS, JENA i C.ZEISS, JENA C.ZEISS, JENA Breuer Ruling Fuchs and Rosenthal Ruling Tirk Ruling 262 No. 30068 C.ZEISS, JENA Biirker No. 1 Ruling No. 30088 HAEMACYTOMETERS, ZEISS. We particularly emphasize the adv antage of using the original Zeiss make 30000. 30004. 30008. 30012. 30016. 30020. 30024. 30028. 30032. 30036. 30040. 30044. 30048. 30056. 30060. 30064. 30068. 30072. 30076. 30080. 30084. of Thoma Haemacytometers and all modifications thereof; our experience having shown that the cheaper makes are inferior and never satisfactory as to accuracy. Our stock of Haemacytometers, with the exception of the Hayem-Sahli and the Thoma-Metz, is confined entirely to the Zeiss product. The counting chambers when sold separately are supplied without leather case but with one each thick and thin cover glasses. They are all of .1 mm depth, excepting the Helber and Fuchs-Rosenthal. The vari- ous rulings : are shown in illustrations on preceding page. Counting Chamber, Thoma ruling, with two cover glasses but without case..................... 4.50 ef fe Zappert <“ cc ae oe Ke se « ET Oh aiear cena oe yee ae 4.70 “ “ce Tirk “ “ “ee “cc “ “ “ Ll Sea 6 30 “oe “ce Breuer a“ “ “ce “ “ “ “ Ce eat hee 5. 60 s§ ss Biirker No. 1 ruling. The chamber is provided with two counting surfaces sepa- rated by a cross chi: annel so that two countings can be done one shortly after the other. The rectangular cover glass is placed in position before introducing the blood mixture, the drops are placed upon the semicircular prominence of the middle plate and flow from thence by capil- lary attraction upon the counting surfaces. With cross lines divided on both counting sur- RCO ati ccocts odaa 8 ben ne fe rn it Rr 4 in be ee 7.40 Counting Chamber, Biirker No. 1 ruling, but with spring clamps to hold cover glass in position.. 11.00 Counting Chamber, Biirker No. 2, the counting surfaces of which are not provided with cross line divisions. Counting is done by means of special ocular diaphragms; the value of the square aperture of these diaphragms can be estimated by the stage micrometer (1 mm divided into 100 parts) cemented alongside the counting chamber. With three ocular diaphragms.......... 8.85 Counting Chamber, Biirker No. 2 ruling but with spring clamps to hold cover glass in position. .... 11.70 Counting Chamber, Special, with two counting surfaces as in the Birker No. 1 but with the surfaces ruled with the Neubauer ruling. As made specially for us by Zeiss and as used in the Clinical Laboratory at Johns Hopkins University Medical School. . TEMA RNs: cranes stains ele 11.70 Counting Chamber, Helber, for counting blood platelettes, yeast cells, Bact Grae) etc. With Thoma ruling but with counting cell 0.02 mm in depth instead of 0.lmm...................0...0200-. 4.85 Counting Chamber, Fuchs and Rosenthal, for cytological investigations of the cerebro-spinal fluids, Tan COMMA Vil ore (Dey. Pe ee ASE peers cecorc ae cnoancdce sr aranmeananes 4.70 Leather Cases, of morocco, velvet lined, for any of the yet counting chambers:..j..;:.2:..--...-.<- 55 Cover Glasses, for above counting chambers, square 0.4 mm thick............. ot ate Redes dite -20 Biirker counting che ambers, rect angul: ir, 0.3 mm thick.. MAS ECA ae a 25 ne “ & ss Oz Semmes ne avo Ss 7 erent ee Soccer Seis 5) Mixing Pipette, Thoma, for red corpuscles, diluting 1 to 100; with rubber tube and mouth piec ess 1.80 “for white corpuseles, diluting 1 to 10; with rubber tube and mouth piece. 1.80 of iS Rieder, for diluting 1 to 20; with rubber tube and mouth piece. : CEI ss ae Miescher, for diluting 1 to 100, 1 to 150 and 1 to 200; with rubber tube and mouth piece 4.30 cs a = for diluting 1 to 200, 1 to 300 and 1 to 400, with rubber tube and mouth piece 4. a Fluid Chamber, Biirker, for use on Biirker’s counting chambers.....................00-0ceeeeeeees 30088. 30092. 30096. 30100. 30104. 30108. 30112. 30116. 30120. 30124. 30128. 30132. 30136. 30140. iT Ho aU aR late iH 20) @Ma vA es G, 30) 3M) BPs AS MING BY: With two pipettes With one pipette red and white red or white Haemacytometer, Thoma, complete with leather case and pipettes... 9.75 7.75 us Zappert as ¥ ss ss eS : 9.90 7.90 ss Tiirk vs: a FS a a : 11.50 9.50 eh Breuer - ss ss ie . a 23.60 21.30 Birkerl “* ss cs “y < coe 12.60 10.60 Birkerl “* ue cs e G: *€ with clamps 16.20 14.25 Birrker2 “ a s fs “ Se eae 13.90 12.10 Biirker 2 ay ss of 2 os ** with clamps 16.90 14.95 Special Biirker-Neubauer “ as ss ce < hy 16.90 14.95 Note—For counting with Biirker No. 2 chamber wifhout rulings, and in fact with all the counting cham- bers, it is sometimes convenient to use the seven square diaphragms after Ehrlich and the Ocular Net Micrometer Nos. 30132 and 30144, both of which are best used with the Adjustable Oculars with focussing eye lens No. 30140. No. 30124 Haemacytometer Outfit, Biirker, for red corpuscles, consisting of Biirker No. 1 counting chamber with clamps, Birker fluid chamber, 2 mixing flasks 125 ce capacity, 1 diluting pipette 4975 cmm, 2 transfer pipettes and 1 blood lancet. Complete in case with directions for use and 100 diagrams for tabulating results. See K. Burker, Pfliiger’s Arch. f. d. ges., Physiol., 142 387 ff, 1911.. 23.75 Haemacytometer, Hayem-Sahli, complete in case, consisting of the following, Eyepiece III with sliding eye lens and screw-in Hayem counter, including tables; object slide with chamber 0.2 mm deep, without ruling, but with reference square of 0.2 mm side ruled on the floor of the chamber and surrounded by concentric orientation circles; object slide with chamber 0.1 mm deep, with refer- ence square of 0.2 mm side surrounded by concentric orientation circles and, in addition, a microm- eter scale, i. e., 1 mm divided into 100 parts, 2 pipettes for the diluent of 250-500 ce capacity, one red and the other white, pipette of 1-5 cc capacity, for red corpuscles; pipette of 5-25 ec capacity for white corpuscles; two mixing cells with stoppers, one marked ‘‘red’’ and the other “‘white;”’ two thick and two thin plane, parallel cover glasses and one stirringspatulum..............-. 22.00 Ocular Net Micrometer, Zeiss, consisting of a square of 5 mm divided into small squares of 0.5 mm.. 1.55 Ocular Diaphragms, Ehrlich, Zeiss, with square openings of 1 mm, 2 mm, 3 mm, 4 mm, 6mm,8 mm and 9mm. Convenient to place on the diaphragm of any regular Huyghenian Oculars........ 3.10 Oculars, Adjustable, Zeiss, particularly recommended for use with the various ocular micrometers in that the eye lens may be focussed sharply upon the micrometer when resting on the dia- phragm Designation. ‘ ‘ K.6 H.2 Hes H.4 Duty Free..... 6.25 2.75 2.15 2.75 Duty Paid : 7.75 3.40 3.40 3.40 eae 7 Te No. 30144 Thoma=Metz Blood Counting A pparatus SSS No. 30156 No. 30148 30152. 30156. 30160. 30164. 30168. 30172. 30176. No. 30160 No. 30176 Ocular, Ehrlich, with adjustable square diaphragm for use in blood counting, cytology, ete........ 11.40 Haemacytometer, Thoma-Metz, consisting of a counting ocular, counting slide, plano cover glass, pipette for red corpuscles and pipette for white corpuscles. The usual graduations on the counting cham- ber are omitted and are provided in the ocular which is adjusted for use with a 4mm objective. Small variations in the focus of the objective may be compensated for by adjustment of tube length. This adjustment is controlled by the coincidence of the counting plate with a square engraved on the slide, Im case. 3... 6.0... - ce. eee certs e eee onsen ; eer 600 Haemaglobinometer, Dare, complete in leather case. . 22.50 TODSLOTMUSE Bete nae es ese aharahtate oy otehe Racer aeues : ae : soe UBD Standard Colored Tubes for above, each.................... myc Beene Maw : Soacnles Graduated Tubes for above...... 1 Seka/al teeleheYe ete 5 SO PaE i Soa Ses enone eed tee Ragines ee) Graduated Pipette for above ET Nari eel oes etre ae ne Oe AD Raper acct ie2b [ ih ‘oO LH 9) No. 30200 30180. 30184. 30188. 30192. 30196. 30200. 30204. 30208. 30212. 30216. 30220. 30224. No. 30180 No. 30196 Haemometer, Fleischl-Miescher, for estimating the absolute as well as the relative percentage of haema- globin content of blood with great accuracy. Complete with cells, mixing pipette, etc. 45.00 Capillary Tubes for Fleisch! Haemometers of varying capacities to suit wedge of instrument. Capacity in cubic millimeters. Each.. -30 Yellow glass disc, for use with Fleischl haemometers in daylight. Each........................... 1.75 Coagulometer, Biffi-Brooks. Complete with thermometer........................-. 20.22 2e5000s 8.00 Coagulometer, Brodie-Russell-Boggs, for use on the stage of the microscope. See Johns Hopkins Hos- pital Bulletin, June-July 190 a ace cma ciel crls eee eta meee ieee etic tate ae 9.00 Coagulometer, Schultz, consisting of small glass tubes each with 14 bulbs, which may be broken off readily with the fingers for introduction into the normal salt solution A simple and convenient method for determining coagulation time of blood. See Berliner klin. Wochenschr., 1910, No. ew Rach) 22 «fe ache% = Set teats nies ee nuts Mewar Bes err asa e tn acerca eee -20 Wt. No. 30204 No. 30224 Apparatus for the Determination of Urea in the Blood, Marshall. Complete outfit as shown in the illus- tration consists of two calcium chloride tubes, two Erlenmeyer flasks, two cylinders, one gas washing bottle, two rubber stoppers to fit cylinders, one Chapman filter pump, three special Folin tubes with perforations in bulb, three glass bulb connecting tubes, tubes for connecting flasks and tubes to reach to the bottom of the cylinders with necessary hose, ete. See Journal of Biological Chemistry, Vol. XV, No. 3, September, 1913. Complete outfit................. 7.00 Folin’ Lube with perforated!bulb, for'above; each.:-...-.....2.02-22+t sos ss eee eee 15 Bulb Connecting Tube, for above, each......... Fp ds Giejeicleys sual cae iehshe cee ale oan a ee 30 Connecting Tubes, short, for connecting flasks, for above, each.................... 2000 eeeeeeee -10 o se sarees 18.00 30280. 30284. 30288. 30296. No. 30280 No. 30296—With top removed, showing replaceable heating units Hardness Tester, Brinell, for use in making Brinell’s ball impression test or Ludwik’s test by conical impressions. This method is st: andard throughout the world and gives numerical values of the hardness of materials without elaborate preparation, and insofar as iron and steel are concerned, the tensile strength as well. Some of the applications of this instrument are as follows:— Rapid control of chemical carbon determinations during iron and steel smelting. Testing finished articles without damaging the same, say rails, tires, projectiles, armor plates, gun barrels of all kinds, structural steel, etc. Examining the nature of the material in entire or broken parts of machinery, where the making of a tensile test bar is impossible. Testing the degree of hardness and softness obtainable by thermal treatment of any steel. Testing uniformity of temper. Ascertaining the effect of the nature and temperature of various hardening fluids. Studying the effect of cold working, etc., etc. For a maximum pressure of 3000 kilograms. Duty Pree sy eee ake 210.00 Duty: Paid: 2 :5:,... 7.2 250.00 Hardness Tester, Brinell, as above, for a maximum pressure of 5000 kilograms. Duty Bree :s)2.3,34.cb ose seen oes 235.00 Duty, Paid y...53054.5.45.05 eee 280.00 Hot Plates, for gas, with extra heavy polished’ steel top. Length, inches..... soins sane ceies = ; per orei» ,nilbe) 24 30 36 Width inches: 24.) eeeeeMene reece (a. BobOUSoSn< 14 18 18 18 Bache 2 2550 wie Pe eae ainsi aac oan Seon 12.00 16.80 21.60 26.50 Hot Plates, Electric, ‘‘Multiple Unit’? Type, wound for 110 and 220 volts interchangeably. Size 63 x 18 inches reaches 400° F. on low heat, 600° F. on medium and 750° F. on high “heat, and consumes 330, 660 and 990 Watts, respectively, for these temperatures. Size®inches =... 5 Speers oe 12} x 123 12: x 18 18 x 24 63 x 18 Hach; OMevhe at). ese 17.50 24.50 34.00 15.00 Hach three neatss... cece ene 20.00 27.50 37.50 17.50 Extra Units; cache errr eco 3.25 4.00 4.00 2.50 RewiringvUnits;eachtecins.. 6 eee 2.50 3.00 3.00 2.00 oe) No. 30300 No. 30304 No. 30308 30300. | Hot Plate, Hoskins Electric, with heating elements of nickel-chromium. With 500 watts gives a maxi- mum temperature of 483° C. With pressed steel top 6 inches in diameter. Works equally well on alternating or direct current but voltage must be specified in ordering. Furnished with six feet of flexible cord and plug. Requires use of 5 ampere snap or knife switch............. 6.00 30304. Hot Plate, Hoskins Electric, with polished sheet steel top and cast iron legs. Spiral resistance unit covers circular area 52 inches in diameter in center of top, 12 inches square. Gives maximum temperature with 500 watts of 260° C. at center and 121°C. at edge. Works equally well on direct or alternating current but voltage must be specified in ordering. Furnished with 6 ft. of flexible cord and plug. Requires 5 ampere snap or knife switch for operation......... ... 8.00 30308. Hot Plate, Hoskins Electric, Three Heat, with polished sheet steel top 12 x 18 inches, with square steel legs. Resistance unit composed of three parallel windings, each controlled by a snap switch on front of plate. Heat distribution is absolutely uniform. At “Low” heat with 600 watts gives 177° C., “Medium” with 1200 watts gives 232° C. and ‘‘High’’ with 1800 watts gives 288° C. Works equally well on direct or alternating current but voltage must be specified in ordering. Requires use of a double pole knife switch 20 amperes capacity on 110 volts, and 10 amperes on 220 volts sismiueaaae te : : 25.00 Nos. 30316 and 30320 Nos. 30324 and 30328 No. 30332 30312. Hot Plate, Electric, Three Heat. Furnished with regulating switch, 5 ft. of flexible cord and snap switch. Gives maximum temperature of 315° C. when running idle. Of polished steel. Operates equally well on direct or alternating current but voltage must be specified in ordering. Mere thrain Chester eee erry eta sosea Mee eickeve en ajicesto, ane raroheeeere etc Res EET 6 6 TWIG hE ne Naa OSes bo dee ado Aer ONO ee See eE Ee en stedatodeocsetbe agdertacgs AY __ DOR ee eae es 5 ened oc Ben ocr ere IanC ar at anni S ope toda Coca 9.00 11.00 30316. Hot Plates, Electric, Three Heat, circular form, of polished steel with slate base, with regulating DAME CEE INC hese ee ee cites ries leie clisielae eters natok teas 45 6 8 10 LIE Tepe owes un oneloun Oo GUE cten Guo) mens Sadbeo toouedaE Elam 6.00 7.50 10.00 13.00 30320. Hot Plate, Electric, circular form, for single heat, with 6 ft. of cord and lamp socket plug but without regulating switch. Diameter, 44 inches. Of polished steel on slate base. Gives surface tem- perature when running idle on 250 watts of about 340°C. Operates equally well on direct or alternating current but voltage must be specified in ordering..............-...-++.-+2 0-055 4.00 30324. Hot Plates, Electric, rectangular form, for one heat. Of polished cast iron. Furnished with 4 ft. of cord but no plug. Will reach about 340° C. when running idle. Operate equally well on direct or alternating current but voltage must be specified in ordering. ILGrayqHo, eC NER bias ause. coednEn Coos 6 dtop coo non eb repEaccouNGnbrodcpuacsecpecaunr 12 18 \iaichiling shaveloteoepbcsonee cosometoncs GheeeoramOe oo 0d hid cobomnes so coDuoLOO ome EES 9 12 [DENG RUS Aes - oc an ea ot ee BO Ree BOOM Onretiras ocncgu on pucddourenE DODDS canbaeOen 11.00 16.50 30328. Hot Plate, Electric, rectangular form, same as No. 30324 but with three heats and furnished with IbGhaN, TCE ohn cep ames done HOMREEeEeE co Oo bom ot. acodoSnornaarondasacdogoad 12 18 \iieliing sind tes qancdas doadone Opodo beeeeen] (coca ne ovppugeenopacaonuntoossodat Coe 12, DEG eescoc on. 0 boo dks GORD oe pee BORA Etro co cfsn cc oP oS ooc0 es CASE MC ATODS 13.00 18.50 30332. Hot Plate, Electric, long form, with three moderate heats, very suitable for extraction apparatus Ibengthy inches: ....¢..-.-..:-; : ee Oe RT oo Seu UO Rona OU 24 24 Wadth> inches!,........-.- eyed ta SAS ee a kn aan ad aoe 23 43 DPC ERE Ce SS Odin SES Re EOE BO eGR OGRE rIgcin Herero eo « o OSE acre OnE Disa 5 Sach — 13.00 13.50 269 No. 30336 HOT PLATES, HERAEUS PATENT, WITH AUTOMATIC TEMPERATURE REGULATION. These plates 30336. 30337. 30338. 30340. are of aluminum with heating element of sheet Nichrome and reach a maximum temperature of 250°C. A micrometer screw is set to any temperature desired below the maximum, after which the plate will maintain the desired temperature to within 1° without attention, all of which is accom- plished without the use of rheostats. The plates are listed below both without regulator and with regulator for both alternating and direct circuits. As the heating element is contained in an air box 2 inches deep the hot plate proper can be removed and replaced with a plate with aluminum rings at extra price. Sizevofeplate: cms) cen eee cee eee ees 12x25 123x50 20x40 25x50 10x85 Maximum current consumption, Watts........ 400 900 1200 1800 1300 Hot Plate, as above, without regulator ..... Duty Free 11.50 17.00 18.50 23.00 25 Duty Paid 16.10 23.80 25.90 35 ss “ «with regulator for D.C., Duty Free 22.00 27.50 28.50 35. Duty Paid 30.80 38.50 39.90 49 with regulator for A.C., Duty Free 24.00 29.00 30.00 37 Duty Paid 33.60 40.60 42.00 51 SESS % 3 Aluminum Rings, for above Hot Plates. Diameter of largest size, em......... 1 ea eet 9 12 15 18 Number of rings in set...... : Tk See SSonaesere ba tne a 6 7 Duty Free, per set.......... NN ey ee sn he tse Be aie .80 1.00 1.20 1.40 Duty aid cme 6 aslo See ag a ee eee 1.15 1.40 1.70 2.00 NINN i \ No. 30344 ul. No. 30344 Age Rees oH Ur OR! Hee aoe Hm Of leMe ATS CHO Ml SRL AY aN) Vy; 30344. 30346. 30348. 30352. 30356. 30360. 30364. 30368. 30372. 30376. 30380. 30384. 30388. 30392. 30396. 30400. 30404. 30408. 30412. 30416. 30420. 30424. 30428. 30432. 30436. 30440. Hot Plate with Flask Heater, Electric, Multiple Unit Type. A practical combination of hot plate, flask heater and sand bath. The hot plate is removable and either the sand bath or flask heater may be inserted in its place immediately over the heating units. Attains a maximum temperature of 540°C which may be reduced sufficiently low for ether or alcohol extractions. The unit is replaceable by the operator. Complete with conneching cord and plug for either 110 or 220 volt lines. V oltage must be specified in ordering. . Loe 00 Extra Units, for either voltage...... .......... fetes oe, nh ery ii. ere eatOT OU: Rewinding Units at factory. each > Ae a. cleirarerae ts 35.00 cca “certified to four points and with certificate of the Physikalisch-Techhische er ieaciceatte Tm WOO GON CASO erie econo cakes ae ep erosocrn acer 55.00 No. 30360 Fig. 1 No. 30462 No. 30360 Fig.2 Hines ED S| a .- = P=} = i= fc pw bw fF iS B 8 E iS eoriser SoceCooe recor No. 30380 No. 304 44 Ae Rs he Ed) RG AR H ie te SON Mi AY fs GC #0 Me PR SAy aN) y¥ No. 30476 30444. Hydrometers, Precision, reading in specific gravity to the third decimal place. Set of six, 0.700-0.850, 0.850-1.000, 1.000-1.250, 1.250-1.500, 1.500-1.750 and 1.750-2.000. With separate thermometer incase. Spindlesarenotsoldseparately. In wooden case....................ceeeeeeeeeee 15.00 30448. Hydrometers, Precision, complete set as in No. 30444 but with certificate of the Physikalisch—-Technische Relchsans tal ie wiinkw OOGENLCASON.,.(cacuscoicre cetcate erent ohn oe SM ee ee neon 21.00 30452. Hydrometer, Baume, of German Silver, for liquids heavier than water, scale 0-50° in 1°........ 4.50 30456. © Hydrometer, Alcohol, Gay-Lussac, scale from 1°-100° in single degrees.............0...00.00--0- 1.00 30460. sf . Tralle and Proof Scales reading from 100° below to 100° above Proof and fromele FOR OO mw brallennisinglesdegreest.ccct 3. s0..c:c. «creas Anion ROR oe ee oe ene 1.00 30464. Hydrometer, Alcohol, Tralle and Proof Scales as in No. 30460 and also with enclosed thermometer. Us aGustony House standardupacterd sj... «ccc cs occ ase eee ee ena ieee 2.00 30468. Hydrometers, Alcohol, U. S. Internal Revenue Bureau Pattern, covering the entire range of spiritous liquors. No. 1,-0-100°; No. 2, 80-120°; No. 3, 100-140°; No. 4, 130- 170°; No. 5, 160-200°. DENG eatin oretieino concomeusic 504 00d DEER An Etats co sotoceancupmeaeeemoneaae 2.50 30472. Hydrometers, Alcohol, Complete Set, as above, in polished wooden case with leather lining, includ- ing one copper spirit can with standard thermometer: . ; ;....: See eet 24.00 30476. Hydrometers, Alcohol, Plate. Set of three hydrometers 9 cm in length, for testing alcohol in mu- seum jars and biological work without the inconvenience of pouring off a sufficient quan- tity to float the usual large hydrometer. Reading from 30 to 100% volume and tested in the Zeiss laboratories. In handsome case.....................- «tae ou sPaptecayevevevansas efeteererers Gicle . 5.00 30480. Hy drometer, Ammonia, 35-10° Baume scale in 3° Givisions:.....:c5 «1a: cistefels c.g ac sas uc iecahe ayaselase, Ainiaeneyeraicuel bv ova enceve 1.25 30516. Hydrometer, Lime-sulphur, for use in determining the degree of ‘density of lime-sulphur solutions, as recommended by Parrott and Stewart; scale is from 0 to 38° Baume and from 1.000 to 1.350 specific gravity, without cylinder............ Eso uaMeyeett al psy acsed eh oced ecteret ane raastay Srecetaicte Meters ane reeean= 75 30520. Hydrometer, as above, with special cylinder.. wip: i Sogadenie weed Nec PoneReN Nea eeahe Pe yan teehee Se daxsgey vets eeee: 1.00 30524. SpecraliGylind ersonlyeeree ery ae a le occ racrase sores area eel ooa eeT e e eeeers 40 30528. Hydrometer, (Salinometer) with direct re: uding in percentage of salt content, range from 1 to 100% HRW LCA 1 QUIS eR MOEN Eten eave cose as al sia creieicis.tyeuesmis os She crepes are ie oi orks CRC Iee STA ee 15 30532. Hydrometer, Storage Battery, with specific gravity scale, with range 1.100 to 1.300 and 7 ‘inches rial Ikeyayqiay” JBC NE Bad oms.dp ic cabrolee See eee ee Ona bes ats a ee ems on me eae se ee 75 30536. Hydrometer, Storage Battery, with syringe. “The pointed tube of the syringe is ‘inserted in the storage cell opening and the electrolyte withdrawn by means of the bulb. The specifie gravity is then read by the hydrometer floating in the cylinder of the syringe without the use of another con- tainer. Reading from 1175 equals total exhaust, of battery to 1300 equal full charge....... 1.75 30540. Hydrometer, Sugar and Syrup, ‘‘sweet water spindle,’ Brix scale, —5 to +5° in jyths........... 1.25 30544. Morse’s Rendimento, for tropical cane sugar factories. A special hydrometer with thermometer combined, for determining the possible yielk 1 of sugar from the cane by the density of the raw juice. The hydrometer shows how much sugar to expect and, by comparing this with the actual yield, the efficiency of the factory work can be estimated... 50550 0. HU) 30548. Hydrometer, Sugar and Syrup, Baume scale graduated in single degrees; 0-20° and 0-50°. Each .75 30552. Hydrometer, Saxe’s Areo-Pycnometer, for testing small quantities, only 3 ce of solution being neces- sary, range 1.000 to 1.060 specific gravity........ stays vapeuevetahen? Seis auetuclctd: 4 agers are leery am Ae cet et OO. 30556. Hydrometer, Vinegar, showing percentage of acetic ac id.. ; Din ater ban ee P 75 30560. if sé (Solidimeter), for solids in vinegar, ‘with thermometer..............--. 3.00 bo z 4 a0 S ee} ae 4 ae (e) = > 17) re) e) = uU > eZ. ~< — HAhh | | | | ¢ Dl Ain ea! NW il —————_ No. 30620 No. 30628 No. 30632 No. 30636 30620. Jar,” Museum, A. H. T. Co.fSpecial, with foot and ground in, air tight stopper with knob. A widely used jar for all laboratory and museum purposes, of special finish affording a great brilliancy and lustre and not to be confused with jars of similar shape to be had at much less price. See list below of additional sizes to be had on import orders. le@ralniny Golgosangupacor 10 10 13 15 15 15 15 18 18 20 25 60 IDeISy Geyncoooedouose 7.5 NO 7) ay) Sale 1 30 25 15 Macher em. cnnins ace 50 .80 .60 1.00 1.80 3.00 6.80 1.30 2.00 7.55 6.00 8.00 30620. Jars, Museum, A. H. T. Co. Special Import List. For the convenience of those preparing lists of our jars of a size (except in the case of wary large sizes) and to aggregate at least $50.00 in value. i f 5 5 Height yeme..s secs. 5 5 6 6 6 6 6 Diameter, cm........ “it. oie Si ena 2°. 8. Sse 8 Duty Free, per 10... (ine Wao seri 95 75 sets 75 LOS) SSIS RIESO lei ghityiCMmee. we sank u 7 df uf 8 8 8 8 8 8 8 Diameter, cm........ 2 3 Ave Oe 3. TA OO, Sue LO Duty Free, per 10... 275) 295) 1215) 2540) 0S PS 35 aS ES Oona O Height iems.. 2.2... 8 9 9 9 9 9 9 10 10 10 10 Diameter, cm........ 16 2 Be 5 © 9 2 3 4 5 Duty Free, per 10... 6.00 1.15 1.15 1.35 1.35 1.50 2.70 1.15 1.35 1.50 1.50 Height; emacs. +. 10 10 10 10 10 12 12 12 12 12 12 Diameter, cm........ 6 7.5 10:12 15 2 3 4 5 EG 8 Duty Free, per 10..... 1.70 1.90 3.00 4.50 5.55 1.15 1.35 1.50 1.70 1.90 2.40 Height ycem@ne... 65 12 12 12 12 12 13 13 13 13 15 15 Diameter, mm.......___ 10 12. 15 18-20 Be 10:16 2 3 Duty Free, per 10.... 3.75 4.65 6.00 7.50 9.75 1270) (2225) F375 EDO oO mnen Height cmerrece ccc 15 15 15 15 15 15 15 15 15 18 13 Diameter, em........ 4 5 8 10 12 LS 20 OOO) 2. es Duty Free, per 10.... 1.70 1.90 2.65 3.75 4.95 6.60 11.25 15.00 26.35 1.70 1.70 Height: emeenn peace 18 18 18 18 18 18 18 18 18 18 18 Diameter, cm..... ; 4 5 6 7 9 LOL Saal, 15 18 24 Duty Free, per 10. . 1890) 2305) 2:25) 22255) 3275) 4250) 4250) 480 e750 oO BOS 00 Heighit-.cmese ee eee 20 20 20 20 20 20 20 20 20 20 20 Diameter, cm........ eens 5 Qo es 8. 10 12s AG, 20 25 Duty Free, per 10... 1.90 2.25 2.45 2.65 2.85 4.80 5.55 6.75 9.00 12.00 18.75 Hele ht sCMeenes see 20 22 22 22 22 22 22 22 22 22 22 Diameter, cm....... 30 2 4 5 7 8 ROMROS) Rye 16 Duty Free, per 10... 37.60 2.25 2.25 2.45 2.85 3.30 4.05 495 5.55 6.90 9.00 Hevehtsacmoee eee ae 22, 25 25 25 25 25 25 25 25 25 25 Diameter, cm....... E22 Ge OG 20 25 30 Duty Free, per 10... 15.00 2.85 3.20 4.50 5.70 6.60 9.60 11.25 15.00 22.50 34.10 Eleight. cme see. ane 25 30 30 30 30 30 30 30 30 35 35 Diameter, em........ Sou 3 LO 12 1520 25 30 5 8 Duty Free, per 10... 56.00 3.90 5.90 6.85 7.75 11.65 19.40 29.15 45.75 5.80 7.20 Height cms.) 35 35 35 35 40 40 45 45 50 50 55 Diameter, em........ 12 15 20 25 10 15 12 20 10 25 10 Duty Free, per 10... 11.05 15.40 26.25 38.50 10.85 18.40 15.40 30.65 13.15 66.50 14.90 276 R A TP Jat AU TR H. Te Aree OS My -AS® -S CeO Mi Ra vAy aN “Y 30628. Jars, Museum, Hopkins-Columbia Model, as furnished by us in large quantities to various laboratories in Johns Hopkins University and Columbia University. The stopper of the jar is ground inside but the lid remains some distance from the upper flange. Glass and workmanship identical with No. 30620. These jars are not regularly carried in stock. et ghtsiem=erry acne tec. 9 1 12 13 15 18 20 Diameter yem=s. se ccna © 4 5 6 7.5 8 14 6 Duty Free, per 10..........- 1.30 1.50 1.80 2.25 2.60 6.65 2.40 Elerp hin cmteeerce ctessenr cr: 20 22 22 24 30 35 35 Drametervemecseccss. isc. - 10 9 20 14.5 15 9.5 30 Duty Free, per 10........... 4.70 4.00 12.50 7.35 11.60 7.70 75.00 30632. Jar, Museum, of same quality and finish as No. 30620 but with flat lid with air tight mand ine between the lid and top of jar and with the downward projection of the lid loosely fitting into the jar, thus preventing the sticking of the lid sometimes encountered when the ground surface is inside the jar. The flat lid permits stacking of the jar either when filled or empty. Meiehteemre. ae. - 10 10 18 15 15 15 15 18 18 20 25 60 IDES; Wille accogudadoc 7.5 10 7.5 10 15 20 30 12 15 30 25 15 Baht eer rseiec tacos as 5 80.60 1.00 1.80 3.00 6.80 1.30 2.00 7.55 6.00 8.00 30636. Jar, Standard Museum, Whitall-Tatum Co., with mouth same size as body; with rubber band and metal clamp and two glass suspension rings on under side of glass cover. By special arrange- ment with the manufacturers we offer these Jars at original factory prices. Height, inches........... + 6 8 2 8 6 8 12 18 8 Diameter, inches........ 21 21 21 2 21 4 3 34 5 5 Capacity; pints: 5... -;.- <1. 3 i 1 13 22 3 25 4 6 oF | DEY) Oh seo See omacte -38 Al 43 -A9 54 57 -62 73 86 1.08 Per dozent:.. sacs. - = 3.65 4.05 4.32 4.73 5.40 5.67 6.08 7.16 8.51 10.94 Height, inches........... 12 15 18 8 12 6 8 12 15 18 Diameter, inches........ 5 5 5 + 6t Us 73 73 72 UB Capacity, pints.......... 8 10 12 8 12 9 12 18 22 28 Bache ye f6ho 0). ee HESON LESS 1249)" LA eS 7 DOS Da G HE 4G 2; 70289 Wenidozens) sean sone 12.96 13.77 14.85 14.04 15.66 20.25 21.60 24.57 27.00 28.89 Flere hippinchestensctaeeacttee sponses ie see os Siar sewaas 24 36 12 18 24 Diameter pinches sameeren eiseinie es aoe we aceioee 73 72 113 113 113 (CEYIEXOUINE THON Beqeas cobaGde nee ocpooodoenes Ae Co aeooo ns 36 56 38 58 80 LOG i roar aiid ot SO CEa ae OBES USO CLEGG CEE an TeyEr Nene a 3.32 4.32 5.13 6.48 8.10 LEGGY 45 1a Sips done Geoods GOdo one caeS So eon ee cEEeEe nace ee 33.21 43.20 51.30 64.80 81.00 Fittings for No. 30636 Jars. Drameten-einchesheepere sae rmer ee 24 3 5 7 72 113 30640. ids monlyeneac hers cacy rte ne -10 -20 28 -50 1.30 30644. Clamps;ronly ,eachs-on.-- essenoee ice 24 -30 ee 54 -90 1.70 30648. Rubbers, only, each... 05 15 40 -60 1.40 30652. Jars, Museum, A. H. T. Co. Special Flat Top, with gound on lids of ae glass and with foot. The great variety of sizes offered and low prices have resulted in a very wide use of these jars. The foreign method of manufacture produces a jar of much finer appearance and finish and less sus- ceptible to sudden temperature changes than corresponding ware made in the U.S. See follow- ing import list for duty free prices and variety of sizes available on importation order. LEV oh ten CMs -eveccrhetoeen Sate iced aee 10 10 10 15 15 15 15 18 Wrameteriycmlssss atte cee ce es 6 10 16 10 15 20 30 15 LETT Wickit Ga SCG RU Leno Rcd Octet 35 60 =1.10 ay TE I ED) Levee Di MGMe ase ccrcieterens Cee eee Sine Sees anaes 18 20 20 25 60 70 70 MI AMELEE CMe erj-coe coteclesereie micas ois ee ie be 21 18 30 25 15 10 15 JOE 8 A OOS RBA AnD a SoGGIEn Er EGo GUE eae 2.30 1.75 6.00 3.70 4.35 3.00 4.95 30652. Jars, Museum, A. H. T. Co. Special Flat Top, Import List. free prices. For the convenience of those ordering Jars No, 30652 for duty free importation we give the following list of sizes available and duty lei ght emeaas. cel. 5 5 5 6 6 6 7 o 8 8 8 Diameter, cm....... toe 3 2 3 4g 1.5 5 2.5 3.5 5 Duty Free, per 10... sy Ast -60 -60 65 75 -60 -90 -70 -80 95 eight mem sre rice. 8 8 8 8 8 9 9 9 9 10 10 Diameter, cm....... 8 10 12 13 15 Oe G6 2 2 4 Duty Free per 10... 1.45 1.95 2.40 2.80 3.35 AU) LE EES EES) 75 -90 Height,cmsc..2s2.- 10 10 10 10 10 11 11 12 12 12 12 Diameter, cm....... i Dea LAG 8 10 16 8. 9 2 3 & 5 Duty Free per 10... 1.15 1.15 1.65 2.15 4.00 85 2.05 atti 90 1.00 1.15 Heightwem.n.4-2en 12 12 12 12 12 13 13 13 13 13 13 Diameter, cm....... ae GD) Siem 6 7.5 ORS Duty Free per 10... 1.85 2.55 2.80 4.45 6.55 95 1.30 1.55 2.05 2.55 3.35 Height, em......... 13 13 13 14 14 14 14 15 15 15 15 Diameter, cm....... OUEST Ne OM SN bey 2p 0) SE ae eee eG Duty Free per 10... 3.90 5.70 14.00 2.70 3.65 6.80 10.30 1.00 1.05 1.30 1.55 Height, em:...:..... 15 15 15 15 15 15 16 16 16 16 18 Diameter, cm....... Seer 10 120 ele Ome COO 1S Ge 20 es Duty Free per 10... 2.05 2.75 3.15 3.90 6.95 15.40 2.80 3.90 4.55 6.95 1.15 Height, cm......... 18 18 18 18 18 18 18 18 18 20 20 Diameter, cm....... A) 5 Si OL IIS dS 52s 4 Duty Free per 10... 1.25 1.55 2.25 3.10 3.75 4.45 6.40 8.35 11.80 1.20 1.25 277 Tim Lh ain il MI 3 Li ai " ll ae i ie Wy qui f No. 30652-56 Nar 30652. (Cont.) Height, cm......... 20 20 20 20 20 20 20 20 20 20 20 Diameter, cm....... 5 6 7 8 10 12. 13 14 15) es 18 Duty Free per 10... 1.55 1.75 2.00 2.25 3.10 3.75 4.05 4.50 4.95 5.75 6.40 Height, cm......... 20 20 20 22 22 22 23 23 23 25 25 Diameter, cm....... __ 20 30 35 5 id Ee On Te 18 3 4 Duty Free per 10... 8.05 23.10 42.50 1.70 2.20 2.60 2.10 4.20 7.50 1.40 1.80 Height, cm......... 25 25 25 25 25 25 25 25 25 25 25 Diameter, cm....... 5 6 7 10 12 15 16.5 18 20 25 30 Duty Free per 10... 2.05 2.10 2.40 3.80 4.65 5.90 7.30 7.85 9.90 13.65 24.65 Height, cm....... 28 28 28 28 28 28 28 28 28 30 30 Diameter, cm....... See eG 6 7 8 lo. 12 Ws 20 3.5 5 Duty Free per 10... 1.70 2.15 2.60 2.90 2.90 4.75 5.60 7.85 11.15 21.70 2215 Height, cm......... 30 30 30 30 30 30 30 30 30 30 30 Diameter, cm....... 6 8 9 10 11 12 14 15 16 20 25 Duty Free per 10... 2.60 3.25 4.35 5.10 5.60 6.10 6.95 7.50 8.65 11.90 18.20 Meightsrem)...-..-- 30 35 385 385 35 35 35 35 35 35 35 Diameter, cm....... 30.8 4 5 6 ed So Onl, 15 18 Duty Free per 10... 31.10 2.10 2.70 2.90 3.35 3.75 4.00 5.75 7.75 10.25 12.85 VeVghitsiCme sie) y-1-/-j1: 35 35 35 40 40 40 40 40 40 40 40 Diameter, cm....... __ 20 25-30 4 5 6.5 seo 15 20. 25 Duty Free per 10... 15.50 29.75 42.00 2.80 3.10 3.95 5.05 6.45 12.50 18.40 38.60 Height emi... 40 45 45 45 45 45 45 50 50 50 50 Diameter, cm....... eS 8) 8 10 15 20 25 5 6 8 10 Duty Free per 10... 52.50 3.35 5.05 6.45 13.75 22.25 40.25 4.50 4.55 6.45 8.70 eiehtyem ya). 50 50 50 55 55 55 55 55 60 60 60 Diameter, em....... (ees ae 20 6 8 10 12. 15 7/5 Oe Duty Free per 10... 10.90 15.50 24.00 5.75 7.65 10.65 14.25 17.25 8.35 11.85 13.20 leva Gitoscoogee 60 60 70 70 70 70 70 80 80 80 80 Diameter, cm....... 728) 20 ED, 10 12 150 20) Se Oe 15 Duty Free per 10... 19.00 27.50 11.15 13.10 14.40 21.65 32.75 13.95 16.40 18.60 25.15 Mel ghtcm sceneries 80 90 90 90 90 95 95 100 100 100 Diameter; (CM! rte. ee - - e208 8 10 12 U5 a0 A2 See 15 Duty Free per 10......... 38.00 18.15 20.60 23.00 32.30 22.90 27.35 22.55 27.25 45.25 30660. Jars, Rectangular Museum, A. H. T. Co. Special, with flat ground on lids for permanent sealing. Of heavy clear white glass of extra fine finish and annealing. Much superior to jars of similar appearance which are sold at lower prices. Plain finish only in stock. See also following import list for duty free prices. Meiehit tems 2 ciisaeltistesisere cerita eres 10 10 12 13 15 16 20 20 20 Widithicm:n. ern ceaster raiser ter vi 5 6 Sal Ob LOS a2 6 10.5 15 IDY-;oLHh Osspodndasoopnpaces 50 p0g0%0becc0e 2.5 5 5 ee) 4 5 7 1D WeouaacadeopcodanecondseaceanobonoseT 40 565 .60 .70 80 1.10 .75 1.20 1.75 Hel phtenemscerich. cee a eee 21 26 26 26 29 30 37 42 45 46 Wadth cm) y-hesreriny eeu rcaacrr 21 65 15 21 15 20 25 10.5 12 25 Depths Cm sj-cises. cen eset ORS zSis\ 6 18 14 7.5 9 16 Bach revs 43.6 eee< Ro ee 2.85 1.15 2.30 4.00 2.00 4.35 5.00 3.20 3.30 6.00 30660. Jars, Rectangular Museum, A. H. T. Co. Special, Import List. For the convenience of those ordering Jars No. 30660 for duty free importation we give a list of the sizes available and duty free prices. ground and polished. 278 These are furnished in two styles of finish, i. e., A plain, and B, with one wide face mL ji 1 t : it p No. 30660-64 30660. (Cont.) Herhiem=ss saa. 10 10 12 12 13 13 14 14 14 15 15 Widthywem:.- Ae = ik: 9 11% 123 143 163 18} Diameter, inches.......... es 83 12 123 123 133 15} LEY? os oo anteices Dee aS 40 -60 1.00 1.25 1.50 1.75 2.50 30748. Jars, Stoneware, low form. The sizes listed are frequently used for temporary preservation of speci- mens in comparative anatomy. They can also be furnished on special order up to 50 gallons capacity. With covers. Boxing charged extra at cost. Capacity, gallons. sleidterstereusts, ox eet ai sverstersss Leaman 4 6 10 15 Height, inches..... = : Beers BONS picts 10 12: 144 Diameter, inches........... : 5 eer 1S 15 173 193 DEA NSS ccc Oa eee ee eRe eared ote ACS EON On 4 1.00 1.25 Paras 4.00 30752. Knife, a convenient laboratory knife for preparing pot ato cultures. paring corks, etc. = tae 20 30756. 30760. 30764. 30768. No. 30756 No. 30760 af Nw Nh (ev) Rasa) | ie ew | Labels, Dennison, gummed, on white paper with re »d border. Number PR 217 213 209 205 201 Size, inches............... Text? Tel 15 lt seco INumberant boxsssnaecee ce 125 100 100 75 _ 100 Ber box s2.2.a0).ceceeionce -06 -06 06 -06 06 06 Per carton of 1 doz. boxes.. ‘50 50 50 50 50 50 -50 Labels, Dennison, gummed, in books, white with red border and rounded corners, in sheets, perforated, bound in book form. Size of book 9 x 5 inches, with 25 sheets in book. INUmberreeaee ee 225 223 221 219 217 213 209 205 201 Size, inches........ $x 2x ix lix? Ux xB Wx blBxh 3x8 Number in book... 1575 1400 1050 750 750 75 590 300 225 Per/book: 23:65 04- 25 25 25 25 25 25 25 25 25 Carton of 6 books.. 1.25 1.25 1.25 1.25 1.25 1.25 Mss 1.25 1.25 Labels, Dennison, gummed, perforated, in rolls. Each roll is contained in a special box with slot opening so that labels can be drawn out as needed without opening the box. Each roll contains 1000 Tabels: INamberia. eee scart ctecia Steysueciais, 4 teres wore L 221 217 209 205 SIZE SIN CHES 5) c< alee, we cele nhc reser Te aL Tee ee ceoe nero eet Xa Lixl®s Liexlt 1H xls Per roll.. A5 -50 -65 70 Labels, Dennison, gummed, white with red border, large rec et angul: ar shape. Packed 100 in a box. IN bersreee seer eee 2004 2007 2002 2001 2006 2005 2003 Size, inches.........-.- 23x13 2ex1f 3x1 3kx1l% 4x 4a: xe AR x2 Rerjboxseee eee On as 15 -18 -18 .20 .22 Per carton of 10 boxes.. 1.00 1.25 1.25 1.50 1.50 1.75 2.25 282 A 18 No. 30776 No. 30784 No. 30788 i &) © SS, ce & > - | i 1 | ur 2) b=) Ea No. 30796 | 3 =a | 1 3] = i 4 =| E \ zg Ff 6 =| = | =s EM = =_ id See i E| GH wr No. 30800 No. 30804 No. 30816 No. 30820 No. 30824 No. 30840 30772. Labels, Dennison, gummed, on plain white paper without border. Circular. IN;iira Oye) po Gaerne CAAT ODA Ee on SAU SC AOE ES Thea nD nanos A81 A83 AS4 ASS A109 Drametenpinchesys.eecasee cee enine aoe sree ees z 5 i ts er boxcof-l00o ssh careers ose ee cae esies 10 a5 5 als 20 30776. Labels, Dennison, gummed, on plain white paper without border. Rectangular. No. A18, size 13 x4 inches. Per box of 1000.. RCO DEE ne Seen OUrnine cord inte bor heking posh aan oenten 25 30780. Label Book, containing the names and formulae of the most used chemicals and re: wgents. Printed on good paper, gummed and perforated and bound in book form. Per book................ 40 30784. Ladles, of wrought iron, withwlipw4sinches imldtameten scene eh ection ete en: socal) 30788. Lamps, Alcohol, of polished brass, with screw top and metal cap. Capacity AAOUNCEs emer pe ees oes ck het cic mietee castles Mian ae Meee 2 4 8 IBS U CUE eyesore vere ete) ete es ete ence e ee che assay co aveua) 3) aye. el bys iaya,ouseusy Svenesohece anagereyaueyeisaee 50 -60 75 30792. Lamp, Alcohol, Gigbrasssnwat hw ck-icapacibysc) OUNCES \s D 4 ae E nD re 4 ae fo) M A 8S GO} Me Ree Aw Nieeys sae No. 30848 No. 30856 No 30864 No. 30872 5 No. 30888 30848. Apparatus for the Decomposition of Hydrochloric Acid, Water and Ammonia, with platinum electrodes ANGISUPPOLLAC a ase oy srecisyeseysce> Sovak Se ean n Cis swe Saeteheig tate ece Mee sole Tone Teen See oe ee ae eee 6.00 30852. Glass Parts only for No. 30848, with platinum electrodes :..c.6 css net teinisie/s eee 3.00 30856. Apparatus for the Decomposition of Water, Hydrochloric Acid and Ammonia, with two platinum elec- trodes and glass stopcocks, on support with binding screws...............e000--. 002 eeee- 10.00 30860. Glass Parts. only for No. 30856, with platinum electrodes................sehee ea 6.00 30864. Apparatus, same as No. 30856 but with carbon electrodes................-00.2-s-000es+ceeee eee 10.00 30868. Glass Parts only for No. 30864, with carbon electrodes............00-- 200 sc-+eeee - seems 6.00 Note—The complete outfit for the decomposition of water, hydrochloric acid and ammonia consists of two No. 30864 connected with one No. 30856. 30872. Lecture Eudiometer, with platinum electrodes, two stopcocks, one graduated arm and support.. 10.00 30876. Glass Parts only for No. 30872, with platinum electrodes..................++eeess+ +e eecee 30880. Apparatus for the Decomposition and Recomposition of Water, with platinum electrodes in middle of tube; two classstopcocks and! support... ..)..<.. 0. «eneeieeieies oeisiee Oe ee ee eee 10.00 30884. Glass Parts only for No. 30880 with platinum electrodes..................eeeeeee+eeeeeee 7.00 30888. Apparatus for Demonstrating that Three Volumes of Hydrogen Combined with One Volume of Nitrogen to Form Two Volumes of Ammonia. With platinum electrodes, two glass stopeocks and cap POL bir core cone cote te evteM RS Tons teres i sodev's aie . shee 101 Nk 110 NK 119 NK Lens Diam. in Inches....... BB Rec eS e ee Hacc toa. S z 1: POWen sacs ee ee af ee ie Ra Ra rit TED 5X SLEIS< | DEY ol ( ger SIE NR dt RRR co 8 ae NRE SS eco 50 Boy -65 Magnifiers, Pocket, Nickel Mounted, Double Lens. Otherwise same as above. NIM DEn eer 5 rs a5 SAE ARPES Son Ade 102 NK 111 NK 120 NK ens! Diame mr inchesse ne eee eee eee be : 33 iat 14,14 Range of Powers......... : ibs ec oe 5 to ‘12 >< 4to9X 3 to 6 X LON TS Nahe ao cure e eee see .arereo ry Sc tc sopantmedcsaacneccde -70 -80 95 Magnifiers, Pocket, Nickel Mounted, Triple Lens. Otherwise same as above. ING Der e851 ey Ac ae eer oe ... 103 NK 112 NK 121 NK ens Diam anlnches:. “te... eee ee eee 2,3,2 eae a alt 18, 18 Nan Ge OLIPOWETSS -t. 02,28 sete clears ee Cee ee ee 4to20X 3.5tol7 X 2.5 to 9 X OE el Nera eee one SO Sie aE es os day Pie 1.00 1.26 1.35 286 Nos. 1, 2, 3 No. 30976 Nos. 173a, 172, 17la 30988 Magnifiers, Doublet. Good lenses at a very moderate cost. Consist of two separated, plano convex No. 30976. 30980. 30984. 30988. 30992. 30996. 31000. No. 30992 No. 6 No. 30976 Nos. 168a, 167a, Nos. 168, 167, 166, 165 166a, 165a No. 30984 No. 30984 No. 7, 7a No. 30976 Nos. 173, 172, 171, 170 No. 30980 No. 30980 No. 30988 Nos. 163, 162, 161, 160 Nos. 163a, 162a, 16la, 160 lenses. Nos. 1, 2 and 3 are mounted for dissecting microscopes, No. 6 is a hand magnifier with hexagonal handle and No. 7 and 7a have folding pocket cases. Number. . Sento ech cate eae Ree 1 2 3 6 7 7a Hocusinelnches nc. eee eee ee ile 1 3 q 3 3 ROWER rere oe ee ee UX 10 X 14 X EEX 14 X 12< Sa Cheeta tes toe pte eee re 75 75 75 75 1.00 1.00 Magnifiers, Coddington. Give a good definition and a wide field. Composed of a cylinder of glass with a deep groove cut in at equal distance from ends to serve as a diaphragm; ends of cylinder ground spherically and polished to formlens surfaces. Nos. 163a, 162a, 161a, 160a are mounted for use in dissecting microscopes, and Nos. 163, 162, 161, 160 in folding pocket cases. Number see ere cise 163a 162a 16la 160a 163 162 161 160 Focus in Inches.... ile 1 3 : 13 1 3 BOWEL Caer areiacrccar 7X 10 X 14 X 20 X (ax 10 x “ xK 20 X LEY N3iee SCe eee 1.25 1.25 1.25 1.25 1.50 1.50 1.50 1.50 Magnifiers, Triple Aplanats. High grade magnifier with large field and perfect correction for chro- matic aberration as well as flatness, astigmatism and distortion; new construction designed for highest grade work. Composed of two meniscus lenses of flint glass separated by double convex lens of crown glass. Nos. 168a, 1672, 166a, 165a are mounted for use in dissec ting microscopes and Nos. 168, ‘167, 166, 165 in folding pocket cases INftinleseApooodeAoD Oo 168a 167a 166a ” 165a 168 167 166 165 Focus in Inches...... ie 1 z 2 13 1 j & POWER Sotistecee te ortine ieoex 10 x ly >< 20 X Ue x 10 x 15 X 20 X Ba chiar re seyenica ce 3.50 3.50 3.50 3.50 3.50 3.50 3.50 3.50 Magnifiers, Hastings Aplanatic Triplet. With a very large angle of view and corrections of a high order. Nos. 173a, 172a and 171a are mounted for use in dissecting microscopes and Nos. 173, 172, 171 and 170 in folding pocket cases. Number BRE hae Ae a) APE aTR) « 173a 172a 171 170 Focus in Inches............. 14 1 q 3 Power.. Cox 10 14 xX 20 X DEY) Oe A aR ater 7.50 50 7.50 7.50 No. 30996 144A No. 30996 144-2 No. 30996 144LP No. 31000 Magnifier, Tripod. Used for elementary biological work and dissections. Lens mounting screws up and down in brass frame for focusing. Diameter of lens one inch, power 7.5 X............ 35 Magnifier, Watchmaker’s. Easily held in orbit of the eye; No. 144LP has detachable spring to pass around the head. Lenses furnished in two different diameters (sizes 2 and 3), with same eye opening in each case. No. 144A fitted with two lenses, one removable to give two different mag- nifying powers as indicated below. Number......... Se 144-2 144-3 1444 144-2 LP 144-3 LP 1444 Lens Diam. in Inches..... 1 1; 4 1 1i Bal Range of Power.......... 2to0 10 X 2 tod X 10X 2tod5 X 2tod X 4to 10 x BAGH Ps. $e ent 40 40 40 aoe 55 .60 Magnifiers, Engravers’ ‘Glass. Designed for engravers, carvers and die cutters, also available for biological work, retouching and use as condensers because of their large clear field. Nos. 146-148 made with two plano-convex lenses giving flatter field and better image than one lens. All styles in vulcanized mountings. INUmMbeGasawist dane cit sons J eta eee oe econ 146 148 ee A 148A Lens Diam. in Inche Soi Seite earth e eee 13 24 25 TOW OTe aon a chs NaNO IE ee eas:s ede EES «cleats aes Brava ve Sie 2.0 3 BS 2.5 X Be Haye ese eters fola fica chaiera: avetene/ofere squat aces Vatu aaj assraceietetanate’ sapere eta ate 1.50 2.50 75 1.25 No. 31004 No. 31008 No. 31012 31004. 31008. 31012. No. 31016 31016. 31020. 31024. 31028. 31032. 31036. Magnifiers, Linen Testers. Intended primarily for counting threads in cloth, but used for beginners’ classes and various other magnifying purposes. Mounting hinge to fold up compactly when not HMTECS INN woescucadsccuobdee Sis 141 1413 142 143 1433 Openingsiimiinchesseee eee eee eee 1x1 ix +x ixi © } dia. BOWED SS nk ee ee oe wx LOK OPO Senlox. Eachipoaiss ep ey 2 Pane Ques. #: 2.00 45 45 45 45 Magnifier, Cloth Counting Glass, with base divided into spaces of 4, } and 1 inch and the space be- tween the 3 and 1 inch marks divided into 10mm. With focusing eyepiece with pointer attached which traverses the whole scale by means of quick acting screws. In leather covered case... 7.50 Magnifiers, Reading Glasses. Regularly furnished with nickel rim of sufficient width to protect lens surfaces and with handle of ebonized wood. Lens Diam. Inches........ 2 23 3 33 5 2 6 Hocus meInchestep ss. hee nd 6 7 8 10 12 13 14 15 60 2800 1-00) 1-50) 921000) 2:25 SOS OO SSO ==> CCHTEPPTEYPPPPPpvrTyVeOPTY pre = - mm No. 31024 No. 31028 and 36 No. 31032 MAGNIFIERS, ZEISS ANASTIGMATIC COMBINATION LENSES FOR DISSECTING, ETC. These excellent combinations are to be recommended particularly because of a compara- tively large field of view, excellent definition and remarkably long working distance, and are furnished in simple mount for use in a dissecting microscope, handle and lens ring, or small tripods, as well as in single and double folding pocket cases. The Briicke system is designed especially for dis- secting with the Mayer Dissecting Microscope and the sys- tems may be used separately as simple magnifiers or with the ocular for greater magnification. To secure the best results with all simple magnifiers the observer should place the eye as near as possible to the magnifier. Dissecting Combination Lens, Briicke, giving powers of 11, 17, 30, 40, 60 and 100 diameters with the different combinations used singly or with the ocular Duty Free Stock 50) See eee teredts daca citrt deco. catia near CGR MABEBS calcacsode 10.00 12.40 Dissecting Combination Lens, Briicke large, with lens of a free aperture of 25 mm, power 5 to 10 diameters, with working distance from 60 to 70 mm and covering field from 7 to 18 mm in diameter....................--.0-- 8.75 10.85 Magnifiers, Anastigmatic, in simple mount, for use on dissecting stands or in lens ring with handle, small tripods, ete. No. 31020 Magnification’. pose once eee eeeeereee I eee ee eh 16 X 20 X 2X Diameter of field of view, mm........... efor Aly SRR Be eee 10 8 6 Free working distance, mm.............. Sj ayaietenche oie tovaye aucssteheeiecs tee eee 9 7 5.5 Duty Breevs: 36. 20) ee Sac eeepc cross osha Sate eeh eee 5.50 5.50 5.50 Stocki are cnctie oe Cee eee Gir crete: Aaron eee 6.82 6.82 6.82 Magnifiers, Anastigmatic, same as above but in single folding mount. Mapnificationt: sacks asc sticeinere tei cent erro lehsistein eee nae ys eee 16 X_ 20X27 X LOCA al 0) -(- Gn Se ee eS 01 OS PG SISO A SERS Rn Anco aooe 6.25 6.25 6.25 Ta Se tama a RE 3 5 oo Ans Me Sos ca. 7.75 7.75 7.75 Magnifiers, Anastigmatic, same as above but in double folding mount. Magnification yh. celseeri tea eee metic __10 X and 20 X 16 X and 27 X 20 X and 27 X DutysRrees 5.hc. ose eee a ee 10.50 12.00 12.00 Stock. 63550 20 cee ee ae 13.02 14.88 14.88 Plankton Magnifier, Kolkwitz, a special magnifier of 40 diameters, very useful in field work, giving a field of view 2mm in diameter with a free working distance of 3mm. This magnifier has a nu- merical aperture of 0.27. See R. Kolkwitz, ‘““Hninahme-und Beobachtungsinstrumente fur biolo- gische Wasseruntersuchungen.”” Mitteilung aus der kéniglichen Priifungsanstalt fiir Wasserver- sorgung zu Berlin, 1907, Heft 9, . 126 and 127. pp. Duty reese wesc sesh mercies 12.00 Sto OKs \-)<::0/00cs:si0lorevoso ere eee 14.88 288 No. 31040 (SS ll_ 2S ei ost itt No. 31072. No. 31076 ZEISS No. 31068 No. 31060 No. 31064 Magnifiers, Zeiss Anastigmatic Combination (Continued). 31040. 31044. 31048. 31052. 31056. 31060. 31064. 31068. 31072. 31076. 31080. Magnifier, Low Power, for use either i in handle or on lens stand as listed below, with a power of 23 diam- eters, field of view 100 mm in diameter and free working distance of 100 mm. PRS OCRC real, Lens Ring, without handle, for use with either of the Briicke systems when same are “ae be used in combination with lens stand. Hi yah RR eta a err fs Par Re ero cs a ey Sante ag Maras nek eta GUI 5 Windiegnid GORe Ole On Oat cbloe CoRR EOS IC OIG OCR RS CC rie aan nearer eee ee eee Handle, only, for use with above Lens Rings; illustration shows ring in position in handle.......... .50 Tripod, with ring, to take any of the three Anastigmatic Magnifiers in plain mount.. ee oso 200 Lens Stand, adjustable, for use with either the Briicke combination dissecting sy stems | or - the Anastig- matic Magnifiers in plain mount in combination with the necessary rings. Illustration shows large Briicke dissecting system with ring in position. Duty ree ys peer ore eee ck cin: 3.75 Stoc keys eo eae nh rete e as 4.65 Lens Stand, adjustable, with hinged joints and rack and pinion adjustment, without lens or ring. Duty Freeney: see ose. se one fe 10.00 Stocks-2)- sarees 4s tale Be PE os 12.40 Object Holder, Wolf, designed expecially for Entomology and for use with Anastigmatic Magnifiers in double folding case and with lens stand No. 31064. Price does not include the double magnifier shown in illustration but does include cork pinning blocks of three different shapes. In leather case with space to accommodate magnifier. DutysRreevie en i a.te coe eee: 8.00 Stockpserat so cE OnE ee O02 Manometer, consisting of glass U tube on wooden support, with scale. Without mercury......... 2.00 e Bennert, with glass stopcock and movable scale engraved on wood. Without mercury, 5.00 eG oe with movable scale engraved on glass. Without mercury . : . 6.00 Note—When desired the Manometers No. 31072, 31076 and 31080 will be shipped filled sane mercury at customer’s risk, with the cost of mercury added at market price. 289 No. 31092 Le Cee eee ee ae [uctmc ARTHUR H. THOMAS Co. : t PMILA No. 31096 AL PAE PES EL BOY LAN Ue MAP ARTHUR H.THOMAS CO. PHILA No. 31096 No. 31100 a eer Le | ere 3,4) ‘ \)ai3 2i4 25 ale 2|7 2\s 29 3io! RC PS OREO Ue THTTTITTITITT] aa ill No. 31104 No. 31120 No. 31128 No. 31132 No. 31136 Manometer, Differential, Konig. For measurements up to 20 mm of water pressure. With bottle of standard phenol solution. See Lunge, Chemisch-technische Untersuchungs-methoden, 5. Aufi., p. 189 or Chemiker-Zeitung 1889, p.71. In polished case with glass door.................. 18.00 Gauge, Seger Draft. See Lunges Sodaindustrie. Very sensitive, for measuring the difference of drafts in flues, ete. With bottle of phenol solution nia tiasa/a'eraveloua (eels « ajc eee eee Manometer, for measuring very slight differences in pressure, as in the determination of the specific rate of gases, etc. See Zeitschr. fiir phys. und chem. Unterricht 1905, p. 199 MEASURING APPLIANCES Rule, Boxwood, graduated on one side in millimeters to 30 centimeters, on the other in $th inches to 12 IChES sey oes se ese saa os Sele ao a aiais sie moe ace tea a ae ees ae: enone se ae Rule, Celluloid, 6 inches long, in both metric and English, with comparative Centigrade and Fahren- heit thermometer scales on the back. A convenient vest pocket rule for the laboratory work .05 Rule, Steel, with English and metric s sc ales, gradu ated on one side to 3 millimeter and 3, 2s, +, and 4th inches; and on the other to #5, ds, Su) 25 Gs) os > zs and yh inches. Length 6 inches (150 mm) .75 Meter Stick, with brass bound ends, graduated i in metric system on one side and in inches on the other .50 Meter Stick, as above, plain, i. e. without brass bound _ tips Jiere bulehee sb edule hee -25 Half Meter Stick, exactly the same as above but only } meter long, with metal tips.............. -30 Rule, folding caliper, of boxwood, graduated on one side i in millimeters and on the other in ;;th inches. Length: (unfolded) inchesss22e- see anon cron oe.oeks biden ee eee 6 12 Biachiss cis hd... ts os pe eels oe cee nc oc Sr ee -30 -50 Rule, Decimeter, Steel, one decimeter long, one centimeter wide, one millimeter thick and graduated in centimeters and millimeters. Volume is 1 cc and weight in grams is the specific gravity. In metal bound leather pocket ‘case... osjsces cco ee cess s cneies scl ssw clee nn Oe ee eee Caliper Rule, pocket form, of polished brass, with both English and metric scale up to 6 centimeters and 22 inches. Very convenient in laboratory work. ...................----.5-++-- eee -50 Micrometer Caliper, nickel plated, graduated to ;4;th millimeter. Sizes given are the maximum open- ing between jaws. Scale, from 0 to, mm...................--...--- 10 15 20 LOE ee eee ee Mn EAS Aan cle soarcotcc Sud Con Tee macnn 1.75 2.00 2.25 Micrometer Caliper, B. & S. American Standard, 1 inch reading to ;);5th of an inch............ 5.00 th millimeter............ 2.00. e eee eee eee tent enes 1.50 31164. Vernier Caliper, of steel, graduated in millimeters and inches, 20 centimeters long, with vernier reading UO SNe erel Ibis gh an Gant ne ate EE OS Ooch Ab Ark SEo Aono SOaraDpOUOnoOSS 2.00 31168. Caliper, plain, of steel, for inside and outside measurements. .............--e eee eee eee eee eee -60 31172. “ with graduated measuring arc, reading in millimeters to 80 mm and in jgth inches to 3 inches 1.75 31176. Measuring Cones, of steel, nickel plated, for measuring holes, graduated to yoth millimeter. Cale Mmm te cinders Seieree eters Wetnencie cielacrs ontineioe Cotsen oe emer eee 1to 15 15 to 30 LOE] Tage GGe ene oa ESI OBICL St Eo bar Ene ay ene eC rape oem ares OR OKOG 1.00 1.50 31180. Tape Measure, Linen, with English and metric graduations. In nickel plated case with spring. TOMA Hada, TACO pacopnanobeoppeonoeur Mane neceenoococr cc oGsouEcTe ou peUdSOOROE ell 2 LOENG Tuer dis dooegs 6d Gn CRORE DARED Shanna oe EEnecn er rcasanocaansamoncoroubonons 25 40 31184. Tape Measure, Steel, with metric divisions on one side and English on the other. In German silver case with spring. Very convenient in laboratory work. Total length, meters... 1 2 15 1.00 No. 31188 31188. Micrometer Microscope, a measuring device for use in calibrating or verifying thermometer scales etc., or as a comparator. With two microscopes mounted on horizontal carrier, each with micro- meter fine adjustment and one with Fraunhofer ocular micrometer. Reading by means of Fraun- hofer micrometer to =}; millimeter. IDK 7U Ue oS woge aati ho cumoeonES 84.00 Diy sPald noes ce ce eens .. 105.00 291 31192. 31196. 31200. 31204. No. 31200 No. 31196b Micrometer Measuring Machine, Model of 1910, for actual as well as comparative measurements, reading by comparison to an accuracy of ;;;th of a millimeter and giving absolute value meas- urements to ;;55 of a millimeter; total length which may be measured 300 mm, with centering device. This instrument is of great value in shop and laboratory practice where great accuracy is desired. Larger models measuring up to 2 meters quoted on application. Duty: Free. Se «a5 hase oeee 480.00 Daty Paid)... ..cccc.. csc eee 600.00 Micrometer Microscope, Fraunhofer, measuring a total length of 20 mm and reading to +4, of a mil- limeter. Mounted on tripod with axis so that same may be used vertically (Fig. a) or horizon- tally (Fig. b). The tripod is folding and the whole is mounted in a neat wooden case. Duty ee ee dhe brie Sisciyekiw ean eke “84.00 Duty: Paid). .24.0.c4.75 eee eee 105.00 Microscope, Measuring, with vertical and horizontal scale on silver reading to ;j th millimeter. The vertical and horizontal scales are 16 cm long and are both actuated by rack and pinion. The microscope rotates in a -vertical plane and may be clamped in any position. The horizontal and vertical positions of the microscope are definitely marked. A glass micrometer scale is placed in the common focus of the eyepiece and objective and serves to measure very short dis- tances without moving either slide. By substituting a telescope objective the instrumentmay be used as a reading telescope or as a short range cathetometer. With one ocular, a 2 inch micro objective and extra telescope objective. Duty Frees. tors oe wee 54.00 Duty Paid.s.. hw.idet see ee 68.40 Extra Micrometer Eyepiece for above, reading to ;,) th of a millimeter. DrutysFrec ee teks cee es eon Daty Paid :....e5s2 caese eee 32.30 "No. 31208 Micrometer Microscope, or Comparator, for the most accurate measurement of spectrographic negatives and other measurements of great accuracy. The separation of two spectral lines, for instance, is measured by direct comparison to a small scale on the speculum metal, the coefficient of expan- sion of which is equal to that of the plate itself; reading by means of Fraunhofer micrometer in the ocular to ;,55 millimeter, which diminishes the error of the thread 3th. Particularly rec- ommended for rapid measurements as the screw carrying the stage or table is immediately disengaged and its position changed. MOM IMEASUIEN BeOVERATCII sales teres, cals cidsaidns «tls clase) situa eiclels ol tctone, olete ateve siete ebeemera eretere 9x12 18x18 DITA LCOS rane asca tap inn SOD e aH aes a nanECCnetemareist acoesiocoocoanooc 321.60 480.00 Dityehaides see: : Biers Qe teeta oa ae Snes OE ee Reeser 402.00 600.00 31212. Micrometer Microscope, Hilger, 1913 Model embodying the following modifications— The mirror moves with the travelling microscope. The milled head for turning the screw has been replaced by a handle. The standards which support the slide and substage are so designed that the axis of the microscope is sloped towards the observer. A vernier has been added, reading to 0.001 mm. Though specially designed for rapid and accurate measurements of spectrum photographs, this instrument can be used with equal advantage for any of the accurate length measurements needed in a laboratory. With the aid of the handle now provided, one can pass rapidly over the whole range of motion, while at the same time the large drum- head enables measurements to be taken to 0.001 mm. The base is of cast iron and the microscope slide is mounted on two cast iron standards of such shape as to form convenient handles for moving the instrument. Length of horizontal motion, inches Duty Free............ 164.70 197.10 Duty Paid............ 225.70 270.10 , No. 31212 293 No. 31216 No. 31216 MICROSCOPE, MEASURING AND SCREW TESTING, LARGE MODEL. This instrument has been designed 31216. 31220. 31224. to give absolute measurements of small objects to a very fine degree with extreme accuracy. It is particularly useful for measuring and checking such articles as micrometer screws, divided scales, standard gauges, dies, etc., and is constructed for great ease of manipulation in such work. It is designed to give the length and pitch of a screw to .001 mm, the maximum, minimum and effective diameters and depth of thread to .01 mm, and the angle of the thread to 5’ without the necessity of moving the screw after it has been once set up for examination. The object, according to its shape, is either held in one of the chucks, A, of the rotating, divided holder, B, or fixed on the stage and its length measured by moving it across the field of the webbed ocular, P, by means of a micrometer screw with a divided head, C. The pitch of this screw is .5 mm and the head is divided into 100 parts; the fractions of these divisions are read from a vernier to yh) mm or x;}5; inch. Entire millimeters are shown by an index on the scale, D. The plate of the stage is held against the flint hard point of the screw by two long spiral springs set in the same plane as the dove-tailed fittings, one on each side equally displaced. The point of the screw is turned ona separate piece of steel to the thread; it is hardened, ground and polished, and let into the main piece before the thread is cut. This is done to prevent distortion of the thread which would occur if the hardening were done after cutting. The screw, which is of the most accurate description, is cut be- tween dead centres with a single point. The width of an object is measured by moving it across the field by means of the milled head, F; the amount of the traverse is read to .01 mm by the scale and vernier, G The angle between two lines, edges, sides, etc., as, for example, the angles of a screw thread, is ascertained by rotating the webbed ocular. One of the webs is brought coincident with a side and the milled head of the tangent screw, H, is turned until the web coincides with the other side. The angle is given on the scale and vernier, K, to 5’. The milled head, L, actuates a tangent screw which inclines the object under examination to the optic axis; the degree of inclination is read to 5’ by the scale and vernier, M. As the object lies in the same plane as the axis of rotation it does not go out of focus on being inclined. When the pitch of a screw is being measured the screw should be inclined the same number of degrees as the angle at which the thread crosses it; this angle can be approximated or else measured accurately by means of the circle attached to the ocular. The object is focused by an ordinary rack and pinion coarse adjustment and a micrometer screw fine adjustment; the milled head, N, of this latter is divided to read direct to .01 mm. This divided head is of use in obtaining the correct position for viewing the profile of a screw thread. To effect this, the top of the thread is focused on the cross-wires of the ocular and the body is lowered by means of the fine adjustment an amount equal to the secant of the angle through which the screw is tilted on the stage multiplied by half the maximum diameter of the thread. Extremely large objects, such as milling cutters, hobs up to 23’’ diameter, etc., can be accommo- dated on the instrument by means of special arms attachable to the stage which holds adjustable male and female centres. Microscope, as above described, with 1} inch objective, cross-webbed ocular and complete set of chucks for carrying micrometer screws, small taps, Duty Free Duty Paid ete: invstronp: wooden! Case.)

v2) J ae S wn a; =| No. 32284 No. 31292 No. 31296 No. 31300 No. 31304 Ne. 31308 31284. Meat Chopper, useful for the preparation of meat for culture media. Leaves no meat in the machine and is easily cleaned. INIT OG hte tears Coes othg Se ene aC DOSE ETe 1 2 4 6 8 Wapacity bs. i.e ee cee ee laa sinew Sigs ecsie 4 1 2 3 4 BACH a srctavarekateweieve cictateraio ia fola avatolaress o'sta, 016) erevevera Sieicie.s 1.25 1.50 2.00 3.00 4.50 31288. Meat Cutter for Bagasse, etc., for cutting in preparation for laboratory analyses. With automatic feed giving shavings from 3th inch thick down to the thickness of thin paper.............. 8.00 pied ee eling Lont ube, Ciiel, of hard ip asso... 52 sok seis icicle ee eine ian al eet eele oraletelsisiarelcleyataie rae 1.00 31296. Mercury Trough, of porcelain, cross form, holding 3 kilos of mercury............. Seta aac he 75 31300. re s of porcelain. Wansertya Kilogier soererrrccee cystnesie it» cia heen nae eee eer eet seiiae ote 4 8 LOY heme 25 ae OS Sete eotic bis ac. 6 aR aeO CARE Anata BanBp. coda nporecceuit 1.00 2.00 31304. Mercury Still, Hulett, as used in the U. S. Bureau of Mines Experiment Station, Pittsburgh, Pa. See Bulletin No. 42 of the U. S. Bureau of Mines and Physical Review, Voi. 34, 1911, p. 307, consisting of flask of 500 ce capacity, with long neck and side tube, as illustrated, which is sealed to the outlet tube of a Drechsel wash bottle. The asbestos air bath, asbestos disc ‘‘S” tripod and burner, are not included in the price........ PRRs o oh ee onaanr nen bonde song Jaecegeotecsoder 3.00 31308. Mercury Still, Hulett, for electric heating. Glass parts only, without electric heater “‘B.”” See Bulle- TTUIND ee Of the Ue Se BUTEO Of MUNES nice ee ancl anes ineettee iste etelere owe Sarees cee s ac 5.60 Ey (Os (Met VAS 2S ¢ QO M Pea aN > ) ra a (ce v2) a0 | < METALLOGRAPHIC APPARATUS No. 31316 No. 31320 MICROSCOPE, METALLURGICAL, SAUVEUR-BAUSCH AND LOMB, latest model Handle Arm Type with lever fine adjustment, with rack and pinion for the raising and lowering of the stage so that focusing may be done without moving the vertical illuminator out of the optical axis of the illuminating system and also providing a much greater working distance for thick specimens. With circular revolving stage with large size opening (13 inches) in the center, for convenience in manipulating the Sauveur magnetic specimen holder. This is the most widely used microscope in metallurgical laboratories in the U. S. and the outfit as regularly supplied consists of Sauveur Metallurgical Stand; two oculars, 10X and 5X; three special metallographic objectives, i.e. short mounted and corrected for use without cover glass, of 32, 16 and 4mm e-/f.; vertical illuminator; two stage specimen holders, one magnetic and the other non-magnetic, and auxiliary tube, in polished case. 31312. Microscope, as above, without Sauveur Mechanical Stage..... Beocctoodt wo one ee eee 128.00 31316. Microscope, as above, with Sauveur Mechanical Stage as shown in illustration. Seonsnoscc este 150.00 MICRO-PHOTOGRAPHIC APPARATUS FOR METALLOGRAPHY, SAUVEUR-BAUSCH & LOMB. This outfit offers the advantage of a photo-micrographic outfit with microscope which may be removed for regular work on the table and instantly replaced in proper position on the outfit or mounted with the illuminant on one solid support with all adjustments. Supporting Stand—Of cast iron, neatly finished and very stable; has four supports with 23-inch lateral spread, provided with both castors and leveling screws; carries plate, 21x 7} in., at height of 22 in. from floor, to which plate are attached the optical beds. Optical Beds—Two in number, of lathe type, carefully planed, one accommodating supports for the microscope, are lamp with condensing system, table for macroscopic photography (of rail sections, etc.), and parts for lantern slide and transparent microscopic projection when these are desired. The other, graduated to 640 mm, carries camera and is attached to base plate by strong hinge joint, permitting the camera to be used in any position from vertical to horizontal. Illuminant—90 deg. hand feed are lamp for use with direct or alternating current, enclosed in a small cylindrical hood with observation windows, attached to rear of condensing mount; carbon adjustments so arranged as to be conven- iently reached from the observer's position either at the microscope or at the camera. Carbons may be adjusted either separately or together. : , ‘ 2 Condensing System—Triple condensing system with lenses 4} in. diam. in patent ventilated mount, which ts in turn mounted in a cylindrical metal hood, 9 in. long and 5 in. diam., in which the condensers may be easily adjusted to and fro with reference to the lamp; a cylindrical extension slips over the end of the hood and helps to render the apparatus more nearly light-tight; a spring clipis provided for holding filter screens. A green monochromatic screen is provided with the outfit as this has been found to be almost indispensable for the best photomicrographic work; entire illuminating apparatus is carried by a special fork and standard, adjustable for height and also to and fro on the optical bed, and provided with conveniently located adjustment screws for shifting its direction vertically or laterally. The lamp may also be tilted at an angle for transparent and for oblique illumination. Camera—Regularly supplied with camera for 5x7 in. plates and smaller, having a maximum bellows draw of 24 in., equipped with double plate holder with reducing kits for 4x 5 in. and 3} x 44 in. plates and a ground glass sereen with clear center; in adjustable mounting on two supports clamped to optical bed; front standard fitted with slid- ing light-tight tube to connect with microscope. A similar camera to take 4x5 and 3} x 4} in. plates can be sup- plied at a reduction of $10.00 in the price. We strongly recommend the regular 5 x 7 camera, however. Shutter—Automatic with steel leaves, having a maximum opening of 40 mm. may be set with instantaneous, bulb or time exposure. 31320. Micro-photographic Outfit, as above described, including Sauveur-Bausch & Lomb Metallographic Microscope No. 31316 with Mechanical Stage and 5 ampere rheostat for 110 volt circuit.. 310.00 31324. Micro-photographic Outfit, as above,for 220 volts................ 2... 2.0.52 sence ee ee eee ence 311.50 31328. ne s ‘s «" without Mechanical’ Stage... .22-.... 5. saceseeee eee eee 288.00 31332. G Ke Sig Ge <«f Microscapes .j2- 00 ¢ f.c ; Camera—Regularly supplied with horizontal camera for 5x7 in. plates and smaller, having a maximum bellows draw of 24 in., equipped with double plate holder with reducing kits for 4 x 5 in. and 3} x 4} in. plates and a ground glass screen with clear center; in adjustable mounting on two supports clamped to optical bed; front standard fitted with sliding light-tight tube to connect with metalloscope. A similar camera to take 4x5 and 3} x 4} in. plates can be supplied at a reduction of $10.00 in the price. We recommend the regular 5 x 7 camera, however. Shutter—Automatic with steel leaves, having a maximum opening of 40 mm may be set with instantaneous, bulb or time exposure. 31348. Micro-photographic Outfit, as described above, including three special metallographic objectives, 16 mm and 4 mm in long mounts and 32 mm in short mount, all corrected for use without covers; four oculars, two each of 6.4 and 10; vertical illuminator, two Sauveur specimen holders, one magnetic and one non-magnetic; inverted Metalloscope stand; camera with automatic shutter and pulley for controlling fine adjustment of microscope as above described, with 5 ampere rheo- stat for 110 volts and with Sauveur Mechanical Stage....................... ccc cece cece 345.00 31352. Micro-photographic Outfit, as above, with rheostat for 220 volts................ 0... ccc eee aes 346.50 31356. ee <8 « “s G without Mechanicalustarenseceeremer reece neces 323.00 SISO ROCUSSIN GG Lassen erie sie echt asia ais ove stv ena 's whe) a arer NST STSOT TS SERS Bis cep Pek over o7ors sho ounveyeteneyessromee 4.00 31364. Extra Carbons for lamp. Please state whether current is direct or alternating. Per 100........ 4.00 Note—If 4x 5 camera is preferred, $10.00 may be deducted from each of the above prices. 299 rial B&L.O.Ge, No. 31368—In position for use on a casting and with electric illumination METALLOGRAPHIC MICROSCOPE AND CAMERA, TASSIN-BAUSCH & LOMB, a portable outfit for the microscopical investigation of structural metals and other surfaces; particularly designed for the practical study of the forging, casting or bar as it is turned out rather than from specimens cut from the piece which must be taken to the laboratory for examination. The Tassin Apparatus consists essentially of three parts, the Microscope, the Illuminating Apparatus and the Camera. Microscope—The microscope is of Bausch & Lomb handle arm type. It has a large stage which is provided with leveling screws and forms the base of the instrument. The stage measures 119x 92 mm, with a distance of 41 mm from its center to the base of the arm. The effective length of the leveling screws is 36 mm. The object under exam- ination is viewed through a circular aperture in the stage, 31 mm in diameter. The stage, of course, may also be used in the regular way when the size of the specimen permits. The body tube, carrying the objective, il!uminatiag apparatus and ocular, is moved up and down by a rack and pinion adjustment for approximate focusing, ine exact focus being obtained by means of a fine adjustment of lever type with a milled micrometer head. A post with clamp is attached to the body tube so that the tube, after the focus has been obtained, cannot be forced down while attaching the camera, thus eliminating all risk of disturbing the focus or injuring the objective by forcing it down against the object. Illuminating Apparatus—At the lower end of the body tube is attached the illuminating apparatus, to which in turn is fastened a quick changing nosepiece, permitting a ready interchange of objectives. The illuminating apparatus shown in position in illustration, consists of a vertical illuminator and an arm, to the outer end of which is clamped an upright metal arm, carrying a condensing system in an adjustable tube, a metal shield and an illuminant attached at the rear of the shield. The illuminant may be either a 6-volt, 16 c.p. Mazda lamp or a small Acetylene burner, both of which are supplied with the complete outfit. The former illuminant is shown in illustration, the Mazda lamp being mounted in a metal hood attached to the shield by clips fitting over insulated lugs. : A resistance bank is supplied for use with the Mazda lamp to permit one to take current from either the regular 110- or 220-volt, direct or alternating circuit. This resistance bank is provided with six lamp sockets but is furnished without lamps. If it is desired to use th: Mazda lamp regularly supplied with a 110-volt circuit, either direct or alternating, the bank should be equipped with two 32 c. p. and 16 c. p. carbon lamps; if a 220-volt cir- cuit is to be used, the lamp should be fitted with five 32 c. p. carbon lamps. When acetylene is to be used, the burner 1s attached to the back of the shield by means of a rod and clamp. The gas may be supplied by a charged acetylene tank, as used on automobiles, or by the generator listed. : Within the vertical illuminator is an adjustable reflector of clear glass. Openings in the mounting permit the light from the illuminant to reach this reflector, which directs it upon the object. Adjustments are provided for centering the light properly. After the correct position has once been established, no further attention need be paid to the position of the light source since it travels with the body tube in focusing. Camera—The camera is of metal, 10 inches in length. It is provided with a focusing ground glass, two double plate holders for 3}x 34-inch plates and a small trap shutter. The front board is fitted with a draw tube which is inserted in the body tube of the microscope in place of the regular draw tube when making a negative. Two oculars are therefore desirable, one for each draw tube. —. The three objectives regularly supplied, i.e., the 32,16 and 8 mm, when used with a 7.5X ocular, will give magnifications of 30, 60 and 150 diameters, respectively. Since one may often wish to know, before leaving the job, what sort of negatives he has obtained and there may not be a dark room at hand, we provide a changing bag and a tank for daylight developing to meet this con- tingency. Any good orthochromatic plate may be used with any standard developer and fixing solution. Price list on following page. 300 Age JRo ot tne bi Ur OR H. TA rig OneMig TADS Ge Oy Mt PF AS UN ¥ _________TTTTEEEEEEEEEEEEEEEEEEEEEEEEeeeee 31368. Tassin Metallographic Equipment complete, as above, consisting of the following parts: special micro- scope stand; quick changing nosepiece with three rings; two eyepleces, 7.5 ; three objectives, 32, 16 and 8 mm; vertical illuminator; Tassin illuminating apparatus complete for acetylene; electric light attachment with Mazda lamp; resistance bank with cord, fuse block and connecting plug; Never Out Acetylene Generator No. 3 with six feet of rubber tubing; camera; 2 doz. Seed plates; hand magnifier; package of developing powders; focusing cloth; changing bag; carrying case TTUAN JAHRE 5 go BOs 6 SOC DORR OODEE GoD Coo ROMs ool bic Gann eT GG nb Cac Bone rna en Gna S aa eaam 122.00 31372. Special Microscope with stage 119x92 mm, with four leveling screws, rack and pinion and TGr time Hale mtOI cA Seeman bodaboneccocascundense ugds oo cop oeO a So OOOU OSE RCE aaonte 26.75 el s16qee QuickchancineiNOseplece with Ghee iNesin conics - sacs siete eae ceases wis oie ake elsleleseloie sieisicicis:s.s.s 7.00 STESTE GGA G Se Be. ot acd Obed cn OOO RO EEn ooo DERE ae ab manana cbic ADEE noi osocrte OOO TO reEEe 1.50 HRY | COOGAN GBR in i Sees en podaeser ce a aeencnocde os cdenccn ence SonrCon ceo OnSee So ae an Sonera 4.00 SEES. CONTRA ead imi rng oo bodoo accor re ORE MEO gcao So pia crc der aRaaaGnh Ge coo 40> doroec od gaan 5.00 SY6GRS OAECIING ETT satus ons SAO DOS BOOBIES BEeenGee ce OAeC ees c 50 OeetocesecaS Secae nee > Aas aeane 8.00 ie) ome WCLGICANONII MENEREMD A COR 103 cosas. scchn ya ecvd! Dw 4 a | eo) H. Le chie 206 MP Ay es CG (Ol OMe se avAL IN < MICROSCOPES AND ACCESSORIES The BH Microscopes are probably more widely used throughout the U.S. for stu- dents’ laboratory work than any other make or type of Microscope. No. 31604—BH2 No. 31616—BH8 with stage iris diaphragm with regular quick acting screw substage MICROSCOPE, BAUSCH & LOMB TYPE BH. This microscope is probably more widely used for students’ laboratory work in the U. 8. than any other make or type of instrument. It was the first Handle Arm Microscope with the modern adaptation of the lever fine adjustment and was such a pronounced suc- cess that the modification of the other instruments, BBH, CAH and DDH, rapidly followed. With the addition of a substage of the quick acting screw type, Abbe condenser, and iris diaphragm, the BH type is available for bacteriological and other work requiring the use of the oil immersion objective of 1.9 mm focus. This is designated as the BHS8. Body Tube—Provided with society screw thread; draw tube graduated in single millimeters with every tenth line numbered, adjustable in cloth lined sleeve, or in metal fitting if so specified, and provided with society screw thread for the use of low power objectives. Focusing Adjustment—Coarse adjustment by standard rack and pinion; fine adjustment of the Bausch & Lomb lever type with two-sized knurled head for slow and rapid movement, ceasing to operate when objective touches the slide. Stage of BH1 to 4—Of metal completely covered with vulcanized rubber, measuring 103x101 mm, with a distance of 59 mm from center to base of arm, provided with spring clips, an iris diaphragm so mounted as to be readily detached if desired and screw threads for attaching a substage ring to hold an Abbe condenser; iris diaphragm controlled by knurled ring, operated from any point of its circumference. Substage of BH8—Adjustable for focus by a quick-acting screw; consists of a mounting for the Abbe condenser and an iris dia- phragm, which comes into the plane of the stage when the screw is turned up as far as possible, allowing the condenser to be used in immersion contact with the slide; substage is swung to the left of the optical axis when screw reaches the limit of motion downward; iris diaphragm is automatically locked against closing when condenser is in position. Finish—Main parts including body tube in alcohol proof black, adjustment heads in yellow. Case—of hard wood with polished finish, fitted with brass lock and key. Objectives Outfit “Dry Oil Immersion Eyepieces Nosepieces Condenser”. pies 31600. BHI 16mm 4mm 7.5 X 27.50 31604. BH2 16mm 4mm (DOS Circular Double 31.50 31608. BH3 16mm 4mm Dex aclLOEX 29.00 31612. BH4 16mm 4mm 5x 10 Cireular Double 33.00 31616. BHS8 16mm 4mm 1.9mm 5X 10 X_ Circular Triple 1.20N. A. 70.00 Note—Microscopes BH1, BH2, BH3 and BH4 are furnished with a substage ring and Abbe condenser 1.20 N. A., in aniris diaphragm mounting at an additional cost of $7.50. The Abbe Condenser in the BH8 outfit is supplied in the regular quick acting Screw Substage. The above are the outfits regularly supplied. Prices on special outfits quoted on application. 304 ——— > ) = ae (cs nv a = Hy O) MA Ss CeO} IME aes ASIN < The BBHS8 Microscope is the standard throughout the U. S. for medical and other advanced laboratory work. No. 31640—BBH8 No. 31660—CAH8 with regular quick-acting screw substage with complete substage MICROSCOPE, BAUSCH AND LOMB TYPES BBH AND CAH. The BBH Microscope is the handle arm suc- cessor of the BB Microscope which was for many years the standard microscope throughout the United States for physicians’ use and for laboratory work in all advanced work. The CAH Microscope differs from the BBH only in size and having the complete substage and is recommended for the individual use of scientists doing more advanced work. Unless otherwise stated the following specifications apply to both types. Body Tube—Outside diameter, 39 mm; provided with society screw thread; standard size eyepieces are used; draw-tube graduated in single millimeters with every tenth line numbered, adjustable in cloth-lined sleeve, or in metal fitting, if so specified, and provided with society screw thread for the use of low power objectives. Focusing Adjustment—Coarse adjustment by standard rack and pinion; fine adjustment of Bausch & Lomb lever type with double knurled micrometer screw head for slow and rapid movement, the larger part graduated into 100 divisions, each equal to .0025 mm in vertical movement, and provided with a hinged indicator, which may be turned back from the head; fine adjustment ceases to operate when objective touches the slide. Stage—of BBH—of metal, covered with vulcanized rubber; measures 120 x 107 mm, with a distance of 70 mm from its center to base of arm; provided witb spring clips. Stage—of CAH—as above, measures 125 x 115 mm; with a distance of 75 mm from its center to base of arm. Substage—of BBH—adjustable for focus by a quick acting screw; consists of a mounting for the Abbe condenser and an iris dia- phragm, which comes into the plane of the stage when the screw is turned up as far as possible, allowing the condenser to be used in immersion contact with the objective, if desired; substage is swung to the left of the optical axis when screw reaches the limit of motion downward. Substage—of CAH—complete with swing-out condenser of Bausch & Lomb new construction, and arranged to take all the substage accessories; adjustable by standard rack and pinion; upper iris diaphragm of dome shape, self-locking, combined with Abbe condenser, the whole easily removable from substage; Abbe condenser removable from optical axis by a double swing movement to one side, releasing upper iris diaphragm for use; lower iris diaphragm adjustable laterally by rack and pinion for oblique illumination, revolvable about its own axis and mounted on a swinging arm allowing it to be swung entirely out of the optical axis. Finish—- Main parts including body tube in alcohol proof black, adjustment heads in yellow Cases—Of hard wood with polished finish; fitted with brass lock and key. Objectives — = Abb Outfit Dry Oil Immersion _ Eyepieces ; Nosepieces Ganieuser Price 31620. BBHI1 16mm 4mm oR 41.50 31624. BBH2 16mm 4mm Tox Circular Double 45.50 31628. BBH3 16mm 4mm Se UDSX : 43.00 31632. BBH4 16mm 4mm 5X 10x Circular Double 47.00 31636. BBH6 16mm 4mm 5X 10X Circular Double 1.20N.A. 54.50 31640. BBHS8 16mm 4mm 1.9mm 5X 10> Circular Triple 1.20N. A. 80.00 31644. CAHI 16mm 4mm (ay >< 1.20N. A. 76.00 31648. CAH2 16mm 4mm (flit>< Circular Double 1.20N.A. 80.00 31652. CAH3 16mm 4mm 5X 10X ? 1.20N.A. 77.50 31656. CAH4 16mm 4mm 5x 10 Circular Double 1.20N.A. 81.50 31660. CAHS8 16mm 4mm 1.9mm 5X 10X_ Circular Triple 1.20N. A. 110.00 Note:—The new swing-out mounting for the Abbe Condenser with upper and lower iris diaphragms, is substituted for the regular one in the BBH6 and BBHS outfits at an additionai cost ef $5.00. When ordering this mounting, please specify ‘‘screw sub- Stage with swing-out condenser.” 305 No. 31680—DDHS8 with Revolving Mechanical Stage and Complete Substage MICROSCOPE, BAUSCH AND LOMB TYPE DDH. This is the largest and most elaborate of the Bausch and 31664. 31668. 31672. 31676. 31680. 31681. Lomb Handle Arm series and is particularly designed for advance research work, photo-micrography, etc. Pillar—Double rectangular in section, provided with inclination joint and clamping lever to secure the instrument in any position and with stops in the vertical and horizontal positions. Body Tube—Of aluminum, 50 mm outside diameter; provided with society screw thread; standard size eyepieces are used; draw tube graduated in single millimeters with every tenth line numbered, adjustable in cloth-lined sleeve, or in metal fit- ting, if so specified, and provided with a society screw thread; lower collar may be removed for attaching the Micro- Tessar, 72 mm objective. a Focusing Adjustment—Coarse adjustment by standard rack and pinion; fine adjustment of Bausch & Lomb lever type with micrometer screw head in two parts for slow and rapid movement, the larger graduated into 100 divisions, each equal to .0025 mm. in vertical movement, and provided with a hinged indicator, which may be turned back from the head. Stage—Revolving mechanical, with circumference graduated into single degrees and read by a convenient vernier; measures 126 mm outside and 112 mm inside the graduations; provided with two rack and pinion movements, covering a range of 75 mm and 35 mm, respectively; provided with centering screws and removable for substitution of plain stage, if desired, or upper part may be removed, leaving a large, flat surface with one rack adjustment. Substage—Complete with swing-out condenser and so arranged that all substage accessories, inserted into the upper sleeve, may be easily employed; adjustable by standard rack and pinion; upper iris diaphragm of dome shape, self locking, com- bined with Abbe condenser, the whole easily removable from substage; Abbe condenser removable from optical axis by a double swing movement to one side releasing upper iris diaphragm for use; lower iris diaphragm adjustable laterally by rack and pinion for oblique illumination, revolvable about its own axis and mounted on a swinging arm, allowing it to be swung entirely out of the optical axis. Finish—Main parts, including body tube, in alcohol proof black; adjustment heads and buttons in yellow. Case—Of hardwood with polished finish; fitted with brass lock and key. Objectives Outfit Dry Oil Immersion F Eyepieces Nosepieces cates Price DDHI1 16mm 4mm Uetiip-< 1.20N. A. 1381.00 DDH2 16mm 4mm Ueto Circular Double 1.20 N. A. 135.00 DDH3 16mm 4mm 5X 10X 1.20N. A. 182.50 DDH4 16mm 4mm 5x 10 Cireular Double 1.20N. A. 136.50 DDH8 16mm 4mm 19mm 5X 10 X _ Circular Triple 1.20 N. A. 165.00 Plain Vulcanite Stage for DDH, interchangeable with the Revolving Mechanical Stage. 15.00 306 > ve) ce a S wa ae 4 au 1e) M A _ S§& SO lis MEN N Y4 The F and FF Microscopes embody all the advantages of the Lever Fine Adjustment combined with the Curved Arm. No. 31696-F4 No. 31700-FF8 with stage iris diaphragm with regular quick-acting screw substage MICROSCOPE, BAUSCH & LOMB CURVED ARM TYPE F & FF. This Microscope is the latest development of the handle arm type with lever fine adjustment and is preferred by many to the BH type because of the facility and safety with which the arm of the microscope may be grasped by the whole hand and because of the large amount of space available for manipulation of the object on the stage. Body Tube—Provided with society screw thread; standard sized eyepieces are used (23 mm diam.); draw tube graduated in single millimeters with every tenth line numbered, adjustable in cloth lined sleeve or in metal fitting, if so specified, and pro- vided with society screw thread for the use of low power objectives. Focusing Adjustment—Coarse adjustment by standard rack and pinion, provided with stop to prevent pinion from overriding rack; fine adjustment of Bausch & Lomb original lever type with two-sized knurled head for slow and rapid movement, ceasing to operate when objective touches ‘the slide; adjustment head locked to prevent removal; all parts of fine ad- justment thoroughly dust-proof. Stage—of metal, completely covered with vulcanized rubber except at point of attachment; measures 102x 102 mm, with a dis- tance of 76 mm from center to arm at stage surface (distance from optical center to extreme inner curve of arm, 85 mm); provided with spring clips. In the F1 to F4 outfits the stage is provided with an iris diaphragm with mount having screw threads for attaching a substage ring to hold an Abbe condenser; iris diaphragm controlled by knurled ring, operated from any point of its cireumference; stage attached to arm on broad bearing surface to insure maximum rigidity. Finish—Main parts including body tube in alcohol proof black, adjustment heads in yellow. Case—Of hard wood with polished finish; fitted with brass lock and key. Substage—of FF6 and FF8—adjustable for focus by a quick-acting screw; consists of 4 mounting for the Abbe condenser and an iris diaphragm, which comes into the plane of the stage when the screw is turned up as far as possible, allowing the con- denser to be used in immersion contact with the slide; condenser is provided with iris diaphragm beneath, thus giving two iris diaphragms with equipment; sub-stage is swung to the left of the optical axis when screw reaches the limit of motion downward; iris diaphragm is automatically locked against closing when condenser is in position. Objectives nee Outfit Dry OilImmersion Eyepieces Nosepieces Condenser Price 31684. Fl 16mm 4mm 7.5 X 27.50 31688. F2 16mm 4mm 7.5 X Circular Double 31.50 31692. F3 16mm 4mm 5S LOX 29.00 31696. F4 16mm 4mm 5X 10x Circular Double 33.00 31698. FF6 16mm 4mm 5x 10 xX Circular Double 1.20 N. A. 41.00 31700. FF8 16mm 4mm 1.9mm 5X 10X_ Circular Triple 1.20 N. A. 65.00 Note—Microscopes F1 to F4 can be furnished with a substage ring and Abbe condenser, 1.20 N. A. in an iris diaphragm mounting at an additional cost of $7. 50. In the FF6 and FFS outfits the sub- stage furnished is the regular quick-acting screw type. The above are the outfits regularly supplied. Prices on special outfits quoted on application. 307 > a These Microscopes offer the combined advan- tages of the Lever Fine Adjustment with the Side Wheel and Curved Arm No. 31708 FS2 No. 31724 FFS8 with stage iris diaphragm with regular quick acting screw substage MICROSCOPE, BAUSCH & LOMB CURVED ARM TYPE FS AND FFS with Lever Side Wheel Fine Adjust- 31704. 31708. 31712. 31716. 31720. 31724. ment. This is a new microscope with side fine adjustment of the lever type, which is here used in conjunction with the curved arm made by Bausch & Lomb for many years. The principle is that of their original lever type of fine adjustment which has met the test of time and has been very generally adopted. The construction is simple and durable, giving a delicate movement for work with the high- est powers, yet rapid enough for the lower powers. ‘There is absolutely no tendency to wedge, and the adjustment has been tested in a manner equivalent to many years of use without showing wear or lost motion. This adjustment produces a vertical movement of the body tube of 0.25 mm for every com- plete rotation of the heads. It canbe operated from either the right or left side of the arm, a turn of the fine adjustment heads always moving the body tube in the same direction, up or down, as a correspond- ing turn of the coarse adjustment heads. Positive stops denote the upper and lower limits of motion, and the adjustment ceases to operate when the objective comes in contact with the slide. An auto- matic take-up for wear is provided. Body Tube—Provided with society screw thread; standard size eyepieces are used (23 mm diam.); draw tube graduated in single millimeters with every tenth line numbered, adjustable in lined sleeve or in metal fitting, if so specified, and provided with society screw thread. ; y Focusing Adjustments—Coarse adjustment by standard rack and pinion; fine adjustment of the lever type, with micrometer head on each side of arm; one complete revolution of the micrometer heads produces a vertical movement of the body tube of 0.25 mm. Stage—Of metal, completely covered with vulcanized rubber except at point of contact with arm; measures 102x102 mm, with a distance of 76 mm from center to arm at stage surface (distance from optical center to extreme inner curve of arm, 85 mm); provided with spring clips. In the FS1 to FS4 Outfits the stage is provided with an iris diaphragm with mount having screw threads for attaching a substage ring to take an Abbe Condenser; the iris diaphragm being ccntrolled by a knurled ring operated from any point of its circumference. With mechanical stage No. 32508 the entire surface of a slide, 50x75 mm, can be examined. : ~~ Substage of FFS6 and 8—Adjustable for focus by a quick-acting screw; consists of a mounting for the Abbe condenser and an iris diaphragm, which comes into the plane of the stage when the screw is turned up as far as possible, allowing the condenser to be used in immersion contact witn the slide; substage is swung to the left of the optical axis when screw reaches the limit of motion downward; iris diaphragm is automatically locked against closing when condenser is in position, or against inserting condenser when upper iris is closed. oe ; Mirror—Plane and concave, 50 mm in diameter; adjustable in two planes in a fork, mounted on a swinging arm provided with a stop for central illumination. Finish—Lower parts, arm and body tube in elon black; other parts in yellow. Case—Of hard wood with polished finish; fitted with brass lock and key. Objectives He ee ate A Outfit Dry Immersion Eyepieces : Nosepiece Condenser Price FS1 16 mm, 4mm 7.5 xX 30.00 FS2 16 mm, 4mm 7.5 x. Circular Double 34.00 FS3 16 mm, 4mm 5x 10x 31.50 FS4 16 mm, 4mm 5x 10x Circular Double 35.00 FFS6 16 mm, 4mm 5x 10x Circular Double 1.20 NA 43.50 FFSS8 16 mm, 4mm 1.9 5x 10x Circular Triple 1.20 NA 67.50 Note.—Microscope FS1 to FS4 can be furnished with a substage ring with Abbe Condenser of 1.20 NA at an extra cost of $7.50. Outfits FFS6 and FFSS8 are provided with regular quick acting screw substage. 308 > nD 4 rae, e WD ae 4 at" fe) = > Wn (@) ° = U > rz < These Microscopes offer the combined advantages of the Lever Fine Adjustment with the Side Wheel and Curved Arm. BRLO.GS No. 31744 CAS8 No. 31764 CCS8 With Complete Substage With Complete Substage MICROSCOPES, BAUSCH & LOMB CURVED ARM TYPES CAS AND CCS with Lever Side Wheel Fine Ad- justment. These models are of the size and general construction of CAH and CCH and combine with these features the curved arm with lever side wheel fine adjustment as introduced in types FS and FFS. Base and Pillar—Same as in CAH. Arm—Long curved form of rectangular cross section with rounded edges. Body Tube—Same as in CAH. Focusing Adjustment—Coarse adjustment by rack and pinion; fine adjustment of new side wheel lever type with micrometer head on each side of arm, with drums graduated to read single microns of vertical movement. Index lines are provided on side of arm to show upper and lower limits of fine adjustment range. Stage of CAS OE metal covered with vulcanized rubber, 125 x 115mm witha distance of 87 mm from center to baseof arm. With spring clips. Stage of CCS—Circular revolving, 125 mm diameter, with vulcanite top, centering screws and spring clips. Distance from center of stage to base of arm 87 mm. Interchangeable with large revolving mechanical stage. Substage—Complete substage equipment with Abbe Condenser, as supplied with CAH, DDH, DHS, ete. Finish—Main parts, including body tube, in alcohol proof black. Adjustment heads in yellow lacquer. Case—Of hardwood with polished finish. With brass lock and key. Objectives Abbe Outfit Dry Oil Immersion Eyepieces Nosepieces Condenser Price 31728. CAS1 16mm 4mm 7.5X 1.20 N. A. 72.00 31732. CAS2 16mm 4mm 7.5X Circular Double 1.20 N. A. 76.00 31736. CAS3 16mm 4mm 5X 10X 1.20 N. A. 73.50 31740. CAS4 16mm 4mm 5x 10 Circular Double 1.20 N. A. 77.50 31744. CASS8 16mm 4mm 1.9mm 5x 10 _ Circular Triple 1.20 N. A. 106.00 31748. CCs1 16mm 4mm 10X 1.20 N. A. 82.00 31752. CCS2 16mm 4mm 10x Circular Double 1.20 N. A. 86.00 31756. CCS3 16mm 4mm 5x 10X 1.20 N. A. 83.50 31760. CCS4 16mm 4mm 5x 10 Circular Double 1.20 N. A. 87.50 31764. CCS8 16mm 4mm 1.9mm 5X 10X _ Circular Triple 1.20 N. A. 116.00 309 No. 31784—DDSS8 With Revolving Mechanical Stage and Complete Substage MICROSCOPE, BAUSCH & LOMB CURVED ARM TYPE DDS with Lever Side Wheel Fine Adjustment. This Microscope is in size and finish identical with DDH but is here combined with the curved handle arm and lever side wheel fine adjustment previously introduced in FS and FFS. This Microscope, like the DDH, is provided with large body tube for photo-micrography and large revolving mechanical stage and is particularly designed for advanced work in research. Base—Horse-shoe form; extra large. Pillar—Doubie rectangular in section; provided with inclination joint and clamping lever to secure instrument in any position, and with stops in the vertical and horizontal positions. Arm—Long, curved form, providing maximum space for manipulation of object. Body Tube—Of brass, 50 mm outside diameter; provided with society screw thread; standard size eyepieces are used; draw tube graduated in single millimeters with every tenth line numbered, adjustable in cloth-lined sleeve, or in metal fit- ting, if so specified, and provided with a society screw thread; lower collar may be removed for attaching the Micro- Tessar, 72 mm objective Focusing Adjustment—Coarse adjustment by rack and pinion; fine adjustment of lever type, with micrometer head on each side of arm, one with drum graduated to read 2} microns of vertical movement of body—index lines are provided on side of arm to show upper and lower limits of fine adjustment range Stage—Large mechanical, with centering heads; revolvable with clamping device to prevent rotation when desired; diameter 125 mm with a distance of 87 mm from its center to the base of arm, provided with two rack and pinion movements, covering a range of 75 mm and 50 mm respectively to make possible the examination of 3 in. x2 in. slide from corner to corner; upper part of stage may be removed, leaving a large flat surface with one rack movement; entire mechanical stage re- movable for substitution of a plain revolvable stage. Substage—Complete with swing-out condenser and so arranged that all substage accessories, inserted into the upper sleeve, may be easily employed; adjustable standard rack and pinion; upper iris diaphragm of dome shape, self-locking, combined with Abbe condenser, the whole ily removable from substage; Abbe condenser removable from optical axis by a dou- ble swing movement to one side, releasing upper iris diaphragm for use; lower iris diaphragm adjustable laterally by rack and pinion for oblique illumination, revolvable about its own axis and mounted ona swinging arm, allowing it to be swung entirely out of the optical axis Mirror—Plane and concave, 50 mm in diameter; adjustable in two planes in a fork, attached in fixed position to substage support. Finish—Main parts, including body tube, in alcohol proof black; adjustment heads in yellow. Case—Of hard wood with polished finish; fitted with brass lock and key. Objectives pee Outfit Dry Oil Immersion Eyepieces Nosepieces Condenser ____ Price DDSI 16mm 4mm maoxX 1.20 N. A. 120.00 DDS2 16mm 4mm Tox Circular Double 1.20 N. A. 124.00 DDS3 16mm 4mm opal OD< 1.20). Ne As 121.50 DDS4 16mm 4mm 5x 10 Circular Double 1.20 N. A. 125.50 DDS8 16mm 4mm 1.9mm 5x 10x _ Circular Triple 1.20 N. A. 154.00 310 No. 31804—BHPS in Case No. 31808 MICROSCOPE, BAUSCH AND LOMB PORTABLE TYPE BHP. This microscope is of the same general con- struction as the BBH but with folding stage and base to permit of convenient insertion in a small carrying case. It has been widely used for field work notably by the Rockefeller Sanitary Commis- sion for the Eradication of the Hookworm to which we have supplied many instruments. Base—V shaped, with hinge to permit parts to be folded together; stable with microscope at full inclination. - Focusing Adjustment—Coarse adjustment by standard rack and pinion; fine adjustment of Bausch & Lomb lever type with double knurled micrometer screw head for slow and rapid movement, the larger part graduated into 100 divisions, each equal to .005 mm in vertical movement, and provided with a hinged indicator, which may be turned back from the head; fine adjustment ceases to operate when objective touches the slide. ; Stage—Of blackened metal, with vulcanized rubber top, measures 98 x 88 mm with a distance of 58 mm from its center to base of arm; provided with spring clips, mounted on a joint with clamp, permitting it to be turned in a vertical position for placing it in case and yet to be rigid when in a horizontal position for use. : Substage—Adjustable for focus by a quic ting screw; sists of a mounting for the Abbe condenser and an iris diaphragm, which comes into the plane of the s hen the screw is turned up far as possible, allowing the condenser to be used in immersion contact with the objective, if desired; substage is swung to the left of optical axis when screw reaches the limit of motion downward. Finish—Main parts including body tube in alcohol proof black, adjustment heads in yellow. Case—Of hard wood with polished finish; fitted with brass lock and key; outside dimensions, 284 x 192 x 83 mm (11} x 7x 3% in.). Weight—In carrying case, 10 Ibs., 15 ozs. Objectives Abbe Outfit Dry OilImmersion Eyepieces Nosepieces _ : _Condenser Price 31800. BHP4 16mm 4mm 5 Se 0x< Circular Double - 56.50 31804. BHPS 16mm 4mm 1.9 mm 5x 10x Circular Triple 1.20 N.A. 92.50 MICROSCOPE, BAUSCH AND LOMB DEMONSTRATION TYPE O. This instrument enables an instructor to supplement his lecture work by showing a single object to an entire class. He has only to adjust the slide, focus the instrument and pass it around the class, the students pointing it to the light to make the observations. We have supplied this instrument also to a number of industrial establish- ments, such as manufacturers of safety razor blades for the convenient examination by workman of delicate parts during manufacture. Arm—Handle type, of ample size. c y : r Stage—Of blackened metal, 100x 83 mm, giving a distance of 42 mm from its center to arm, provided with spring clips and with _ small posts underneath to hold the instrument in a Vertical position when not in use. _ Focusing Adjustment—Body tube slides in a cloth-lined spring tube; when properly focused, it may be secured by a small set screw above the handle. A P ; e Body Tube—Fixed length, 160 mm; provided with society screw for regular miscoscope objectives; standard sized eyepieces are used. 2 pe Outfit Objectives Dry Eyepieces Price | ~ 31808. oO 7.5 X 6.00 31812. oO: 16 mm (is DK 11.00 311 Ne. 31816—With paired objective in position No. 31824—With body tube arranged horizontally No. 31824—With body tube arranged vertically MICROSCOPE, BAUSCH & LOMB BINOCULAR, with image erecting prisms, paired oculars and objectives. 31816. 31820. 31824. 31828. 31832. The body tube with prisms is similar to that used in the Zeiss Binocular and the eye-pieces are ad- justable for inter-pupilary distance. The base is readily removable as is the glass part of the stage in which arrangement the instrument may be used for a variety of purposes. The distinct improve- ment in this model is in the construction of the arm which permits the detaching of the curved portion from the sliding piece which carries the rack and also from the body tube proper. These features permit the quick increasing or decreasing of the working distance and also the almost universal applica- tion of the binocular body when used in connection with the large preparation stand and support. The stand for large preparations consists of a heavy base of horse-shoe form with a removable wooden stage. Microscope, Binocular, as above, stand only with hand rests but without oculars or objectives, in (CTS a EIA Re rE Ia 5.55.5 pion AEM RPEOO eRe odocuSGnpUacASHoacoonNsosceSs 45.00 Support for Large Preparations, without binocular body tube...................--. 2000-2 eeeeee 18.00 ae es s : with binocular body tube, without objectives or oculars but with case for binocular bod y tubes... 55 cocueee Ciera siete cists lass. o\cs00y0 ciel oe Seis siete elite eee eee 53.00 Paired Objectives, for Bausch & Lomb Binocular Microscope. Hquivalent focus mim -see electorate 55 48 40 32 25 [OEY dl es See oc Ua Sec San are ot Gaps Cao caanE 11.00 11.00 12.00 12.00 12.00 Paired Oculars, for Bausch & Lomb Binocular Microscope. Power FS specei ode 2 Ae cts eer ols 5X 6.4 x USD S< 10% ~ 1225px% Hguivalentsfocus pmmvepes ts eee eee rere 50 40 33 25 20 achicha eee earner cee siege sees 3.00 3.00 3.00 3.00 3.00 Nee lee ei TR liale fe One MALS CAO. iM. PE aA Nea NEW BAUSCH & LOMB MICROSCOPES AND ACCESSORY APPARATUS which were not ready for announcement at the time our catalogue went to press. Microscope, Bausch & Lomb New Portable Type PS, as originally designed for field use by the International Health Commission in their work in the tropics. The fine ad- justment is of the new side wheel lever type with micrometer head on each side of arm and exactly as described for Micro- scopes FS, FFS, etc. (see page 308). ‘Lhe stage remains in a horizontal position when the Microscope is put in the case, is cov- ered with vulcanized rubber and measures 92 x 76 mm with a distance of 62 mm from center to base of arm. In the No. 8 outfit the regular quick acting screw substage with Abbe condenser and iris diaphragm is provided. Outfits APS 1, 2, 3 and 4 are not provided with the substage and Abbe condenser. ‘They ean be fitted with a sub- stage ring with Abbe condenser and lower 1 diaphragm at an additional cost of $7.50. The two arms of the base fold in- ward on their own centers in the position as shown in illustration when the Micro- scope is put into the case. The weight of the No. 8 outfit, complete in polished hard- wood case as shown in illustration, is 9 lbs., 8 oz., and the external dimensions of the case are 113 x 62 x 4} inches. No. 31794 Objectives Age Outfit Dry =, ~ Oil Immersion Eyepieces Nosepieces Geutlenees Price 31786. APS 1 16mm 4mm 1.0% 27.50 31788. APS 2 16mm 4mm TWEE Circular Double 31.50 31790. APS 3 16mm 4mm ioe (0) 3% 29.00 31792. APS 4 16mm 4mm aye iK0) sx Cireular Double 33.00 31794. APS 8 6mm 4mm 1.9 mm Dx) LOR Circular Triple 1.20 N. A. 70.00 Microscope, Bausch & Lomb New Portable Type BPS. This Microscope differs principal- ly from the preceding Type AVS in that the folding base is provided with a hinged heel giving additional stability to the Microscope at full inclination and fold- ing under when the Microscope is not in use. The stage also folds {rom the horizontal position as in use to the ver- tical position, as shown in the illustra- tion, when the Microscope is put in the case. It is also covered with vulcanized rubber and measures 88 x 88 mm with a distance of 70 mm from center to base of arm. ‘The side wheel fine adjustment is of the lever type previously described and the finish and other construction identical with other Bausch & Lomb standard Microscopes. The particular feature of this equipment is the small size of the case, i.e., 11} x 7} x 3} inches, and the light weight of the complete No. 8 outfit, 10 lbs. 5 oz. No. 31798 Objectives we re en e Outfit Dry Oil Immersion Eyepieces Nospepieces Condenser ‘ad _ Price 31796. BPS 4 16mm 4mm 5x 10x Circular Double 56.50 31798. BPS 8 16mm 4mm 1.9 mm 5x 10x Circular Triple 1.20 N. A, 92:50 Sup. Al—10-14 olla No. 3i834a No. 31835b Microscope, Bausch & Lomb New Binocular Type KC. consisting of binocular body KA with support arm mounted on a special support to clamp on the edge of table. As designed by Prof. J. H. Schaffner, of Ohio State University, for the observation of herbarium sheets. The advantages of this type of sup- port for zoological work have been promptly recognized and the instrument is, therefore, offered com- plete with new support, and new support only for those who are already provided with the KA Binoc- ular Microscope. The dimensions of the arm permit for working distance up to 195 mm, measuring from the lower edge of the nosepiece to table top. The optical equipment of tubes, ete., is identical with Binocular KA. For additional paired oculars and objectives for use with the binocular tube see page 312. 31834. Clamp Stand KC 1, with Microscope body KA without objectives or eyepieces but with case for body. .. sar : poner _ 40.00 31834A. Clamp Stand KC 3, same as above but with paired objectives, 40 mm, and paired eyepleces 10 x 55.00 31834B. Clamp Stand KC only............ sanaae ima COU. 31834C. Glass Plate, heavy, squa ire, With ground edges, 300)x/300smm. oS eee ee eee eee tga edn Microscope, Bausch & Lomb New Portable Binocular Type KP. This is a ‘binocular of the Greenough type exactly as described on page 312 but specially arranged for portability in that the binocular body and stage are completely detachable from the base which is provided with folding arms as in Portable Microscopes APS and BPS. An extraordinary range of working distance up to 155 mm is provided for measuring from the lower edge of the nosepiece to the stage and the entire supporting arm with body tube can be removed and used on Binocular Microscope Stand KB described on page 312, so that with one set of body tubes both a portable and laboratory outfit of this type KB is possible. The stage is of metal with large rectangular aperture provided with two remoy able plates 80 x 95 mm, one of metal and the other of tr ansparent glass. The metal stage is provided with a metal plate ‘allowing either clear aperture, white opaque, black opaque or ground glass illumination or background. The No. 5 outfit in carrying case weighs 11 Ibs., 12 oz. and the case measures 9 x 13 x 33 inches. Outfit Paired Objectives Paired Eyepieces Price 31835. KP 1 40 mm 10 x 67.50 31835A. KP 3 48mm 32mm 6.4x 10x 81.50 31835B. KP 5 55mm 40mm 24mm nse (ea) sx 10 x 96.50 No. 31993 No. 32139 31993. | Comparison Eyepiece, Bausch and Lomb, as suggested by Dr. Daniel J. Healy, of the Kentucky Agri- cultural Experiment Station, for the observation of two different objects side by side in the same field. The field is div ided horizontally into halves as in the original form after Van Heurek in 1886 for comparing diatoms. Any two Microscopes with regular size draw tubes may LISO Ge. eseicie staaaias Alaaiet ane Rees UE ee eee divteleys os dow eye Ale ee eee 312b Deen to mH 3i0! AR Hehe oe ORM AS CeO} IME SP AvaNe o 5Y 31994. Pointer Eyepiece, 10 x, with pointer for indicating special features in the field. Pointer is controlled byzarsmalllrexternall lever\ 25 nsdn crcervecisc nas oem eee : 2.75 31995. Diaphragm, with projecting hair, for use with above, as suggested by Dr W.J.G. L and, of the Univer- sity of Chicago. May be also inserted in any regular sté andard eyepiece 50 32139. Vertical Mluminator, with two small square mirrors in place of the usual plane glass re lector and with a side tube carrying a condensing lens adjusted for focusing at light source. Two sizes of lenses are provided for interchangeable use, one for high and the other for low powers 12.00 No. 31835H No. 24900 Microscope, Bausch & Lomb New Binocular Type KD, consisting of binocular body tube KA of the Greenough type with a special prism system added which makes possible the use of any of the achromatic objec- tives up to 1.9 mm oil immersion. When a single objective is used one image merges with the other and the subject is seen erect and not transposed. Stereoscopic effect is obtained by suitable adjust- ment of the pupillary distance. The removal of the prism system with nosepiece and regular achro- matic objectives as shown in illustration permits the use of the same stand and body tubes with the regu- lar paired objectives as supplied with Binocular Microscope KA. The focusing adjustment is of the side wheel lever type and the stage measures 102 x 102 mm with distance of 85 mm from center of arm at stage surface. Finish and construction otherwise identical with Bausch & Lomb standard. For prices of paired objectives used on this stand see page 312. Objectives — Paired Abbe Outfit Dry Oil Immersion Eyepieces Nosepiece Condenser Price 31835C. KD TEORX: 78.00 31835D. KD1 16mm 4mm Lisi) >< 91.00 31835E. KD 2 16mm 4mm TAD Cireular Double 95.00 31835F. KD 3 16mm 4mm Dax Oks 94.00 31835G. KD 4 16mm 4mm 5x 10x Circular Double 98.00 31835H. KD 8 16mm 4mm 1 9hmm) = 5x LORE Cireular Triple 1.20 N. A. 134.00 24900. Color Comparison Microscope, Bausch & Lomb, as suggested by Albert S. Osborn for the examination of questioned documents but useful for a great variety of other comparison work both with and without the use of Lovibond tint glasses for the determination of color values. This Microscope is regularly furnished with two 48 mm objectives and one 10 x Ramsden eyepiece. The fine adjustment is provided at the nosepiece by the rotation of a milled ring. The Lovibond or other standard tint glasses are inserted in the slots in the body tube and are not included in the price of the outfit......... : 2. Stee, ae cea eee .. 55.50 312¢ No. 31309 Microscope, Metallurgical, Bausch and Lomb New Type AM. This Microscope is of the general type of the F 31309. 31310. 31269. 31270. 33072. 31974. 32870. 32065. 32066. model but is provided with a focusing stage and a special arm for convenient use in metallurgical work. The design is that of Dr. Albert Sauveur, of Harvard University, and the Microscope is provided with regular vertical illuminator No. 32136. The objectives listed are those in regular mounts. If desired in special short mounts $1.00 extra for each objective is added. Objectives Vertical Outfit Dry Eyepieces Illuminator Price AM 1 16mm 4mm T2DEX No. 32136 49.50 AM 2 16mm 4mm 5x 10x No. 32136 51.00 Microscope, Measuring, Bausch & Lomb, for reading the rate of fall of the leaf of an electroscope, the height of a mercury column, or for any other readings where precision is required. With 32 mm achromatic objective and Ramsden ocular giving a magnification of 20 diameters. The ocular is provided with a 12 mm scale graduated in tenths of a millimeter with every millimeter line longer than the rest and numbered.. ees AL Microscope Tube, only, for above, without adjustable base or rack and pinion focusing adjustment. 15.00 Micro Slide Cabinet, Bausch & Lomb, exactly as described under No. 33072 on page 336 but holding 6000 slides, consisting of 300 trays in three tiers, with two glass paneled doors. Dimensions 98 em high, 86 em wide and 34 em deep Pe 6 Sooo sens 125.00 Objective, Bausch & Lomb New 1.9 mm Immersion. This is a new system ai tk 32 N. A. in which a considerable reduction of the secondary spectrum, and with this a greater refinement in defini- tion, has been secured. It has a working distance of 0.13 mm and micrometer value with a 6.4 x eyepiece of 0.0016 = 1.5 u tbe k whe ew eaitine cee ee ee ee . 35.00 Micro Lamp, Bausch & Lomb New Tungsten Electric. This is exactly wires in appearance oad mmethed of mounting to the Nernst Lamp listed on page 331 under No. 32868 which, with the announce- ment of the new Tungsten, has been discontinued. This lamp is furnished with frosted globe and furnishes a light sufficient for regular microscopic work as well as for dark ground illumi- nation. For either 110 or 220 volts alternating or direct current. Please specify voltage in ordering. Qn‘adjustable stand with cord and plug. ......-.-....---.--.)- 8 eae 5.00 Ocular Micrometer Disc, ruled to 5 mm in 0.05 mm divisions with every nee line numbered. 1.50 Ocular Micrometer Disc, ruled to 10 mm in 0.1 mm divisions with every tenth line numbered.... 2.00 ‘ 312d ——— MICROSCOPE, BAUSCH AND LOMB CHEMICAL TYPE M. 31836. 31840. 31844. 31848. 31852. 31856. No. 31852 No. 31844 No. 31848—Showing base opened Constructed after the specifications of Dr. E. M. Chamot of Cornell University, and is designed for work in all branches of Micro-Chemistry and in com- mercial laboratories, being admirably adapted for the examination of foods and drugs as well as chem- icals. High power objectives may be used with it, but a small cover glass should be cemented with pure glycerine to the front of even low powers to prevent damaging from contact with reagents. Bausch & Lomb quick changing nosepiece is regularly listed with this instrument, as it is desirable under ordinary conditions to have but one objective on the stand at once. The instrument is of the Handle Arm Type with lever fine adjustment similarin appearance to the BBH except for the revolving stage. Stage—Circular revolving with knurled edge, graduated on circumference in single degrees, with every tenth line numbered, and read by a conveniently placed pointer; measures 88 mm outside and 78 mm inside graduations, with a distance of 58 mm from center to base of arm; has vulcanite top and is provided with spring clips and centering screws. Analyzer—Consists of a Thompson prism mounted in a revolving collar graduated in two-degree divisions with every tenth line numbered; collar revolves smoothly in cylindrical mounting fitting over draw tube and is slotted to engage stud for zero point; can be easily removed for insertion of microscope eyepiece. Polarizer—Consists of a high grade Nicol prism mounted with a revolving ring graduated in two-degree divisions, with every tenth line numbered, and having an indicating pointer; entire mounting securely supported in substage and fixed for zero point by stud which engages corresponding slot. Finish—Entire instrument neatly finished in durable black. Case—Of hard wood with polished finish; fitted with brass lock and key. a Outfit | Objectives _ Dry Cross Hair Eyepieces Quick Changing Nosepieces Price Mi 16mm Smm 10 X ley >< 84.00 M2 16mm 8mm 10 X 15 X With Two Rings 90.65 Pies Se 76 M 4 32mm 16mm 8mm 4 44 ¥ “15 mS \ With Three Rings 100.00 Microscope, Dissecting, Barnes, consisting of a block of wood neatly finished and made in a shape forming hand rests; with hinged base providing a case for accessories. Stage is of glass 80 x 70 mm, removable, and with black and white plate supplied for use as opaque background; distance from center of post to center of lens 50mm. While Doublet lenses are supplied with the regular outfits listed below any of the regular magnifiers such as Coddington, Triple Aplanat and Hastings will fit the lens holder. NumpberiofaDoubletsinee: ics iapseysyeres cinke «2 ctcieisis s arcie Winloiotetarels oie Seams Toei teleietorarclas eke 1 2 Each 2: pacintinaece HOS Beets HesE One eESe tee taae 2.50 3.2 Lens Holder, Type TU, consisting of a one piece lens arm with spring clamp taking any magnifier not more than 38 mm in diameter, all mounted on heavy metal base; distance from center of post toucenteroflens) 205mm adjustable in: all! directions25 5-4-4) nss see ia ae ene oie 3.00 Lens Holder, Type TUS, consisting of jointed lens arm on triangular post, with rack and pinion, dis- tance from center of pillar to center of lens 340 mm. Spring clamp will take any lens not over 38 mm in diameter, range of rack work 48 mm. See illustration on following page..... nao SHU) 313 Ne ols lie ahs AG TR H. iP iskh Os Wl Gy" SS CG JOT MEE ASN re No. 31856 TUS No. 31860 Type Ul No. 31888 Type W1 MICROSCOPES, BAUSCH AND LOMB DISSECTING, TYPES U, W AND Y. These three types of dissecting Microscopes are supplied in varying outfits as given in the price list below or in special outfits as may be required. The specifications of the stands are as follows witha list of regular equipment and prices — Lens Arm—Jointed so that the entire field of stage may be covered; maximum distance from center of pillar to center of lens, 80 mm. Type U. Focusing Adjustment—By means of sliding post in pillar, with knot; range, 47 mm. Stage—Glass, 80x 66 mm, removable, second set of grooves beneath stage for black and white metal plate, supplied for use as opaque background; spring clips attached to stage support; hand rests may be attached to edges of support. Type W. Focusing Adjustment—By standard rack and pinion, with a knurled head on either side, giving a range of 60 mm. ~ Hand Rests—Of metal, neatly covered with leatheret, 95 mm in length and detachable. Lens Arm— Jointed so that entire field of stage can be covered; maximum distance from center of pillar to center of lens, 90 mm; | arm may be removed for substitution of erecting body; extra removable support provided for attachment of Abbe Camera Lucida, which may be raised or lowered to get full field of view. Type Y. Focusing Adjustment—By standard rack and pinion, with knurled head on either side; range, 60 mm. 5 Stage—Plate glass, 90 x 80 mm, removable; second set of grooves beneath stage for black and white metal plate, supplied for use as opaque background; extra long spring clips attached to stage support; holes for hand rests in edges of stage support. Hand Rests—Mahogany, 160 mm long, attached to edges of support and steadied by metal frames; detachable but included in outfits Lenses Outfit Focal Lengths Formulae Camera Lucida ; Price 31860. Ul 25 mm Doublet 6.75 31864. U2 38 mm 19 mm Doublet 7.50 31868. U3 25 mm Coddington 7.25 31872. U4 38 mm 19 mm Coddington 8.50 31876. U5 25 mm Triple Aplanat 9.50 31880. U6 25 mm 13 mm Triple Aplanat 13.00 31884. HR Metal Hand Rests for Type U per pair— -75 31888. Wi 25 mm Doublet 9.00 31892. W2 38 mm 19 mm Doublet 9.75 31896. W3 25 mm Coddington 9.50 31900. Ww4 38 mm 19 mm Coddington 10.75 31904. Ws5 25 mm Triple Aplanat 11.75 31908. W6 25 mm 13 mm Triple Aplanat 15.25 31912. yeu 25 mm Doublet 17.00 31916. YG 38 mm 19 mm Doublet 17.75 31920. V6} 25 mm Coddington 17.50 31924. Y4 38 mm 19 mm Coddington 19.00 31928. Ys 25 mm Triple Aplanat 19.75 31932. Y6 34 mm 17 mm Triple Aplanat 23.25 31936. er 38 mm 19 mm Hastings Triplet 31.25 31940. Ys 38 mm 19 mm Hastings Triplet Abbe No. 32044 41.25 314 No. 31996 No. 32016 No. 32028 MICROSCOPE ACCESSORIES, BAUSCH AND LOMB. Objectives—The 4 mm (2 in.) objective is supplied in two types of different N. A. The 0.65 N. A. is distinguished by an extraordinarily long working distance, which enables the objective to focus easily through the thickest cover-glass of the Thoma-Zeiss Haemacytometer. The 4mm objective of 0.85 N. A., with less working distance and less depth of focus than the 0.65 N. A. type has the advantage of greater resolving power. Equivalent Focus Band L Numerical Working Micrometer Values Catalog Number Millimeters Inches Aperture Distance with 6.4 X Ocular Price 31944. 1005 48 2 0.08 53 0.087 = 87 yu 4.00 31948. 1009 32 13 0.10 38 0.044 = 44y 4.00 31952. 1021 16 z 0.25 7.0 0.018 = 18p 5.00 31956. 1027 8 z 0.50 1.6 0.0085 = 8.5u 8.00 31960. 1029 4L 3 0.65 0.6 0.0040 = 4.0u 8.00 31964. 1031 4S z 0.85 0.3 0.0040 = 4.04% 8.00 31968. 1035 3 - 0.85 0.2 0.0029 = 2.94 8.00 31972. 1041 1.9 "s 1.30 0.15 0.0018 = 1.82 27.00 ah 5 .10 Oculars—The Huyghenian Oculars are of 23 mm outside diameter and are interchangeable with all modern European oculars such as Zeiss, Leitz, ete. If oculars are ordered for the old American size, i. e., 25 mm outside diameter, this fact must be stated in ordering. Approximate Equivalent Focus Band L Catalog Number Magnifying Power Millimeters Inches Price 31976. 1100 5. Xx 50 2 1.50 31980. 1101 6.4 xX 40 13 1.50 31984. 1102 US 33 1, 1.50 31988. 1104 I@ S< 25 il 1.50 31992. 1106 IPB S< 20 : 1.50 Substage Condensers—The usual Abbe Condensers are neither chromatically nor spherically corrected, but for all ordinary work serve their purpose very well. Their function is to send light through the object under an angle sufficiently large to fill the aperture of the objective with light. They are furnished in two numerical apertures: 1.20 N. A., containing two lenses, and 1.40 N. A. con- | taining three lenses. The Aplanatic Condenser 1.40 N. A., consists of three lenses—an over hemispherical, a meniscus and a double convex, which has a spheroidal surface for correcting the spherical aberration. The spherical correction obtained in this way is of the highest de- gree and perfect for all zones of the condenser, a result that has not been reached by any other construction. The lenses are separable, and the condenser, with the upper lens removed, gives a numerical aperture of 0.60; with both lenses removed, one of 0.40. The quality of correction in each case is of the same high order as that of the complete combination. The Achromatic Condensers are corrected for two colors and spherically corrected for two zones. They are recommended for work where it is essential that a sharp image of the light source, free from color fringes, be projected into the plane of the object. The iris diaphragm is located between the lenses. Equivalent Focus BandL Numerical — Slide Catalog Number Designation Aperture Millimeters Inches Thickness Price 31996. 1740 Abbe Condenser 1.20 12.0 ; 1.80 7.50 32000. 1742 Abbe Condenser 1.40 8.7 z 0.90 9.00 32004. 1743 Aplanatic Condenser 1.40 12.0 4 2.00 22.50 32008. 4535 Achromatic Condenser 1.00 12.0 3 1.90 25.00 32012. 4537 Achromatic Condenser 1.40 13.0 4 0.90 30.00 32016. Dark-Field Condensers—This Condenser is interchangeable with the Abbe Condenser, and can be applied to any Bausch & Lomb Microscopes fitted with either the screw or the complete substage. It consists of a reflector so constructed that the rays are made to strike the object at oblique angles, corresponding to numerical apertures between 1.00 and 1.40, allowing only those rays to reach the eye which are diffracted by the object. The result is that a dark field is produced in which objects appear brilliantly illuminated. Objectives having numerical apertures between 1.00 and 1.40, such as the oil immersion 1.30 N.A., must be provided with a funnel stop, when used with this condenser, in order to reduce the numerical aperture to less than 1.00. For suc- cessful operation a powerful light source is required. See discussion under Micro Lamps. Printed directions are enclosed with each illuminator. In centering mount with iris diaphragm... 11.00 32020. Funnel Stop for oil immersion objective, when used for dark field.................-.+.-. -40 32024. Nosepiece, Double, new dust proof form accurately centered and par-focal for 16 mm and 4mm Glo PeUNahes ses Soaaodedsnsddseas saaecors be coaeceuc Hb oss Suso conor open poe. eospesoDoUodaE 4.00 32028. Nosepiece, Triple, accurately centered and par-focal for 16 mm, 4mm and 1.9 mm objectives....... 5.50 No. 32036 No. 32032 No. 32052 No. 32080 No. 32040 No. 32044 No. 32048 32032. Mechanical Stage, Model A, for attaching to the pillar above the stage of Bausch and Lomb Micro- scopes: BH WBS Heer cena ss eanis sas : 17.00 32036. | Mechanical Stage, New Model, for clamping to the side of the stage of any Microscope provided with a square or rect: mgular vst age. Scale reads 75 mm forward and 55 mm backward, with verniers aS ading to 1/10 mm. Range permits examination of slides 50 x 75 mm from corner to corner. Valuable for examining serial sections, ete.......... seleidwidthee = © aS Se eee 16.00 32040. Abbe Camera Lucida, Model A, simple form....... ec oe OU 32044. Abbe Camera Lucida, Model B, with extension arm for the mirror and moder: iting ‘ela ASSES eee 10.00 32048. Abbe Camera Lucida, Model C, with centering screws, two series of moderating classes aad extension arm for thesmirrote.. 6. h- 2 sos Fe she ano. ac Mase bids poset eres Bes Se ee 17.00 32052. Drawing Board, Stationary, 11 x 9 inches, designed p: artic ularly ‘for use with Model A Abbe Camers 0G | eee een en MEO S Perey bab rooccntees seg ee 1.50 32056. Ocular Micrometer Disc, for use on di: aphrag agm of ocular, ruled to 0.1 mm with « every tenth line nue bered agaee 1 Sis alba ot eaapeennten tere eee ees face S ise: da ade Sree we eR err 1.2 32060. , ruled in 0.5 mm “squ: ures with every seca ite oe 2.00 32064. Ocular WMievometer Dice for use on Sapheaeme of ocular, ruled in 1.0 mm squares, with every ‘line on two.adjacent, sides numbered i.e ccs 5 < os os erdsies eee oe ade Se eee one oe ee ee 1.75 32068. | Ocular Micrometer Disc, Whipple, for counting bacteria, consisting of a large square divided into four squares, one of which is subdivided into twenty-five squares, and one of these again subdivided Into twenty-five SQUALES. 25. Few cies cane ders oes wpe sis sie soe ee 2 One oe ee 3.50 Note—Unless otherwise specified the above Ocular Micrometer Discs are furnished of 23 mm diameter to fit all standard oculars as at present constructed. If for older microscopes with larger diam- eter of ocular dimensions must be given with order. 32072. Micrometer Ey epiece, with movable scale divided in 0.1 mm..................-.2-2eeee-e> Ses 32076. ‘© “fixed scale divided’ in 0:1 mm. ..... (20. 2.05.5 ose ee ee 4.00 32080. Filar Micrometer—A micrometer screw acts on a slide that carries a movable wire. One revolution of this screw moves the wire 0.5 mm across the field. This screw has a drum head divided into 50 parts, one part, therefore, being equal to 0.01 mm. One-tenth of this interval (equal to 0.001 mm = 1) can easily be estimated. A fine line running through the center of the field, parallel to the axis of the screw, serves as a guide in orienting the object with reference to the direction of motion of the movable wire. A glass seale placed in the field and ruled in intervals of 0.5 mm each serves for counting the full revolutions of this screw. Every second interval of the scale is numbered. The eyepiece, which can be focused on the movable wire and scale, is of the Ramsden type and has an equivalent focus,of 20'mm (12:5 X)...... 2.2.5.2 55 e ee eeeee 25.00 32084. Stage Micrometer, on glass slide 75 x 25 mm, ruled to 0.1 and 0.01 MM. ..;..+6..-...) oe 3.00 32088. e Se Ee «© 10:01 and0:001 inch: ... 5... .-.-2 eee 2.00 316 32092. 32096. 32100. 32104. 32108. 32112. 32116. 32120. 32124. 2128. 32132. 32136. 32138. No. 32092 No. 32104 No. 32112-16 No. 32 120 No. 32124 No. 32128 No. 32132 No. 32136 Micro Drawing Apparatus, a new and convenient arrangement for the use of an ordinary Microscope in drawing; suitable for use with powers from 50 to 430 diameters. The standard image distance of 10 inches being fixed, the pencil is operated with the eye at its normal reading distance, an im- portant feature where much work is tobe done. Outfit includes drawing board, mirror, hand Peed are lamp and rheostat for 110 volts, 4 amperes, with plug and cord but without microscope. . 25.00 Drawing Board, only, with support for the microscope, clamp and light shield............ 3.50 Mirror, only, with clamp for draw tube.......... 2.50 Micro Drawing Apparatus, similar to above in operation ‘but with adjustable support for the micro- scope, permitting alterations of the projection distance between mirror and paper. With draw- ing board, mirror, hand feed are lamp and rheostat for 110 volts, 4 amperes, but without micro- ECO DER Gro cite cre aio Fro cae O50: Shc DOO ae SC RoR ence ae eR CR ic Ree Eee eC 27.50 Adjustable Drawing Board, only, with support for the microscope, clamp and light shield... 6.00 Polarizer, for use interchangeably with an Abbe condenser in the substage; with one selenite... .. 12.00 Polarizer, same as No. 32112, but with three interchangeable selenites mounted i in metal rings 15.00 Analyzer, for use with either of the above Polarizers for attaching to the microscope immediately above the objective... 10.00 Analyzer, for attac ching to draw tube above the ocul: ws with graduated dise to measure angle... 15.00 Turn-Table, for ringing mounts and making cells..... Bulls-Eye Condenser, for the illumination of Opaque objec ts and to secure parallel beam from arti- ficial sources of light. On adjustable stand. apie here Menace mi Wot eh iOS soso fei snk ov oath aeedet, maemo: 3 56 75 LOE) (res errant See BA Sects ras STR Ryda eae ee ee 3.00 5.00 7.00 Vertical Illuminator, for illuminating opaque objects, pz articul: arly metal surfaces; for attaching immediately above the objective....... 6.50 Vertical Attachment, new form, with bulls-eye ‘condensing lens and iris diaphragm attachment. 15.00 We have found it difficult to comprehensively and clearly present the two makes of Microscopes and Accessories (Bausch & Lomb and Zeiss) in the space at our disposal in this catalogue. We believe those familiar with Microscope equipments will find no difficulty in securing the information necessary to the selection of outfits from the ma- terial listed on these pages but we emphasize our desire to send upon application the original catalogues of both Carl Zeiss and Bausch & Lomb Optical Co. with such addi- tional and more specific information as we haye gathered in an experience of over twenty years in the sale of Microscopes. No. 32144—Stand IB with Triple Nosepiece, Objectives, and Ocular MICROSCOPE, ZEISS STAND I. This is the standard Microscope throughout the civilized world for the 32140. 32144. 32148. most refined investigations by ocular observation, photo- micrography and micro projection; the large body tube permits the use of projection objectives and micro planars with full use of the emergent beam. These Stands are all of the handle arm type as shown in illustration. The finish and mechanical adjustments of these Microscopes represent the highest development of instrument making as applied to optical instruments. Fine Adjustment—B Stages—The p the large revolving mechani- y be ordered as an extra acces- ent for Stand IC is not inter- milar appearance to the large work because oi its extremely slow ed by two coaxial milled heads and on nical stage with a range of motion of vernier showing the position of the movable stop ninating Apparatus with Abbe condenser system o-micrographic work particularly with objec- ctly superior to the regular Abbe system and icrography is to be accomplished with objec- . is recommended and in a complete photo- oi t he most refined work. S ands are all furnished in fine polished mahogany cases and _prices do not include oculars, nosepieces or objectives. For prices on Complete outfits see page 323. Stand IA, with plain revolving and centering vulcanite stage and Abbe condenser of 1.40 N. A. Duty Rrees. 3.28 eee 81.25 Stock. . ..55.<.2 << 5.0ee eee 100.75 Stand IB, with large revolving mechanical stage and Abbe condenser of 1.40 N. A. Duty Free (5525) ore . 100.00 Stock. .... . .-c(c).5 502022 eee eee 124.00 Stand IC, with special photo-micrographic stage, aplanatic condenser of 1.40 N. A. and set of accessory fittings for photo-micrography, consisting of a light-proof connecting funnel, light-proof connect- ing sleeve, adapters for the attachment of Microplanars, centering diaphragm, moderating glass and revolution counter. Duty Free | Fe se22 5245-56 112.50 Stock... .... o0.2505.0ne bos eee eee .. 139.50 No. 32156—Stand III CA with Triple Nosepiece, Ocular and Objectives MICROSCOPE, ZEISS STAND III. This is the most widely used of the new series of Zeiss Microscopes with 32160. 32164. handle arm and Berger fine adjustment. It is identical with Stand I with the exception of large body tube and the finish of the base which in Stand III is of crystallized lacquer instead of smooth black. For all ocular observations, therefore, this stand meets the requirements of the most refined investiga- tions but is not recommended for a wide range of use in photo-micrography and micro-projection because of the narrow or standard tube. Special attention is called to the four types of stages fur- nished as regular equipment with this outfit. With the exceptions above noted this stand is identical in finish and mechanical adjustments to Stand I. Fine Adjustment—By Berger slow motion with side wheel, first introduced by Zeiss in 1898. Stages—The fixed round stage furnished as regular equipment with Stand IIIC is 11 cm in diameter. The simplified mechanical stage furnished as regular equipment with Stand IIICA is a non-revolving stage fitted with a movable plate giving a back- ward and forward movement by operating two screws jointly and a transverse motion by operating the same screws in opposite directions, with a range of displacement of 10 mm. This has been found a great convenience and for many pur- poses as satisfactory as the large mechanical stage. This simplified mechanical stage is also arranged as a revolving stage furnished as regular equipment for Stand IIICB. The plain revolving and centering vulcanite stage furnished as regular equipment with Stand IIID is the same as supplied with Stand IA and the large revolving mechanical stage supplied as regular equipment to Stand IIIE is the same as supplied with Stand IB. All of these stages are interchangeable and can be supplied as accessory equipment after the purchase of the regular microscope. F INuminating Apparatus—These Stands are all furnished with the complete Abbe [luminating Apparatus with Abbe condenser system of 1.40 N.A. as regular equipment. For very refined work we particularly recommend the addition of aplanatic condensing system of 1.40 N.A. or the achromatic centering condenser of 1.00 N.A. The Stands are all furnished in fine polished mahogany cases and prices do not include oculars, nosepieces or objectives. For price on Complete outfits see page 323. Stand ITIC with fixed round stage and Abbe Condenser of 1.40 N. A. DutyaRreess eee 63.75 TC d Cae ARR Ona Mabe 5 Genie an ee eee 79.05 Stand IIICA with simplified non-revolving mechanical stage and Abbe Condenser of 1.40 N. A. Wty Freee rec, sss cin 66.25 S toch eel oan tens Sele es aes ae 82.15 Stand IIID with plain revolving and centering vulcanite stage and Abbe Condenser of 1.40 N. A. Duty; Bree wconcc scenes ss: 72.50 Stocks ie qa en ee eters te wicisl salen . 89.90 Stand IIIE with large revolving mechanical Stage and Abbe Condenser of 1.40 N. A. Duty Breese ee ne 91.25 Stocker eos ese asuseee soocog BAS 319 A Re. a H U R aly a Jal OTM Ages. GOP SM ee ex Ni _-Y. ~e ame No. 32170 32170. Swingout Condenser Mounting, for Abbe Condenser of 1.40 N. A. If ordered with Stands JA, IB ITIC, ITICA, IID, or ILID, extra Duty Pree ys sist cece 6.25 Duty Paid ...32. :serks|ces 3: \oe ee eee 7.75 Note.—The Aplanatic Condenser of 1.40 N. A. as furnished on Stand IC is not adaptable to the swingout mounting. REVOLVING STAGES, ZEISS. The Plain Revolving Vuleanite Stage as well as the Large Revolving Me- 32180. chanical Stage may be ordered separately at any time for use with both Stands I and III or may be ordered as additional accessories at the prices given below. Plain Revolving Vulcanite Centering Stage, only IDutyghreen nok. Eee 6.25 Stock... cisco. cs0te. 5 ow etey0 010 ee 7.75 Large Mechanical Revolving Stage, with center housing. Dutyphree tcc. eee 25.00 Stocks 50 256s tes sce ots oe Oe 31.00 Center Housing, for use with plain revolving vulcanite stage or large mechanical stage. ID ANAT Os gon accent ee ae Bere 4.25 Duty Paid ):.2 ics... erate SUBSTAGE CONDENSERS, ZEISS. The following Condensers all fit interchangeably into the upper sleeve 32184. 32188. 32192. 32196. 32200. 32204. of the complete Abbe Illuminating Apparatus. In the series of Stands I and III previously listed we have included Condensers in the price but here list them separately with additional systems for special work for ready reference in making up the prices of special outfits. Abbe Condenser, three lens system, 1.40 N. A., equivalent focus 8 mm. DutyeRrees se... ee Os2o) Stock seis cccicaeu ssc ee eee 22 Talo Aplanatic Condenser, 1.40 N. Nees equivalent focus 10 mm, particularly recommended for photomi- crography with high power objectives of wide aperture. Dwtyabree ieee ahs acvs cise 15.00 Stock ..oo:.. cased aco. eee eee 18.60 Note—The front lens of both the preceding Condensers may be removed and the remaining lenses used as a long focus Condenser of small aperture for low power work. When the complete set is used with objectives of large aperture the Condenser should be used in immersion contact with the slide. Centering Achromatic Condenser of 1.0 N. A., equivalent focus 14mm. This condensing system has an iris diaphragm mounted between the lenses and the iris diaphragm of the Abbe illuminating Apparatus should, therefore, remain opened when this condenser is used. This Condenser is recommended for the most refined investigations in both ocular and microphotographic obser- vations with objectives up to 1.0 N. A. and for best results should be used in immersion contact with the slide. Dutyebreess orem kecce 18.75 ol (ol MIB or or OsoGdaccce-: 23.25 Condenser, Quartz, of 1.30 N. A. with interchangeable upper part reducing the aperture to 0.8. For use in work with the Ultra-Violet as in the Luminescence Microscope. Dutyihreete sao oes 17.50 Stocks. osc chek cetiw ts ose oe 21.70 Condenser, Paraboloid, for dark field illumination. DutysHrees oocea eves dates 10.00 Stock. 200.0056 ddan ie te eee 12.40 Paraboloid Stops, ‘for Zeiss Achromatic Objectives DD, EF, F, J and jth inch and Apochromatie Ob- jectives of 4mm focus and less. gs DutyWreeterr pence aoe 25 Stock: ca.sceces ncmun gel eee ee eee eee 31 Note—For best results in dark field illumination with the Zeiss Paraboloid Condenser, Are Lamp No. 32848 page 331 or Nernst Lamp are recommended. The Condenser should be used in immersion contact with the slide, care being taken to avoid air bubbles. With all dry objectives of moderate power dark field illumination is obtained by total reflection at the cover glass. With dry objectives of high power and all oil immersion objectives a stop must be introduced into the objective mount in order to reduce the aperture of the objective to about 0.8. This stop is indispensable with immersion objectives of over 1.0 N. A. since dark ground illumination is produced in them not by total reflection at the surface of the cover glass but exclusively from the illumination of apertures above 1.0 N.A. The very considerable reduction of aperture of immersion objectives which is thus necessary to secure proper dark field illumination reduces their resolving power to such an extent as to make it advisable to use the higher power dry objectives wherever possible. The Paraboloid stops for the objectives are furnished without charge when both condenser and objective are ordered at the same time. OCULARS, ZEISS. Huyghenian or Orthoscopic Oculars should never be used with Apochromatic Objectives 32208. as they are computed only for use in connection with the achrcmatie systems. The Compensating Oculars, on the other hand, may be satisfactorily used with Achromatic Objectives of considerable ap- erture, i.e., 0.85 N. A. and upwards or, in other prong, with Achromatic Objectives DD, E, F and {4 inch Oil Immersion. The two new Orth« scopic Oculars are recommended for use with Achromatic Objectives where high magnification with large field of view is required. Asin the case of Compen- sating Oculars they permit the use of the eye rat a very comfortable distance above the eye lens with the entire field in view. Zeiss Huyghenian and Orthoscopic Oculars. Huyghenian Orthoscopic DesionationsNosee eee eee 1 2 3 4 5 16.) eae Equivalent focus, mm....... , 50 40 30 25 20 15 9 Magnification:: aan ; aay 3 4 5.5 fi 9 12 20 Dutybreexe ee ee 1.50 1.50 1.50 1.50 1.50 6.25 6.25 Stock..... 1.86 1.86 1.86 1.86 | 1.86 7.75 7.75 320 Re a EL S30) = aR H. i Ee OF Mh Ay S CS Oo Wh JP A INT Se ZEISS ACHROMATIC AND APOCHROMATIC OBJECTIVES, HUYGHENIAN, ORTHOSCOPIC AND COM- PENSATING OCULARS. The tables on bottom of preceding page and those on this page give the principal optical data and pri-es. Please always specify focal length in addition to catalogue number in ordering. The information on this page with the tables of magnification on the following page will be found of great assistance in selecting the optical equipment for Zeiss Microscopes. 32212. Compensating Oculars, Zeiss. Seeker Compensating Oculars Designation........ 2 4 6 8 12 18 Equivalent focus, MMe ssi 23 70 39 33 21 15 10 Duty Free.... : 5.00 5.00 5.00 7.50 7.50 6.25 7.75 Stock=esacese sash 6.20 6.20 6.20 9.30 9.30 Achromatic Objectives, Zeiss. In combination with Huyghenian Ocular 2 with 160 mm tube Equivalent 4, “ Class Designation focus, pen! dene tty Duty Free Stock mm Free work- Diameter ing distance of field of mm. view, mm. 32216. Ao 4 _- 32 14 3.00 Bye 32220. Ai 45 = 61 10 3.00 3.72 32224. A» 37 -- 3 fed 3.00 3.72 32228. As 28 — 27 5) 3.00 3.72 32232. A* 43-29 _ 10-42 9-2 10.00 12.40 32236. aa 26 0.17 14 4 6.75 8.37 32240. A 15 0.20 9 2 5.00 6.20 32244. AA 17 0.30 MED 2.5 7.50 9.30 32248. Dry Series B 12 0.35 3 1.5 7.50 9.30 32252. Cc 7 0.40 1.8 09 7.50 9.30 32256. D 4.2 0.65 0.6 0.5 8.75 10.85 32260. {DD 4.3 0.85 0.4 0.5 12.50 15.50 32264. TDD with correction collar 17.50 21.70 32268. jE BS 0.90 0.25 0.35 15.00 18.60 32272. TE with correction collar 20.00 24.80 32276. {F 158 0.90 0.17 0.23 18.75 23.25 32280. TF with correction collar 23.75 29.45 82284. Pl 25 0.11 36 4 5.00 6.20 32288. Water D* 4.4 0.75 1.5 0.55 | 18.75 23.25 32292. Immersion J 1.8 1.18 0.2 0.23 27.50 34.10 32296. J with correction collar 32.50 40.30 32300. Homogeneous 1-12 Inch 1-8 1325) 0.15 0.25 25.00 31.00 32304. Immersion 1-12 Inch Flj 128 1.30 0.13 0.22 35.00 43.40 7 Fluorite system. Apochromatic Objectives, Zeiss. With Compensating Ocular 4 at 160 mm. Equival . Initial tube | h Class eeass Numerical) Maznities: na paaberee _ | Duty Free Stock Ws Gere tion Free work- Diameter | ing distance of field of | mm. view, mm. 32308. 16 0.30 15.5 5 2 20.00 24.80 32312. Dry Series 8 0.65 a a A f | roe | S100 32316. 4 0.95 6 ).2 -45 | 35. 3.40 32320. 3 0.95 83 0.15 0.35 40.00 49.60 32324. Water Immersion 2.5 1.25 100 0.18 0.25 | 62.50 | 77.50 32328. 3 1.30 83 0.20 0.35 75.00 93.00 32332. Homogeneous 3 1.40 83 0.16 0.35 100.00 124.00 32336. Immersion 2 1.30 ee 0 io a a ou sation 32340. 2 1.40 25 0.12 25 100.00 24. 32344. 125 1.30 167 0.69 0.20 87.50 108.50 321 Lb i& Hw R H. EE. Bw O| Mi) ALS CO) UME ee Ay ING aay, MAGNIFICATION TABLES FOR BAUSCH & LOMB AND ZEISS OBJECTIVES AND OCULARS Table of Magnifications with Bausch & Lomb Achromatic Objectives and Huygh2nian Oculars computed upon the basis of tube length = 160 mm and projection distance = 250 mm. Objectives Eyepieces Initial magni- 5x 64x 7.5x 10x 12.5x fication of = = = = = Objective Magni-| Sizeof Magni- Sizeof Magni- Sizeof Magni- Sizeof Magni- Size of fication’ field ficaticn field fication field fication field fication field Equivalent focal! length in mm. 48 2 10X 10.5 mm 13X 93.0 mm 15X 8.5 mm 20X 8.5 mm %>X 6.8 mm 32 4 20X (5.5 mm 26X 4.8 mm, 30X 4.3 mm 40X 44 mm 50X 3.5 mm 16 10 50 | 2.10mm 6X 1.85 mm); 75X 1.70mm_ 100X 1.74mm 123X 1.38mm 8 20 100 X | 1.02mm 130 X |0.90mm/ 150X 0.83 mm _ 200X |0.85mm 260 X 0.67 mm 4 43 215 X | 0.48mm 275 X (0.43 mm) 320X 0.39mm 430 X 0.40mm) 560X |(0.32mm 3 57 285 X | 0.36 mm | 365 X (0.32 mm | 420 X _0.29mm_ 570 X 0.30mm/)| 740 X | 0.24mm 1.9 95 475 X | 0.22mm_ 610 X |0.19mm 720 X | 0.17 mm) 950 X | 0.18 mm 1260 X 0.14mm i i | } | | Table of Magnifications with Zeiss Apochromatic Objectives and Compensating Oculars at 160 mm tube length and calculated for an image distance of 250 mm. Focus of the Ohiectivetinm Seeker Compensating Oculars 2 4 6 Sy 12 18 16 31 62 gt 125 187 281 8 62 125 187 250 375 562 4 125 250 375 500 750 1125 3 167 333 50 667 1000 1500 25 200 400 600 800 1200 1800 2 250 500 750 1000 1500 2250 15 333 667 1000 1334 2000 3000 Table of Magnifications with Zeiss Achromatic Objectives and Huyghenian and Orthoscopic Oculars at 160 mm tube length and calculated for an image distance of 250 mm. Huyghenian Oculars Orthoscopic Oculars Objectives = a — — = = =~ es 1 2 3 4 5 6 7 Ao 4.8 7 1l 18 23 38 Ai 7 10 16 28 35 a7 As il 15 23 37 47 75 Aa 20 26 38 55 68 110 AS 3-8 5-12 8-18 15-31 20-40 32-63 aa 24 31 46 75 95 150 A 2 a4 79 130 165 260 AA 39 50 73 120 150 240 B 58 74 110 180 225 360 Cc 100 125 180 300 370 590 D 175 220 330 350 680 1100 DD 170 210 315 530 650 1050 E 275 345 505 $30 1030 1650 F 410 510 733 1260 1540 2500 Pl 26 33 48 80 100 160 De 170 210 315 530 650 1050 J 410 515 750 1280 1570 2540 1-12 410 515 750 1280 157 2540 55 As As Aa Pl at 40 Free Working distance mm 70 Mi peut me 40 30 35 phragm phragm -- Diameter Diameter --_ Diameter :¢_ Diameter -- Diameter = Magnifi- = Magnifi- ° Magnifi- = Magnifi- = = Paired Oculars a of field : of field 5 of field - of field 7 of field cation nih cation a cation iam cation aia cation Sail 8 3 lt 7.5 20 5 31 3.3 37 3 9 13 15 7.5 23 5 35 3.3 2 3 13 10.5 22 6.5 32 4.2 50 Ry 60 2.5 16 8.5 27 4.8 40 3.3 61 2.2 7 2 23 6.2 39 3.6 57 2.5 88 1.6 105 1.4 26 7.1 46 4.1 7 2.7 103 1.8 121 1.6 44 4.1 77 2.4 112 1.6 172 1.1 200 1 322 Pen ao DUT ak H. Ts Ue Os gM wAS ES CoyiO)” IM Wea vAS NG aye COMPLETE ZEISS MICROSCOPE OUTFITS _ With the preceding information as to Zeiss stands, stages and condensers and the optical data and prices of oculars and objectives, complete Zeiss outfits can be made up to meet all requirements. For the conveni- ence of customers we list below commendable outfits on the basis of Stands I and III with both achromatic and apochromatic equipment. 32348. Apochromatic Outfit on the basis of Stand IA, 32360. Apochromatic Outfit on the basis of Stand IB, i. e., with plain revolving vulcanite i. e., with large revolving mechanical stage. stage Stand IA, with Abbe condenser Duty Free Stock StandIB, with Abbe condenser Duty Free Stock of 1.40 N. A. and plain re- of 1.40 N.A-. and large revolv- _ volving vulcanite stage. . 81.25 100.75 ing mechanical stage........ 100.00 124.00 Triple Revolving Nosepiece.... . 5.00 6.20 Triple Revolving Nosepiece. - 5.00 6.20 Compensating Ocular 6. : 5.00 6.20 Compensating Ocular 6 mcr 5.00 6.20 $ ss Eee 7.50 9.30 xe Ci) Fae 7.50 9.30 Apochromatic Objective, 16 mm 20.00 24.80 Apochromatic Objective 16mm 20.00 24.80 ee “s 4mm 35.00 43.40 s us 4mm 35.00 43.40 “ s 2mm ne se 2mm 1.30/N@ ANS. = <5 = 6 12.50 “ bie A> 13. Paired Objectives 55... 11.25 95. Ao.. 11.25 Asiecsia 2c 11.25 A redbooceone 11. 112.25 32496. | Stereoscopic Camera, Driiner, for use with Binocular Microscope, with instan- taneous shutter, focusing frame with ground glass and clear glass screens and plate holder for a pair of plates 6x 6cm. For use on Stand XB without additional accessory or on Stand XNA by the use of Straight Duty Free Support RTOS Y-7 9 (sprains 1G 8 ANOS, 2 Bere ie aT Ee t SO Ee Mee a NF 35.00 Extra Plate Holder for pair of 6 x 6 cm plat ites 4.50 32500. Reflecting Stereoscope for obtaining orthomorphie views of the ne gatives made with above camera, with a magnification of two diameters. See v. Rohr, “Die binokularen Inst umente,”” Berlin, 1907, published by Julius Springer and H. Braus, Zeitschr. f. wiss. Mikr., XX V, 1908, pp. 282-287 12.00 32504. Paired Objectives, for Zeiss Binocular Microscope. For magnification, etce., see page 322. Designation 55 Ao A A3 Duty Free... 11.25 11. 11.25 11.25 Stock---.-2- 13. 5 13.95 13.95 13.95 32508. Paired Oculars for Zeiss Binocular Microsc ope. For magnification, ete., see page 322. Designation. .. : 1 2 3 4 5 6 Duty hree een eee ee 3.00 3.00 3.00 3.00 3.00 12.50 Stocks eee ee eee 3.72 3.72 3.72 3.72 3.72 15.50 MICROSCOPE, DISSECTING, MEYER-ZEISS, a large dissecting microscope of almost universal application with the great variety of accessories offered; particularly recommended for use with the Binocular body, but may be fitted with simpler magnifiers such as the Anastigmatic No. 31024, the Briicke dissecting combination or with either the monocular or binocular compound microscopes, as on Zeiss stands XA, 32512. 32516. 32620. 32924. 32528 . 32532. 32536 32540 32544 32548 32552. 32556. 32560. 32564. 32568. No. 32512 with 32536 XB, XC or XI. Dissecting Stand with adjustable mirror and light modifying device, stage measuring 8 x 6 inches, round stage opening 4% inches in diameter, brass disc and plate glass dise to fit the stage opening, two arm rests, and holder fitted with rack and pinion for magnifiers and compos- HOGER rir GUE Ths 5 oop acic 6 bacins aD ang RO ONO See DeOUOoG Aemnadd ode codsecnndassacepesodaSsacd Ditto, with simple sliding lens holder..... i Cabinet for the stand, of alderwood..... Round Foot rendering the lens holders available for use as lens stands independently of the dis- RECLITIPIMICLOECOPON ee en Pepe etenitn Cre iicers sites ences hate ee ele cele eet iaiian iclonemtacreney Note—The stand of the new dissecting microscope may ‘be use in conjunction with the body of the binocular microscope X b, the Driiner camera, the body of the erecting microscope X 1, as well as a single tube similar to that of Stand IX. For this purpose we supply a yoke attachment of two patterns: Yoke with Slide Carriage for giving a traversing motion of the microscope body, with two fixing GLOWS Sete iat arerctale arate aa ete eral ictatn lalate tales nie clas sleicieiaiatersiarcietemnfeieLeverereietetceraictetet ie’ sretpisterarcls Yoke without Traversing Slide Carriage, with two fixing screws. a Note—The various Bodies which may be attached to the yoke are subject to the followi ing prices: — Body of the Binocular Microscope Xb ¥ 5 : Ais DriineriStereoscopel Camera sea ea) e ie coer eels bale laie mu seis ticiaige iain nial Maeda rams oie eben ele aisle Pillar Bracket for the attachment to the yoke of the camera or the body of Stand Xb Pillar Bracket for the attachment of the body of Stand Xb in an inclined position Body of the Single-tube Erecting Microscope X1 with exceptionally large radial extension. . F Body similar to that of the Single-tube Stand X1........... 20sec coc eseee eee cnet senses eeenesecs Note—The following parts are required to render the stz ind available for use a3 a ball stage micro- scope: Ball Stage to drop into the stage opening . Raising Block for attachment between the yoke and the pillar bracket, with. two long fixing screws Drawing Apparatus for use with the Mayer Dissecting Microscope. 7 CODOBDAD SHOU IOeRaaOT Duty Free 24.50 17.50 3.00 1.75 Re aN on wr neers _ anscus sassses Duty Paid 30.38 21.70 3.72 2.17 > No. 32674—Luminescence Microscope MICROSCOPE, LUMINESCENCE, ZEISS. This apparatus consists of an ordinary Microscope Stand as used for 32572. 32576. 32580. 32584. 32588. 32592. 32596. 32600. 32604. 32608. 32612. 32616. 32620. 32624. 32628. 32632. 32636. 32640. 32644. 32648. 32652. 32656. 32660. 32664. 32668. 32672. 32674. 32675. other work, with Achromatic or Apochromatic Objectives and either Huyghenian or Compensating Ocu- lars, and differs only in the illuminating apparatus and source of light. In order that the illuminating apparatus permit the radiation of the object with ultra-violet light, which causes the luminescence, it is essential that the object slide as well as the condenser system be of quartz, which is permeable for the ultra-violet ray, exactly as is required in the micro-photographic outfit for ultra-violet light. The source of light may be either an are lamp with specially prepared carbons or a Quartz Mercury Vapor Lamp, both of which are rich in ultra-violet rays. A collector condensing system of quartz lenses is also necessary. Light, particularly of wavelength visible to the eye, must be cut out by means of ultra-violet filters in order that the object may be examined solely in the fluorescent light originating from it under the action of the ultra-violet ray. The Lehmann filter with the additional filters of blue Uviol glass provides this feature. The illustration shows the outfit complete with Zeiss Micro- scope Stand III in position and the hand regulating arc lamp, but with the diaphragm removed to better display the remaining parts. For more detailed description send for a copy of Zeiss Micro 325. The component parts of the equipment with individual prices are as follows: Duty Free Duty Paid Base Board, .withioptical bench ,0/cmilongwnera eta cerioecice eieeeioneee 8.75 10.85 DiaphragmiArrangement: ...).c:.c0.0 enon eo eon e See eos eC era oe 5.00 6.20 Blue Uviol Glass Disc, 6 cm diameter, on support....................0000005 7.00 8.68 WV Bilters6:cm)diameter:on supporto. ene eee ee Oe eee 17.00 21.08 Wash Bottle, for filling and emptying the UV Filter......................... 69 85 Quartz Condensing Lens, plano-convex, 6 cm in diameter, on support........ 13.25 16.43 Supportitor microscope with quartz prismseer eee eee eee eee er neers 12.50 15.50 Quartz Substage Condenser with iris diaphragm............................. 17.50 21.70 Gentering Device formabovelt: acc 20.26 cas ee eteloamenis Se teee Oee ee ies 3.00 3.72 Uranium Glass Plate, with circular ring for centering........................ 2.00 2.48 Plane mirror in mounting, for the convenient observation of the uranium glass Centering spate ree gs ccc .c dels < deren CeCe De eee eee Eee 38 AT Micro Slide of Quartz, 0:5 mm thick, 25x 80'mm................c..0-0..005- 1.13 1.40 Cover Glass, of Euphos glass, 0.17 to 0.20 mm thick, 12 mm in diameter...... 25 31 Object Carrier, Heidenhain, for the convenient manipulation of the quartz SING sanctioned aac Seo cane eee eee de cas too ba onodccguc joo 50 -62 Hand Regulatins eo) < ieee BOs aR Isle A bit SOD SMe eAg eS CeOF Ma es AL IN \ o \\ \ \\ ULTRA-MICROSCOPE, ZEISS CARDIOID CONDENSER TYPE. The Cardioid Microscope as devised by 32676. 32680. 32684. 32688. Siedentopf is designed for bringing into view ultra-microscopic particles by means of a simplified attach- ment (the cardioid condenser) providing a remarkable light concentrating power. By this arrangement the rays of high aperture are employed to illuminate the object, while those of low aperture reach the eye. The difficulty occasioned by the presence of surface impurities, the maintenance of a stratum of the correct thickness and the absorbing properties of the ultra-microscopic particles have been avoided by the use of a suitably designed chamber. The Cardioid Ultra-Microscope is primarily adapted for the examination of colloid solutions, diluted precipitates and for the observation of micro-chemical and photo-chemical reactions. Where a suitable microscope and source of light are already available it is only necessary to provide the Special Equipment. In the illustration the Cardioid Condenser is shown in position on Zeiss Stand III equipped with the special apochromatic 3 mm ob- jective with centering appliance, Cardioid Condenser in position on substage and quartz chamber in position in its holder on the stage, with the water cooling cell and are lamp in position. For more detailed description send for Zeiss Mikro 306. ; ’ Special Cardioid Condenser Equipment, consisting of trough for water cooling without wooden sup- port; Cardioid Condenser; quartz chamber; chamber holder; special apochromatic objectives 3mm, N.A. 0.9: centering applicance for special apochromatic objective; compensating ocular 18 with sliding lens system; Huyghenian ocular 1 as searcher ocular, and platina collar with two accessory supports, in case, but without Microscope stand or are lamp as shown in illus- tration. Duty Mree..-..4...4-...- 66.50 Duty Paid AAs Keefe ei eie ste: 82.46 Complete Cardioid Ultra-Microscope Outfit, consisting of above Special Equipment and Zeiss Stand IIIAA, Are Lamp No. 32848 as shown in illustration, with rheostat for 110 volts and 50 carbons. DutyiRreev ern con teres heen 134.76 Duty Raiders oes ae ee 168.51 Complete Cardioid Ultra-Microscope Outfit, as above, with rheostat for 220 volts. DD utyphree siesta eile oieerss 136.2 Duty iPaides so ccete ses so sieanece 170.37 Cardioid Condenser, only. DutyPreers cet ons de ee 10.00 Duty Paid es. cc Severe ee cerca see-40) No. 32700—Slit Ultra-Microscope ULTRA-MICROSCOPE, ZEISS SLIT TYPE, an improved arrangement of the Siedentopf and Zsigmondy appa- 32700. 32704. 32708. ratus originally announced in 1904 and which by the orthogonal arrangement of the direction of illumi- nation and observation and the micrometrically alterable thickness of the illuminating beam in relation to the depth of definition of the objective, entirely removes the powerful absorptive effect of the upper surface of the slide and the lower surface of the cover glass. This arrangement is specially recom- mended for the investigation of all colloidal substances, serum solutions, drinking water, etc. With some additions as listed in separate outfit this arrangement is the only practical one for the investi- gation of ultra-microns inside solid bodies, glasses and crystals. For more detailed description send for Zeiss Mikro 239. Suitable outfits for both liquid colloids and solid colloids are offered as follows :— Complete Slit Type Ultra-Microscope Outfit for Liquid Colloids, consisting of table top with optical bench; objective f= 120 mm in disc-stop on saddle stand; precision slit on saddle stand capable of being rotated by 90°; objective f = 55 mm in disc-stop on saddle stand; sole-plate with cross slide for the optical bench with intermediate-plate; achromatic objective AA for the cross slide; immersion objective D* with trough holder and screw-ring in case, trough with fixed sleeve with conical adapter and hose-clamp; Stand V without mirror, stage or case; Huyghenian ocular 4, cross ruled, with sliding eyelens; Weule’s automatically regulating are lamp for direct current, 5 amperes, with diaphragm for the casing and rheostat for 110 volts. Dutybreeren tn ee eee 172.65 IDUtyePaidteees eee. 214.09 Complete Slit Type Ultra-Microscope Outfit, as above, with rheostat for 220 volts. Dytyzbreer acc acetates 177.38 Dity eb aids cers ome sae sevens 219.95 Additional Equipment to above for Solid Colloids, consisting of achromatic objective C, polarizer on saddle stand, Analyzer I and Zeiss Microscope Stand IV with stage to raise and lower, without Abbe illuminating apparatus, and with case. DD by Br@ Oss ccrercisnve crores wees 120.75 Dutyeeaide essere nononoocscnocs Leb) > He Ur TR H. Te Shivy (OO Mi Ages © 10> 3M Ps AL UN < 32740. 32732. Microscope, Zeiss, for the Observa- tion of Liquid Crystals, consist- ing of Stand IV, with large mechanical stage divided in de- grees with index, but without condenser system, diaphragm holder and iris diaphragm; with gas heating condenser with air cooling apparatus; preparation stage for the large mechanical stage; rotatory and adjustable analyser with selenite film for red of the first order; objectives A and D, each with water cool- ing arrangement; cross line ocu- lars 2 and 4; micrometer ocular H3 and compressed air cylinder. Duty Free... . scene Duty: Paid=->- see eee 274.35 32736. Microscope, Zeiss, same as above, but with analyzer, to be put on the ocular instead of the rotatory and adjustable analyser. Duty: Frees: 24.58 eee 207.50 Duty Paid... 257.30 No. 32732 No. 32740 Microscope, Binocular, Chun, with image erecting prisms, as used for dissecting and observing small animals in trays or on plates of large dimensions. The legs of the stand are jointed and may be extended or brought together to suit the size of the vessel. With paired oculars Nos. 2 and 4 and paired objectives of 77 mm and 40 mm focus, giving a range of magnifications from about 10 diameters to 50 diameters. : Duty Wreesiss5.0 rece eee 80.50 Duty, Paid) «0 ccueciseeesie cee 115.95 No. 32848 (———] No. 32868 No. 32872 No. 32884 MICROSCOPE LAMPS. For all purposes involving the use of a Microscope, 1. e., general microscopy, dark- 32896. field illumination, micro-photography, projection for drawing, illumination of opaque objects such as metallic surfaces (metallography), etc., the small arc lamp- gives the best results, although in the ordinary use of the Microscope the light from the are must be tempered by the use of ground or blue glass dises as provided. The Nernst lamps are a very convenient and satisfactory source of light for all of the work above mentioned with the exception of dark-field illumination w ith high powers, such as jth inch immersion objective for w hic h use the are is much superior. The Welsbach gas lamps give very good results, particularly in micro-photogr aphy, and are very satisfactory for general work with the Microscope. The kerosene lamp, while quite suited for ordinary use with the Microscope is not recommended for dark-field illumination, particularly with the higher powers. All of the arc lamps listed below may be used on ordinary house lighting circuits of either 110 or 220 volts, alter- nating current or direct current, the direct current being the most satisfactory. A suitable resistance is always necessary in using these lamps. The Flask ¢ ‘ondenser is recommended for use with both the Nernst and Welsbach lamps, particularly for dark-field illumination. Micro Lamp, Hand Feed Arc, Bausch & Lomb, on adjustable support, with cord and plug but without GO COB GED Pearce See eye eR elec Seetva ede rece cass’ svageley® ane six: cco, Suokere poaucin meses neoelnie le aieuere eee ee LALOO Micro Lamp, Hand Feed Arc, Zeiss, specially recommended for dark-field illumination with the Zeiss Paraboloid Condenser and with the Cardioid Condenser for the examination of colloidal solu- tions, etc. To prevent undue heating of the object the use of a cell with weak copper sulphate solution or cool distilled water is recommended. Without glass cell. IDwtys Brees 8 ess: taverns cree oe 11.75 Stock. . : . 15.98 Rheostat, fixed form, for 110 volts, 4 amperes; necessary in using either of the above Hand Feed Are [bam pron NOuse CILGULGst acme s)-ebyssicths “ora e precrnay ag en eee OBE : Sat ssoo Hl) Rheostat, as above, for 220 volts, 4 amperes eis = : Sear . 6.50 Carbons, for either of above Lamps, 6 ine hes long, 16 in. diameter. Per 10.. VN eae oe AQ s ne or + in. se erst Olere 38 Micro Lamp, Nernst Electric, Bausch & Lomb, on adjustable support with frosted globe; with cord and plug. Voltage must be specified in ordering. No rheostat necessary.................... 9.00 Extra Glowers. Voltage must be specified im ordering...............-.........-.-.--2---- 35 Micro Lamp, Nernst Electric, Zeiss, in metal mounting, conveniently inclined for easy direction of the beam upon the microscope mirror. The Nernst glower must be warmed when the current is first turned on with an alcohol lamp or similar source of heat. Voltage must be specified in ordering. No rheostat necessary. DUtyabreeas. 47. Se ee aoe 10.00 Stocks iyo 5h ce at ee eee 13.60 j OF tA) (i), Clee ee ORO Re ace ene En Seana seen ococeconace coodac some e eee aeee 1.50 Glass Cell for use with above lamps, with plane glass sides, 100x 80x8mm.................... 3.00 Micro Lamp, Welsbach Gas, with adjustable support, on base, and with a blackened metal chimney EsYol Cyaynys (aYsihiyen (Uc posers 5 cho cece ete GACORE aaanice ca cadet van Sccunbaa dcond dae oeeOnere 8.00 Micro Lamp, Welsbach Gas, similar to above but with the addition of an iris diaphragm for controlling thesize onbheremerrent,pencilvor Light.j- arsctecte sei creat raeeete ei ciseste ie eyes =) ale serarciel 12.00 Micro Lamp, Welsbach Gas, similar to above but without either condensing lens or iris diaphragm ; intended for use with Flask Condenser No. 32900 in which case neither the diaphragm nor the condensing lens is necessary. Se a oars ; Ta ena eee 6.50 Mantles for above Welsbach L amps, each : ae 25 331 32900. 32904. 32908. 32912. 32912. 32916. 32920. 32924. 32928. 32932. No. 32900 No. 32908 No. 32912 No. 32928 No. 32932 Flask Condenser, on wooden stand for filling with distilled water; for use with either the Bausch & Lomb Nernst Lamp or Welsbach Lamp No. 32896, particularly in dark-field illumination... 2.25 DES Ai) 0b Ae earn Anns Con kn Men aan mm cemtogdacpoonkaosscc noc fe 75 Micro Lamp, Incandescent Gas, Zeiss, with inverted mantle and flask condenser. Duty Pree:.---...: . 5.00 Stock 2... .:,. vs cele ore Ree DEE 6.80 Micro Lamp, Zeiss, for Monochromatic Light, consisting of a mercury vapor are lamp 20 em long, spe- cially made for this work, support, screen, and Jena glass flask to act as both condenser and ray filter; particularly valuable in refined microscopic work where it is of advantage to use a beam of light of a given wavelength. By using different solutions in the composition of the ray filter monochromatic light of wavelengths as indicated below are available. Filter for yellow light, \ = 579 and 576 wu. Filter for green light, \ = 546 uw yp. Potassium bichromate................. 15 grams Picric acid... /s52 scimccceescticemee eter Copper sulphate... Didymium nitrate. 1.5 Distilled iwaterst-). sn sscecesmeeneneee 300 ce Copper sulphate Sulphuric acid.. Distilled water.. Note—The above formula without the Didy1 mium nitrate gives a yellowish green light of wavelength \ = 579, A= 578 and X= 546 un Filter for blue light \ = 436 uu. Copper sulphate... Distilled water......... Ammonia . Note—This filter is transparent also to the violet rays ‘of wavelength 407 ed 405 uw. Reference—A Kéhler Uber die Verwendung des Quicksilberlichts fiir mikroskopische Arbeiten; Zeitschr. fiir wiss. Mikroskopie, XX VII, 1910. Complete Outfit, as above, with support for the lamp and condenser flask and condenser flask of Jena glass. without resistance. Duty Free SIR sco Fb inci 16.25 Stock. oJ 8... lee eee 25.00 Duty Free Duty Paid Mercury, Vapor Lamp; only, foriabovessee. ese. «s+ os esc eeeeeeies 5.50 Special Resistance necessary for above lamp, for 110 volts.. Saye 8.75 10.85 “e & “220 volts... : 11.25 13.95 Micro Lamp, Electric, with 60 watt incandescent bulb, blue and amber colored screens and one diffus- ing glass also platform for convenient use in warming slides......................20-0000 10.00 Micro Lamp, Kerosene, on metal foot, with blue moderating glass, shield, ete.................- 7.50 332 Tegra UR H. Ta ig On Me CAS Ss GeLOe Ma EAS ENE oY; No. 32960 32936. 32940. 32944. 32948. 32952. 2956. 32960. No. 32948 No. 32944 No. 32952 No. 32956 Micro Object Marking Apparatus. This device is mounted in a society screw and can be inserted in place of the objective or carried on the nosepiece for use when occasion demands. After the field to be marked is found the diamond point is set to engrave a circle around same, the smallest circle possible being } mm. After the circle is made, the field can always be easily lo- cated by the use of alow power objective at first. This apparatus is intended for use only on preparations mounted under a cover glass. ID atysPre en ete cpr ceil yeas cles 10.50 Stock vac cece. acnnec ne cee 14.00 Micro Object Marking Apparatus, in objective mounting for screwing into nosepiece. This arrange- ment marks by means of a colored ring on the cover glass. The apparatus is filled with color- ing matter and when brought gently in contact with the slide leaves a small ring........... 4.50 Microscope Oven, Plehn-Nuttal, for constant temperatures, improved construction, with metal parts of Nickelin, a non-corrodible alloy. With micro burner and metallic thermoregulator, but with- out thermometer or microscope Duty shrees cae haere eek hess 61.05 DutyePaid see create cc acebie: 81.40 Micro Warm Stage, Pfeiffer, with three concavities for hanging drop, tubulations for inflow and out- flow of water and thermometer graduated from 33° to 44° C. im $ths ...................... 7.50 Micro Warm Stage, Schultze, consisting of a “‘U’’ shaped metal stage to which heat is applied by means of an alcohol lamp or small burner. The stage is fitted with a condenser which renders it avail- able for observations under a high power, and has a thermometer reading to 100° C....... 12.00 Micro Warm Stage, Stricker, consisting of a flat metal chamber through which a constant stream of warm water may be passed; with a lens at the center making it available for use with high powers. A thermometer is provided with bulb within the chamber and scale on the outside of stage. 14.00 Ocular, Double Demonstrating, for use with two observers, with pointer in the common field of view, with power of 6 x. Duty Rrees 7, seacco eee eaters 17.60 Duty Paid 22.00 333 NON- | NON-CORROSIVE NON-CORROSIVE | NON-CORROSIVE CORRCSIVE | AMT.co Naar | AWT.CO. j novi ANT.CO. No. 32968 No. 32968 No. 32972 No. 32992—Size 3 x 1 No. 33008 NON-CORROSIVE 2 No. 33012 NON-CORROSIVE No. 33016 No, 32992—Size 3 x 1} No. 32992—Size 3 x 2 Thickness of Cover Glasses. Number of Cover Glass in } Oz. Boxes. No. 1_varying from 0.13 to 0.17 mm (1/200 to 1/150 inch) } oz. box of No. 1, 18 mm square contains 136 covers. No. 2— “0.17 to 0.25 mm (1/150 to 1/100 inch) 4 oz. box of No. 2, 22 mm circles contains 90 covers. No.3— “ “0.25 to 0.50 mm (1/100 to 1/50 inch) 4 oz. box of No. 1, 22 x 40 rectangles contains 156 covers. 32964. Micro Cover Glasses: Standard White, Blue Label, uniform in color and smoothly cut. Carefully packed in 3 oz. round cardboard boxes. Please specify size, shape and thickness in ordering. 12 SizemmysquaresOr cirClesiy.c. ea. s-2/4 0 este oes é eo) 18 “220 Sae2o Per} 02. DOXANG ol irie sects emer: ycint fee stort Preemie ee 38 -38 38 -38 -38 ef MN O 282 esys orn c crease ear ee nee 30 30 -30 30 30 ss Sic ONO sd 20) 20 -25 20 20 32968. Micro Cover Glasses, “Non- Corrosive,”’ Red Label, guaranteed against corrosion in any climate. Glass is of slightly greenish tint. Neatly packed in } oz. round wooden boxes. A specialty of our own introduction in very wide use. Please specify size, an ave and thickness in ordering. 18 Sizes squares OLscInCles=s nese eats eee ar 5 i 22 oe) Per + 0z. box No. H Sno BAe aio Otte Ae aaa Be 45 45 A 45 ae SOMEIN Os: oe Pye GiecS actin PRE eC ane 35 3D 35 35 35 32972. Micro Cover Glasses, tINonL Corrosive,” Red Label, rectangular shape. Most used sizes. Size, mm 22x30 22x82 22x'36 22x40) 22:50) 24 30R2ao6 ADDIOK: contents ot 30z.boxof No.1 60 58 50 48 38 66 45 No.2. 53 oO 4 380 26 51 36 Per } oz. box of No. 1..... 75 75 75 75 -75 -75 75 SS SSSNOS 2 cans 50 50 50 -50 50 -50 -50 SIZE Aer ere. cos ndn erates Ae epee 24x40 24x50 35x 50) 35:x'62) ~ 43x50 4Sen10 OD rOx contents off oz. box of No. 1..... 44 37 26 22 16 14 CO CNIS eats es ee 26) 20) 16 Be 12 Per FOZ DOXIOLINOs lenny sere eee iD 75 75 -75 75 -75 cs CON Oe, 2en serene eee 50 50 50 50 -50 50 32976. Micro Slides, Standard White, Blue Label, with carefully ground edges, average thickness 11 to 1} mm; carefully packed with paper between each slide, in } gross ¢ ardboard boxes. Si Zenmin Chests Seen koe ace ue ec Oy re ne ee eRe 2x1 3x1 3x 3x2 IB Gre VOLOSSRDOXK ey. eiorssc ccs Mert GAO ee Ee A5 45 a5 1.10 32980. Micro Slides, s same as above, 3 x 1 inches, but 2 to 14 mm thick. Per 3 gross box................ -40 32984. Se OK Lae tee “and polished on both sides, of spe- 1.10 ciallyyselectedistock. Per? gross box... 220.5 secesceecnse solace ee cee eee ee eee 32988. Micro Slides, same as above, i.e. ¢ to 1} mm thick, 13 xl inch, for petrographers. Per gross box .40 32992. Micro Slides, ‘‘Non- Corrosive,” Red Label, with well ground edges. The limits of thickness are usually from ? to 1; mm but the slides in any one box are usually of the same thickness. A specialty of our own in wide use. This slide is of a slightly greenish tint and is guaranteed not to corrode or become cloudy in any climate. Size, inches............ 3x1 3x3 3x2 Pers TOSS DON es ee aie sc osctese space oo eS SR OEE CERO 45 1.00 1.25 32996. Micro Slides, same as above but carefully selected to be between 11 and 2 mm thick, and as free from striae and scratches as possible as required in the U. S. Bureau of Plant Industry. In3x1 inch size‘only:, Per’ 4: gross) bDOX.:....<.. 0.5. co. tee ee eee oe eee 50 33000. Micro Slides, for Brain Sections, with carefully ‘ground edges and about 2 mm thick. Sizesiminity see eee Reena aioe cee: Senne oes 80x 110 100x150 115x150 160 x 190 153) 7 eis Bis irdncboe arose 10 .d ah Benihana tetera stat 6.00 8.00 9.00 15.00 33002. Micro Covers for Brain Sections, of glass v ary ing from .5 to .7mm thick. Size,mm.... 40x55 40x90 45x70 65x100 65x110 75x125 90x140 90x175 105x140 125x145 Berl 00h ae 1.10 1.80 1.60 3.25 3.60 4.70 6.30 7.85 7.35 9.10 33004. | Micro Covers of Mica, for Brain Sections, carefully selected to be as free as possible from striae, etc. Size, mm...... 40x55 40x90 45x70 65x 100 65x 110 75x 125 90x 140 90x 175 105x140 125x145 Per 100.. .. 1.80 4.80 3.60 12.00 13.20 21.00 27.00 36.00 36.00 54.00 33008. Culture Slide, 3x1 inches, with polished spherical concavity 12mm in diameter; as used for hanging drop: and/similar,reactions., “Wach)as-sccsscers- scence ase ss cee dee ve eee eee ee 05 33012. Culture Slide, same as No. 33008 but with two concavities. Each.........................-00-- -08 33016. a “3.x 1 inches, of heavy polished plate glass with flat bottom, depression 3 mm deep and 16 mm in diameter. Inside of bottom is smooth, but not polished. For drop cultures, ete. Each ae ; : PS kW ecto ree ere areata als ida ve oo ee 20 334 rs No. 33028 No. 33032 No. 33036 No. 33052 No. 33060 No. 33064 No. 33068 33020. Culture Slide, consisting of heavy polished plate glass slide with cell, 15 mm in diameter, 3 mm deep, fused on in electric furnace. The advantage of this slide is that the bottom of the cell consists of the plate glass slide free from inequalities........................22--200--000-- .35 33024. Culture Slides, for cultures, electrolysis, etc., with side tubes and cover glass.................. 1.00 33028. Glass Rings for Micro Slides, with edges finely ground, for cementing on ordinary slides to make cells Diameter smmivees pease oo ce .- Meee ee ee 15 “18 18 22 24 Height, mm. 5 ofc Shes Rees Deena eet eer ae : 3 5 10 9 10 LINN. »4 Ses uth noes oe tO Or Ee See erie -08 -10 -10 aio -20 33032. Glass Cells for Micro Slides, consisting of a square plate of glass, with circular hole. Diameter of hole, mm....... eee 10 10 15 15 18 18 Thickness of glass, mm......... Sai 1 2 1 2 1 2 Mache... s soca eee : a5 15 15 15 “15 ad 33036. Micro Labels, ‘for slides, with border, Z2.MIn SGuace CF: Doxiol, 1005s) ae ee ee .10 Pericartonof 10iboxesses.- enn ee 75 33040. cc fe ee ee s ss rectangular, 22x15 mm. Per box of 100................... 10 Per carton of 10 boxes........... . 75 33044. < ss sf “in books of 500 labels each. These labels are printed on best white gummed paper and are scored as to be readily torn from the book, leaving clean edges, interleaved with paraffine paper. Size 22 mm square. Perhook) soem Sosa coe eS eee ceeate ee 33048. Micro habela, for slides, same as No. 33044, but rectangular. Size 22x15 mm. Per book........ .25 33052. Micro Slide Box, for conveniently keeping clean slides to be withdrawn one by one as needed. For AGiAchine SnD OAR UD On CORRE DECC BSHOS DEES DEITIO aInAen TULMICOD OCIS 17.50 23.10 Centering Appliance for the quartz condenser, or for objec tives which are to be used as con- densers 3.00 3.96 Screen, of Uranium Glass, to insert into the diaphra 4zm carrier of the Abbe illuminatir 1g appa- ratus, with roded circle Pe pons onsecicr aeoeeD 2.00 2.64 Rectangular Plane Mirror, to place on the foot of the microscope stand.... : Siiste 38 Ad 4 Object Slides of quartz, ground vertical to the optical axis, 0.6 mm thick, size 25x30 mm each “ 4.5 5.58 10 Object Slides of U V Glass. about 0.2 to 0.3 mm thick, size 20 x 30 mm.. 5. 6.20 5 Aluminum Slides, as designed by Heidenhain 2. 3.10 5 Cover Glasses, of fused quartz 3.735 4.65 Stage Micrometer, 1 mm divided into 100 parts, | on quartz slide under a cover glass of fused quartz with one Heidenhain aluminum slide 5. 6.20 Stand ITI E with large mechanical stage, 1.40 N.A. 91 113.15 Horse shoe cast iron Base Plate 2. 3.10 Short Optical Bench, with three set screws and column for the collector............... iH 6.60 Spark Stand, for horizontal electrodes Bae 20. 26.40 Projection Lens Carrier, with slide for the collimator, on saddle stand, without micrometrical movement Ke 3. 4.62 Collimator of quartz, of long focus ry: 6 8.25 Prism Platform with two prism mounta screwed upon it, on saddle stand 5s 7.59 2 Prisms of quartz, refractive angle 60°, with refractive surface about 3 cm high and 5 em wide, inclined by 60° to the optical axis of the crystal.......... : seoodoassna 25. 33.00 10 meters Cadmium Wire saan cen acnaatee ; aosbO0e goosatae 2. 3.30 10 meters Magnesium Tape............-.-.--22.-----.00- -99 Induction Coil, series HB, without condenser : 45, 59.40 Electrolyte Contact Breaker, Simon, with porcelain ‘nozzle....... ll 14.85 Resistance: Coil ce aac nectar paenenbsoneeoossnlas chatecoed soc : 12 15.84 Amperemeter, Type AG, for 1 to 5 amperes, aperiodic ade aSa6bdc - 5 . 9.98 13.17 Switch, for cut-off BooUSeEdbanToaseadecsobocucunode soddc os 1G 2.31 Fluorescent Screen, 3 x 9 cm - -50 Condenser, consisting of two Leyden jars a5 Hodan kisah eee ere 11 14.85 Burner.... soe : oe Bagot nocGnade 6 8.25 Table top and case for the illuminating apparatus nee ee wae : ne 12.50 16.50 Switch-board.................. Adio cAGRODtSS speleie 56 35.00 46.20 Wire and montage Betas lafelaiciaiciafaic cictetclen\sisiste ieee etre riets aie wicieraieesctoehete 12.50 16.50 Support for the camera... 4.25 5.61 Complete Micro- photographic Outfit for Ultra-violet Light, as above listed. 785.73 1037.15 ACCESSORIES FOR USE WITH MICRO-PHOTOGRAPHIC OUTFITS. Micro-Tessar Objective, Bausch & Lomb, Zeiss, constructed after the formulae of the large photo- graphic lenses of the same name and particularly well adapted to photo-micrography. The angle of view is 55°, the illumination is uniform and the definition rem sharp. Each is mounted with a metal iris diaphragm and provided with a society screw. 72 mm equivalent FOCUS e/a. 5. face atela. spaces era Sieve araceee ont tava oilers |svtie pate Soret he ener ca crete erro neite he ental tea 32.00 Micro Tessar Objective. Same as above, but with 48 mm equivalent focus: «.. .. o%,..08 eee 26.00 Micro Tessar Objective. Same as above, but with 32 mm equivalent focus.................... 26.00 Doublet:Rocusing: Glass «oj. oss cccciessses ta at case noha ee EE EOE ee Eee ee Pe sire c 4.00 Achromatic'Focusing ‘Glasss<-c 235.5. 25.25.2 205 os.ac ocatasore Pave tee niole oe sre ee ee OO eee 8.00 Light Filters, Wratten and Wainwright, Set of 9, etc., for micro- )-photogr aphy, cemented between glass, 2 inches square. Dutyehreere eos scien seul) Duty Paid: 2. eee 11.10 View in Salesroom Showing Microscopes, and Accessories, Apparatus for Cement and Asphalt Testing, etc. 342 EX VS IR Nel WR: H, te ‘Hiv -Om (Mtr "Ay Ss CeO} MR Ay IN < fee Cine Rg No. 33600 No. 33612 No. 33624 No. 33636 MICROTOME, STUDENT, BAUSCH AND LOMB, suitable for individual and elementary laboratory use. Feeding Mechanism—Operated by hand; consists of accurately cut micrometer screw of 0.5 mm pitch, provided with a disc graduated into 100 parts each equal to 5 microns, the edge having 100 teeth which engage with a click and secure perfect control of the feed; whole supported in a metal stirrup, permanently attached to front of stand. Object Clamp—Of one piece, extremely rigid; when fully extended will accommodate objects measuring 30 x 22 mm; adjustable vertically and orienting in one plane; may be attached at either side of vertical slide for paraffin or celloidin works. Dimensions—Length, 240 mm; width, 127 mm: height, 146 mm. Possible Attachmen Ticrotome regularly furnished without knife; plain knife No. 33744, 90 mm, with holder No. 33772 or shanked knife No. 33752 are reeommended; CO: Freezing attachment can be fitted to this instrument. 33600. 33604. 33752. MICROTOME, MEDIUM LABORATORY, BAUSCH AND LOMB, as widely used in hospital laboratories. Feeding Mechanism—Operated by convenient hand lever; can be set by simple movement of the quadrant to feed any thickness from 2 to 60 microns, in steps of 2 microns; provided with split nut which releases carriage at any point of feed, enabling it to be returned to any point at once; whole supported in metal stirrup permanently attached to front of stand. Object Clamp—Of one piece, extremely rigid; when fully extended will accommodate objects measuring 35 x 32 mm, adjust- able vertically and orienting in one plane; can Le set at either side of the vertical slide for paraffin or celloidin works. Dimensions—Length. 300 mm; width, 143 mm; height, 188 mm. Case—Microtome supplied in strong wooden box with handle. Possible Attachments—Microtome regularly furnished without knife; plain knife No. 33744, 125 mm, with holder No. 33772 or shanked knife No. 33752, 125 mm, are reeommended; CO: Freezing attachment can be fitted to this instrument, as can the Naples Universal Clamp. 33612. Medium Laboratory Microtome, without knife and holder, as described.......................- 45.00 33616. Plain Microtome Knife, 125 mm, without handle, in case, but with No. 33772 Knife Holder.... 6.50 Feeding Mechanism—Automatically operated with stroke of knife by arm extending from rear of knife block—also provided with lever for hand feeding; controlled by adjustable cam with graduated knurled button and spring click, giving feed of 2 to 36 microns in steps of 2 microns; provided with split nut having convenient handles and with releasing lever, enabling carriage to be released at any point of feed and to be set at any desired position on the feed instantaneously; whole sup- ported in a metal stirrup adjustable laterally along front of stand and secured in any position by clamping screws. Object Clamp—Of one piece, extremely rigid; engages rigidly with slide; when fully extended will accommodate objects meas- uring 35 x 32 mm; adjustable vertically and orienting in one plane; can be set at either side of the vertical slide for paraffin or celloidin works. Dimensions—Length, 344 mm; width, 158 mm; height, 218 mm. Possible Attachments—Microtome regularly furnished with knife; plain knife No. 33744, 165 mm, with holder No. 33772 or shanked knife No. 33752, 165 mm, are recommended; Ether Freezing attachment can be fitted to this instrument, as can the Naples Universal Clamp. 33624. Automatic Laboratory Microtome, without knife, as described..................cceececceceeeees 65.00 33628. Plain Microtome Knife, 165 mm, without handle, in case and No. 33 33752. Shanked Microtome Knife, 165 mm.......... 343 No. 33644 No. 33652 MICROTOME, MINOT ROTARY, BAUSCH AND LOMB, as designed by Dr. Charles S. Minot of Harvard Uni- versity and improved from time to time during the past twelve years. The most widely used and satisfactory instrument for paraffine cutting. (See illustration on preceding page.) Feeding Mechanism—Consists of a micrometer screw revolved by a large ratchet wheel which engages a pawl; amount of feed controlled by a cam; wheel provided with knurled head which permits fine adjustment of object in relation to knife with pawl disengaged and held off wheel by spring catch; cam dise graduated in single microns, numbered from 0 to 25, and operated by knurled head; micrometer screw fitted with split nut provided with handles and releasing lever, by means of which feed can be instantly brought to beginning, or any intermediate position, and held; feed wheel protected by strong iron guard of neat design. J Object Holder—Consists of disc 25 mm in diameter, adjustable in mounting which permits of orientation to give any desired cutting angle; securely held in position by convenient screws; moves on a vertical slide actuated by a crank operated by a heavy balance drive wheel with handle and stopped when desired by convenient locking device. Knife Block—Consists of heavy iron casting which is attached to base and holds knife in fixed position; adjustable to and from object and from side to side to permit use of entire cutting edge; knife clamp may also be tilted in its support to set angle of cutting edge as desired. Dimensions—Length, 196 mm; width, 212 mm; height, 214 mm. Case—Supplied in strong wooden box with handle. Possible Attachments—Regularly without knife, unless otherwise specified; knife No. 33744, 125 mm_blade, without handle is recommended and can be included at its additional cost; rotary object clamp, No. 32732 or No. 33728, can also be attached, P and the ribbon carrier, No. 33720. . ‘ A ‘ 33636. Minot Automatic Rotary Microtome, without knife, as described with three object dises......... 75.00 33(44. Knife; 125:mmi blade; without handle im case... 0. .c coc. deco sce see elec see ieee . 4.75 MICROTOME, MINOT SIMPLIFIED ROTARY, BAUSCH AND LOMB, designed to meet the demand for a Rotary Microtome at less expense than the original Rotary No. 33636. Feeding Mechanism—Consists of a micrometer screw revolved by a ratchet wheel which engages a pawl; amount of feed con- trolled by a cam; wheel provided witb a small handle, permitting fine adjustment of object in relation to knife with pawl disengaged and held off whee! by spring catch; cam dise graduated in steps of 2} microns, up to 25 microns, and operated by large knurled head. Object Holder—Consists of disc 25 mm in diameter, having fixed ball on stem universally adjustable in socket holder; can be oriented to give any desired cutting angle and securely clamped in place by convenient screw; stem of dise projects through holder permitting convenient adjustment from the rear, holder moves on a vertical slide actuated by a crank which is operated by a heavy balanced drive wheel with handle and stopped by a convenient locking device. Object holder on Minot Automatie Rotary Microtome No. 33636 can be substituted for that above if desired. Knife Block—Consists of heavy iron casting which is attached to base and holds knife in fixed position; adjustable to and from object and from side to side to permit use of entire cutting edge; knife clamp may also be tilted in its support to set angle of cutting edge as desired. Dimensions—Length, 196 mm; width, 212 mm; height, 208 mm. Case—Supplied in strong wooden box with handle. Possible Attachments—Regularly furnished without knife, unless otherwise specified; knife No. 33744, 90 mm blade without handle is reeommended; rotary object clamp, No. 33732 or No. 33728 can be attached, as can also the adjustable knife holder. 33644. Minot Simplified Automatic Rotary Microtome as described, without knife and with three object ISOS: ooo RNS SS Sik 4b 08 ow ee She sa sO INO Fine eer ne ee 40.00 33744. Knife; 90mm blade, without handle, im case...) ccs. one oe een ee 3.50 recently improved under the supervision of Dr. Minot is unexcelled, we believe, for all around work of the most accurate nature. It is intended for very precise section cutting of large specimens, either paraffin or celloidin, but can be used for serial work as well and has given eminent satisfaction in some of the most exacting laboratories of the world. FEEDING MECHANISM—Consists of a micrometer screw with an available feeding length of 38 mm, turned by a large ratchet wheel which engages a pawl and is controlled by a cam; cam dise graduated in single microns, numbered from 0 to 25, and operated by knurled head, micrometer screw fitted with our split nut provided with handles and releasing lever, by means of which feed can be instantly brought to beginning, or any intermediate position, and held; feed wheel protected by metal cover of neat design. With rack and pinion device for raising and lowering object clamp. KNIFE SUPPORT—Consists of oblong frame, carefully machined, with T-slot on all four sides and having two knife clamps moy- able in slots to place knife at any horizontal angle with relation to object. DIMENSIONS—Length, 405 mm; width, 194 mm; height, 245 mm. POSSIBLE ATTACHMENTS—Microtome regularly furnished without knife; Minot knife, No. 33660 is listed for use with this model; adjustable knife clamps No. 33664 for tilting; Zabriskie object clamp No. 33656, can also be attached, as can the ribbon carrier, No. 33724. 33652. Minot Automatic Precision Microtome, without knife, as described....................-...5-- 125.00 33656. Zabriskie Clamp for large objects, for use with above Microtome only.................-....-.- 15.00 33660. Minot Knife, length 315 mm, in case...............- ee ee Tae Acdtoanscncs 15.00 33664. ‘Tilting’ Knife’Clamps for Precision Microtomes: ss.-s.. 26 os. 22 2. ioe ce ke ei ee eee 7.50 33668. Minot Automatic Precision Microtome, with Zabriskie Clamp for objects 100 x 80 mm and less and with special clamps for elevating and tilting knife, as used at Rockefeller Institute for Medical Research, Neurological Institute and College of Physicians and Surgeons of New York City, ete. Complete 147.50 344 33672. 33676. 33680. 33684. 33688. No. 33672 Microtome, Large Brain, Sartorius, for cutting whole brain sections to a thickness of 15 microns. As used in leading neuropathological laboratories in both the United States and Europe. Will take a preparation 210 x 210mm. The sectioning is done by the celloidin method and the knife oper- ates under the surface of the alcohol. Special CO» freezing device may be used in connection with this microtome for freezing whole brain sections at extra price. Price includes one knife 45 em long and wooden table for the microtome. Duty Free... ..... 420.00 DutyPaide en tee eer ee oe 560.00 Knife and Clamp to hold same in rectangular position for paraffin sections. Dutysrees. a. ese _ 30.00 DutysPaid-. 4.5.6. ...-. 40.00 Extra Knife, 45 cm long for celloidin. Duty Eree-- 42. so . 21.60 Duty aide epee See et OO OU, Object Disc, regular. Duty Free...... near LOD Duty aides eee eae ee 20.00 Object Disc, with cl: amp. Duty Free..... oe 21.00 Duty Paid. _... sanue see. 2S) No. 33692—Attached to CO» Cylinder No. 29548 33692. Microtome, Freezing, Sartorius, suitable for both paraffin and celloidin cutting but widely used as the most convenient form of microtome for quic +k sectioning of specimens frozen by means of CO». With automatic adjustment for sections down to 5 microns in thickness. Including object clamp, two knives with box and springback for honing, embedding dise, and CO» freezing aitschment but without CO2 Cylinder. Duty hreetesc- eee 37.2. Stocktne seca ere 50.00 Note:—Because of the U.S. law eaiicing registration of cylin Ww 1 COz is No. 33692 sold we recommend the use of U. 8. Standard Cylinders. See p. 252. 345 No. 33696 33696. 33700. 33704. 33708. 33712. 33716. 33720. 33724. 33728. 33732. 33736. 33740. No. 33700 No. 33704 No, 33720 No, 33712 No. 33728 No. 33736 No. 33740 Microtome, Hand, Bausch & Lomb. This convenient little microtome is carefully made and neatly finished. While designed primarily for cutting sections of stems and roots, it can be used for both animal and v egetable tissues. The feed is accurate and effected by means of a micrometer screw, the collar of ‘which is graduated in steps of 25 microns each. Without knife........ Microtome, Table, Bausch & Lomb. This model attaches securely to a table edge or similar support and is adapted to all kinds of sectioning for thicknesses of 5 microns and over. It is used largely in work preliminary to surgical operations and by students in ordinary laboratory work. With- Out kmifern cee. Seweccss oad cciue ncn go05tin wgeesoe scene o See cle deece ee eee eee aaa 12.50 Microtome Bardeen CO, Freezing, Bausch & Lomb. This instrument was originally designed by Prof. C. R. Bardeen, formerly of "Johns Hopkins University, now of the University of Wisconsin. It is indispensable for clinical work where sections of morbid tissues are required during an oper- ation. The knife slides on glass guides. The finest feed is 20 microns. The object disc is scored concentrically and measures 36 mm in diameter. The microtome may be attached directly to a CO. cylinder. We recommend for use with this microtome a special knife No. 33708 with handle to fit the hand: Without: knife... 222... ..gsce eens ae oe ae ee ee ee 16.00 Special ;Rintfe a5 aa jack heise o c.o le ccc os. w nian: Siniaeicissiods else one ee See 4.00 CO, Freezing Attachment. The freezing device in this attachment consists of a small metal cylinder. The object i is placed on the flat disc top of the cy linder, which measures 36 mm in diameter, and is frozen by the expansion of the CO». This device is connected with the gas cylinder by a flexi- ble copper tube, provided with a connecting nut for joining to the cylinder and the necessary adapter for fitting to the microtome. We furnish it also with an extra valve, which can be placed at either end of the tube. This attachment may be used with Students, Medium Labor- etary: Automatic Laboratory or Table Microtomes. Complete with valve, but without exter (0) a ©} 0 SSR REAaCRar ane anno C Gre oO ROnUo MMe ENrnenD SOObOGsOUUaOa Domo aooSocccrencl i 4 CO; Freezing Attachment as above but without valve... .. 02. acs. 11.50 12.50 12.50 Glassware for Babcock Test, in accordance with the specifications formulated by the U. S. Bureau of Stand- ards for standard Babcock glassware and adopted by the Official Dairy Instructors Association. 33964. Milk Test Bottle, 8%, 18 grams, so-called ‘‘6 inch” bottle. Each................20.ccceeeeeeee- BZD) 33968. Cream Test Bottle, 50%, 9 grams. Length, inches..................:2+2.0+0ee+ss sees XC es Cn ero eects esc state So oval SieToRe wLS aN Sia elo! teks Gosucyaveha.cio.d Rayne RI eter ee ee eee ae 40 45 33972. Pipette, Babcock, delivering 17.6 cc in 5 to 8 seconds at 20°C. Each.................0--222002: -20 33976. Skim Milk Bottle, double bore. Patent. Graduated in.................. 02 eee eee eee zoo tao Bah too oi5.ciscco saseisse aefe ror elajainieseing Suueis Soa nad 4.3 ¥ebele Celso ees ae MSR ees 50 -50 33980; Acid!) Measure, 17.5) CC. <5)... 5.c)ecescseiccae asia) tose roresie einlece aiblels jaye, o 0 ded faleses a. n1nVe OSLO OES CARR eR ee -10 33984. Acid Burette. Number of 17.5 cc charges......................-5 3 6 12 JOEY (OARS Cee 6 MEE Sms 6 Gas moe Gee Comte ace 2.00 2.00 2.50 3.00 33988. Combined Acid Bottle and Pipette. For storing acid and delivering charges of 17.5 cc......... 5.00 33992. Milk Tester, Heeren (Pioscope), for determining the richness of milk by comparison with standard (40) (0) d: Weenie ee een Aare aaa an aero Ru cena ciddcimmccidcg oOconconcase. once. : 33996. Paper, Schleicher & Schiill, No. 571, fat extracted for milk analysis. See M.A. Adams, “Analyst,” 1885, p: 46. “In strips 56 x165.mm. \Rer50strips:........ «0.00.2 nici entire eens 1.75 34000. Slide Rule, Richmond, for calculating the total solids in milk......... sina Chee es foes 4.00 350 OF} Me ASS Cee OF Mi Pe Ay ING eX eRe dk) JUS CR H. we del No. 40300 No. 40308 No. 40312 40300. Balance, Torsion, for cream test, with sliding tare weight, weight pan, special bottle holder and arrest; sensibility 1 centigram; with special 9 and 18 gram weights. MON DOLLIES wre mcrarermere oecrarerat cet stssra aya cote tere oerereb rater eucasineteresisnorees ota aseks 1 2 4 LOE Eb abacdnte node be coders Gapopsnapberee cn oooh. bo osngeconbisABeEae 12.00 13.00 15.00 40304. Fat Extraction Tube, Rohrig, for use in the Rose-Gottlieb method; 46 em high with a capacity to base of neck of 873 ce. The delivery tube with stopcock is so placed that its center line coincides with the surface of 23 cc of liquid in the main tube. With polished wooden base with indentation for flask, but without flask as shown in illustration. As used in the Dairy Laboratory, Bureau of Chemistry of the U. S. Department of Agriculture..............5:.2.cc5csee cece e eee s eens 22D 40308. Galactometer, Adam, with two bulbs and glass stopcock....... 2... 2.2.20. eens 2.50 40312. Automatic Reckoner, Ackermann, for dry substances in milk, with directions.................... 2.00 View in Salesroom showing special stands for the display of Beakers, Flasks, etc. 351 AY SR i He UPR Hi le Ee Oe Mar AN aS ECs 700 OM) Re Ay Nay MINERALOGY, CRYSTALLOGRAPHY, PETROGRAPHY, ETC. Note—We are enabled to offer by special arrangement with the maker, the optical measuring instru- ments for Crystallography as designed by Prof. Victor Goldschmidt, of Heidelberg. Original catalogue is sent on application. No. 40416 No. 40404 No. 40420 40400. Goniometer, Grinding, Goldschmidt, complete as described in Zetlschr. fir Duty Free Duty Paid Krystallogr. 1912, Bd. 51, Seite 359........... ST ee ona dos oat onc 690.00 920.00 40404. Goniometer, Two-Circle type, Goldschmidt, Model 1910, complete as described in Zeitschrift fir Krystallogr., 1898, Bd. 29, Seite 883................-- 360.00 480.00 40408. Goniometer, Two-Circle type, Goldschmidt, as above, simplified model.... .. 240.00 320.00 40412. Accessory to the above for the photography of oriented specimens ............. 21.00 28.00 40416. Application Goniometer, Penfield, pocket form, from stock.................. 1.25 40420. Crystal Modeling Apparatus, Goldschmidt, as described in Zeitschrift fir KG StGLLOgT e190 Ot DOLTAD IS ELLETO OEE Ree en eer een eee 120.00 160.00 40424. Mineral Sectioning Apparatus, Wilfing:.....-.---5-- 25 s42s62 oe + eee 11.40 15.20 40428. 40432. 40436. 40440. 40444. 40448. 40452. 40456. 40460. 40464. 40468. 40472. 40476. 40480. 40484. No. 40432 No. 40440 No. 40448 Goniometer, Goldschmidt, large model, for the measuring of very large crys- tals, complete as described in Zeitschrift far Krystallogr. 1910, Bd. 47, Duty Free Duty Paid SGU UB Oto cr Cn See erniticnD Sone COORTTO One Taare Eerie nroon ote 540.00 720.00 Application Goniometer, Two-Circle type Goldschmidt, an improvement of the 1896 model, as described in Zettschrift fiir Krystallogr. 1896, Bd. 25, Seite SOT sayy Sins sua ees tetera teres ae ke rer sista eralionn so) tye v8 2 6 ste yeus wild eeieeere aus 018 tesa eeatas Tie nays oreranevale faves 11.40 15.20 Axial-Angle Apparatus, Wiilfing, complete in accordance with Newes Jahrbuch jureManeralogie, 1899) Beil. Ba: 12) Sevte| 848.522 50.0 seeeeee ss eee. 150.00 200.00 Tourmaline Tongs, with condensing lens. Price varies in accordance with the perfection of the tourmaline plates. A good specimen may be had for 7.50 10.00 Tourmaline Specimens, mounted in cork mounts, 48 x 28 mm, for demonstration of optical properties of crystals in polariscope, dichroscope, etc., and very suitable for use with tourmaline tongs, and illustrating all of the six crystal systems, are to be had at prices varying in accordance with the perfection of the specimens. On this account it is difficult to list these specimens but complete lists of the best European preparers will be sent on application. Grinding and Polishing Machine, Gasser, designed especially for the preparation of micro sections of bones and teeth. The table is rigidly constructed and is 1 meter in height, and is provided with a zine dish in which the revolving lap operates, so that grinding may be done under water if necessary. The electric motor drives the lap at a speed of 1500 r.p.m. while above the table a heavy support carries the specimen spindle, provided with knob for hand guidance and adjust- able ring for regulating the thickness of the specimen. The specimen dises are 5 cm in diameter. Bone sections may be ground and polished completely in ten minutes and teeth sections in 20 minutes. Outfit consists of apparatus with motor (Voltage must be specified in ordering), start- ing rheostat, connecting plug, two 15 cm grinding dises of different degrees of fineness, one 15 cm metal dise for polishing and four speci- Duty Free Duty Paid MED? GISGSH- eters overnite ler. ec Sen ee cee Gna ccc coe O oa 66.00 80.00 Extra Grinding Discs, 15 em, each..._. See a ERATE ag 1.65 2.00 ‘© Polishing Discs, 15 em, each. . Shh nets a Ses : 3.00 3.60 *« Specimen Discs, 5 cm, each..... TOS ARE O TE c ONTO -70 -80 Grinding and Polishing Machine, for minerals and metals, identical in construction with above but with gear providing a speed of 2000 r.p.m. to the grinding dise and with disc 20 em in diameter. With automatic gear for rotating the spindle carrying the specimen disc during the process. Removable lead weights provide means of regulating the pressure upon the specimen dise when automatic gear is used. An adjustment ring upon the spindle automatically ends the grinding when the desired thickness of specimen is reached. Outfit consists of motor (Voltage must be specified in ordering). With rheostat and connecting plug, two 20 em grinding dises of silica- carborundum compound of different cutting capacities and 20cm disc DutyFree Duty Paid of metal for polishing and two specimen discs 5 cm diameter........... 92.40 112.00 Grinding and Polishing Machine, as above, with two specimen spindles for simultaneously grinding two specimens and with four dises............. 118.80 144.00 Grinding and Polishing Machine, as above, with four specimen spindles for simultaneously grinding four specimens and with eight discs.......... 151.80 184.00 Extra Grinding Discs, of Silica-Carborundum, 20 em diameter, each... 6.60 8.00 “© Polishing Discs, of metal, 20 cm diameter, each................. 4.00 4.80 «* Specimen Discs, each........ Stele ha er Bese Sees hepeceeerags ce -70 -80 353 > < i Hy 3U aR Elie ie He 10) Me Ayes € 10) IMp GBS An SN No. 40488 GONIOMETER, HUTCHINSON UNIVERSAL, for use as an ordinary goniometer for the measurement of angles, 40488. 40492. 40496. 40500. 40504. 40512. 40516. as an axial-angle apparatus, as a Mohlrausch total-reflectometer and for determining refractive indices by the prism method. It is intended primarily for the examination of small crystals and by its aid all the usual crystallographic and optical determinations can be readily carried out. In its design the attempt has been made to combine efficiency with simplicity and strength of construc- tion, together with adaptability to a great variety of purposes. A circle D, five inches in diameter, graduated to } degrees and reading by a vernier to minutes, is supported by a stout bracket S, at a height of ten inches above a flat base-plate P, eleven inches square. The circle is provided with a slow- motion attachment, and can be clamped by the screw HE. A steel rod, wnich can be clamped at any convenient position by the screw F, passes through the centre of the circle and carries, at its lower end, the ordinary centring and adjusting arrange- ments shown at G. A loose collar, which can be clamped to the rod by the screw R, gives the means of raising the adjust- ing head and of again lowering it to its former position. A telescope A, and a collimator C, are securely clamped to the base-plate in the manner shown at K, a number of hoies being provided for ‘this purpose at convenient positions. The object-glasses of the telescope and collimator are } inch in di- ameter and about 4 inches in focal length. Their tubes are carried by collars, provided with adjusting screws. An addi- tional lens of 2} inches focus is also supplied. This can be slipped into position in front of the objective of the telescope, thereby converting the latter into a microscope of low power with which the crystal can be examined. The telescope and collimator are placed at any convenient angle to one another (some angle between 60° and 90° will be found suitable), and the microscope B is arranged so that its optical axis bisects the angle between them. The microscope tube, which is eight inches long, is moved by an ordinary coarse adjustment actuated by a pair of milled heads, one of which is seen in the figure just below the telescope. At one end it carries the fitting of an objective changer of the Zeiss pattern which enables different objectiv es to be rapidly slipped into position and provides a means of adjusting them to the axis of the microscope. Objectives of } inch and of 2 inches focal length will be found the most generally useful, but others can be employed if desired. At the other end a nicol NV slips on over the eye-piece; the latter and the nicol-holder are slotted to admit of the insertion of a quartz-wedge or mica-plate. A Bertrand lens L slides into the body of the microscope. An adjustable table 7, which can be levelled by the screws W, is carried by a steel rod which can be clamped by the screw Q; a loose collar clamped to the rod by a screw enables the table to be rotated when supported at any convenient height. On this table can be placed a tank, when it is desired to observe the crystal immersed in a liquid. Two extra fittings, not shown in the figure, are also provided. One enables a short tube containing a nicol and a con- densing lens to be placed opposite the objective of the microscope. The other can be clamped to the graduated circle: at its lower end it carries a collar into which the telescope A can be screwed, thus enabling the latter to be supported at the same height above the base-plate (3} inches) as the collimator and microscope. Universal Goniometer, as above, with 2 inch and 4 inch microscope objectives Duty Free Duty Paid and centeringvobjective changes! .. a1... sco. snes ence coer eieine 210.00 280.00 Special Objective, with centering changes and webbed eyepiece for using microscopelas) a telescoper.cssn goss oe) eas fee eee te eee Eee eee 15.00 20.00 Glass Tank, with optically plane face and Centigrade thermometer......... 5.60 7.50 Sliding ‘tanktholder=. oe eee en ee eae eee ee 6.00 8.00 CaseNforicompleteroutnusee eee eee ree e nen RR ete pein OUEST 12.00 16.00 4, nat.Gr. 2/ /onat.Gr: No. 40516 Duty Free Duty Paid Dichroscope, von Lang, improved form, in case...............----- eee eee eee 4.20 5.60 Dichroscope, with revolving stage and graduated circle, with spectroscope BECRCHMON ta reso een eee Te eer Ek ae 12.00 16.00 B&L.O.Co, No. 40520 MICROSCOPE, BAUSCH & LOMB PETROGRAPHICAL, RESEARCH MODEL LD. This microscope, except for certain mechanical details, is patterned after the microscope described by F. EL. Wright in Amer. Jour. of Science, (4) 29, 407-414, 1910; also in “The Methods of Petrographic Microscope Research,” Carnegie Institution of Washington Publication 168, 1911. The special features of this research model are :— Large Abbe Aplanatic Condenser, N. A. 1.40, which, together with an Ahrens prism of 20 mm aperture, can be used both with high power and low power objectives. Special Mounting for Polarizer, which can be swung in and out of axis of microscope at will. Large Sensitive Tint Plate mounted in rotating carrier below condenser. This arrangement is superior in two respects to the usual method of inserting the plate above the objective: the optical system is not disturbed on insertion of the plate; the mounting enables the observer to rotate the sen- sitive tint plate and thus to vary at will the intensity of field illumination produced by the plate, also to pass from one quadrant to another. In very weakly birefracting minerals it is essen- tial that the field illumination from the sensitive tint plate be very weak; otherwise the faint interference colors from the fine mineral grains, either in parallel or in convergent polarized light, will be veiled and lost to view in the intense illumination of the field produced by the sensitive tint plate in the usual diagonal direction. Large Mechanical Stage, simple in design and construction and practically dust-proof, with a play of 24 mm in two directions at right angles, the divisions on the screw heads reading to 0.01 mm. 399 ~< AD IR Ae Ee Ula Hie ier HIS 20 IMapvAg ss Cc JM iIRe TAS ON MICROSCOPE, PETROGRAPHICAL (continued) Large space between stage and arm, necessary for manipulation of universal stage and other acces- sories; also for opaque mineral investigations in reflected light. Objective Clamp and rings of case-hardened steel. Device for simultaneous rotation of Nicols. Wide Draw Tube useful for photomicrographic work. Entire analyzer carrier included within body tube and thus protected from dust. Even when the analyzer is withdrawn from axis of microscope, it is still within the tube. Bertrand lens slide accurately constructed to insure exact centering. Below the Bertrand lens is an iris diaphragm and above it a small lens on an arm, which, together with eyepiece, forms a micro- scope focused on the plane of the iris diaphragm and enables the observer to bring the image of the object on the stage to coincidence with the plane of the iris diaphragm and thus to insure elimination of stray light from adjacent mineral grains in the case of the measurement of the optic axial angle of a mineral grain or plate in a specimen. Rack and Pinion movement for Bertrand lens, permitting one to raise or lower it and thus change the magnification of an interference figure from one to two diameters. Specifications of Stand Arm—Curved type, providing ample vertical distance from stage to arm of 60 mm; horizontal distance from center of stage to base of arm, 80 mm. Tube—Body tube, 55 mm outside diameter, with inner tube adjustable by rack and pinion (two heads) through a range of 25 mm; inner tube contains a Bertrand lens, with an auxiliary lens above it and an iris diaphragm below it, each adjustable from the right hand side of the body tube; draw tube slides in metal fitting graduated in single millimeters and numbered 160, 170 and 180, taking standard sized (23 mm) eyepieces, which are supplied here with cross-hairs and the eye-lens adjustable for focusing upon them; notch in the upper edge of draw tube fixes azimuth of the eyepiece; within the lower portion of the body tube the analyzer is mounted to slide in and out of the optical axis on the rotating arm; 45° slot in body tube with dust-proof shutter placed just beneath the analyzer for acces- sories; provided with non-detachable nose-piece, centering by means of two screws working at right anglesin N and E positions. Focusing Adjustments—Coarse adjustment by standard rack and pinion; fine adjustment of Bausch-Lomb lever type with micrometer screw head graduated in 100 parts, each equal to .0025 mm in vertical movement, and provided with a vernier sliding vertically to follow rise and fall of micrometer head for reading to .0005 mm: mechanism ceases to act when objective touches slide. Stage—Revolving, with clamping device to set in any desired position; circumference graduated in single degrees with each tenth line numbered, the two verniers reading to 0.1°; two additional verniers, also reading to 0.1°, are at- tached to the support of bar connecting nicols; outside diameter of graduated circle, 112 mm; mounted on the re- volving stage is an adjustable stage plate, 95 mm in diameter, with mechanical cross movements actuated by grad- uated heads set 90° apart, the graduations reading to 0.01 mm; stage aperture, 32 mm, with reducing dise having an aperture of 19 mm. 3 Substage—Adjustable by rack and pinion; carries condenser, iris diaphragm, selenite plate and polarizer. Illuminating Apparatus—A planatic condenser, 1.40 N.A., with upper two lenses removable, giving 0.40 N.A. with lower lens alone; placed in fixed substage arm with small set-screw and is easily removable; iris diaphragm below condenser; mirror, plane and concave, 50 mm in diameter, with fork in socket adjustable along substage support. Polarizer—An Ahrens prism in revolving mount attached to swinging arm, permitting complete removal from optical axis; above the polarizer, attached to the iris diaphragm mount, is a revolvable carrier for sensitive tint plate (20 mm outside diameter), itself carried in sliding mount allowing withdrawal from, and return to, optical axis. Analyzer—A Thompson prism, revolvable a quarter turn, insliding prism-box, allowing withdrawal from, and return to optical axis entirely within the body tube. : : Simultaneous Rotation of Nicols—Rigid bar is supported at plane of stage by arms moving through 90°, with two verniers to provide for reading angle of rotation; connection arms, with broad bearing surfaces, extending from analyzer and polarizer carriers engage bar in such a way as to permit free movement of body tube and substage wnen focusing and to eliminate lost motion; bar is movable in its support for instant release of arms, allowing inde- pendent rotation of polarizer or analyzer; a clamping device with milled head on one of the verniers sets the bar support against rotation, to permit tne principal nicol planes to be set parallel with cross-hairs of eyepiece and to provide for rotating specimen on stage rather than rotating connected nicols. ‘ Changing Nosepiece—Consists of two parts:—the upper one with clamp permanently attached to centering nosepiece, the lower, a ring threaded to take objectiv2; ring and socket in which it fits made of steel forlong term service; with ring for each objective quick interchange is provided for. i Accessories Included—Bertrand lens, mounted; one selenite plate, mounted, to fit substage; one slide-plate to carry blue glass an ground glass for insertion below condenser iris diaphragm when sensitive tint plate is withdrawn from optical axis. eitets aL racial parts in alcohol-proof black; smaller adjusting heads and bar nickel-plated; graduated circles in Ger- man silver. Case—Of hard wood with polished finish, fitted with brass lock and key. Outfit | Objectives Cross- Hair Quick Changing Eyepieces Nosepiece | Price 40520. LD 16mm, 4mm tid <, Ob. With two rings | $311.75 40524. LD | 32mm,16mm,4mm | 7.5. 10, 12.5x With three rings | 320.00 For the measurement of the optical constants of mineral grains and plates, the following accessories are essential: 40528. Universal Holder and Positive Eyepiece to be used with the following accessories.............-. 15.50 40532. (a) Graduated Quartz Compensator for the measurement of birefringence.......... 17.25 40536. (b) Bi-Quartz-Wedge Plate for the measurement of extinction angles................ 19.50 40540. (c) Co-ordinate Grating, 0.1 mm divisions, for the measurement of optic axial angles and for statictical mineral volume analysis after the Rosiwal method or the percentage area Method § i). cress Sseyatetis sete eves Bee lcididis g SUS RS Ene egies Ue een 10.00 40544. (d) Cap Analyzer with 2° graduations for use above positive eyepiece, fitting into recessed plate with means for a sufficient rotary adjustment to permit accurate setting of the index. point with zero of thejanalyzer. ...224.22-20- +20 eee eee eee eee 8.00 40548. Sliding Stop Eyepiece for the observation of interference figures from fine mineral grains; substituted for regular eyepiece; consists essentially of two adjustable slits at right angles with special eye- piece) for ‘focusing on’ the same nee nesaceeen socks es sac ccies oon Ae een een ane eee 12.50 40552. Adjustable Support for opaque objects; replaces condenser in substage; two adjustable screws set at right angles tilt the table in any direction desired; the object table revolves..............- 10.00 40556.. ‘New Model’ Vertical: Dluminator: .: 22.0505. 2200s ose eons es os tee 12.00 40560: _Petrographical’ Objective; 0:95 Ni. A], 4:5amml Hin Bes. eee ee ee eee 8.00 396 AL Re ae (Hy UCR H. i On eMerAy eS GeO: Mes Be Ay EN < No. 40564 No. 40572 MICROSCOPE, BAUSCH AND LOMB PETROGRAPHICAL TYPE LCH. The features of this new model are the unusually large space provided for manipulation of objects and super-stage accessories; the mount- ing of rotatable analyzer; the arrangement of the substage parts for quick change from polarized to ordinary and from parallel to convergent light. It is a high-grade instrument combining the efficiency and simplicity of adjustment which are commensurate with the requirements of laboratory work. In designing this instrument the Bausch & Lomb Optical Co., have had the kind assistance of Dr. Wright, of the Carnegie Institution of Washington, D. C. Tube—Body tube, 35 mm outside diameter; draw-tube, sliding in metal fitting, graduated in single millimeters and numbered 160, 170 and 180; having slot for Bertrand lens, with an iris diaphragm above it; taking standard size (23 mm diameter) eye- pieces, which are supplied here with cross-hairs and the eye-lens adjustable for focusing upon them; having two notches in upper edge for fixing the azimuth of the eyepiece; analyzer box slides in and out of body tube; slot in body tube with dust proof shutter placed just beneath analyzer for accessories; nosepiece with society screw thread, non- -detachable, cen- tering by means of two screws working at right angles i in N and E positions. Focusing Devices—Coarse adjustment by standard rack and pinion; fine adjustment of Bausch & Lomb lever type with microm- eter screw head graduated in 100 parts, each equal to .0025 mm in vertical movement, and provided with a hinged vernier for reading to .0005 mm, mechanism ceases to act when objective touches slide. Stage—Revolvable; circumference graduated in single degrees with each tenth line numbered, the double vernier reading to one- tenth degree in both directions; diameter of stage outside of graduations 102 mm, inside 90 mm; stage plate, vulcanite- covered, having inlaid for orientation two millimeter scales at right angles, 30 mm long, with each tenth line numbered. Substage—Adjustable by long-range quick-acting screw, turning to the left completely clear of the optical axis when screw reaches limit of downward movement; carrying condenser, iris diaphragm and polarizer. Illuminating Apparatus—T hree-lens condenser, 1.10 N.A.; upper lenses in swinging arm operated by knurled head at the side, pro- viding for quick change from convergent to parallel light without disturbing any of the other substage parts; iris dia- phragm below condenser; mirror plane and concave, 50mm diameter, on swinging arm with spring clip for central position. Polarizer—A Nicol prism (angular field 19°) in revolving mount graduated in 15 degree parts, each alternate line numbered—0, 30, sp 90 and so on up to 330; entire mounting with prism removable from optical axis by a double-swing movement to one side. Analyzer—A Thompson prism, revolvable a _quarter turn, in sliding-prism-box which carries graduations and indicator allowing aie return to optical axis without disturbing the reading on scale. Graduations in 5 degree parts, numbered , 30, 60 and 90. Changing Nosepiece—As shown in illustration, consists of two parts, the upper one with clamp screwing into centering nosepiece— the lower, a ring threaded to take objective. The ring and the socket in which it fits are made of steel for long service. With a ring for each objective, quick interchange is provided for. Accessories Included—One selenite plate, mounted, one quartz wedge, mounted, one Quarter Undulation plate, mounted, and Ber- trand lens, mounted; pinhole cap fitting draw-tube for observation of interference figures after Lasaulx method. Finish—Main parts including body-tube in alcohol-proof black, pinion heads and adjacent parts in natural brass color, adjusting heads nickel plated; all graduations in German silver. Case—Of hardwood with polished finish; fitted with brass lock and key. : Outfit Objectives Cross Hair Eyepieces Quick Changing Nosepieces Price 40564. LCH2 16mm 4mm vey WO S< With Two Rings 153.65 40568. LCH4 32mm 16mm 4mm (en >< MS IPAS With Three Rings 160.00 40572. Glass Model of Nicol Prism, Vrba, on adjustable support, 30 em in height, for lecture table use, duty LEE AROS cite SAC OD Ce He En EE ence Ie BeE ain MERE Ciao Ss Sal aie etcick Me ain Grom ore 7.35 ~ No. 40576 40576. Polarization Model, Vrba, consisting of four metallic rods with crosspieces of various lengths set at right angles thereto and representing :— LS The ether vibrations in an ordinary beam of light, i-e. vibrations in various plunes. 2 =< a plain polarized beam of light, i.e. vibrations all in one plane. 3.5 < ME “ “circular polarized beam of light, i-e. vibrations in a spiral plane, laevo-rotary. 4. <2 “ se “ “circular polarized beam of light, i-e. vibrations in a spiral plane, dextro-rotary. Setofcd models ee yee: oe one oa Aen ea ere eae Gapocopescaccovcrase: daescssao87 6.50 40580. | Glass Rhombohedron, Busz, for demonstration of double refraction in ecalespar, on adjustable support with base, duty free............ de wine it chtijarebieleln | SSR cles oe ee 6.75 No. 40584 40584. Models of Crystal Axes, a set of six wooden axes showing the axial arrangement of each of the six crys- tal systems, 15 cm size. When ordered with models, duty free... . ESAS Fic 5. 4.50 40588. Models of Crystal Axes, as above, 25 cm size, duty free. . ae : Be csc =< 6.30 No. 40592 40592. Models of Crystal Axes, consisting of a set of six metal supports with colored silk threads to indicate positions of surfaces. The models are 38 cm in size, with supports and are very well suited for lecture table demonstrations, duty free... 25... o02.oc-- 2+. cee oo 5 oe 2 dee See 24.00 40596. Models of Crystal Axes, as above, 50 cm size, duty free. .-.......-....2.......-+-- eee 30.00 358 Sammlung von30 Holzkrysfall- -Modellen No. 40600 40600. Crystal Models, Pear Wood, consisting of a set of 30 models demonstrating the simpler fundamental forms of the six crystal systems as follows :— I. Regular, Nos. 1 to 13. IV. Rhombic, Nos. 24 to 27. If. Hexagonal, Nos. 14 to 19. V. Monosymmetrical, Nos. 28 and 29. Ill. Tetragonal, Nos. 20 to 23. VI. Assymetrical, No. 30. Models, as above, with 5 cm models, in polished compartment case, from stock ......... 10.00 “ ss «é oe LOkema ss ss ¢ ss sopulGUtyIre@sa- tea. se LSet 40604. Crystal Models, Pear Wood, consisting of a set of 20 models supplementing the preceding set of 30 and which add some of the more ordinary combinations and twin developments. Models, as above, 5 cm size, in polished compartment case, from stock.................. 12.00 a LS 10 em “ “ se “ Gut yale Oe ry eve cu cect terees 17.40 40608. Crystal Models, Pear Wood, lecture table set of 30 models, each of 20 to 25 cm size, with blackened surfaces for marking with crayons. The arrangement of the models is exactly the same as in Seu Now40600)) Imponted: tororderionly,dutysirees- pene ses see eerie ceeees tees 24.60 40612. Crystal Models, Pear Wood, Hintze, consisting of a set of 80 models including the holohedral, hemi- hedral and tetartohedral forms, to which are added the designations of the new arrangement by Groth, Physikal. Krystallographie, 4. Aufl. and Liebisch, Grundriss der physikal. Krystallo- graphie 1896. Models, as above, 5 em size, in polished compartment case, duty free................... 21.60 66 SUSE Te iN()) are Sy ce ae sf pe uty stree wy WORe A cn eee 60.00 . \ Jat Wii wh ee. Naot OO | No. 40616 40616. Crystal Models, Glass, with colored silk axes, consisting of a set of six models representing the six erystal systems with a typical form of large size, i.e., 20 to 25 cm, from each system; specially adapted for lecture table use. In case without supports, from stock................+..e.+% 9.00 359 40620. 40624. 40628. 40632. 40636. 40640. 40644. 40648. 40652. 40656. 40660. 40664. 40668. No. 40620 Crystal Models, Glass, consisting of a set of 15 models of the same size and execution as the above but representing the more important fundamental forms of the six systems. In polished wood case; duty free.......... 14.40 Crystal Models, Glass, consisting of a set of 98 of the same size as above, i.e., 20 to 25 em, and same execution as the preceding sets, composed of six separate collections which may, if de- sired be ordered separately as follows: No. 40660 Crystal Models, Set B, 14 models showing the simpler pyramidal and prismatic forms of the six erystal systems and their relative position to each other. In polished wood case. Duty free.... 13.20 Crystal Models, Set D, 30 models showing the simpler fundamental forms, with colored axes in polished woodicase. Duty fre€ ics... 2s... 6 ssc ae sess cles aie cision eee eee 34.20 Crystal Models, Set E, 10 models showing the simpler hemihedral forms, the holohedral form being made of cardboard and enclosed in the former. In polished wooden case. Duty free.... 16.80 Crystal Models, Set F, 18 models showing the simpler combinations; in polished wooden case. pag oe ne cee nee enc GOrcc ofa ae eee so MOOI OHAMERAD OO ODS etc l5275l5te! 30. Crystal Models, Set G, 16 models showing the complex crystals of holohedral and hemihedral forms. The combination is made of cardboard and is shown inside the glass model which corresponds to the faces of the simpler form of the combination. In polished wooden case. Duty free. 26.70 Crystal Models, Set H, 10 models of twin crystals arranged so that each part may be rotated about the twinning axis. In polished wooden case. Duty free. 2 6.6 ns nee eee eee 20.40 Complete Set of 98 Models, consisting of six collections as above, without boxes and if ordered at one time’: duty freet ss. 525s. ie ee Oe ie id baa as ace renee eee nee A Crystal Models, Cardboard, Vrba. These models are of the large lecture table size, i.e., 16 to 25 em. and are stoutly made of sized cardboard with yellow faces and black binding. Complete arrange- ment of 60 models, duty free 40.5 Crystal Models, Cardboard. Vrba, as above, but a smaller set consisting of 30 representative models, Guty free. - silos woes chasis soc s vee ee eee eels woe mesies Side Bese See ORES ee Re eee 21.00 Note—For large collections of 520 models arranged by Vrba, send for Krantz special catalogue No. 11. Supports for Crystal Models, Vrba, a three-arm support for simultaneously displaying three large glass or cardboard models. When ordered with models, duty free.................-..-....---- 3.60 Supports for Crystal Models, Krantz, a new set of ten holders on individual bases, suitable for demon- strating all ordinary forms; duty freee ade Pa oe ke ao a ee ee eee 13.50 Supports for Crystal Models, a simplified set to support the six principal forms, on adjustable support with base, duty free No. 40688 40672. Petrological Collection of Rock Forming Minerals, Busz, with both micro and lantern slides of each speci- men, consisting of a set of 25 of the most important rock forming minerals each with its mounted thin section for use with the microscope and a lantern slide made from a micro-photograph of same for class room demonstration, with a copy of Part I, ‘‘Kleinen petrographischen Praktikum.” Specimens) srey tex Ober i Oty tlOC o oj.7e» 12550 12.50 12.50 12.50 Bachiior 220 wWwoliseessc- es phe srcyevete : : 13.50 13.50 13.50 13.50 Motor, Electric, for operating on battery circuit, for any voltage up to 8 volts; size 33 x 4% x 43 inches high; weight 31 Ibs.; pulley $ inch diameter........... 2522-2 +--+ sees e eee e eect eee e ers eeee 4.50 angle. For use on either 110 or 220 volt circuits. In ordering please specify voltage and whether CHTTENEMBT ITEC UOT) tl Gert SEMEL ease ores ele ereratates ele ni ee eee a cite an etl ete ie teietartetetcte 7.00 No. 40885 SS SS eee XN an = No. 40908 ee eaunry ae eee) - —= = i ae No. 40924 No, 40916 No. 40920 No. 40928 40888. Mould, Pouring, of cast iron, with three conical cavities 2 inches in diameter, with wooden handle.. 1.00 40892. Mould Pouring, of cast iron, with hemispherical cavities 1{ inches in diameter, with 6 cavities.. 1.00 40896. Muffiles, Battersea, regular form. Dimensions given are outside. Numbers: eee eran ie sees eraerare B Cc D E F Length; inches: f-seeeerat sec coi ones easel 1G 8 83 9 10 Width inches cee eee meee eee case eccce oe 43 44 5 54 6 Helchts inchess-pacn ee aeeee Pmt ceo ae seer 23 3 _ 3 4 ) OEY | is ee eRe Gis cite Ooom cd Gers ROE eis cho ere 45 55 -65 -70 -80 40900. Muffles, Opaque Fused Silica. Ibengths inches! ss. sere- 3 7i 4 9 Se 15 15 Widthiinches::saccrernceenn 23 3 = 5f 65 + 11 Height; inches:<-. s-- eres i 3 33 5 a 63 7 Bach i3.ca55o cee erae 1.85 2.50 2.50 4,25 3.75 7.00 10.00 40904. Muffles, Alundum, D shaped. Length, inches... 4 43 63 it 93 12 123 13 Width, inches... . 33 33 5 4 5} rs 3 6; Height, inches... 2 2% 3 33 3i6 4 ee. 4 Macht. /cosisiaecs 5 1.75 2.25 3.50 3.25 4.50 6.00 6.50 7.00 40908. Needle, Innoculating, a glass rod with 1{ inches of No. 26 platinum wire fused in end........... -50 40912. Needle, Innoculating, same as above but “with 31 inches of No. 24 platinum wire............... 1.00 40916. Kolle, consisting of a holder entirely of aluminum with a non-conducting inset to prevent extreme end from heating, without platinum loop...........-...-.......e0-0-. -80 40920. Needle, Innoculating, Kolle, new form, with demountable hard alice handle, without platinum loop 1.20 40924. Needles, Innoculating, Ravenel, consisting of No. 24 platinum wire securely mounted in an aluminum rod with protecting cover made of a glass tube with one end closed. Furnished either with a straight needle or twisted loop: Style... ........<1cc.c0 ace eerie tes Straight Twisted 1 OE) en eae eee coro Gian O TE SO te NORE TEGO OOOOH ance 80 1.50 40928. Needle, Innoculating, Rosenberger, consisting of a rosewood handle with clamp for conveniently inserting platinUm WATE! sass e.de ite ae alos ors, wis oc av sirsi ere bees Cee arta ee eee eee ee -50 40932. Needle, Innoculating, same as above, but with 1} inches of No. 26 platinum wire................. 75 40936. ‘‘Platinid’’ Wire, as recommended by Neisser for use in innoculating needles because of the present high price of platinum. (Per foot.........:-..>..cosdesseeceaec oe bee heat ee eee 10 APPARATUS FOR THE DETERMINATION OF NITROGEN No. 40960 No. 40968 40960. Kjeldahl Distilling Ante’ complete, consisting of No. 40964 Condenser with block tin tubes and Burner Shelf No. 40968. With burners but without glass flasks or connecting tubes. Number’ ofiburners: -/..,.2:)css secs clrenera oeictoloin ele wo esl srodle lee sieis sie fe sete eee 6 10 LORY | Ron ana aeticn oo Boenacomnanconmitadccca s coon cs borimacnccbnc.conasauenpodacbonc: 2.00 60.00 40964. | Kjeldahl Condenser, only, of copper, with coils of block tin, as shown in Kjeldahl outat No. 40960. Number tof: coils ti v)s.o- foes als econ eae eee ei ants sia toate sake nee etna 6 10 LOE (ARE car non Hon acctardoronca acco rnd dc dncca koscnacctnaaaarunmosbatnsGoce.c 28.00 42.50 40968. Kjeldahl Digesting Shelf with burners, with iron support for the necks of the flasks when used for diges- tions. This is identical with the distilling shelf used in outfit No. 40960. Numberofi burners pass s26 scion se aie eee oeeeen eo aes ee eee eit tae 6 10 40980. 40984. 40988. 40989. 40992. 40996. ZZ» \\\ \(\ A No. 40976 No. 40984 No. 40988 Kjeldahl Digesting Shelf, Electric, same as No. 40968 but with individual electric heaters. Voltage must be stated in ordering. Number of heaters............0......-0seeceees> _ & 10 BSA ne eerste atc rcs csc srakstevereve aia ovate el ete te Save, oal5/0) S/S ala) rayora}e (eat Ve ra enya peetae eaisbermeet stare ate 40.00 64.00 Kjeldahl Distilling Apparatus, improved form, made to hang on the wall. A very convenient apparatus for food chemists in the determination of ammonia and nitrogen. The burners, flasks and receivers are handled from the front and without interference. The burners are adjustable and may be used with natural, illuminating or gasoline gas. Condenser of heavy copper with block tin tubes. Withisixi burners) but without glassware: .-c =.) eee cierto eon ce ae ae 60.00 Kjeldahl Distilling Apparatus, same as above but with support to stand on table. With six burners. 63.00 Kjeldahl Distilling Apparatus, Folin Modification, of heavy tinned copper, with quickly removable, adjustable and interchangeable ring supports of both 4 and 5 inch diameter. The copper still proper is bolted between cast iron end brackets by which the entire apparatus is fastened to the walle Number'Of DUMMErS: 55-2025 shiner «cies « «rola Se cretso Toei ens SCE ee acta 5 6 12 LETC) Cease eh eo ere RAS ane HEH rh ita a A te A ae eta te ee! 35.00 60.00 ExtraiRingsoinehwracht: eos 5 oe cs cu ciace kaa belo apaera sem ace ne Tayo en CEE ne -30 ss LL fr? ly gO ER 10 a ae om ta OP OM ict Amr OOP ok OHNE AHO MACAO II ed Kjeldahl Digesting Rack, Folin Modification, which obviates the use of a shelf as the burners and bulb rack are a self-contained unit. Supports for the necks of the flasks are not regularly in- cluded because it is better to allow the necks to rest dircetly in the lead pipe connected with ventilating tube. Individual supports are furnished extra if desired. Number of burners Shi Ege AR AInIneS clic Hie Cee rE ee RRC CS ion cic co GOA OnE Scio tae coNeoG 15.00 25.00 Individual Rack Supports for necks of flasks, each Kjeldahl Digesting Shelf, Johnson, as used in the Connecticut Agricultural Experiment Station. f heavy cast iron. The flask heaters are 44 inches apart from center to center and the flasks are supported by placing their necks within the openings in the large lead pipe which should be con- nected with the ventilating system. Each burner is furnished with stopcock and the price includes the lead pipe, 4 inches in diameter, on separate stand. Number of burners SONOS COTE EeTEC nn on OD en aeOra coat ObSEEEaHeE Opn 13 LEG) untae Ghditino 6c eae EE eee Cane acc ononndecah ornate aes 34.00 44.00 50.00 Kjeldahl Digesting Shelf only as listed in above outfit; without lead pipe or glassware. INUIMbELIO fs DULNeTS seo ion sss ae hate ee Een: SN sy Eachs-- cere: aitelataictatataltels sielc/taie elu siejaie nisin lcfare seers ofMOr wleaictc aeteteia(erotersteneres 24.00 30.00 33.50 365 41000. 41004. 41008. 41012. 41016. 41020. 41024. 41028. 41032. 41036. 41040. 41044. No. 41012 No. 41016 No. 41024 No. 41004 No. 41008 No. 41036 No. 41040 Kjeldahl Distilling Apparatus, new form, with individual condensers, light and portable and offers the advantage of complete adjustment in all directions so that different size flasks and connecting bulbs may be used. Each burner is furnished with a removable protecting shield and condenser jackets are of brass with condensing tubes of heavy block tin. With out glassware. INumberxoitcondensersa. <7 jorcrccioe cc 5 otis) o cieron ees loinerel eleven efor cverren stereos 4 6 LOE (ie ecg DoteCes TOO ORD See EOC OG C Sat con Nactes sen saneacct 30.00 40.00 Digestion Apparatus, Fumeless, Sy. See Journal of Industrial and Engineering Chemistry, September, 1912. With this apparatus digestions can be made without the use of a fume closet in any place having a water supply and drain. All fumes are disposed of by means of a filter pump and the price includes filter pump, connecting bulb tubes, stand, burners and four 500 ee Jena Kjeldahl bE) 3: Re Boo don a a ee eee Dene ocob bono oooRoeCacc oc OosoCco+- 15.00 Kjeldahl Distilling Apparatus for Single Determinations. Convenient where but little work is to be done: ‘Complete’ as illustrated), including, glassware: ...,s«e/- «sjs\iecieie ainsi lomiee eieieeeeeeaoe 5.00 Kjeldahl Connecting Bulbs, spherical form. with one curved tip at top. Miametersoly bulb: smmee pees sey wae sisoloisis. ole eine cloner en tte been GORE CeCe 52 65 1 DEN) een Drea ANE ante Het aa MCORP AMG GOOMUSUR DON sO Geese moe bebay -50 -60 Kjeldahl Connecting Bulb, Jennings, as used in water analysis. With tubulature in bulb.......... ao Kjeldahl Connecting Bulbs, cylindrical form, with two curved tips inside of the bulb. Diametervofbullbs mim 5592s nse cect solid Aavaselvievereietareceiseannio ee Grae cree eee 45 55 henge thyofibulbsimmmis- =i. mace spencers ixccce a ois ciacslachs eee ALE ee EeoEe 100 120 Ma cheey he. sie chose se bb J Ba ee ec ete ole Se siGieied ois oe ee G SR eee -65 -75 Kjeldahl Connecting Bulbs, Hopkins, with single straight tubulation inside of bulb. Diameteniof bulbs mmnee st Aaya sere a a ean eis aces wise eho lel s See Ree eee 50 65 LET URES naan eee earls d a oon ant Se MERC ee an pisc oc 0 SSS -50 -60 Nitrogen Bulb Fresenius? . 36 3420.62 Sno ois Someone oe onda oo ee donors eee eee -50 SS Se Volthardtss.5 0 2scio5 aie tienes ste a arcietS Sascicie © s)he: apes hs oie oC eee ee -50 se Ze G3 latest: fornis ios hee eden oa isis wl Ok, Ree Ee ee -60 “ sf Will- Varentrapp, with three-bulbs:).% icc /)...st.se.08 bless eek tis sleet Oris ee oe ee Ee 35 sf S fourm MM osonculs scaei san newts oot Glens 72. eee 45 366 > —_—_—<$<$<$ $e" Reset UM aR H. i tHe 107 AMP At ES CS © We I Ay MN S¥¢ Ave fined aii fiani tiv E uintynnt ned A No. 41080 rida op OO dT aeremees aan gerud Se GURcy SOR ee tone a ae acces 18.75 41052. B. Compensating Tube, only...................... 1.75 41076. L. Large Iron Support with six uprights fitted with rings. 41056. C. Large Measuring Tube, only .. 4.00 Rack and pinion movement for levelling bulb, ete. 41060. D. Nitrogen Bulb Tube, only 5.00 Made tocorder only )a0 eso ase = seceneseace 50.00 41064. E. Levelling Reservoir, only. 75 Note—For suitable tubing for use with above see our No. 41068. J. Reaction Bulb, only ...... .. 6.00 46225. 41072. Keg Three-way Lube; only) sis. Aisccas sac eeeces -50 41080. | Nitrometer, Lunge, with rubber tubing, but without support. Capacity.. 50cc in yoths. 100 ce in 3ths. LDENY Womate actos o pedoin stro CoE OGOC ee EE Dae eae aaOb en aooeES 4.00 4.50 41084. Nitrometer, Lunge, as used in the determination of nitrogen in gun powder, nitro-glycerine, dynamite ete. Graduated from 100 to 140 ce in yoths. With rubber connection but without support. 6.00 41088. Nitrometer, Lunge, same as No. 41084 but complete with support and clamps.................. 10.00 41092. §§ Schiff, graduated to 100 ce in ths, on support, with reservoir, special clamp and rubber TE ONUaF ERAS at bay a Re el te ln ence ERR AEA eet ae aI EOE es oS OO COD oe ROS tae Oe Oe eine 7.00 41096. Apparatus for the Gasometric Determination of Aliphatic Amino Groups, Van Slyke. See Journal of Biological Chemistry XT, p. 275, 1911, and XVI, p.121, 1918, also Abderhalden’s Handbuch der biochemischen Arbeitsmethoden, V, p. 995, and VI, p. 278. The nitrogen gas evolved from amino groups and nitrous acid in the reaction RNH:;+HNO:=ROH+H,0 +N: is purified and accurately measured in a gas burette. A complete determination of the NH» nitrogen of amino acids requires but six to ten minutes, and the accuracy is equal to that of a Kjeldahl determination. An indefinite number of successive determinations can be performed with- out disconnecting any of the parts. The apparatus permits analysis of any volume of solution up to 10 ce and give results with an accuracy of +,th mg. of nitrogen. This method has been applied to varied problems, among which are study of protein digestion, both in vitro and in vivo; the determination of the nature of the amino acids yielded by hydrolysis of small amounts of protein, determination of free amino groups in fixing the constitution of various or- ganic substances; and the determination of amino acid nitrogen in urine, blood and tissues. Complete with glass parts and supports, pulley, shaking device, etc., but with- OUt MOLOE.s-eiisiefocere tC Renee erisioeivieciacineien 2OL00 Extra glass parts 41100. Reaction Vessel with filling funnel, burette and three glass stop- COCKS? oe ocean cane OEE ene eae 8.75 41104. Gas Burette, Schellbach, with three-way cock, levelling bulb and tubingydicedaettes come en eins een se cee ca 4.50 41108. Gas Pipette, new form, for shaking ..................+.-..- 1.50 Note—We recommend our Motor No. 40884 suitable for connection to house circuit instead of that shown in the illustration which is intended to work on accumulators. No. 41096 367 41200. 41204. 41208. 41212. 41216. Aba AsnESE Sasa em No. 41200 No. 41204 No. 41208 No. 41212 No. 41216 OIL TESTING APPARATUS Fire Tester, Elliott, for the flashing point of illuminating oil, only. With thermometer........ 11.70 Fire Tester Foster, for the flashing‘point of illuminating oil only. With thermometer........ 13.50 Fire Tester, open form, for the flash point of illuminating oil, with thermometer.................. 5.85 Fire Tester, Cleveland open form, small size, complete with thermometer................---.++-+ 9.00 “large model, a most substantial tester. Complete with ther- mometer 80° to 640° F., aleohol lamp and Bunsen burner............---+++-2eeeeeeeeees> 13.50 41220. Flash Point Tester, Abel-Pensky, for petroleum, latest model, with clockwork for opening cover and for depressing the test flame, with certificate of the Kaiserlichen Normal- Eichungs-Kommission: with one standard thermometer 10-55° C. and one 50-75° C. and aneroid barometer 65.00 41224. | Standard Thermometer only for above, 10-55° C., with metal fitting and P: ‘T.-R.certificate - -. 2. ---- eres 4.50 41228. Standard Thermometer only for above, 50-75° C., with metal fitting and P. T. R. certificate: -------sssee 4.50 41232. Flash Point Tester, Abel-Pensky, for both high and low temperatures. This outfit is identical with No. 41220 except that the joints of the heating bath are hard brazed and it is supplied with an additional pair of thermometers for high temperatures, i. e. one from 50-160° C. for the oil bath and one from 70-200° C. for the water bath, and is arranged for both gas heating and gas ignition, with certificate of the Kaiserlichen Normal-Eichungs-Kom- MISSION <=... sco ss sees ieee he eee 80.00 41236. Thermometer, only, for above, 50-160° C................ 4.00 41240. ss ‘s « © *10-200° C.2. 3. eee 4.00 41244. Flash Point Tester, Abel-Pensky, for benzene, benzole, etc., with oil cup, similar in arrangement to No. 41220 and with two thermometers — 30 to + 40°C.......... 40.00 =2 41248. Thermometer only for above — 30 to + 40°C............ 3.50 No. 41220 No. 41252 No. 41268 No. 41272 41252. Flash Point Tester, Pensky-Martens, for heavy oils, latest model, for gas heating, with thermometer Haun, SOSP0AT C sh aes 2 adbbdn doled cod ocean ll peeC pen emerraan Gre nrccte crn. Ne devs cae aA 000 41256. Thermometer, only, for Aone, COPE Ces vpudal te AUS 1k. entinitermdey candace ncn scceon saeco cnee 6.50 41260. ss 40-160°C., “ sf s for low tempe TAUTES eer 5.00 41264. fi ss o cc 200-400° C., “ 6 ss “high SMMC carat 8.00 41268. Flash Point Tester, Pensky-Martens, for heavy oils, exactly the same as No. 41252 but with electric heating and ignition; for either 110 or 220 volt circuit. Voltage must be specified in ordering. With adjustable resistance, connecting cord, socket and switch and one certified thermometer 80-250°C. With this electric heating device the crucible may be heated to 100°C. in seven min- utestandsto400°Caintwenty=tye MInuUteEs= ns. cciemcice oes ace teeimee coerce samea eae 110.00 41272. Flash Point Tester, open crucible form, for gas heating and gas ignition; with one thermometer from 80 to 280° C., porcelain crucible and adjustable burner... sangwece Ped) No. 41276 No. 41280 41276. Flash Point Tester, U. S. Bureau of Mines Model, for low burning oils, complete with three thermom- eters, aneroid barometer, instructions and portable carrying case ...................605 135.00 41280. Flash Point Tester, U. S. Bureau of Mines Model, for high burning oil, with two thermometers and Insinictions. inyportable (cases -/.\.)..2-/-1-l\= 1-1 ejelelsisielenele seine atejele isis Bena lec eerenaae 120500 369 No. 41300 No 41324 LeU No. 41328 a —— ARTE yooer <2 =— No. 41284 No. 41312 No. 41316 41284. Flash Point Tester, same as No. 41280 but with electric heating, for either 110 or 220 volts. Voltage must be specified in ordering; with adjustable resistance, switch, socket and cord......... 65.00 41288. Thermometer only for either No. 41280 or Ni: 41284. ‘80=2807@sosnn0. c cee ee eee 4.50 41292. MY x oat © 180-400 NG ses ep ccsltce fe oe ee ee rete eee 5.00 41296. Porcelain/Grucible only forjeitheriof above... .........- ss... cee e oe ee een ee ae eee eee 45 41300. | Viscosimeter, Scott. Each instrument is standardized and has stamped upon the handle the time in seconds and fractions of seconds required for 50 ee of distilled water at 70° F. to be discharged. Complete with thermometer to 212° F. in single degrees and 50 ce graduated cylinder...... 15.00 41304. ‘Thermometer forabove, 2122 Beimisingle degrees. «0... (ec « ee cies ever ole) oie eceie le 4 ners eee eee 1.50 41308. Thermometer for lubricating oils, 50° to 120° F. in 3th degrees................. 2.022 eeeeee ser eeeees 5.00 41312. Viscosity Pipette, Dudley, ‘deliv ering 100 ce of “distilled water in 35 seconds at a temperate of TODS sero Rie tese is a wrcterd owe aralle eyaussave Shang ins aig Soak ace iS, a 3 olor a ale aralrateteleatts re yenetener ch tele eater 25 41316. Viscosimeter, Redwood, original English make, for testing the viscosity of oils and as adopted by the British Mineral Oil Association. With certificate of verification by Mr. J. A. Hicks, assist- ant to Sir Boverton Redwood. Complete with thermometers................0+.+eeeeeees 45.00 41320. ‘Thermometers for No. 41316; (340 to 800° RS Per pain... 2). 5s cse. ences nee een eee 6.00 41324. Leptometer, for the direct comparison of the viscosity of two oils simultaneously and under equal (Xe (obit (0) 0} ioe a ee eee Ci ee eRe SEMEN tctcb boot asccosoat es 40.00 41328. Viscosimeter, Stormer, new model. This instrument is constructed upon the principle of rotating a cylinder in the liquid under examination with a constant weight and at a known temperature. A revolution counter is connected and the time required for the cylinder to make a specified number of revolutions in distilled water and the substance under ex: amination form the basis of comparison, or in other words, give a means for determining the viscosity of a liquid, with direc- MOEA poooeosocoeee Sy sig Sect syaye tors seveve eetonsy tus ekeyeh stele) Ga. Sisceeysys cidielese/e ele ce Lorelei Oe eee 30.00 370 Ai eR hy *H, “UR H. ib He [OF Mp AY Ss) CeO Ms gee eA aN ~< No. 41356 No. 41332 No. 41340 No. 41352 41332. Viscosimeter, Doolittle Torsion, improved, for measuring the viscosity or fluidity of oils, varnish, starch, glucose, glue, or any fluid whether containing solid particles in suspension or not. See : Journal of the American Chemical Society, Vol. XV, 1893, pp. 172 and 145. Complete........ 75.00 41336. | Viscosimeter, Saybolt Universal, original make and design............++-....++.-. Moise OU LOU, 41340. Viscosimeter, Saybolt Universal, Improved Model, for testing cylinder, valve and similar oils with bath at 212° F and the oil at 210° F, for reduced black oils with oil at 130° F and for testing neutral, spindle, paraffine, red and other distilled oils with oil at. 100° F or with oil at any temperature from 70° F to 212° F. The Viscosimeter is now furnished with an electric heating element for either 110 or 220 volt lighting cireuit with cord and plug for lamp socket (voltage must be specified in ordering) and is also furnished with the usual gas heating arrange- ment as shown in illustration and also with a U-tube steam heater ...................... 75.00 41344, Extra Flask, graduated, 60 cc capacity............ BPH Gaede Aap poOU IO Ree RE MLAS a cement 1.25 41348. Extragunermometerss: cach eens. coe cee ec ete een err BE eo PAN 1.75 41356. Viscosimeter, Engler, for High Temperatures, similar to No. 41352 but with hand brazed bath and enclosed steam jacket; with two certified thermometers, 180-300° C and 200 ce certified flask with one mark, tripod and ring burner; with certificate of the Kaiserlichen Normal- Bi chun gs KOomMMiss OMe ee elt elellekelstel eter eter 55.00 41360. Viscosimeter,Engler, Improved Model, according to the specifi- is, cations of the Petroleum Congress. This instrument differs Oi) ae from No. 41352 in that the oil bath is totally immersed in the water bath and the lid of the oil bath is doubled walled. The water bathis also provided with astirrerD. The water bath is wider, permitting amore constant temperature and the special device F is provided to control the opening of the outlet tubulation; with two certified thermometers, 10-50° C and 10-150° C, 200 ce certified flask with two marks, tripod and ring burner; with certificate of the Kaiserlichen Normal-Eichungs Kommission.......... 46.50 100cem ) WwOcem ) No. 41360 371 > R ~< deh WIR Fil hey tO} Mia Ay CIO Sa Me eae 41364. 41368. 41372. 41376. Ont COLL eS OOOO et Ee ea aroreemon on aeo.cobOn Ode or ceo apcoskédcosceeg ccs Viscosimeter, Engler, Improved Model, for Small Quantities. 20 ce of oil is required for the test instead of 200 cc. By this arrangement much time is saved in the testing of thick oils by dimin- ishing the time of outflow. Otherwise the instrument is similar to No. 41360. With 2 certified flasks, one of 200 ce with two marks and one of 20 ce with one mark; with support, tripod, gas burner and 2 certified thermometers, 10-50° C and 10-150° C. With certificate of the Kaiserlichen z Normal-Eichungs Kommission........ 2-22... 20-0 eees ener eons oisieie sess see els 70.00 Viscosimeter, Engler, for Electric Heating. Otherwise as above, with adjustable resistance, and cer- tifieate of the Kaiserlichen Normal-Eichungs Kommission. Voltage must be specified in order- CL) Ree eae ih et ty Se ee een SM be One oraintccoosbenscaadcacoccessi ce 109.50 41380. | Viscosimeter, Ubbelohde, for Illuminating Oils, for the testing of which the regular Engler Viscosimeter is not well adapted. The oil cup is wider and the same is provided with an over- flow tube for bringing the oil to the correct height and the out- let tube is of greater length and of smaller diameter than for lubricating oils; with two certified thermometers 50° and 100° C, 100 ce certified flask with one mark, gas burner and $TUPO” | :..2 2.56 Dow de,o bee pe eee eee Oe Eee eee 34.50 41384. Viscosimeter, Ubbelohde, for Illuminating Oils, for Electric Heating. Otherwise as above. With adjustable resistance. Voltage must be specified in ordering..:0-..---+-<- 79" eeeeets 74.25 41388. Viscosimeter, Ubbelohde, for Cylinder Oils. This is similar in con- struction to the Petroleum Viscosimeter No. 41380 but the joints are hard brazed for high temperatures and the water jacket is enclosed in asbestos and furnished with cover and stirring device. With two certified thermometers, 100-300° C and 180-300° C, measuring flask 100 ce with one mark, tripod and: rine burner... ...0- 5c Sees s ee ate oe eee 47.50 41392. Viscosimeter, Ubbelohde, for Cylinder Oils, for Electric Heating- Otherwise as above. With adjustable resistance. Voltage must be specified in ordering............+.2+++-+s0-+eee 86.75 No. 41388 372 No. 41404 PRECISION 200 CC PRECISION A+ 20°C Reese No. 41400 No. 41448 No. 41456 No. 41464 41396. Tables, Ubbelohde, for use with Engler’s lubricating oil Viscosimeters. The use of these tables 41400. 41404. 41408. 41412. 41416. 41420. 41424. 41428. 41432. 41436. 41440. 41444. 41448. 41452. 41456. 41460. 41464. 41468. dispenses with all calculations and gives direct readings in Engler degrees for the outflow periods of both 50 cc and 100 cc. They reduce the time of making tests to about 3th that required with- out the use of the tables. See ‘‘Handbuch der Chemie und Technologie der Oele und Fette.’’ TREYOI NS o 065 Rob EEA IO CIRO ID Ee Bs PAE eee bo Sis At ome aernc meme 5 VoD CoO nao ODORS 1.50 Apparatus for the Distillation of Mineral Oils, Engler, consisting of a nickel plated receptacle for the mineral oil, on stand with burner and cover; with condenser with support, measuring flasks, and two burettes with stand; all packed in two portable wooden cases. With P. T. R. certificate for both the apparatus and the glassware. Duty Paid.......................-...--+--+--+ee 107.00 Oil Testing Machine, Thurston. The journal of this tester is 1,5; inches in diameter by 13 inches long. The friction is measured on a graduated circular are by motion of pendulum over same...... 160.00 Oil Testing Machine, Thurston, as above, with countershaft...............-.2..2.22 22 eee eee eee 190.00 Molecular Weight Determination Apparatus, Schimmel, as used for determining the solidification point of essential oils. Complete with special thermometer from —20 to +40°C. in 3°... 6.50 Thermometer, only, for above apparatus, —20 to +40° C. in $°................... 022 e eee eee eee 2.50 Thermometer, for Engler and Ubbelohde Viscosimeters, 10-50° C. with P. T. R. certificate..... 3.00 t e " by s is 10-1505 Ca eS .... 4.00 “ “ “ “ce “ “ 10 200° (Ge “ce “ “ Bits 5.00 “ “ “ce “ “ a 180-300° (Gy “ ce “ pea 7.00 i Somasss ff 5 F 10-300°C. “ oY e Jae) 800 “ “ ce is “ “ 109-300° (OE “ “ee “ ne ts 7.50 “ “ “ “ “ a7 100-3502 (Cr “ce “ “ce 8.00 Flask, Engler, 200 cc, with one mark, usual form, as shown in illustrations of No. 41332 and No. 41356; Without certificate. .<..c0 a... BRE ee ne Ph coe Bacon OCC ne CE OOO eR 740) Blaskjenglersasiabovewiihbe-wk vk certincate..nae ee emis sae reciente tetera Bi) «Engler, 200 ce, with two bulbs and two marks, as shown in illustration of No. 41360, ete.; with- (EUitF (lesan ti Sue eae ee Oaric Cee eee oie ooch oc comuodorn aude doudanatoebeatcmoge DUD) Blask, Pngler. asabover with bai by. Certiticatesmwac errs tere e eon ceieivetis seeiiccir cecacnimce 4.75 “ fe 20 ee with one mark, as used with No. 41372, without certificate................ 2.00 sé ne oa Gs us SS a sf “ 7 bar | L (Ss ve) ae | a5 [e) = > wn i) fe) = 0 > C4 < i My] i iN No. 41744 41744. Oven, Drying, Alsop. Designed for and widely used in tanning laboratories. Will accommodate 110 No. 26012 crystallizing dishes. of heavy copper with condenser at side to supply distilled water. With steam outlet at top. Size 35x 25inches. For gas heating............... ica eee 135.00 41748. Oven, Drying, Alsop, same as above but with coil for steam heating........................... 140.00 41752. Oven, for Vacuum, Sidersky, improved model, consisting of a double walled chamber with heavy metal door with plane glass inset. Inside dimensions 260 x 300 mm. Duty Free. . Pasaoo Wedh) Duty Paid Roe hs occa owe: 80.00 No. 41756 No. 41760 41756. Oven, Soxhlet, of polished copper, improved model with eight tubes, ball condenser, draft chim- ney and tray with five nickel dishes. Drying chamber is 50 x 100 x 34 em. The tubes supply- ing heat to the chamber lie in a bath w hich is filled with a high boiling point material such as salt solution, elycerine, toluol, etc., according to the temperature desired. As used in the rapid determin: ution of total solids in milk and other experiments. Dutysbree: Aiecscthcnet eee see 36.30 Duty Paid)... accor eee 45.00 41760. Oven, Vacuum, of heat avy cast brass. With glass door, and interior lined with zine. Inside dimensions 25 x 25 x 25 cm. DTN CeCe re a décosebabocooaoudenG 90.75 Duty Paid). .onc522.- + eee 110.00 380 aS eee ASR --H- UR Jele dy (Hip Om 3M Ay —-S CeO} 2M (RA eAy aN < No. 41761 No. 41772 41764. Oven, Double Wall, for Vacuum, for gas heating, cylindrical form. Space between the walls may be filled with glycerine, toluol, etc., when high temperatures are required. Of heavy copper, tinned on inside. Inside dimensions 95 x 405mm. With vacuum gauge and ball condenser but without burner. DutyBree! (shs-26 oot eee 40.00 Stocks; s0--c220t sercnatotemeahs> aa6 45.00 41768. Oven, Double Wall, for Vacuum, as above, but for indirect steam heating with valves and connections. Duty Pree: Gas6 oo cisectiesiseatee Tews 45.06 Duty, Pade. sesso ashes sciences 60.00 41772. Oven, Double Wall, for Vacuum, cylindrical form, with heavy plate glass at each end and door fastened by clamps. With thermometer in metal mounting, manometer, reflux condenser and two remov- able shelves. For gas heating. Size 180x410 mm. Duty-Rrees soccer nace nee 66.00 Duty Paid has occ se cis cossiciioc == 88.00 41776. Oven, Double Wall, for Vacuum, of the same general construction as No. 41772 but extra large size, i. e., 600 x 300 mm inside dimensions. Massive construction with heavy plate glass at each end. May be fitted for direct steam heating without extra cost. With gauge and reflux condenser. Mntyshree 2 eee eae 125.25 DutyaPaid ass areas sectoral 155.00 41780. Oven, Vacuum, Hearson Electric. This apparatus consists of an inner cylindrical chamber, the ex- posed end of which is furnished with a loose cover which can be clamped to this end of it in order to hermetically close it when it is de- sired to exhaust the air. The inner cylinder is surround- ed by another cylinder of larger capacity, which is filled with par- affine (not oil). In the space be- tween the two vessels there is also, coiled around the inner cylinder, a long fine copper tube one end of which terminates in the inner cylinder, whilst the other end is furnished with a small valve which will be found on the left-hand side below the apparatus. Another small tube connected with and terminating in the inner cylinder will be found on the right-hand side also below the apparatus. The regulator and the ther- mometer both dip into the vessel of molten paraffine in which the inner vessel and copper tube are both also submerged. It will be found in practice that the inside No. 41780 temperature indicated by self-reg- istering thermometers, is about 3 degrees above that shown on the scale of the thermometer outside when the inside is at 248 degrees Fah., allowance can be made accordingly if considered necessary. The asbestos gaskets which serve to lute the cover should be painted frequently with black- lead mixed with turpentine. Air admitted to the inner cylinder through the small valve on the left is compelled to traverse the long length of copper tube before reaching the cylinder into which it is admitted at the back at practically the same temperature as that already in the interior. When ithe desired temperature is reached the electrical energy required to maintain it is only 50 Watts. DatyEreericecsaiins cnc cee ce 113.40 Duty Raids ocnoc ceo eae 170.10 No. 42012 = Gavmeny ¢ FerGlassChina, Metal.x 221A. H.THOMAS CO. _ No. 42016 No. 42024 No. 42028 No. 42032 No. 42036 42000. Paper, highly glazed on one side. Convenient for collecting filter ash, etc. In white, black, blue and yellow. Color must be specified in ordering. Sheets 20 x 24 inches. Per quire........... 25 42004. Paper, Parchment, for dialysers, ete., medium weight, in sheets 375 x 250 mm. Per sheet....... 10 42008. of extra heavy, particularly selected for and used by the leading Antitoxin Labora- tories for filtering antitoxin, serum, etc. Recommended as being the only thoroughly satisfac- tory paper for this purpose. In sheets 66 x 100 cm. Per sheet..........0....ccecceeeeeees -30 42012. Pencil Litmus, Tyree, consisting of a red and a blue litmus pencil in metal case................-. 25 42016. Pencils, Wax, best imported quality, for writing on glass, china, metal, etc. Selected espenially for laboratory use and found highly satisfactory for this purpose. In white, blue, red and yellow. Color must be specified in ordering. Bach, f4.< 2.026 ask rate anbeestiea se eee eee -10 42020. Pencils, Wax, with the wax enclosed in “hard rolled paper instead of wood. In white, blue, red or yellow. Please specify colorin ordering. Each... ....2.. 5.2.2... .0- + esse ee macee eee 12 42024. Percolators, conical shape of blown glass. @apacity:........ spt. _—_—i pt. 2pt. dgal. I1gal. 2gal. 3 gall 5 gal. Machin. ace se -40 45 -50 -70 1.00 2.00 3.25 6.0¢ 42028. Percolators, cylindrical or Oldberg’s shape, of blown glass. Wapacibysiwsncss serscaeteeee zpt. Ipt. 2 pt. ; gal. 1 gal. 2gal. 3 gal. DING Rosacea apbee gener sacnond 40 45 .60 1.00 1.50 3.25 4.00 42032. Percolators, with tubulation to fit } inch rubber tubing. Wan AacibYjni.c cers sis come ae oes meee ioe ee. te oberon zpt. %Ipt. gal. 1 gal. 2 gal. Bachar sere skies et guna cackpnsaegacdanade hac -50 -60 80 1.10 2.25 42036. Percolator Bottle, graduated in ce. Capacity, ce....... 500 1000 _ 2000 4000 8000 LOCO Vas doce atic ts es Pee Cerner e Pree ine een ete cin. 1.00 1.10 1.65 2.85 4.35 No. 42040—See description on following page 382 42040. 42044. 42048. 42052. 42056. 42060. 42064. 42068. 42072. 42076. 42080. 42084. 42088. 42092. 42096. 42100. 42104. 42108. 42112. 42116. 42120. No. 42064 PHOTOMETERS Photometer, Weber Portable, Opal Glass Plate Type, with Lummer-Brodhun prism, for comparison by similarity; with benzene lamp and Prof. Web- Duty Free er’s table of constants. Complete in portable case....................- 120.00 Photometer, as above, but for comparison by both similarity and contrast... 127.50 Accessories for Weber Photometer Nos. 42040 and 42044. Standard Incandescent Lamp for 2 volts for use with above, inter- changeable with benzene lamp, in mounting..................... 21.00 Reflecting Mirror Attachment, to be put onin place of tube “K’’........ 9.00 Table of Constants for the mirror attachment......................... 3.00 Adjustable Laboratory Tripod, for either of above Photometers........ 3 Photometer, Weber, Improved Tube Form, latest construction with Lummer-Brod- hun prism, for comparison by both similarity and contrast, with adjustable opal glass plate in the tube, diaphragm arrangement, but without percentage graduation, standard lamp, plate box or receiving screen. See Zeitschrift fur Instrumententunde XX VII Jahrgang, Juni 1907. (Copy of reprint sent CIMT oo pope se sonedCCoon aan c==ce po unaasenoer base. duneeoauoeneconosr 159.00 Accessories for No. 42064 Weber Photometer. Rercentace Graguation) ONvab Ovens cece ei see rear lene nieroreioeiers 4.50 Standard 2 Volt Lamp, in adjustable mounting as shown in No. 42064........ 21.00 eo) = ae (2 vo) iat =| HiT SOR Mie AS CO} Meas Rar Ag Nae No. 42560A Hl) No. 42560B No. 42532 No. 42560C 42532. Slide Wire Bridge, Kohlrausch, Leeds & Northrup, with extension coils specially designed for use in the measurement of electrolytic resistances. The slide wire resistance is about 25 ohms and end coils are provided to increase the effective length of the slide wire. These coils are exactly 43 times the resistance of the slide wire so that the slide wire is jjth of the total resistance. The position of the contact is read by means,of the vertical glass scale which reads complete turns and also by the scale on the periphery of the hood, which latter is divided into 100 parts, each division being about 6 mm. These divisions are further subdivided into halves so that it is possible to estimate to ysj9th of a complete revolution or to ys}5oth of the total motion of the contact point. Used and recommended by many leading Physical Chemists............. 68.00 42536. Standard Resistance Box, Leeds & Northrup, with coils .5, 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300, 400, 1000 ohms. An infinity plug-is also provided. The coils are arranged on the plug out plan and are guaranteed. to be accurate to within *.%. The coils are bifilar wound and are practically free from capacity and inductance, and are particularly recommended for use in the measure- ment of electrolytic resistances. The wire used is of manganin which has a very low temperature coefficient. The accuracy of the coils is, therefore, practically unaffected by ordinary changes in temperature. The blocks and plugs are large, insuring good plug contacts............ 85.00 42540. Standard Resistance Box, Leeds & Northrup, similar to No. 42536 but containing the following coils; .5, 1, 2, 3, 4, 10, 20, 30, 40, 100, 200, 300, 400, 1000, 2000, 3000, 4000, 10000 ohms, and an infinity POINT se Navara sehote siciajoscte si svevevele.s'aisleve's «)ctuyolelevelareysreteietevefsrainielsters mnie ere eeeteieciel se) keene 100.00 42544. Induction Coil for Electrolytic Measurements, Leeds & Northrup, with extreme rigidity of the vibrator so that it will operate in spite of mechanical vibrations and short circuiting of the secondary coil. The vibrator is provided with a slow motion set screw so that fine adjustments are possible. Operates on a single cell of storage battery and is enclosed in a felt lined case, and consequently makes) Very little Moise.....2sa00 ssavaeisislee 40 vwlelns cle downs stosea cies Selene ee eee Eee 20.00 42548. | Head Band Telephone Receiver, Leeds & Northrup, specially made for laboratory work, unusually sensi- tive and with strong permanent magnets. The receiver is thoroughly insulated from the head bands which are strong and light in weight. With 6 ft. of flexible cord.................. 5.00 42552. Resistance Box, Otto Wolff, in decades with plug connection. Decades 10 x 1000 with a total resistance of 100,000 ohms. Of manganin Ps S|) = wire. MO - hey) iL ~. DutyBrees 6 ele siecle eee eee 49.50 mine j Duty Paid ....¢ 22: +04 505500 66.00 42556. Platinizing Solution, according to Kohlrausch and Holborn, consisting of a 3% solution of platinic chloride and ;;th of 1% solution of lead acetate. In 50 ce bottles, per bottle se. soccer ere eee eerie 2.50 42560. Binding Posts, Ostwald. Sheet or wire can be held equally tight. Styletyas.ceceeaceeee A B Cc Hachy..c 20-2 eee 35 35.35 — i ii 394 42564. No. 42564 Apparatus for the Determination of Electro-motive Force by the Potentiometer Method, arranged ac- cording to Ostwald and as used in the Leipzig laboratories. See Phy.-chem. Mess., 3, Auflage, Seite 426. Outfit consists of the following :— Capillary Electrometer with microscope of 30 and 60 diameters and ocular micrometer divided into 5 mm, with movable mirror and horizontal fine adjustment on the microscope. Electrometer Key, with platinum contact, on wooden base. See Phys.-chem. Mess. 398. Cadmium Normal Element, mounted on board, with binding posts. Slide Wire Bridge, with scale 1 meter long divided into millimeters, model of the Phys.-Chemischen Institute, Leipzig. Accumulator. Contact Key for one circuit, with three posts, on polished wooden base. ae of Half Elements No. 42623 with Cylinder No. 42632, Stand and Clamp No. 42636 and with two each of No. 42640 ‘ectrodes. Mercury Commutator with six binding posts. Duty Free No. 42596 No. 42580 No. 42568 No. 42592 No. 42588 No. 42600 42568. Capillary Electrometer, with microscope of 30 and 60 diameters and ocular micrometer divided into #5 mm, with movable mirror and horizontal fine adjustment on the microscope. Illustration Finer) Mrlec: INO. CREY(F Thal pathy aga noua oud cooGogon docosoUod Sooo bosnndconeeeaonodauorc 25.00 42572. Capillary Electrometer Tube, Ostwald, vertical form..................... 0. eects 30 42576. me ce “Luther, with contacts and already filled......................-+.-- 3.00 42580. “Mercury Commutator, with six binding posts.........0.5. v0) = L ( v9) H. i eohiGe (OF Ma Awes C40) (Me-jR ee Ape Nee ays PHYSIOLOGICAL AND CLINICAL APPARATUS 42800. Kymograph, Hiirthle, mounted on heavy oak table, with two cylinders of 20 cm diameter and 25 cm high adjustable as to distance apart so that papers of from 60 to 330 em in lengthean be used. With new reducing gear so that speeds can be obtained from 0.2 to 120 cm per second. As supplied by us to Rockefeller Insti- tute for Medical Re- search, Harvard Univer- sity, University of Wis- consin University of Pennsylvania, University of California, Drs. Mayo, Graham, Plummer & Judd, U. S. Publie Health & Marine Hos- pital Service, ete. 42804. Apparatus for smoking paper with gas flame, after Hiirthle. Duty; Freess-5 sees 25.50 Duty;Raids--eeeee 30.60 42808. Special glazed paper, 50 cm wide, in rolls of 10 meters. Per roll, from stock. .).c.Sneeeeeee 1.00 & 42812. Kymograph, Brodie, mount- ed on strong table with top 51x24 inches. The recording drum is 9 inchesin diameter and 10 inches high and will take papers of varying length from 6 ft. 3 in. to 9 ft. 6 in. A fine adjustment is provided on the small drum for tightening the paper. ‘lhe time marker and signal are conveniently placed under the drum so as not to interfere with the manometer. Price includes separate pair of drums for smoking and varnishing, mounted on wall brackets. A recent improvement is a two speed gear so that the speed may, at any moment, be increased from 13 to 24 times. Duty Free..... 330.00 Duty Paid..... 400.00 42816. Special glazed paper, 10 inches wide, in rolls of 200 yards, Per TOllOS A tonaoces 4.00 || | No. 42812 398 ; \' No. 42848 No. 42860 KYMOGRAPH, ZUNTZ, for practical class work in the laboratory. The drum is 18 cm high and is immediately 42820. 42864. 42868. 42872. detachable for the purpose of attaching the paper which may be readily smoked on the drum with the apparatus in the horizontal position. With variable speeds as noted in the descriptions below. Kymograph, as above, with clock-work, for use either vertically or horizontally, surface speed of eylin- der varying from 5 to 40 mm per second. By the use of the fan governor No. 42840 the speed may be reduced to one revolution per hour equal to a surface speed of 500 mm per hour. uty AN ee Wy eercaetomicve se sickeet veers 30.00 Duty Paidinccc ce reriioeioricieie-lelere 36.00 Kymograph, as above, but with Fiihner’s slow motion modification consisting of a supplementary lever by the use of which the speed may be reduced to one rotation in 24 hours. In addition to this slow motion the instrument will give all the speeds attainable with No. 42820. MutysPree ers eee wcia seis 43.50 Duty Raids ste eoosc nee sewers 52.25 Kymograph, same as No. 42820 but with a special quick motion providing a surface Daty Free Duty Paid speed of 200 mm per second, in addition to the regular speeds of No. 42820..... 40.50 48.60 Kymograph, same as 42820, but without clock-work, with pulley wheel for driving by ‘ PAGE PEM GE MIMI OLOM rarer ye sieve levavevs cietereiere svetale hel cistaxerate ote aucraestarereres Siedotetshererehs 21.00 25.20 Support, Adjustable, for kymographs listed above (see St of No. 42844). This sup- port provides a convenient means of attaching the writing levers, etc......... 4.50 5.40 Fan Governors, for above kymographs in three sizes, each..............2..00--05 -90 1.10 Attachment for Supporting a Continuous Ink Record. Price does not include adjust- able support No. 42836 which must be added....................000ceee-ee- 7.50 9.00 Support, Extension, for use with endless papers by the Hering method.............. 18.00 21.60 CarryineaG@ases with) handleland lock-}es. qs ee atinn eee echieeeee 7.50 9.00 Glazed Paper, 510 x 180 mm, gummed. Per 100 sheets.................... 1.15 1.35 Recording Drum, Sherrington-Starling, with drum 6 x6 inches adjustable up and down the shaft. Two electric contact springs are provided by which contact at any two points in the revolution can be made. There are two driving gears within the base, a worm and wheel for the slow motion and a volute gear tor the fast, with friction-clutch for stopping and starting. A change speed gear permits a range of speeds from 1 to 870 revolutions in a given time depending on the speed of the driving motor. Without driving motor. DutydBrees 2.4.28 s neic sie 35.25 Duty: Paidt.0< cs. dae 42.30 Duty Free Duty Paid Recording Drum, as above, with screw lifting device.......................2.05- 38.25 45.90 Extra.Cylinder: 12)inchesiin diameter.ca. erste natecislo a otctecisiorsscveieie iorsiecensy sis 18.00 21.60 Glazed) Paper; per rollof 200syards.. co. ~ sasee stereo aero oes onesie cece oe 2.25 2.70 42876. 42880. 42884. 42888. 42892. 42896. 42900. 42904. 42908. 42912. 42916. 42920. nail No. 42884 No. 42892 No. 42904 No. 42900 Chronometer, Graphic, Jaquet, the most accurate and widely used time marker, reading in seconds and 4th seconds. For use in either vertical or horizontal position. See Jaquet * ‘Studien tiber graph- ische Zeitregistrierung. Zeitschrift fur Peas, Bd. XXVIII, S. 3 1891. Duty Breese hae ewan 33.7 Stockso2.5 0. saien set noe eee 43.85 Chronometer, Graphic, Jaquet, New Model, eH arrangement for writing inter- Duty Free Duty Paid vals of 3 and 6 seconds in addition to the 4th and single seconds, the addi- tional adjustment being controlled by leve er operating on small arc.--..-. 42.50 55.25 Metronome, Jaquet, with mercury contact, giving contact intervals, by adjust- ment of weight on the lever arm, from +4 to qi second. A further interval of 3 seconds is possible by arrangement of the contact. Operates 30 hours at ONS™ WIN CINE see oh wake sees cise aie Wisiclatonisle eu cioreae A(aie oct ars eee 18.75 24.40 Tuning Fork, electro- -magnetic, adjusted to 100 double vibrations per second. . 15.00 18.00 ss with direct writing point, adjusted to 100 double vibrations» per:secondevsameene sos oo tes = ae bekrainays Saaisicrooreesieeeien looser oee 16.50 19.80 Manometer, Spring, Hiirthle, for registering arterial blood pressure in animals. See Piligers Archive Bay Sormenacce ees recess el aoe eee eee 21.00 25.20 Manometer, Mercury, Hiirthle, for control of spring manometers, etc. See Pfrigers Archway Bas sso galeria sceeisce acne olen eetiseee ee oeeene 5.40 6.50 Manometer, Mercury, Ludwig-Cyon, in metal mounting, with three-way stop- COCK CbCe coc se cic ce Se ee ee ears eee ee Oe ee 20.40 \ 24.50 Manowelet,. Combined Spring and Mercury, Hiirthle. See Pfliigers Archiv Bd. RAS EICT | SARC ORE AR Honee dem cciod cucduaingagresant re: So chch eee 48.00 57.60 Calibrated iW Tube for aboveseesee eee Sane eae 1.80 2.15 Lever for adjusting the m anometer to the height ‘of the heart. -90 1.10 Piston Recorder, Hiirthle, with three brass cylinders of 18, 24 and 30 mm in diameter and with counterpoised lever. Improved form operating with- out oiling of the piston:.-......:5..-- Ae See Bees Perera 24.00 28.80 400 No. 42928 No. 42932 No. 42948 No. 42956 AAA SIONAL Markers felecuric Simple mMOGeli aac... elicie sei eslei e letialetie etekels erste erayaetete Vi 42928. se a Deprez electric, for registering very small time intervals, with fine adjustment of writing point, rack and pinion adjustment for length, OL Carrera tote eee ietcdsrekcintscherorefercicie ele oyeverefersieyn:cfcts cvoleie elele alelekels eieyeletesshsiatnie!«\ereiaceiojelsi« 42932. Signal Marker, same as No. 42928 but with two writing points.................. 42936. Wb a3 electric, with the armature of the magnet controlled by a spring adjustable from 50 vibrations per second to 250, by means of a screw..... 42940. | Tambour, Marey, with fine adjustment and double transmission for the writing leversacece a coca Sea ioe CORED An EERE PHC OAR OOOO CRUEL Coot 42944, LAMPOUL PVALCYsOLCIN HIME CLAM te ters ses, cisieta ae eave cle esis ecu eierallevatedeawusieleseierere cieieteyove 42948. oe ss “‘ with fine adjustment of the writing point................ 42952. s “3 em, with rubber membrane held in place by a clamped ring, with adjustment for changing fulcrum of writing lever in order to adjust capsule to the atmospheric pressure..............ceeee-ecceeceeeeeeeeees 42956. Tambour, Marey, Straub’s modification, with adjustment for the membrane by means of milled head, which can be carried on while experiment is in progress. Membrane is clamped in position by metal ring as in No. 42952 and apparatus is also furnished with air valve...................-++20000- 42960. Support, Adjustable, for physiological work, with vertical rod 10 mm diameter, 30 cm high, with fine adjustment on the vertical axis...................-- 401 No. 42960 Duty Free Duty Paid 3.75 4.50 24.00 28.80 42.00 50.40 27.50 35.75 9.00 10.80 4.20 5.00 4.80 5.75 13.25 17.25 24.25 30.85 14.50 17.25 No. 42992 LLL PER EEEEELIL 42964. 42968. 42972. 42976. 42980. 42984. 42986. 42988. 42992. 42996. 43000. 43004. 43008. 43012. 43016. No. 42968 No. 42964 No. 42996 No. 43000 No. 43008 No. 43012 No. 42980 Support, Adjustable, for holding tambours, etc., in contact with the drum, with fine*adwustment ats SA icici 2t,s1s:ee.12j:310,<10,0 66 0. ere cele eemee eee ere eee Support, Large Universal, for physiological use with all adjustments, 55 em high Inductorium, Du Bois-Reymond, for physiological work, with Meyer’s interrup- ter and scale with which to read the position of the secondary coil, with SO0OKturnsolswirete ses ctisscinc.cc-ceeioneiae anise ne senlcoeiebiee een eer Inductorium, same as above, but with 10,000 turns of wire..................... Vertical Form, secondary being carried by pulley over bars, with counterpoises) Withy5;000\turns/of wire... 15... s-cesercbeme tecicaertr Inductorium, same as above, butawith 10/000;turns of wires ance een eeeceeree Electrodes, Fleisch, unpolarizable. Per pair... ... 0 ...00. ws secneec eee es Ludwig, for deep seated nerves, in hard rubber mounting. Per set.. Contact Key, Du Bois-Reymond, on heavy base................ cece eee eee ee ees Commutator;: Bob eparcterstereersto ciel teioveler ieee nest a dleieusievela diese let dere tices ce Reet Canulae, of glass for arteries, with bore of from 2 to 8 | t=) oh 2) BREEN rn ooo AS om GOO ORG CoC or nn mE nO CORRE Ametac cad ncncooceo 6c: 1 tS 1) Semen ere cob onan su sonad nous pou Gane. DOMEET OraroRbdc oad opoceo aoc Canulae, of metal, for the trachia. State diameter in ordering. These canulae rotate and are provided with opening for control of expired air. Each Canulae, same as above, in set of 11 from 2 to 12 mm diameter in steps of 1 mm. (IIT Boboen boon oabooup bsdooD0cOnOUOpUStooSHOODNOUONADeBOORORODDOOCORSSS Respiration Pump, Brodie, with barrel 3 inches in diameter x 11 inches long. By a simple adjustment of the crank the throw of the piston may be quickly altered to deliver any quantity up to 1 liter of air per thrust. The valves are of simple construction and easily reached for examination. Mounted on a board for fixation on the wall of the laboratory............ 402 my No. 43016 Duty Free 18.7 31.50 18.00 21.00 36.00 40.50 1.35 6.75 4.00 3.75 1.05 2.40 2.25 22.50 57.00 Duty Paid 24.40 37.80 21.60 25.20 43.20 48.60 1.75 8.00 5.20 4.90 1.50 3.25 2.70 27.00 68.40 No. 43020 No. 43028 No. 43040 No. 43044 Artificial Respiration Apparatus, Meyer. See Archiv. f. exp. Path. u. Pharmakologie Bd. 47, pag 426. Adjustable from 20 respirations of 1000 ce of air per minute to 100 respir- Duty Free Duty Paid ations of 25 ce. With water motor for pressure of at least 30 lbs.......... 165.00 200.00 Artificial Respiration Apparatus, same as No. 43020 but for water pressure of from 15 CORSO REDS csnteeyotercte etevate ow eletece GIS La Sie Noa ob RONGE cs ee a slajoceeretaml bee ele 185.00 225.00 Artificial Respiration Apparatus, same as No. 43020 but withelectric motor. State voltage and current in ordering sso Yae/aastelteey teeter nepal ag oy ater voles 175.00 210.00 Artificial Respiration Apparatus, same as No. 43020 but with small cylinders deliv- Grin sTEOnlOstO OU CCl air. Deb thLustj.5. nD 4 aa e ee) = 4 aa fe) = > 127) Cy OF IME Ee oa N < No. 43180 USKOFF SPHYGMOTONOGRAPH. The unique feature of this instrument is the simultaneous recording of blood pressure in millimeters of mercury, together with the brachial pulse at varying pressures, and one other tracing (jugular, carotid, apex beat, ete.) In other words, there are four tracings upon the paper, three of which are fixed by the limits ‘of the apparatus, i. e. blood pressure in millimeters of mercury, arterial pulsations at various pressures and time tracing , while the fourth tracing may be taken at will from such sources as carotid, jugular, apex beat, etc. "The instrument has been. recently remodeled and improved, particularly by the addition of a continuous paper roll attachment, carry- ing 20 meters of prepared smoked paper, which is now recommended for use with the instrument. The instrument is now also provided with two speeds at the suggestion of Dr. Geo. W. Norris, of Phila- delphia. See Kraus und Hirsch, Krankheiten des Zirkulationsweges, in Fortschritte der gesamten Medizin, 43, Jahrgang II f. 121 and Dr. ‘Lindemann Miinchener Medizin. Wochenschrift Nr. 45, 1908 f.2338. 43180. | Uskoff Sphygmotonograph, new model with two speeds and continuous paper roll attachment, including von Recklinghausen’s arm cuff and polished mahogany case and one box containing 20 meters of smoked paper recording g strips ready for use. ; DutysRrees..-- eto ,» 110.75 Duty Paid ..<.25.0.40 2 ee ee 145.00 43182. Uskoff Sphygmotonograph as above, but with the addition of a receiving tambour with zero pressure valve, four glass receiving tambours for jugular and other venous pulses, cardiograph attachment for taking apex beat and two boxes smoked recording paper strips, 20 meters each. Duty Frees eee 120.00 Duty Paid 's..3. (As 5 eee 155.00 43184, Continuous roll of smoked recording papers, 20 meters long....................2. 0.2 sees 1.00 43188. Glazed Paper Recording Strips, 510 mm long, for use with | instruments not provided with con- tinuous roll attae preg: and which must be smoked before USING)... 0. ck ee eee eee 75 { 43192. Curve Analyzer, Jaquet, for the accurate measur- ing and analysis of tracings as taken in Physiological or other work. See Jaquet, Stu- dien wber graphische Zeitregistrierung. Zeitschrift fiir Biolo- gie, Bd. XXVIII. Duty Frees... 68.75 Duty Paid...... 90.00 No. 43192 eRe) de el Wi OR Hi Ty Hi Oe IMBLAS 3S CeO) Mi Pe AT INT xX = THOMAS _Co PHILA Einthovyen String Galyanometer with Illuminating System, Electrical Resistances, etc. No. 43240 Photographic Register EDELMANN LARGE ELECTRO-CARDIOGRAPHIC OUTFIT. It is impossible in the brief space at our dis- posal in this catalogue to properly describe the component parts of a complete installation on the basis of the large Edelmann outfit. Complete German literature will be sent upon request to those inter- ested and we give below a summary of the equipment. In the illustrations above L represents the Are Lamp, W the cooling cell, G the Einthoven String Galvanometer with optical system, R, the Photo- graphic Registering Apparatus and A and B the Wheatstone Bridge, electrical resistances, ete. The equipment is divided into five principal parts, as follows: 1. Thread Galvanometer with accessories. Duty Free Duty Paid ASIOG Ee Larse String Galvanometer, PAMtMOVEM! «2c o\6. 2 oc 6.5.6 0.2 are + s1eccieie ie wisiels oleieielaielels aivia‘eis 245.00 300.00 43200. ZEISSPADOCILOIMALICH OD ICCELY G5 FIT tte oye aic)a,s;2)o.c recs - > z A = No. 43468 g 3 e | cc | | 5 oo www taal occ \ No. 43464 No. 43472 No. 43476 No. 43488 No. 43492 No. 43496 No. 43504 No. 43508 No. 43512 No. 43520 No. 43524 43464. Pipette, Mercury, for taking up drops without danger of same entering the mouth................ 43468. Pipette, Mercury, for the convenient handling of small drops of mercury.................+..+005 43472. Mercury Pipette, Heerwagen, for delivery of small quantities of mercury, on stand with clamp. 2: ‘00 43473. Extra Glass Tubes, for abov ve, TiAl fle) Lie) OS See Eee SURES Saree nibs bbe Ne oo arto duoogose 50 43476. Pipette, Ostwald, for calibrating, 2 DCC with two WAarks:... ceqececocs a cieeiic tiesto ces nee 75 43480. as above, with ~; ce graduations over and under the upper mark.............. 75 43484. « < Se Peer SOS zh GwOgmanks:: Axo ys. tteecccrga erty aes a Nee ceL sper touiocdteirel= 65 43488. Pipettes, Mohr, accurately graduated in cubic centimeters and fractions thereof. @apacity, ceh-p ae. oem. 10 1 1 1 2 2 5 5 10 10 25 50 Graduated VOR Cszooe the wo eat ro. 16 ssomenoe __ 20 T= 10 a 20 L To to AG Me reaps arse ais Seeiress 35060 liw2ti‘izj CW 30 35 40 45, 45 .59 65 1.20 43492. Pipettes, Mohr, with glass stopcock. Capacity, cc.................... 0 eee e eee eres 25 50 (Guasvolveniers| io) Ok 5 ero pen do Sano ro She mon OUR DOdnONSAGAORn can mcgob ov Ep ae ae Sa LEYS) eee Or agh b onlde bolic pee untae ine Comat Od treme hi se cite etn ane Seth era aie 1.75 2.00 43496. Pipettes, Serological, same as No. 43488 but with graduations extended to the extreme tip (CESK. Conaaoone Goa ore ocoemaat ce Ocone no DE Ior is 1 1 5 10 GraduatedGtowmechos cas onc acto stseicise s oeloeieis oie wie rho ay ToT: 10 DENY WORE a5 goo calcu: ater itnENcoana he near Aate 35 25 35 40 45 43500. Pipettes, Graduated, Stokes These pipettes are graduated to the tip and are of accurate specifications as to total length of graduations, inside and outside diameter, ete. The total length of the 1 ce pipette is 170 mm and of the 15 ce pipe 334 mm. Capacity, COsen ees aes 15 (Gradiatedttiowcessseccee nee ee a See Sees hae te nee ere saree rte iy wy DEG at Oe Se Be Seer circ don cdckcatacutomicdsad ia 25 -60 43504. Pipettes, Volume or Transfer, with bulb in middle of tube and accurately graduated to capacities named. @apacitys CO xsserccissay-o cite 1 2 3 + 5 10 15 DEVO (eS dogau sea eeu Oe OS OnB Ee 10 11 12 14 15 al ly’ 24 Capacity Ace seer eric cisisanet heresies 20 25 50 75 100 200 J DEY ns soe oeinbee 5 CECE ORO E CO nee erarte 26 RST 35 5 50 75 43508. Pipettes, Volume or Transfer, with bulb low on tube, accurately graduated to capacities named. Gap aicrtyss COasa ete sie ties actors 5 10 20 25 50 100 200 ia Chip eck act icon oi 15 -20 25 30 40 50 -70 43512. Pipettes, Volume or Transfer, without bulb, as used in bacteriological work, water analysis, ie (CETEYOIN SG CE oe oc soanuasneebonoppeedodde mugenrausoonpedascncoboogeaae 1 10 DOE Ne isa. 6 Or UOC TER ORIC ISCO DORI Ree Enea naobOn Gting Aeractacdasoch atc -10 = .20 43516. Pipette, Spencer, for glucose, 50 ec, reading in Brix scale from 5 to 20° in iths.................. 1 mH 43520. “sucrose, capacity 52.096 ec, reading in Brix scale from 5-25° in qdoths....... 1.7 43524. Pipettes, Graduated, designed particularly for use in water analysis and as used in the Hygienic fete oratory of the U. S. Public Health Service for this purpose. The 11 ce pipette has mark at 0, 10 and 11 ce only; the 10 ce pipette is graduated from 0 to 10 cc ‘n single cc; the 2 ce pipette is graduated from 0 to 1 ce in ths and is ungraduated from the 1 cc mark to 2 ce. (CAPACILY NCC ete Ie ake horas ois ahs sa aaa Eo EE 11 10 2 IDEN ceca ern Ce ercist: ce Rhee eaT ema Senet omimootan acco os 25 25 25 43528. Pipette, Capillary, for use in preparing milk smears for microscopical counting of bacteria. Grad- uated to ;45 ce with one mark. With a Bausch and Lomb 6.4X ocular and a 1.9 mm oil i “une sion objective and a tube length of 195 mm, the apparent field covers approximately =\5o sq- em. which gives a convenient factor for computation. See Bulletins 373 and 378 of the New ) Gir ION ROUTE DS LULL ate pae AOA ERNE OGD. COOS bas L0G 6 Senn Oo en Boe Roane On eR ore 1.00 2 » >) = 4 i | ii l l] | 11] \| | | | | At } | | | | | { /; } i \| |p . r iF 4 hI, [ aie) HE [Ey | >he | | y > z | olt l=) ale | rH ea | é af > ii = | ts I F 7 I pa 4 >! Hl > if} 4 x! x\[=| Ht fs | Any AN II t i H a be | ‘ uh ire ; il E ne | (i | A = {. | : Pe ie le | 4. te E 2 loly 1S is z & | 2 fy E ie A H { F \ V | U J pee ey ee 43532 43536 43540 43548 43552 43556 43568 43572 43576 43580 43532. Pipette, Weichardt Hygienic, for bacteriological and serological work. With air filter in metal capsule and screw adjustment to control delivery of small drops. Capacity, jycc in ;ipjths........ 3.00 43536. Pipette, Wassermann Safety, for bacteriologica] and serological work. The glass cap with tubulation is withdrawn with finger over the opening, thus filling the pipette. Withdrawal of the finger from the tubulation provides exact control of the delivery. With pipette y5cc in zijths, gradu- ELGelte sl \aandapoes cen boobadgAbnodcoosaneooran pinieleisiejerelelosieieielal «trie areleh ee eae ant eee 75 43540. Pipette, Syringe, Woithe, for bacteriological and serological work. Complete with precision pipette lec An As thisemosceae en sateen tines ayer ierais aren ens tv ajerere Misiegnitte Ce Ce TO eee aa BP erincitro‘ 6.00 43544. Syringe ODLY FO BD OVE ccc .c.-/eysicis,0 s:0155:eusi cove oy coe areteranecdie sreiaisls.& eaten Otte ole ere ee 5.25 43548. Pipette Safety, Permin, for bacteriological and serological work. Capacity ec....... 500 1 Graduated! toy CO otters seecte a tacarevelc.2i<.oisscieje: dus svalevanageesthebe cate oheerspeetleker tere eee aha roo LOE) eR ee Ceo. on oo eae aaa Reet > tea melee aniciieaat eon bos 5.000 75 1.10 PIPETTES, PRECISION, graduated by weighing at 20° C. in accordance with the specifications of the Physik- alisch-Technische Reichsanstalt with individual control number, ete. These pipettes are offered with our unofficial factory certificate and, in addition, with the Physikalisch-Technische Reichsanstalt cer- tificate and control stamp, 1.e., the official certificate of the German government. Precision Pipettes with Unofficial Factory Certificate. These certificates are made out in the factory in exact accordance with the methods used by the Physikalisch-Technische Reichsanstalt and no pipette is certified unless the error falls within the limit permitted by the P. T. R. The data on these certificates may be used as a check where pipettes are calibrated in the laboratory or with entire reliance upon the accuracy of the figures given. 43552. Pipettes, Mohr, Precision, with unofficial factory certificate. Capacity, Contacte tesisietereiele + scsleysse.)simyejaretslopessse 1 1 2 2 5 10 25 50 Graduated tomccrereeereeeeen ee ene ee eee __1b0 to Ue A Sor Se Bachin..g.hctccee ee eee Asecosoede 95° {8000 85 Skis eS Ie S00) 43556. Pipettes, Volume or Transfer, Precision, with unofficial factory certificate. Capacity Cems 1 2 3 5 10 15 20 25 30 50 100 = 200 Bach ss, «):../.-/wistesietsrsroecs 40 40) 3450—«Ci45 350) 55) 60) 70 SOOO aS ered Precision Pipettes, with Physikalisch-Technische Reichsanstalt Certificate. These pipettes are exactly the same as those described above in workmanship and accuracy but are furnished with the official Physikalisch-Technische Reichsanstalt certificate and control stamp, for which a higher price must be charged because of the German government fee. 43560. Pipettes, Mohr, Precision, with P. T. R. certificate. Capacity; Cesc soc ca settee Oe eee 1 1 2 Zt 5 10 2p 50 Graduated(to, cts snes se eee eee eee ee rou _t0 oy ie Toe oe to ay LDEYG UR et eA eA Hath. 5 aac ouae ones ackde 3.00 3.00 3.10 3.00 3.15 3.45 5.25 6.20 43564. Pipettes, Volume or Transfer, Precision, with P. T. R. certificate. Capacity, cc.........6. 1 2 38 5 10 15 20 25.) S30 SOemOOmem Machin te cena eines 1250) 1250) 250) 22502160) 1:65) 70) 1875 SOP aon aaa 43568. Pipettes, Serological, Precision, with graduations extended to the tip. Recommended where great accuracy is required; with P. T. R. certificate. Capacity, ec......... wo 1 Graduate ditosees asses nee Oe eee OO eee anes Tho Bese se 100 (eB GannS He ana iGernaccnerinthiicn os aco cd cee caobomooonacoRa ae. 3.00 3.00 3.00 414 [Nose Saeed elena Gian © Lala 5 3 H. EHS ORs Mat Ans S Ca Ol MP rAG EN ay, PIPETTES, PRECISION, as used in the Hygienic Laboratory of the U. S. Public Health Service for determin- ing the immunity unit in the standardization of diphtheria antitoxin. See Hygienic Laboratory Bulletin No. 21. These pipettes are standardized at 20° C. in accordance with the requirements of the Bureau of Standards but are regularly furnished without certificate. They are furnished with certificates of either the Bureau of Standards or the Physikalisch-Technische Reichsanstalt on special order only. Outside diameter of the bulbs is in no case greater than 10 mm in order to permit use with spe- cial graduated cylinders used in the same technique. See illustration on preceding page. 43572. Pipette Volumetric, Precision, graduated to deliver 1 cc. For purpose of easy manipulation this pipette ietsUuppuEedemithsuwo etched) bandsmeanitop. sseisses sees eee a ee tl eee -75 43576. Pipettes, Volumetric, Precision, as above, graduated to contain. Capacity, cc..... ol 2 3 4 5 6 7 8 9 10 Bachteces =< Seed eth) 75 -75 75 -75 -85 -90 -95 1.00 1.10 43580. Pipettes, Graduated, Precision, so-called “Ehrlich’’ pipettes, graduated in 1, ce. Graduated irom: = 2c. ge eyo, on-c-2 3 1 ie _Oltolce .07to2ce 1.5 to 3 cc. aC Mga ese ores we ee ee 2:3, 2 aCe eee ee 2.50 2.50 2.5 No. 43600 ania) No 43604 No. 43584 No. 43612 No. 43616 No. 43620 No. 43608 43584. Pipette Box, for sterilizing pipettes, cylindrical form, of polished copper, with tightly fitting lid, 23 inches in diameter by 16 inches high. Will take about 75 graduated pipettes, 1 cc in ;ths or abouusloomihersamentO) coun ae thSo econ cits mee teelneh oer eee eee eae cern ee 1.75 43588. Pipette Box, same as above but of sheet iron................... oapce pEDooDsOAsdadH bocce DHeRUane 1.25 43592. “f “rectangular form, for sterilizing pipettes in bacteriological work, of copper. SSUGE ENG NST EY Oc See OOS SRO EE Se aE ee tad tn niet 13x 23x 10 13 x 24 x 16 DES aoptas ues SOC an mon Dace GAa pate Hn eae eSSceesocgs 1.75 2.50 596. ipette Box, same as above but of sheet iron. ins pins tetas ae se ME SR Se Cy SCO BITE DE Oe URE te ae 13 x 23x 10 13 x 23 x 16 LEG Deets pia. anc > COC ADR BAREH Die cee nEEEa nn seconac econo oee. 1.25 1.50 43600. Pipette Box, for sterilizing and transporting pipettes, with lid and removable end; of brass, nickel plated, with asbestos lining; 2 inches deep by 4 inches wide by 16 inches long............ 7.50 Aapa. seipette: Support, of brass, nickeliplated.... )... aceite: 2-1 tee eeeeeeeeee 75.00 Record Papers, per dozen. <<. .5 nonce eepere wad dle eae eis ceue «teva te ee eRe eee 45) Water Culture Vessels, consisting of Aluminum Double Support............................000- 1.75 Tumbler; plain glass, with feltpapericover:..... +r i Sete een eee -10 Paraffine, hard, for coatingsthejsupports, perlb.....saqee..- oes ae ses eee 20 Lampblack, per Ib... .5..0.:52 dee sedeie craic) enue 22 ais ashe aya, eco Scales: Sie ahs CTO ee eae 12 View of Stock Room Where Goods are Stored in Original Cases 418 No. 43900 No. 43904 No. 43916 No. 43920 No. 43912 3S Sep ZIL DS OOZEED EZ = = No. 43948 No. 43960 No. 43964 No. 43944 No. 43940 43900. Plates, Glass, circular, plain, edges not ground. Diameter emma oes eather ie lea ciate ieee aon 100 ~—s:180 200 Ba chi oro .ceciee Ss etioriting 30010) Rach gach Soe. Dataasusee 06 .08 65 25 43904. Plates, Glass, circular, ground on one side, edges not ground. Drameterspemm s.r naccon clove cie oi iaeneie seiave wnat Sona ote 75 00 oO) 200 LEY Ue ancora te ceeoe ee oemoG aude See Shoe eRe Peco e ese [OSERET LON -18 .30 43908. Plates, Glass, with edges slightly ground and hole in center to admit stirring rod. Convenient for use as covers. ID ANTE re Tha eS ernere ceca cr AD SOC Ee OREO GEOR CTE AEM en Ee fico OGD Gn econ ERTTE AE 75 100 DEG: oodadaadpodie bo cde 30 Dp UOO DEN Den om tnC CHAE Gea OGorner amo COG IAaee eh oernts 25 30 43912. Plates, Glass, same as above but with hole at one edge. TAME TET MTOM Ries es isvehers wl cio tie: tas 10s aiei6:assiaye «inte clolayelehe ala chesaretm a metereiate ae eee alata sioele 75 100 LEG Up ccds COdEDr cpp DoCS e eDOCS Ga nO rear noe corer E eer acriod soe ciao coc ct as aeenote 25 30 43916. Plates, Glass, square, plain, edges not ground. Size tammy eye tetsien sion enlne tow e wieinio sais Starciele eielnoe 75 100 125 150 200 MBSR Cn sapscec ret srehere is areyers Secreiorsrs Siate slo sisi v oe Sees aveie rer te -03 04 -06 -08 16 43920. Plates, Glass, square, ground on one side, edges not ground. SEZ MINTER fon yee a ace cota clarence a Acle ks bl sre eie Says Morea eee 75 100 150 200 | DEVO heiaceaatec icin DOCH COC cei anata ea Aoriciaci cro 04 -05 10 .20 43924. Plates, Heavy Plate Glass, square, ground on one side, edges not ground. SIZE PIII Rats eine cites: bins cece wate 150 175 200 225 250 300 DEG Weqod ek ons Sood SOE ENDO SOUR EE enenese 30 235 -40 -50 80 1.00 43928. Plates, Heavy Plate Glass, square, ground on one side, with edges ground. SSEZESININ Rony rc ae, actarerstoe ee reikvoterolale slaisce Mo 150 175 200 225.280 300 1 DEY (oe oa OGD cco SEEGERS On ORR eee In 35 45 -55 -70 1.00 1.25 43932. Plates, Blue Glass, so-called ‘“‘Cobalt”’ glasses, for observing the potassium flame; edges not ground. Size gMM inc vec ielescicon salsa sciees 50x50 50x75 75x75 50x 100 75x 100 100 x 100 ACH Aarats cfesaia crate visivenrersPoerheisiais ai sieze ais -04 -05 -06 -06 .08 10 43936. Plates, Glass, 200 x 100 mm, of finest plate glass 7 to 8 mm thick, with one end finished in piteh black and the other in pure white. For examination of sputum, feces, etc................. 43940. Plates, Porcelain, perforated, for use in funnels. Diameter, mm...... 201, OS he _ 100 125. —s—«180 175 each ty. cae oa 15 20 25 40 60 15 1.00 1.00 43944. Plates, Royal Berlin Porcelain, for color reactions, 110 x 90 mm, with twelve concavities. Very superior to the common porcelain plate usually supplied................2..... 20 eee eee eee 43948. Plates, Opaque Fused Silica, unglazed, preferable for use as heating plates to wire gauze on account of their cleanliness and absolute resistance to corrosion. Will stand extreme changes of temper- ature without cracking. SIZE WINCHES oes cre crs eieieiee oS 2ycts nis aye two nie Sieieieie sme 3x3 (x4 ee Goi6 9x9 12x12 Macher tn chethick: nase cciseesisccesioc ot oc snsjeses Hf -48 1.08 2.43 4.32 Wachee erin CHChICK =e nen aolereaine ss c's sare sisielene 54 -96 2.16 4.86 8.64 43952. Plates, Opaque Fused Silica, glazed throughout, $ inch thick. MSIZE MIT CHER sretegoicrs cyetaretart ca ave ssteia/s: stele a.cyeieie evevsvaleyoyaevets geen gece West es 919 122 DEG Eee och bc Gobe OS OGn EAA ROCOC See eeeeeo caress 12 1.28 2.88 6.48 — 43956. Plates, Porous, circular, for drying crystals and precipitates, 250 mm diameter..................- 43960. “square, for drying crystals and precipitates. SOLE FAINT ssh Pep es Par IMS PANS (sy Sie o /aa le a avo, chen dues crafer cus eVelabersfeleteserasee 150.200 300 400 DB ea CN recor cte aca setae alos ciara mvc) sc oreonis oye aadisys\acie ars rete ancrotereicie meter 20 55 1.25 3.00 43964. Plate, Streak, Royal Berlin Porcelain, unglazed, as used for arsenic test and by mineralogists; 100 x 65 His -agadoadoas chad Ceuta ne pobeboooeO doo por acO00 UO Onn 0UOPooUNoOoUTOESEStoasccndnsours 45 419 Ur OR Hi: Tis SH Ow Me Ag GO) UME GRE AL New > ve) 4 eo PLATINUM WARE The Platinum Ware listed below is genuine hammered ware from selected factor es in both Europe and America. Our relations with the leading manufacturers enable us to offer it at the current daily quotations observed in the platinum trade. Most of the items listed can be furnished immediately from our own stock and when this is impossible delivery usually requires only three or four days. Approximate weights are given without price. The current prices per gram for the different classifications of ware used in the platinum trade are inserted from time to time on colored slips as our catalogues are sent out. The Care of Platinum Ware. W. C. Heraeus, in the Zeitschrift fir angewandte Chemie, 1992, Heft 37—and 1907, Heft 44, explains the causes of the destruction of plati- num crucibles in the making of phosphate analyses and refers to the fact that the destruction of platinum ware (which is always only a chemical change of its properties) might in many cases be prevented if the crucibles or dishes were not exposed to unnecessarily high temperatures during the process of annealing. The uniting of platinum with carbon, silica, boron, phosphorus, etc., takes place only when the different salts are reduced at compara- tively high temperatures. The susceptibility of platinum toward hydrogen and hydrocarbon while annealing accelerates the reductions considerably. When the combustion is made in a gas furnace, Roessler furnace, ete., care should be taken for obvious reasons, that there is no reducing atmosphere in the furnace. The use of acetylene gas for the annealing of platinum ware is also harmful to the platinum. The combustion of organic substances should be done at low temperatures and the annealing over a blowpipe or in a furnace only when all the carbon has been volatilized. At high temperatures platinum is very readily attacked when the melting of alkaline or alkali carbonate is done in the presence of sulphur or cyanide of potassium. Metals of a low melting point and easily reducing oxydes of metals should, of course, not be annealed in platinum; the same may be said of all reagents which give up chlorine, boron, iodine, sulphur or phosphorus. Frequent cleaning of platinum ware with sea-sand removes alloys formed on the surface. oor ey > 4 ae ) } eT No. 44012 No. 44012 No. 44012 No. 44016 No. 44016 No. 44016 No. 44024 No. 44028 No. 44032 No 44036 A B A B Cc c 44000. Platinum Foil. This is carried in stock 8 inches wide and can be furnished in any length up to 24 inches. Light Medium Heavy MHI GkHEss MN Ms Platinum Cathodes istyleveen es eee een eerie A cas, (@) Diameter; Mss. os ehh ore re ee oN rie 57 25 25 Beng th¥otistem prime tee ee eee Sennen Sy ne, 7 75 ee) 75 Approximate weisht..grams ee oe eee eee hace eee ree 20 12 12 44020. Platinum Gauze Cathode with wire frame Anode. Approximate weight 40 to 45 grams. 44024. Platinum Electrode, with open gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. Approximate weight 12 grams. 44028. Platinum Electrode, with closed gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. Approximate weight 10 grams. 44032. Platinum Electrode, with rotating gauze cylinder. Height 2 inches, diameter 1 inch, of 52 mesh gauze. Approximate weight 15 grams. 44036. Platinum Electrode, with perforated shect cylinder. Height 2 inches, diameter 1 inch. Approximate weight 17 grams. 420 Vv = SE SS = ; No. 44056 No. 44060 No. 44064 No. 44068 No. 44052 44040. Platinum Combustion Boats. ene thy inches... soso neemclecimeia nn aoe 13 2 23 3 33 4 Approximate weight, grams. . 3.0 4.0 5.5 8.5 10 0 12 0 44044. Platinum Combustion Boats, Blair, ¢ is - inches deep by 53 inches long, approximate weight 35 grams; with or without cover. 44048. Platinum Combustion Tube, seamless, with German silver fittings. As used in iron and steel analysis. Made in any desired length or in special shapes according to specifications. 44052. Platinum Filter Cones, seamless, with perforations -020 inches in diameter. Dinmeteranches:.-coaceess «<< e z oy 13 13 is 1} ay 2 Approximate weight, grams.... 1.0 1.5 PAS 40 6.0 8.0 12.0 44056. Platinum Crucibles. Covers are alw ays furnished unless otherwise ordered. NM Denese ceases seein es 1 2 2 4 5 6 7 8 9 10 Capacity cesss-co race sore tants are eS 10) 5 20) 2 eee OO 50 60 70 Approximate weight, grams........... 8 10 15 20 25 30 40 56 60 70 44060. Platinum Crucibles, Gooch form; weight includes cover and cap. CREATAS (Rhe obsspaboop neo auboane san songo0o coe 10 15 20 25 30 Approximate weight, grams...................... 13 18 24 29 34 44064. Platinum Crucible, Gooch, low form, with bottom permanently fixed, as used in asphalt and bitumen analysis; capacity 30 cc, approximate weight 30 grams. 44068. Platinum Incinerating Pan, rectangular shape, with flat bottom. Capacity: (Col vassacscrens coc teisia sie. a ove anppleise = : Approximateiweight, grams: ..c70:.35 -. cece es one ee eee a) 14 | No. 44080 No. 44092 No. 44096 No. 44100 No. 44104 44072. Platinum Dish, flat bottom, with straight sides and without lip, as used in milk analysis, capacity 45 cc, approximate weight 17 grams. 44076. Platinum Dish, without lip, as used in wine and water analysis; capacity 100 cc, approximate weight 20 grams. 44080. Platinum Dish, with lip, as used in water analysis and iron and steel work, 45 ce capacity, approximate weight 16 grams. 44084. Platinum Dish, Payne, flat bottom, with wire rim and lip, as used in fertilizer analysis; capacity 100 ee, approximate weight 40 grams. 44088. Platinum Dish, with flat bottom and straight sides, with lip, as used in sugar analysis; 35 ce capacity, approximate weight 16 grams. 44092. Platinum Dish, round bottom, without lip, as used in sugar analysis. Capacity te sei als core enene Ses Sars si byecs os dm Stan See Boe bieeie oe etelelote 20 25 Approximatesweight.) Cramisso8. 05S a Ase fae ns oo estes eee eee ee haya ee ore 10 12 44096. Platinum Dish, flat bottom, with handle and without lip. As used in sugar analysis. This dish is also made for sugar work without handle and with lip. Please eyed in ordering. Capacity. Cais en ec cte eetie Sco oie 55 sroawtese Plc eee IS eres 10 20 25 35 Approximate: weight, Prams. 2.55.0: fe: cies dee icles Re 2 = 10 14 18 20 44100. Platinum Dish, deep form, with handle, as used in sugar analysis. Also used in sugar work with lip and without handle. Please specify form in ordering. Capacity 30 cc, approximate weight 16 grams. 44104. Platinum Dish, deep form, with two handles and lip. Capacity 45 cc, approximate weight 15 grams. 421 44108. 44112. 44116. 44120. No. 44108 No. 44112 No. 44116 No. 44120 Platinum Dish, with flat bottom and straight sides, with lip. Capacity celpeccm cen eee ee 80 100 125 200 250 300 Approximate weight, grams... 32 35 40 56 70 80 Platinum Dish, Blair, flat bottom, ‘with or without lip, with either wire rim or solid rim. As used in iron and steel analysis. Capacity, COusti cis cenit sleene cee eee 280 380 525 Approximate weighty erams eee ee ne ee gaa 80 100 120 Platinum Dishes, with lip. pee “= 20 25 35 50 65 75 Approximate weight, grams.. 5 6 8 : 12 17 22 25 Capacity, ec. Ssoupocacoad eds Al) 125 150 175 200 250 300 Approximate weight, grams......_ 33 42 50 i Ge 80 —_-100 Platinum Dish, Classen, for electrolytic separation, with either polished or sand blasted inner surface. Capacity 250 cc, approximate weight 40 grams. EE See eee SERIE eeyeeeatetreececeeeeertct ictet tt eter i oe ae feett i ea a No. 44148 i No. 44124 No. 44128 No. 44124 No. 44128 No. 44140 No. 44144 No. Hat56 Square Square 44124. Platinum Spatula, round end or square end, 3 inches long, approximate weight 7.5 grams. 44128. same as above, but with wooden handle. Approximately same weight. 44140. Platinum Triangles, with either twisted or solid ends. Monakercrucible 1ccassm-ncaccses selene 10 15 20. 2 30 40. 50 GOREZO Approximate weight, grams............... 5.0 (730) 1005 125012204 O ICOM SAO RZ0r6 44144. Platinum Pan, with holder, for calorimetry. Weight of pan 5 grams, weight of holder 6 grams. 44148. >) Platinumawire:Gauze-a ilesh; <1... 22) sce eset eee ine haere eens ee eee 52 45 Diameterxof wire samches:.. oc. cW. a swacinos eae eee ones eee ee aoe eee 004 | 0085 Approximate weight per square inch, grams.....................0--00---20e00-:- .550 1.500 44156. Platinum Blowpipe Tips, as illustrated, types A, B or C. No. 44220 No. 44244 ama iw” 44208. 44212. 44216. 44220. 44224. 44228. 44232. 44236. 44240. 44244, No. 44232 No. 44240 Pliers, steel, with pointed nose. Jaws are flat inside. ene Gh WINCHES. ose yrasray Versace sisisiaretn ©. <1avcoee salar osie ee RS eee & 5 6 DING Nine og dine sopoosen sd0gudacoNodEomCODSnBSeauenochoscoo ToKccunsOdEeoS 40 50 60 Pliers, steel, with flat nose. hen p thesin ches tae mjsrsataccte ce sree Whore ove) sia sstersrerere ye Era eee Re To 4 5 6 LEYS) has frg cing nett ae aC aE RIOR inc te et Sete Cee Ee ead Rae t aie E 20 30 35 Pliers, steel, with flat nose, side cutting. Length, ANI CHES! eAseaieaee te Ge STere ae On Soe eee a eee mos 6 8 lDEYE 0 God 6 BARGE Gr noo OUR CHOATE Ce Conc EOE Been aacinis oct oeaenceeS -70 80 1.40 Pliers, steel, with round nose. For bending, etc. Length, RICHES sects Ms ers eevee oo eis eee EEE 4 5 6 JOEY) (he. daenidnns Ger arte ea eee aes Heme ones. aoGk occ ccbo emcee 20 30 35 Pliers, steel, end cutting. Length, HOY O) NSE GR Gate BOTT a oie ACEI IPE ict ere Sorta ae ccaditiod. A Me 4 Paes 6 WECM scoscnocosonsdaoveseseosbose SODECIOOOC Ode ODS CaODODDAseONSAeOeREC -70 75 85 Pliers, steel, with diagonal jaws for cutting. Men pth cI Ness aca tresecstststeseratoyajeja Selecs,sayaveyereyaa ate Soe MERE EOE ae 4 5 6 JOE tad o plan bod Gone Eom ROO Onc arn ESE mmrano aon cts ond Suan one 75 -80 -90 Pliers, Button, straight, for holding buttons while brushing, 5 inches long...................-..-.. 50 Pliers) casstongs onpipe wreneh, Sunches longs... asnessetenie creer ote eee tonne -80 Pneumatic Troughs, of heavy glass. IW HO, Siehia ys roles REO aa eR oo OURAN Nes dean ee es are Neha 8 250 300 350 Witd thegmim se tec eee cc ita ssiecemeceises chews eee Ree eee one 150 200 250 ra Hat WSGR Ab OShg cota RET Oe eee Roa EEG bom se sos onooMSore 150 150 160 EO oe Aso Capo CO pce SOC nGOUOT een apr manor bea ammrarenoGhoacDooec: 2.50 4.00 5.50 Cylindrical Sheif for pneumatic troughs, so-called ‘‘ Beehive,’’ of glass, 72 mm high by 104 mm diam- GS Hog enced a nC ROCCE Ane Ene cd COC DERE ROe PBA Andra Snr cdinncatcdv3 oon cone Moran OSE terse -50 Pneumatic Troughs, of japanned tin, with sliding shelf and overflow. Beneth; anchesss asisiectkc stacks ae la aiaoee 10 10 12 15 18 Width stiches’ csnnerott rote nile nc nee cere 7 7 9 11 12 eights inches sic crate cteists cieleiorel= crerernlovs Sore eens cise 4 5 5 6 8 JOEY basics dean ROCA AG CUSOARROERICSE Crmonenrcrs 1255 1.35 1.50 2.00 3.00 Porcelain Shelf for pneumatic troughs, of glazed porcelain with radiating lugs on the top, tubula- tion for rubber tubing and three supporting legs. The tubulation connects with the center opening only. Method of use is shown in illustration..................00..0ceeeeeceeeees 1.25 423 A R Ty H U R H. 1 leh 1) M A S Cc oO M PE A N ay POLARISCOPES eso | . _.-} For Urine Analysis oe] sd For General Purposes asi) (' For Sugar Analysis No. 44300 No. 44312 Polariscopes for Urine Analysis. 44300. Polariscope, Ultzmann, for urine analysis by means of either day or lamp light. With a tube of spe- cial length so that the angular rots ation in degrees is equivalent to 1% glucose coutent. By means of verniers readings are made to 75 Complete with suppert as shown in illustration. Mu tygR reece cceicte sls isisnyeicewie eves Dee, Stock: ¢ ..0.%.0002 0 eae eee 38.00 44304. Extra Glass Tube for urine work. MN) typ reese ee Ot eaece ees 2.10 Stock... «s:dcccow sat cero erate 3.50 44308. Extra Glass Tube of 200 mm length by the use of which this instrument may be used for purposes other than urine analysis for substances where the specific rotary power is within the limits of the rotary scale. DU tYIR ECs ists see see ieiar ss lerereycioe 2.10 Se: Gare Gon ccoooSaccs 3.50 44312, Polariscope, Schmidt & Haensch, Mitscherlich, with Laurent Polarizer. With circular scale reading to 1° of arc and by means of verniers to 75°, equal respectively to 1% and 75% of glucose in urine when the special tube of 189.4mm is used. For use only with monochromatic light from a sodium flame. With one patent tube of 189.4 mm and one tube of 94.7 mm and gas sodium lamp with platinum ring, but without case. Duty Bree re net leveisciee otinrsece ices 56.55 Stock. o.cc0.c.cno. sec eee eee 75.40 44316. Case, for above, of polished wood, with lock and key, taking polariscope tubes and vertical pillar but not providing for the lamp or tripod base. IDNAAlD Cans posdaceeeso DoOnBe moe 10.50 Stock Explanation of the Use of Mitscherlich Polariscope in Urine Analysis. For urine analysis tubes of special length, i-e., 189.4 and 94.7 mm, enable the user to determine the percentage by volume of glucose in the urine without special calculation. When the longer tube, 1.e., 189.4 mm, is used the rotation obtained in degrees of arc is directly equal to the amount in grams of glucose contained in 100 ce of the solution. When the tube of 94.7 mm is used for darkly colored speci- mens. the result must, therefore. be multiplied by two. As the specific rotary power of albumen is the same as that of glucose except that the latter is laevo rotatory while that of glucose is dextro rotatory, this fact enables the investigator to determine the percentage of albumen when same is present. The usual method of procedure is as follows :— 424 AGAR, aby Hy WW) OR He Dh he On eMa ACTS GeO IM. MRS A NS oy If the urine is not clear, i.e., if it is clouded, it must be filtered quickly through a soft filter paper. If it is so strongly colored that the dividing line cannot be clearly defined through the long tube, the shorter tube must be used. If this does not give a better result the urine must be slightly discolored by being poured into a flask containing pure dry animal carbon or by being mixed with 7¢ part of lead acetate and then filtered. In this case the reading of the rotation must be multiplied by 1.1. The temperature should be within 15 and 20° C. The tube is then filled and placed into the instrument and the reading in 345 degrees will give the percentage of glucose. If the urine contains albumen, two readings will be necessary. As albumen gives a rotation in the opposite direction to glucose, the total reading in presence of albumen will be equal to the number of degrees for glucose less than that for albumen. Before effecting the second examination the albumen must be removed. 100 cc is boiled in an evaporating dish and a few drops of acetic acid are added until the solution reacts as acid. The solution is then filtered and the filtrate washed and diluted to 100 cc at 18° C. The second polarizing test will now give the percentage of glu-~ cose and the difference between this reading and the former gives the percentage of albumen. Illustrations. 1, Almost colorless urine without albumen; clear. Observation tube 189.4mm. Equal intensity_in both halves of the field obtained after a turn of 2° to the right. Vernier mark 9 coincides with the circular division, i.e., 2.9°. Percentage of sugar = 2.9%. 2. Urine without albumen, clear, but of an intense color. Observation tube 94.7 mm. Equal intensities at 1.5°. Percentage of sugar = 2 X 1.5 = 3.0%. 3. Brown urine, no albumen. 100 cc mixed with 10 ce lead acetate. Tube = 189.4. Equal intensities at 2.9°. Percentage of sugar 2.9 X 1.1 = 3.19%. 4. Brown urine, no albumen. Tube = 94.7 mm. 100 cc mixed with 10 ce lead acetate. Equal intensities at 1.3°. Percentage of sugar 1.3 X 1.1 = 2.86%. _. 95. Clear, almost colorless urine with albumen, tube 189.4 mm. a. Determination of the first rotation. Equal inten- sities after turning to left at .56°. b. Separation of the albumen; equal intensities without turning analyzer, i.e., at 0°. Percentage oi sugur = 0; of albumen = .5%. 6. Clear urine with albumen. a. First rotation, equal intensities at 2.7°. b. After removal of albumen; equal intensi- ties at 3.1°. Percentage of sugar = 3.1%; of albumen 3.1 —2.7 = 0.4%. 7. Sucrose solution. Observation tube = 189.4 mm; equal intensities at 5.2°. Percentage of sucrose=5.2 X3=3.9% /o- No. 44324 44320. Polariscope, Schmidt & Haensch, with Jellet-Cornu Polarizer and Wedge Compensation, with Direct Reading Linear Scale. For use with ordinary white light such as a petroleum lamp, incandescent lamp, ete. When a 200 mm tube is used the glucose content present in the urine is read directly on the scale to 45%. Where a highly colored specimen of urine is to be examined tubes of 100 mm or 50 mm are to be used, in which case the reading is to be multiplied by 2 and 4, respectively. Complete with one each of patent tubes No. 44552 of 200, 100 and 50 mm length, Petroleum Lamp No. 44516, on adjustable stand with asbestos cylinder as shown in illustration but with- out case. Duntyihrees.. ose en teens 87.30 Duty: Paidt 22s peer ce eect oe eee 116.40 44324. Polariscope, Schmidt & Haensch, with Jellet Cornu Polarizer and Wedge Compensation, with Direct Reading Linear Scale. Exactly same as No. 44320 but with analyzer and scale in new dust proof mounting and with special Osram electric illuminating device, which serves at the same time to illuminate the scale, with incandescent lamp used as resistance so that connection can be made with ordinary lighting circuit. State voltage in ordering. A most convenient and satis- factory outfit for hospital and other uses where many routine sugar determinations in urine samples are to be made; without case. Duty Free Fee sooo 119.10 Duty Paid! j.c3eeceissesane ences 158.80 425 Wo dsl WwW Is H i He Oe Me Ass Cy OR IMa SE Ag Nees 44328, 44332. 44336. 44340. 44344. 44348. Polariscopes for General Purposes, with Divided Circle. For use with Monochromatic Light. No. 44332 No. 44336 Polariscope, Mitscherlich, Schmidt & Haensch, exactly the same as No. 44312 but with bichromate cell and tubes of 100 and 200 mm in length instead of the special urine tubes. Reading to ;,° and useful for a variety of work in the investigations of wine, beer, oi's, etc., where a great degree of accuracy isnot required. With gas sodium lamp with platinumring. At extra cost a Ventzke degree scale is furnished on these polariscopes. See No. 44356. Mutya bree ccc: to. c ce oe es 59.25 SUOCK oiniceser= olereiaie ole sreseielel teen 79.00 Polariscope, Mitscherlich, with Laurent Polarizer, Schmidt & Haensch, with divided circle reading in single degrees and by means of verniers to 3\5°. With illuminating device for the divided circle by means of mirrors, and with bichromate cell and one each patent tubes 100 and 200 mm long, gas sodium lamp with platinum ring. In polished alderwood case with lock and key. Dutyshrees neces. cece 138.60 Stock... S002 22 sae ee ee 184.80 Polariscope, with Lippich Polarizer, Lippich, Schmidt & Haensch, with divided circle reading in 1° and by means of verniers to ;4,°, with simplified protection and mirror illuminating device for the scale. On tripod support. With new arrangement for connecting the lamp stand to the base of the polariscope so that it is always in exactly the right position. With bichromate cell, gas sodium lamp, one each of 100, 200 and 220 tubes, in polished alderwood case. Recommended as the most satisfactory outfit for general laboratory work. Duty tBree serra. ceo ceusacons 187.50 Duty Paid) 2.5.00... .cne eee 250.00 Polariscope, same as above, i. e., including lamp, bichromate cell, alderwood case and new lamp arrange- ment, but for 400 mm tubes, and with one each tubes 100, 200, 220 and 400 mm long. Duty Pree. cient. cetera eee 200.70 Duty: Paid........::..... 35.0 eee 267.60 No. 44344 Polariscope, exactly same as No. 44336, but on trestle support, and without case. DP utywRree: {ceo acccs cease chenres 211.50 Duty Paid. ..: 2... 555.02 oct 282.00 Polariscope, exactly same as No. 44340, but on trestle support, and without case. Duty Freese jeoscces sce nesoaeces 223.20 Duty Paid: :.... 05. sc. eee 297.60 426 eet ae He Uo OR H. a0 Jal) INI ZN as} CG OF iil YIN Ye Optional Equipment for Polariscopes, Nos. 44336, 44340, 44344 and 44348. 44352. Triple Field Polarizing Arrangement for greatly increasing the sensibility as well as the safety and convenience of the adjustment. Duty Breesextra: ....e- oc sec ee- 30.00 Dutyseaid extras. eee eee 40.00 44356. Extra Ventzke Degree Scale in addition to that reading in degrees of arc. The Ventzke scale by means of a third vernier reads to 75% of cane sugar. Duty Mreeswextrat a -y-i ce see te) ee 12.00 Drtymeaid jextratee ce screens 16.00 44360. Illuminating Device for the verniers consisting of a miniature 6 volt electric lamp in place of the reflect- ing mirrors. IDWHAZ A O.4 it Gasp ecoocucacrcnsne 9.00 DutysPaid;extra.jo..c-. cee sceee-- > 12200 44364. Accumulator, three cell, for use with above. Duty Pree; extras. ccs. accnseccinen L000 DutysPaid. extras cose ce cierooe. 25000 44368. Glass Case, Folding, for use with instruments with trestle support. Horeeolariscopeswithicubes simmer seca ceo eee eerste eistelelomteierersi-t 2205 400 ID}TAP eOe dacoep coconOnaos bid AD CoSECAnemD cools condon6 60snCcUOOudocp OROUCOUn 15.00 15.90 TDi id (ee ae Be cn HAT aC GG TE nnG Sac DOO TC dOUS SoS acm oUGeMa sate 20.00 21.20 44372. Glass Case, with Base Board, for use on instruments with trestle support. See illustration page 431. Horpeolarisc ope awit luo es oun ete repays eiciepey-rere etary yee ete oe eietereeictaleraraielesielerers __ 220 400 Dutywhrees 4 aees ee soe een LON. 35. ba eac anna ntebeOree 25.50 27.90 UGA ald eer yey creates wiace ise es Pe EE nn teens een a hiots.3 Seto oo OD On OTe 34.00 37.20 No. 34376 44376. Polariscope, Schmidt & Haensch, with Lippich Polarizer, for both Macro and Micro Polarisation Experi- ments. Consisting of Lippich Polariscope No. 44344, on trestle support with the addition of three diaphragms of different sizes on the polarizer, a direct vision spectroscope adjustable for all wave lengths and with Nernst lamp for illumination of spectroscope which also serves to illuminate the mirrors of the scale of the polariscope. Operating on either direct or alternating current. Voltage must be specified in ordering. Because of the great variety of work for which this instrument is intended no equipment of tubes is included. Without Case. Horsbubessemams-eeecotcperiemisisistietreie ceriateis teresa oloter-tolersleioneestelonatsiets e220 Oe 600 IDA? LITER: songes Gndoo on Ko sOU POOPED nooo DOOD oD oUNbooU on EEdS OO 382.50 391.50 403.50 DDYITS ZEA EAE We Anetta Set coo oa ORDO Onc oC aoe Don nooo REDE ECS 510.00 522.00 538.00 44380. Polariscope, Schmidt & Haensch, Landolt with Lippich Polarizer, with new arrangement for taking not only all kinds of polariscope tubes but other heating vessels, cooling vessels, electrical devices, etc. The polariscope proper is as described under No. 44344, with trestle support. With ad- justment providing for the accurate centering of the optical system at all times. Without Lan- dolt heating device G shown in cut. With special lamp after Landolt. For tubes up to 200 mm in length but without any tubes or case. Duty Free ys: 32/--\scecscasre ssc s- 228.80 DutyePaidstcececteece seer 298.40 44384, 44388. No. 44380 Special V Shaped Trough to rest on supports ce for any kind of tubes. Duty Free, extra.. 5.40 Duty Paid, extra:= 44-2 7.20 Heating Device, Landolt (G in illustr ation) consisting of an asbestos jacketed brass vessel with adjust- able lid, thermometer reading to 100° C. and a ‘polarise ope tube, gold plated inside, 100 mm long set in a glass cylinder. Duty Free, OXxtraee tn ern cee 19.50 Duty Paid; extrass.- eee 26.00 44392. Electric Heating Device, Abderhalden, for constant temperatures, for use on No. 44380. The use of this device obviates the use of an incubator in the Abderhalden technique. See Hoppe-Seyler’s Zeitschrift fiir Phystologische Chemie, Band 84, Heft 4. Duty/Bree:eo oe 90.00 Duty Paid. Roo boda oo) VAM IN 44396. Special Tubes, Abderhalden’s for use in above, 20 mm long and con- Duty Free Duty Paid Galina o32) CCH ee en 3.00 4.00 44400. Special Thermometer, Ab- derhalden’s, for use in above — 20° to 80°C. .. 2.25 3.00 44404. Special Resistance, for MWOVolts sence 12.00 16.00 44408. Special Resistance, for 220 voltsh-eereemeet oer 15.00 20.00 Note.—The above described Polariscope, No. 44380, with the special Abderhalden Tubes No. 44396 and if desired, the special Heating Device No. 44392, is used and recommended by Prof. Abderhalden in his work on the protective ferments of animal organisms and the early diagnosis of pregnancy by the optical method. We are pre- pared to furnish detailed estimates on this equipment. Abderhalden Electric Heating Device No. 44392 in position on Polariscope No. 44380 and with Rheostat 428 eR ele Et iW) SR H. i He [OL iM, =A. Ss C7 70; (MM SR yA AN < No. 44412 44412, Polariscope, Schmidt & Haensch, with Lippich Polarizer and Fischer Micro-Polarisation Attachment. On trestle support with direct vision Spectroscope with Nernst lamp illumination. Voltage must be stated in ordering. The spectroscope is permanently adjusted for the D line. With triple field polarizer arranged for the observations of very small fields. Will take ordinary tubes up to 220mm in length. With one micro tube after Fischer 50 mm long .1 ce content, and one 100 mm long, .2 ce content, but without other tubes or accessories. i Dal eee R ances eee eer er) DWutysP aide ee eae ees 489.60 No. 44416 44416. Polariscope, Landolt, Schmidt & Haensch, similar to No. 44380 but with the addition of a Direct Vision Spectroscope, but without tubes, case, Duty Free Duty Paid or source of light for the spectroscope................-..--......-- 385.50 514.00 44420. Nernst Lamp Illuminating Apparatus for the above Spectroscope, as shown in illustration of No. 44376. Extra........................ 27.00 36.00 44424. Direct Vision Spectroscope, only, asin above outfit, specially arranged for use with the Polariscope, mounted on special base................ 150.00 200.00 44428. 44432. No. 44428 Poiariscopes for Sugar Analysis (Saccharimeters) As these instruments are all supplied with either single or double wedge compensation they may be used with white light of any source but the electric illuminating device No. 44476 is specially recom- mended. All of the outfits are supplied with the bichromate cell as shown attached for use in illustration No. 44428. The scales are graduated in Ventzke degrees for sugar analysis but the instruments may be used for other purposes by using the factor 1° Ventzke = 0.34657° angular rotation for D by which factor Ventzke degrees are converted into degrees of arc. As regularly listed the instruments are sup- plied with the double Lippich Polarizer with the triple field Polarizer as optional equipment. Polariscope (Saccharimeter) Schmidt & Haensch, with Single Wedge Compensation, with linear scale div ided on Nickelin, reading directly from —25 to +100° Ventzke. With new dust proof mounting for scale and analyzer, double Lippich Polarizer and bichromate cell. For tubes up to 200 mm in length and including one each of patent tubes No. 44552 of 100 and 200 mm length but with- out lamp. On tripod support as shown in illustration. In polished alderwood case. Duty Breet: scons ees 142.20 Stock... 02502: cohen aoe eee 189.60 Polariscope, same as above, but for 400 mm tubes, and including one each of No. 44552 patent tubes 100, 200 and 400 mm length, in polished alderwood ease. Wutywhree terse es Ae hascs ote 152.10 Duty Paid: . 32.22.02: se eee eee 202.80 Polariscope, exactly same as No. 44428, i.e., with 100 mm and 200 mm tubes, but on trestle support and without case. Duty Free......... 147.00 Stock ..;.. ...csemeas 196.00 Polariscope, exactly same as No. 44432, i.e., with 100 mm, 200 mm and 400 mm tubes, but on trestle sup- port and without case. Duty Free... 156.00 Duty, Paid-2.2-5-c6 208.00 No. 44436 430 AY IR, Ik He Us OR H. Te HeOew Mr Ay :s CeO} IM SRE TAN ~< No. 44452 with 44476 Electric Illuminating Device and Reading Lamp used as Resistance 44444 Polariscope (Saccharimeter), Schmidt & Haensch, with Double Wedge Compensation, and linear scale reading from -100 to+ 100° Ventzke. Otherwise same as No. 44428. With one each 100 mm and 200 mm tubes, on tripod support, in polished alderwood case. Dutyahrees ee eee eee 197.70 Stockese 2524 See a ROE 263.60 44448, Polariscope, same as No. 44444 but for 400 mm tubes, including one each 100 mm, 200 mm and 400 mm tubes, on tripod support, in polished alderwood case. Duty Frees 25 855-2 ... 210.60 DutysPaid: 5%. <<, sec oesceteds eee 280.80 44452. Polariscope, same as No. 44444 but on trestle support. Including one each 100 mm and 200 mm tubes but without case. Duty Free.......... .. 202.50 Stocks. Aer tines er ent senlees 270.00 44456. Polariscope, same as No 44448, 1.€., . for 400 mm tubes, but on trestle support, including one each of 100, 200 and 400 mm tubes, but without case. Duty-bree: .3. kc caw- fC aeetean:s 217.50 Duty, Paid: <3 noteeaao an iets 290.00 44460. Polariscope (Saccharimeter) Bates, with Double Wedge Compensation, with variable sensi- bility and brightness (Fric’s U. 8. Patent, Feb. 12th, 1907). By simply turning a milled head both analyzer and polarizer Nicols are rotated simultaneously through the correct angles to give any desired sensibility and brightness without change of the zero point or other corrections. The half-shadow angle is shown by the ‘‘degree of brightness”’ scale which is in plain view of the operator. This arrangement permits of readings under theoretically perfect conditions. The scales and verniers are etched upon ground glass and read by transmitted light. The ob- jectionable black line between vernier and seale on the metal scales commonly used is thus avoided as well as the expansion co- efficient. The scale can easily be inter- polated to 0.01° Sugar. Scales read up to a 100° Sugar. Attached to the top of the analyzer case is a horizontal thermometer reading from 10°-40° C., whereby the temp- erature of the interior of the instrument can be ascertained. For 200 mm tubes. Complete on stand, with one each of 100 and 200 mm tubes, in case.......... 850.00 44464. Polariscope, Bates, exactly same as above, but for 400 mm tubes. Complete on stand, with one each of 100, 200 and 400 mm tubes, in CASE ae iacasate Ree Nesoe cicisieloeisisnseree= 900.00 44468. Polariscope Tube, Bates, of metal, with a 9mm bar to eliminate danger from bending and to give mini- mum deep ‘polarization from wall reflection. The weight is carried upon two shoulders which are integral parts of the tube, and not upon the caps. IE AiT a Hie Teen BOR RABE RRA AAR ERE Hae EEE noniTes anon cama domosdcos Seo sOanEdee 100 200 LOS 2 gene Sean oS Da OC rE oR One ET arco ch COne. ose aon acon eS ERoone .. 4.00 4.00 No. 44460 431 No. 44476 Fig. 13 Note.—Fig. 13 illustrates the new arrangement for adjusting quartz wedges whereby one milled head is always protected when the other is exposed. The position of the milled heads in Fig. 13 is ‘that of the instruments with tripod support, while on the instruments with trestle support the milled heads occupy the position shown in No. 44452. 44480. 44488. 44492. 44496. No. 44492 Optional Equipment for Sugar Polariscopes. (Saccharimeters.) Triple Field Polarizing Arrangement, for greatly increasing the sensibility as well as the safety and convenience of the adjustment. Cannot be attached to an instrument after delivery. Duty Hreesextrassn acces 30.00 Duty Paid, ‘extra.-7.- eee 40.00 Electric Illuminating Device, with special Osram lamp. With mirror arrangement for the illumi- nation of the scale, lamp for resistance provided with shade to illuminate note book; adaptable to ordinary lighting circuit. State voltage inordering. Shown attached in No. 44452. Dutyihreesextras>--- eee eee 40.50 Duty, Paidsextra. 2 eee eee 54.00 Special Tropical Finish, recommended where instruments are to be used in moist and tropical climates, insuring protection to both metal and optical parts. Duty Free, extras cde el aalesrociuas 4.50 Duty Paid; extras... ...... eee 6.00 Thermometer, in analyzer with projecting stem for convenient reading as in Fig. 13. Duty Freet asses. cee eee eee 4.50 Duty Paid fa. see eee 6.00 Case, of polished alderwood, with glass sides and base board, for covering the Polariscope in its work- ing position, with room for lamp. Tocover polariscope taking tubes...... 200mm 400 mm DM utyBree: oi. jason meee Oe I eee lerse Nee Gieieisiotecs alataré «Me 25.50 27.90 Dit hal 1 0 Bae eee eRBEeeeh Adon coceiodOna ic COMM On oe Teaneeeee meer cao 34.00 37.20 Case, Folding, of polished alderwood. with glass sides, for conveniently covering Polariscopes with trestle support in the laboratory. To cover polariscope taking tubes...... 200 mm 400 mm Durty Bree asso mate cas crt ee ee eae raters eratens Ts Sins Ee ee 15.00 15.90 Duty aids ccisccaneicie rote ORO ee Ein Clase eee 20.00 21.20 No. 44500 No. 44508 44500. Polariscope Gochennetet) for Beet Sugar Investigations, Schmidt & Haensch, with restricted scale reading from 0 to 35° Ventzke, single wedge compensation, for use with white light. With direct reading linear osles engraved on Nickelin, with new dust protecting device for analyzer and com- pensation, and with bichromate cell. On tripod support with two 200 mm tubes, in polished alder- wood case, but without lamp. Duty Free. SP ee eine. 1 100.20 Duty Paid Saeko ce se es 133.60 44504. Polariscope, exactly same as No. 44500 but on trestle support and without case. ButysBree soc assess sen wi wee 105.00 Daty Raids. 25 oF cha ce.os ssc ee 140.00 44508. Polariscope, exactly same as No. 44504, but with both circular and linear scales. DutyRErees ss55.5. 5 554ccseen See: 171.00 Duty Paid ees: ccs sees =v Cee0O 44512. Polariscope (Saccharimeter) for Beet Sugar Investigations, Schmidt & Haensch, similar to No. 44500 but with special scale reading from 80 to 100% so that with the use of 400 mm tubes the reading is direct. For 400 mm tubes only. With two 400 mm tubes, but without case or lamp. LDA CR ee ne 110.10 Duty Raid. ose eee eee 146.80 Note.—With the instruments for beet sugar investigations, i.e., No. 44500, 44504, 44508 and 44512 it is recommended that the normal quartz plate No. 44612, for the control of zero, be purchased. No. 44524 7.20 44520. Polariscope Lamp, Schmidt & Haensch, Gas, on adjustable support. DtyR Rees ne etc ss ek ae .20 Sah ee oon co attein cr omtencte 9.60 44524. Polariscope Lamp, Schmidt & Haensch, Hesiie on adjustable stand. State voltage in ordering. BntyMrees- ens .c oo st ie eee 10.80 A ee ee be ae SAM AE e a seen, 14.40 Note.—The above three lamps are recommended for use with all wedge compensation instruments when the special electric Osram is not used. 433 No. 44560 44528. 44540. 44544. 44548. 44552. 44556. 44560. 44562. 44564. 44568. HPO Mie Ay eS Cc {id No. 44540 No. 44540 No. 44552 No. 44552 With slip cap With screw cap With slip cap With screw cap O} SMi SBR AL SaiNG asy, No. 44564 Polariscope Lamp, Schmidt & Haensch, on adjustable stand, with sodium ring to give monochromatic sodium flame. As illustrated in No. 44328 and 44336. With Bunsen burner for gas. DutysFreeznc heer eee 10.20 Stock 4P.....s dani 2c. .cslocd eee 13.60 Polariscope Lamp, Schmidt & Haensch, Alcohol, with platinum ring for sodium flame. Duty: Preesin mired. sete ot nine 12.60 Stock Polariscope Lamp, Schmidt & Haensch, Landolt, Gas, with special Bunsen burner, on adjustable stand, with rectangular chimney and two nickel holders for the sodium chloride, as illustrated in No. 44380. Duty: Rreen scan te aes eee 13.80 Duty Paid) 5000823 eee 18.40 Polariscope Tubes, Schmidt & Haensch, Glass, with either screw cap or slip cap. ihengthsimimyeceneee. ene 50 94.7 100 189.4 200 220. ~——-400 Duty plree in. pancccee ase 2.40 2.40 2.40 2.40 2.40 2.40 2.70 Stock: iaswteced conte tene ste 4.00 4.00 4.00 4.00 4.00 4.00 4.50 Extra Glass Tubes only for above Hor tubessimméine.ceseceeees 5094.7 _ 100 189-4 ~——-200 220 400 DULY Bree: ceisictiicaccuacd cen 45 45 45 45 45 -45 50 Stocker see eatae:. vcindasrertos 75 75 75 75 75 -75 90 Polariscope Tubes, Schmidt & Haensch, Brass, nickel plated, for either screw cap or slip cap. eng th pment cere: 50 94.7 100 189.4 200 220.440 DutysEreetyasccccnce ee 2.70 2.70 2.70 2.70 2.70 2.70 — 3.00 Duty, Raids oes cance iets 3.60 3.60 3.60 3.60 3.60 3.60 4.00 Polariscope Tubes, Schmidt & Haensch, Patent Glass, with enlarged end to take air bubble, with either screw cap or slip cap. Then pth oemraeteiee etree: 50 94.7 100 —s:189.4 © 200 220. ~—- 400 Duty Pree sk conser anes: 2.70 2.70 2.70 2.70 2.70 2.70 3.00 Stock en ase cemeue ce onic 4.50 4.50 4.50 4.50 4.50 4.50 5.00 Extra Patent Glass Tubes, only for above. Hon tubes; smmseesesevrcie siete 50 94.7 100. ——:189.4 200. ~~. 220 400 Duty Freese occsecet noses -60 -60 60 -60 -60 -60 75 Stocks coer anskieseaine lee 1.00 1.00 1.00 1.00 1.00 1.00 1.25 Polariscope Tubes, Schmidt & Haensch, Inversion for filling and for thermometer, with either screw cap or slip cap. Ib FeV-anel, Wilds posgooocuscae 50 94.7 100 189.4 200 220. —_—-400 Mutyskrees sc aceenicrsnee ce 3.00 3.00 3.00 3.00 3.00 3.00 3.45 Stocksscc-eeniccr ncacceecue 5.00 5.00 5.00 5.00 5.00 5.00 5.75 Extra Glass Tubes only for above. Hor tubes;;mm nee sere _50 94.7 100 189.4 200.220 400 Duty Breer. ssc secon ere 90 90 90 90 90 90 1.05 Stocks caces secon 1.50 1.50 1.50 1.50 1.50 1.50 1.75 Polariscope Tube, Micro Tube, Fischer, Schmidt & Haensch. Tex pth Tern (27.4. 5 ct cucceveeataterereretese eter ssckatavatekereiarersesroets\ srovers 6) 3'5 (ois: 27 erzae sheep: eee 50 100 (G05 0112) (ht: A ORNS oe OM hic ncicoD Onn Acco coo RARGBAGENTcadcccon[ 0.1 0.2 1D 200 C2) Sener PE ein ee ES nor tn COO me Ree ne Meee eh ads oagan- 3.60 3.60 AD UUs 21 Cr aR a I 5 ROC Oe ERR hiss kbd owos 4.80 4.80 Polariscope Tube, Abderhalden, Schmidt & Haensch, 200 mm long, containing Duty Paid Dutyehreeseaces ht eee 7.20 434 2 ec, with water jacket. ss g/eio1a/0 210/e)= (oO See 9.60 > na | x S ve] ae =| ar OF ME JASe S GeyOx Mi Rs Ay SIN GY; Ss ee "Franz Schmidt & Maensch No. 44572 : NSCH. caret Ni ee FRANZ SGHMIDTs HAE yosusey) By }piwWyr.S zuesy oe No. 44576 FRANZ SCHMIIDTE HAENSCH BERLIN, No. 44580 No. 44588 No. 44608 44572. Polariscope Tube, Inversion, Landolt, Schmidt & Haensch, for general scientific work, of glass, with brass w ater jacket, thermometer tubulation, etc., including thermometer graduated from 10 to 32°C. in ths. Wenpoh; mms < Tee Or aR Fy. TY Hie OP Me eAr es Cy ORME ba AS aN TTT pip fof sf -all hil | ! 7 —l i ee No. 44784 44776. 44780. 44784. 44788. 44792. 44796. No. 44788 No. 44792 No. 44796 Press, Tincture, extra heavy, for making tinctures, decoctions, infusions, ete. Capacity .quantssneer sneer seem icine: . A 1 2 4 8 Each.. Rie ie orien aetna eae 5 DES be OOO IO. 3.75 4.50 6.50 10.00 Press, Taner for use w here raatenial must not be in contact with metal, exposed parts being made of porcelain-diameteriofpress|plate) Simm’... .<\. .sryrcete citeets oie seein ee ee re eee eee 17.00 Press, Laboratory, Witt, with porcelain plates, the lower one with trough and with pressing surface 150 mm square. Very heavily built to praehets ind strong pressure. Duty Ereey eee . 33.0 Duty Paidess cis: c.cep eee 40.00 Press, Sodium, Kossel, for the direct preparation of ;5 Normal solutions without weighing of the sodium. See Hoppe-Seyler, Zeitschr. f. physiologische Chemie, Bd. 33. Duty Pree. . 3 eS Se eee 21.00 Duty Paid RE Arcs diicccor 25.20 Press, Sodium, Hofmann, with separate removable cylinder for producing both wire and nibpor. With molds for wire of 4, 3, 1 and 2mm diameter and ribbon of 0.4 by 10mm.............. 7.50 Press, Laboratory, for sugar beet samples, cylinder 60 mm diameter w ith fine perforations through Bais the juice is pressed into the dish shown below. Duty hrees es eee eee 40.50 Duty Paid... 2 4-560 (eee 54.00 438 Tp ekin SU IR H. TA SHA AOR UM Ay 2S G © Wh iP AS WY PROJECTION APPARATUS No. 44820—Enlarging Outfit PROJECTION APPARATUS, BAUSCH & LOMB MODEL B BALOPTICON. This little Balopticon is a high 44800. 44804. 44808. 44812. 44813. 44820. 44824. grade stereopticon for use in small classrooms, etc. We furnish the Model B with either small arc lamp and compact rheostat or with the new 250 Watt nitrogen filled Mazda Lamp with silvered globe and concentrated filament. This new illumi- nant gives almost as brilliant a picture with lantern slides as does the are lamp on direct current circuit and quite as brilliant as the are lamp on alternating circuit. It is strongly recommended for school and home work where apparatus is to be operated by those not familiar with the manipulation of even a simple arc lamp. Both are furnished complete with connections for ready attachment to the lamp socket on any ordinary house wiring. Where electricity is not available, we furnish either an acetylene or Welsbach gas burner. If both types of illuminant are desired, we can supply the extra lamp in its lamp house for quick and easy interchange. A feature of this lantern is the special ventilation of both lamp house and condenser mount, per- putting one to use lantern slide films, if desired, without the expense and inconvenience of a water cell. Lamp House—Of sheet metal with special ventilation; two styles—one for arc lamp measuring 64 x 2} x 5 in., and that for Mazda, acetylene or Welsbach lamp measuring 6} x 7 x 5 in.; both styles fit in grooves to rear standard and can be instantly inter- changed by lifting out one and sliding in the other. Muminant—Bausch & Lomb Adjustable Baby Are Lamp with small 4}-ampere rheostat, 250-watt Mazda lamp, nitrogen filled with silvered globe, acetylene or Welsbach gas burner, as desired; carbons of are lamp can be adjusted independently and then very easily fed forward by turning a single convenient button. Projection Lens—Special achromatic lens of 10-inch focus in spiral focusing mount regularly supplied; either 8-inch or 12-inch focus lens can be furnished, by special order, without extra charge. Dimensions—Length (ready for operation), 20 in. over all, with arc, or 22 in. with other lamps; height, 93 in. Weight—Complete in case, 15 lbs. with are and rheostat, or 13 lbs. with other lamps. 4 Case—Of sheet metal, 7} x 9} x 15 in., neatly lacquered in black and provided with carrying strap. Model B Balopticon, as above described, with 250-watt Mazda lamp, cord and plug, in case, with GIRTON e Bo acing MO Ue aid Ee COCO ERC aCe DESDE CE Sonne 6 oaue Gasca Een aoa eaReo ano 22.00 Model B Balopticon, with are lamp, rheostat and switch................. Soshtyetictee cise scales 24.00 SeIMaANE es with Welsbach gas burner and connections...................-...00see00 20.00 _ ‘ a withvacecylencibUMMers oc .cs 2 ne eee ee eee nia Ne 20.00 Acetylene Tank (Prest-o-lite), charged with 10 cu. ft. of Acetylene..... : EE OD Re ees oe 10.00 po emtobde and Enlarging Outfit, for use in connection with Model B Balopticon, consisting of the following :— Two sections of metal track, each 24 in. long, to be screwed to table or baseboard. Easel board, accommodating 11x 14-in. paper either vertically or horizontally and mounted at one end of track. Supplementary track, 18 in. long, sliding on base tracks and supporting the Balopticon at suitable height to align optical axis with center of board. d Special holder with two pieces of glass to accommodate films for enlarging, up to 4x 5 in Frame to hold negatives for lantern slide making, 5x 7 in. and smaller sizes. Adapter with ground glass, attaching to rear of easel board to accommodate regular lamp house of Balopticon. Special frame, fitting in slide carrier support to take ground glass and plate holder Piece of ground glass to place between condensing lenses when are lamp is used. Cap with ruby glass to place on projection lens when placing sensitized paper on easel. Completejouthitasiapovesssecen + csiiac ceases aneice eR ee eee ee ee eer ee Ge Gna eee 18.00 Flange, for use when it is desired to use photographic lens from the camera, same to be attached to the front board of the Balopticon. Make and size of the photographic lens must be specified an OLOSLIN Gre emer tee eT eae oe Sao dba TRO Pear Seat PEO ectatem oe er ener Pa Note—For small enlargements the regular 10-inch e. f. projection objective supplied with the Model B is satisfactory. For larger work a shorter focus lens is recommended such as the 6-inch regular projection objective. 439 Aa Re al ri Uk H. pe Ee Ou IMisazAy gS CG °F SMe IRS eA INE SY No. 44828—Model C, with Small Lamp House No. 44852 —Model D, with Large Lamp House PROJECTION APPARATUS, BAUSCH & LOMB MODEL C BALOPTICON. This is the standard Balopticon for lantern slide work only and meets every requirement where lantern slides only are to be handled. The new 250 watt nitrogen filled Mazda lamp with silvered globe is recommended for use with the Model C when same is to be operated by those not familiar with the manipulation of are lamps. It gives an illumination equal to the arc lamp with small carbons on 43 amperes alternating current circuit and nearly as brilliant as same on direct current circuit. It does not equal in illumination the are lamp with the larger carbons with a current of ten to twenty-five amperes. Lamp House—Two styles, small and large, both of sheet metal, fitted with B & L special patented light-tight ventilator and provided with two observation windows; ‘small style measures 6} in. long, 11 in. high and 6 in. wide, asbestos lined; large style meas- ures 13} in. long, 14 in. high and 73 in. wide, light- tight, constructed of double walls with air space between and provided with large light-tight door on the side—conforms to most rigorous requirements of Boards of Underwriters. Illuminant—Hand-feed are lamp for direct or alternating current or new 250 watt nitrogen filled Mazda lamp with silvered globe. Projection Lens—Bausch & Lomb Standard lens with rack and pinion adjustment. Dimensions—Leneth, extended, 27 in. without lens; height, 11 or 14 in. Weight—Alone, 14 lbs.; in case, 24 Ibs. Case—Regularly furnished only with small lamp house (see foot note under price list); of metal, neatly lacquered in black meas- uring 22}x 12x7 in. and provided with carrying strap. Possible Attachments—The attachments for opaque materials, the simple microscope, the vertical attachment, and either adjust- able slit can be used successfully with this Balopticon. Special attention is called to the Model C Balopticon with large light-tight lamp house. We stron recommend the selection of this outfit since it prevents any light ‘from escaping into the room nee consequently more satisfactory in operation. A water cell, to minimize the heat passing through ais slide, can be added to any Model C at an additional cost, as indicated in the foot note below. 44828. Model C Balopticon, as above described, with small lamp house and 6-inch focus, 13 inch diameter DLOIECHONSIENSAsceccc sia aoe mente PRE ieee DSH OUON SS GGSabandadoGoS SCOR sons once 30.00 44832. Model C Balopticon, as above, and 8-inch focus, 1} inch diameter projection lens............... 30.00 44836. Model Cc Balopticon, as above, with 10-inch focus, 1} inch diameter projection lens sea eeee 30.00 “ 2 “ 57. “ 4 ieee “ “ce “ “ “ce “c eee ce or. ney “e “ «, = ee Tagg) Wega Re « « « J5inch “ Qe inch “ « at eee OD 44850. 15-inch 2,5 inch ef fs be Weston Papo tic!) Note—These outfits are not regularly supplied with cases but a special wooden case can be supplied at $4.00 extra. 440 No. 44876—Portable Model C in Case with Screen | Vihhnmene | No. 44876—Portable Model C with Tripod, Case and Acetylene Tank No. 44868—Model C Dissolving PROJECTION APPARATUS, BAUSCH & LOMB DOUBLE MODEL C FOR DISSOLVING EFFECT, with Bausch & Lomb patent iris diaphragm dissolver, which affords a perfect blending of one picture into the other. With the exception of the iris dissolver the outfits are standard Model C but when ordered to- gether are furnished with the necessary connecting pieces to rigidly join them together. 44868. Double Model C Balopticon, with 6, 8 or 10-inch focus, 13 inch diameter projection lens, as specified, MLB IRISNGISsOlven nt ecm cc norte ee sadoosapabomoSdnapsnabapooonte 75.00 44872. Double Model C Balopticon, with 10, 12 or 15-inch focus, 2,5 inch diameter projection lens, as specified, HALAS TS KGIBSOlVEL2yten,. se teers Ne ot ooh iets os Faas DR Ee ae See ee eieoe . 85.00 PROJECTION APPARATUS, BAUSCH & LOMB PORTABLE MODEL C, as widely used by members of the staff of Agricultural Experiment Stations in their field work, Farmers Institute work, ete., and as supplied by us to all of the field lecturers employed by the Rockefeller Sanitary Commission for the Eradication of the Hookworm. Lantern—Bausch & Lomb regular Model C Balopticon, fitted with 27s-inch diameter, 10-inch focus Standard projection lens and double condensing system in patent ventilated mount. IWuminant—Acetylene lamp of two-jet type with capacity of 1} cubic feet of gas per hour; fitted with special mirror reflector. Supporting Table—Consists of strong tripod, adjustable to any desired height, with connection for screwing firmly into cover of carrying case, which forms the top. Carrying Case—Of wood, measuring 294 x 13} x 8} in., covered with leatheret; cover is detachable, asbestos lined and fitted with neat metal plate into which tripod is screwed: case is carried by strong handle attached to heavy leather strap and, in addition to the regular outfit, contains space for gas tank of 10 cubic feet capacity and a second illuminant, both of which may be added at extra cost. Weight—Outfit in case, with gas tank added, 40 lbs. a Suggested Accessories—Wherever electric wiring is available, an electric illuminant, particularly the are lamp, is preferable, and it is well to be provided with one in addition to theacetylenelamp. They willbe found listed elsewhere. For those desiring a portable screen we list below a 6 x 6-foot screen of heavy material on a plain roller. It is furnished in a canvas covered case with reinforced leather ends, which is fitted with a serviceable handle for carrying with the outfit, the whole weighing but 4 lbs. . 44876. Portable Model C Balopticon, as above described..................-..-2.2---0-0. Fn 45.00 44880. i. Screen, 6 ft. square, on plain roller in canvas covered case with reinforced leather ends. 8.00 44ASSameeracety lene Gassvanke | Ocu pit eapacit yen «os shee aaeeo thoes sae ee ee eee eee 10.00 441 > vo) =| a0 G ve ae 4 x OR Ma aA COOL eIM) BE eA aN < No. 44885. Combined Balopticon in position for projection No. 44885. Combined Balopticon in pesition for projection of lantern slides of opaque objects without reversion of image PROJECTION APPARATUS, BAUSCH & LOMB COMBINED BALOPTICON, NEW MODEL, providing for lantern slide projection and projection of opaque objects with immediate interchange from one to the other. The new model differs from the earlier model of the Combined Balopticon in that it is now provided with a horizontal object holder for opaque objects which has been found in the Universal and Convertible models to be distinctly better than the vertical object holder and, further, that opaque projection is accomplished with the object on the screen in the correct position from left to right, i.e. without reversion of the image. This is accomplished by illuminating the opaque object directly from the are by placing the lamp house in the inclined position so that the image projected vertically through the opaque projection objective is reflected horizontally to the screen by the mirror over the opaque object. Lantern slides are projected with the lamp house in the horizontal position and the change from the projection of lantern slides to opaque projection, or vice versa, is accomplished by the simple shifting of the lamp house from the horizontal to the vertical position as shown in the illustra- tion. The size of the area which may be projected through the opaque projection objective is 5 x 5 inches and the object holder is so constructed that large illustrations can be shifted about to cover any desired area for projection. For convenience in handling photographic plate and post cards two carriers are supplied with adjustable frames to take cards of varying width. Base—Consisting of heavy sheet metal supports, front and rear, 8 inches wide, and carrying dark chamber at height of 9} inches. Lamp House—Measures 13} inches long, 143 inches high and 7} inches wide; light tight and freely ventilated, constructed of double sheet metal walls with an air space between the two walls and the roof, fitted with special patented ventilator; with large light tight spring door on the side and observation windows on both sides; mounted between horizontal supports at front end and provided with handle at rear, permitting it to be easily tilted for projection of opaque objects and held rigidly in position by spring arm; conforms to the most rigorous requirements of Boards of Underwriters. IlNuminant—Hand-feed are lamp for direct or alternating current. 3 3 . Condensing System—Bausen & Lomb regular triple system, with two rear lenses mounted directly in front of the lamp house in ventilated mount, giving a parallel beam of light in the dark chamber, and the front lens placed in front of the dark cham- ber immediately behind the slide carrier; diameter 44 inches. : Paha 2 x Dark Chamber—Of sheet metal, light tight, measuring 12} x 11} x 7 inches; with opening in bottom for projected objects 5 inches square; provided with hinged door and observation window on right side. é : . - Object Holder—Of square sheet metal mounted on arm controlled by two strong springs; accommodating objects of varying Fe thickness, the holder always remaining parallel to base and automatically bringing object into proper plane of projection. Slide Carrier—Double carrier with elevating device. > Post Card Carrier—Two adjustable carriers with wooden backs and frame which fit opaque object holder. i : Projection Lenses—Two of Bausch & Lomb new standard lenses with rack and pinion focusing adjustment, of such relative foci as to project images of approximately equal size from opaque objects and lantern slides; lens for opaque objects fitted with adjustable first surface mirror. : ; ; u Dimensions—Length from rear of lamp house to front of projection lens for lantern slides; height to top of mirror 33 inches. 44885. | New Combined Balopticon, as above, with 4 inch diameter, 15 inch foeus lens for opaque projection and 12 inch diameter, 10 inch focus lens for lantern slide projection; without rheostat... 120.00 44886. | New Combined Balopticon, as above, but with 18 inch focus lens for opaque projection and 12 inch . focus) lens for lantern’slidesprojectionlss--c..-----4-- 3 ----- = 22 -= eo Beane WSS - 120.00 442 No. 44888—Universal Balopticon No. 44892— Universal Balopticon With Vertical Attachment No. 44888 in Position for Opaque Projection No. 44892 With Projection Microscope PROJECTION APPARATUS, BAUSCH & LOMB UNIVERSAL BALOPTICON, New Model, providing for lan- tern slide projection, opaque object projection by reflected light. from an area 6x6 inches, micro projection, and projection of objects in a horizontal position by transmitted light with the use of verti- cal attachment. The interchange from lantern slide projection to projection of opaque objects is instantaneous without taking down or building up any part of the apparatus. With the vertical attachment in position the change is made instantly from opaque projection to either vertical or lantern slide projection. When the projection microscope is in position the change from micro projection to either lantern slide, vertical projection or opaque is instantaneous. Base—Of cast iron, 25 in. in length; carried at height of 7 in. from table by two cast iron supports of 11-in. spread with elevating screws front and rear. Lamp House—Measures 13} in. long, 13} in. high and 7} in. wide, light-tight and freely ventilated, constructed of double sheet metal walls, with an air space between the two walls and the roof fitted with B. & L. special patented ventilator; provided with large, light-tight spring door on the side and observation windows on both sides; mounted between uprights at front end and provided with handle at rear, permitting it to be easily tilted for opaque projection and held rigidly in position by strong spring arm; conforms to the most rigorous requirements of Boards of Underwriters. Illuminant—Hand-feed are lamp for direct or alternating current. Condensing System—Consists of two rear lenses of B & L triple system, 6-in. diameter, in ventilated mount directly in front of lamp house, rendering light approximately parallel in dark chamber, and a plano-convex lens placed in front of the mirror box for lantern slide work, completing triple system. Object Holder—Round, of heavy metal, mounted on double arm with spring hinge at each end and handle at holder end; the whole adjustable for height on a grooved vertical standard and provided with set screw; will accommodate objects of widely varying thickness and size, the holder always remaining parallel to base and automatically bringing object into proper plane of projection; dark curtain in front of opening prevents light from. flooding room when object is being changed. Mirror Box—Of sheet metal, prism shape and light-tight; mounted over opening in top of dark chamber and containing stationary mirror at suitable angle to reflect beam of light through lantern slide. Projection Lenses—Two Bausch & Lomb Standard lenses with rack and pinion focusing adjustment, that for lantern slides regu- larly of 8-inch focus, 1{-in. diameter, and that for opaque work of 15-inch focus, 4-in. diameter; lenses of other foci may be substituted if so specified. Dimensions—Length over all, 38 in.; height, 24 in. Vertical Equipment—Regularly furnished with Universal Balopticon No. 34892 only, but can be ordered separately and easily added to No. 34888; consists of a rectangular metal plate, 6} x 12 in., with circular opening at either end; over one end is mounted a plano-convex condensing lens with plane side up. to complete triple condensing system for vertical projection and pro- vide stage upon which to work; upright grooved standard near opening carries 10-in. focus, 1§-in. diameter projection lens and mirror for vertical work; over other opening provision is made for mounting mirror box with lantern slide equipment; for quick transformation from one form of projection to the other entire plate slides on metal rods and is operated by con- venient handle. Possible Attachments—The medium microscope, or large microscope, and any standard moving picture attachment can be used successfully with this Balopticon. Price List on following page. 443 PX a A ely AG IR H. re JO Ma Ag aS CG. Or IM! abr VAS Nie Universal Balopticon (Continued) 44888. Universal Balopticon, as described above, with 15-inch focus, 4-inch diameter lens for opaque objects and 8-inch focus, 13-inch diameter lens for lantern slides, without vertical equipment..... 160.00 44892. Universal Balopticon, as above, but with: vertical attachmentiire. eccrine ncierte 175.00 44896. s fe %: “18-inch focus, 4-inch diameter lens for opaque objects and 10-inch focus, 13-inch diameter lens for lantern slides. 2.)-1).-- «cee eens cee eee 160.00 44900. Universal Balopticon, as above, with vertical attachment.................-ceccsccentessersccs 175.00 44904. Vertical Equipment, only, with mounting for attachment to dark chamber of No. 34888......... 15.00 44908. Optical Bench, carefully planed, 15 inches long, for attaching to the front end of the base of Universal Balopticon to accommodate projection microscope............0.0eceeececeeeeceececureeees 5.00 PROJECTION APPARATUS, BAUSCH & LOMB CONVERTIBLE, New Model, providing for lantern slide projection, projection of opaque objects by reflected light from an area 8x8 inches, micro projec- tion, projection of large and transparent objects, such as liquids or X-ray plates from a horizontal position, polariscope projection, micro-polariscope projection, spectroscope projection, etc. In opaque projection diaphragms are supplied reducing the area projected to 6 inches square and 4 inches square. The use of these permits the withdrawal of the are from the condenser systems, thus providing increased illumination, etc. Base—Cast iron frame of rectangular shape, 13 in. wide, with rigid supports at either end carrying dark chamber and optical bed at height of 10 in. Optical Bed—Of lathe type, carefully planed, accommodating supports for attachments which may be adjusted as desired and rigidly clamped; length of optical bed proper, 22 in.; entire bed, including space occupied by dark chamber, 42 in. long, affording wide range of applicability. Lamp House—Measures 13} in. long, 13} in. high and 7} in. wide; light-tight and freely ventilated, constructed of double sheet metal walls, with an air space between the two walls and the roof fitted with Bausch & Lomb special patented ventilator; provided with large, light-tight spring door on the side and observation windows on both sides; mounted between uprights at front end and provided with handle at rear, permitting it to be easily tilted for opaque projection and held rigidly in position by strong spring arm; conforms to the most rigorous requirements of Boards of Underwriters. {iluminant—Hand-feed are lamp for direct or alternating current, connected by two feed wires to a switch attached to rear of base and provided with magnetic coils to minimize ‘‘blowing.”’ Condensing System—Bausch & Lomb regular triple system, with the two rear lenses of 6 and 8-inch diameter mounted directly in front of the lamp house in special ventilated mount, giving a parallel beam of light in the dark chamber, and the front lens of 44-inch diameter placed in front of the dark chamber immediately. behind the slide carrier. Dark Chamber—Of metal, light-tight, measuring 17x 11x 8 in.; with opening in bottom for projected objects, 8 in. square, and metal diaphragms to give 6-in. square or 4-in. square opening, as desired; provided with hinged door and observation window on Tight side; contains movable mirror so mounted as to prevent flooding screen with light in changing from one form of projection to another—also small condensing lens in sw inging mount for use in high power microscopic projection. Object Holder—Square, of heavy metal, mounted on double arm with spring hinge at each end and handle at holder end; the whole adjustable for height on a grooved standard and provided with set screw; will accommodate objects of widely varying thickness and size, the holder always remaining parallel to base and automatically bringing object into proper plane of projection; curtain at front of base prevents light from flooding room when object is being changed, while sliding velvet curtains on either side screen light when large objects are in place. Projection Lenses—Standard or Tessar, “according to the outfit ordered; one for lantern slides and one for opaque projection, the latter provided with large first ‘surface, adjustable reversing mirror. Dimensions—Length, back of lamp house to front end of bed, 53 in.; height, 27 in. to top of lens for opaque projection. Microscope Attachment—Consists of Large Projection Microscope, including amplifier, new projection eyepiece, substage water cell, three substage condensers, triple revolving nosepiece and three diaphragms for use in slide carrier; mounted on swinging arm which attaches to optical bed. ~ Vertical Attachment—Consists of dark chamber, 8 x 5} x 5 in., with movable mirror which can be set to direct light through 4-in. diameter plano-convex condensing lens i in horizontal mounting over opening in top of chamber; 11-in., upright optical bed on top of chamber carries two standards supporting bellows and 10-in. focus, 1{-in. diameter projection lens with adjust- ae reversing mirror; is also supplied for holding microscope in vertical position, in which case a reversing prism is include Combined Polariscope and Vertical Attachment—Consists of Vertical Attachment complete, as described above, with a Delezenne poem which fits over the opening in top of dark chamber and has two rotating quarter-wave mica plates in front; 11 in. orizontal optical bed clamps readily to tront of chamber and carries polariscope parts, consisting of strongly convergent and divergent lenses, mounted in connection with a 95-mm diameter revolving stage, a 4-in. focus objective and a revoly- able Nicol prism as analyzer, the objective and analyzer being mounted for focusing by a rack and pinion adjustment. Special Vertical Attachment—Consists of a dark chamber, 9} x 8} x 8} in., with an 8-in. diameter plano-convex condensing lens in horizontal mounting over opening in top, surrounded by cloth-covered platform 14 x 12 in.; upright standard, 12 in. high, carries 15-in. focus, -in. diameter projection lens with first surface, adjustable reversing mirror, the whole being mounted on swinging arm which permits it to be swung out of path of light for opaque projection. We particularly recommend the Convertible Balopticon with large Projection Microscope where pro- jection with the higher powers is to be accomplished and w here immediate interchange from micro projection to either lantern slide or opaque objects is desirable. The special vertical attachment provided with this outfit is the best method available for the projecting of X-ray plates, large histo- logical subjects, such as of the brain, and other transparencies, without reducing them to ordinary lantern slides as this special attachment provides for the projection of areas up to8 inches in diameter. 44912. Convertible Balopticon, complete for projection of lantern slides and opaque objects, with 15-inch focus, 4-inch diameter lens for opaque objects and 8-inch focus, 13-inch diameter lens for lan- ern (SLIde@S 5.2 ora. Sa ease cee ate eh area ele jin erbncoelslana defen aisle te eee ee EEE eee 250.00 44916. Convertible Balopticon, same as above, but with 18-inch focus 4-inch diameter lens for opaque objects and 10-inch focus, 13-inch diameter lens for lantern slides....................+e-csseceees 250.00 44920. Convertible Balopticon, same as above, but with 15?-inch focus, 35-inch diameter Tessar Ic lens for opaque objects and 8-inch focus, 1s inch diameter Standard lens for lantern slides.......... 430.00 44924. Set of Accessories for projection of 4.x 5 or 5x7 transparencies, consisting of special slide carrier sup- port, double slide carrier, 8-inch diameter, 15-inch focus plano-convex condensing lens, tapering bellows and front standard, without projection lens...............2.c0..+e+c++s see eee 30.00 Illustrations of Convertible on following page. 444 Se ee SS wT No. 44912. Convertible with Large Projection Microscope on Swinging Mount Providing Immediate Interchange with Lantern Slide Objective No. 44912. Convertible for Opaque and Lantern Slide Projection No. 44912 with Lamp House Tilted for Opaque Projection by Direct Illumination —— | | - | | } : Z | =) lars — = s\e= 4} ben A . hae i= Pl ~ = 7 i; ——_ x Ales c\ cH ; 5} ng LY Q\ cf Bn 7 aa IN | sf Yip ral ~ ° “ ° ~ a i l} o No. 44912. Optical Scheme, showing Path of Light in both Lantern Slide No. 44912. Optical Scheme, showing Path of Light in Opaque Pros Projection and Opaque Projection with Direct Reading Text jection by Direct Illumination, i.e., with Reversed Text No. 44932 No. 44952 No. 44956 No. 44964 Bausch & Lomb manufacture three different models of Projection Microscopes—the Simple, Medium and Large—designed for use with their different Balopticons. The Simple Microscope has no eyepiece and is de- signed for work with low power objectives, particularly with their Model C Balopticon. ‘he other two models are compound microscopes with both coarse and fine adjustments and high grade equipments. The Medium is illustrated with Universal Balopticon on page 442, and the Large with the Convertible Balopticon on page 444. 44928. 44932. 44936. 44940. 44944, 44948. 44952. 44956. 44960. 44964. 44968. 44972. Simple Microscope, including substage condenser and three diaphragms for use in slide carrier... 15.00 Medium Microscope, including projection eyepiece, substage condenser and three diaphragms for use /injslide carrier; withoutiobjectives:...-.-.--+---+cuscsuieameeen eneaeeeene: tee eee neneee 37.50 Medium Microscope, mounted on swinging arm for Model D or Convertible Balopticons........ 45.00 se mounted on special swinging arm for Universal Balopticon...............; 45.00 Large Microscope, including amplifier, projection eyepiece, substage water cell, three substage con- densers, triple revolving nosepiece and three diaphragms for use in slide carrier; mounted on swinging arm, without projection lens or objectives...............0ce.eseeeseeeeee esse 100.00 Large Microscope, as above, but with 32, 16 and 8 mm objectives added........................ 117.00 VerticalAttachment for Mode) © Balopticon. «.......0..- «+ se-cece soe coer ee Eee 10.00 Vertical Attachment for Model D or Convertible Balopticon, with prism shaped mirror box and sta- ELON AT Y MUOINT OT: We sp peesgaras sis alan aches w ovoyalarass tikv stares tava arash cassave clare gree Sloe oe Et Oe 15.00 Vertical Attachment for Convertible Balopticon or Model D, with rectangular dark chamber and moy- _ able mirror permitting interchange with other forms of projection..............-.. Saboos 4 Vertical Attachment as described above, but with front standard, bellows and 13-inch diameter pro- HOChOnWleENg.5 ahs Sheslercis co cieye cio a Sel ieee ots Dale ioesiondicie teen ne SLE Ce oad Vertical Attachment, with reversing prism for use with microscope..............20.eee0eeeeees 37.50 Extra Kront Standard for Convertible Balopticon.... 5.5... 4. ..0..- oo. nese 3.00 Note—When the vertical attachment remains in a permanent position on the Convertible Balopticon, it is well to have an extra front standard, so that one may be used on the horizontal and the other on the vertical bed. 446 44976. 44980. 44984. 44988. 44992. 44996. 45000. 45004. 45008. 45012. 45016. 45020. 45024. 45028. 45032. 45036. 45040. No. 44976 No. 44984 Hand teed rArcs vamp wit hcenverinziSUpDORus eer er Ee ene acer seen eo eee eee Eee EEE e 10.00 Incandescent Electric Lamp, 250 watt nitrogen filled, with silvered globe, on support with 10-foot ex- tensionicable and Hubbelsconnection pluginy.-cseseeerccoa-ee one teen teen 10.00 Oxyhydrorenil amp ontslippont sence aococe cea cron oe eee en nyse ee EEE eee 10.00 Acetylene Lamp with reflector and 6 feet of rubber tubing....................00c0ceeceececeees 8.00 Welsbach GasiLampiwithwe onnectlon's...\s.s/aec/s seer eee ee Eee coe 4.00 Acetylene;Gasplank el Orcubicart CADACILY 4c. se ceeee ee sie seis Sone ee eee oe 10.00 Plano-Convex Lens, 4-inch diameter, 63-inch focus; rear lens of the regular Model C system, un- PAG UTAUES Be men rete serc isis Corea Ee RSA TREES rd.0 See UE ee: aunt oa duadoubele Pe Plano-Convex Lens, 4,5;-inch diameter; front lens of the regular Model C system, unmounted. Please State oaus Ofproyections lens wihenvond ering so gira eee nen Se eee en een ies = 1.50 Plano-Convex Lens, 4}3-inch diameter, 10-inch focus; middle lens of regular Model D system, or for Specialicondensin pusy stern tr, Memes iain ores oe nie eee eet ee eee neon 1.50 Meniscus Convex Lens, 4-inch diameter, 11}-inch focus; for Model D system, or for special system 2.50 Plano-Convex Lens, 4}3-inch diameter; front lens of the regular Model D, Universal or Convertible systems, unmounted. Please state focus of projection lens when ordering............--.- 1.50 Meniscus Convex Lens, 53-inch diameter, 11}-inch focus; for Universal Balopticon, unmounted.. 6.00 Plano-Convex Lens, 6-inch diameter, 10-inch focus; for Universal Balopticon, unmounted........ 3.00 Meniscus Convex Lens, 6-inch diameter, 11}-inch focus; for Convertible Balopticon, unmounted.. 7.00 Double Convex Lens, 73-inch diameter, 11-inch focus; for Convertible Balopticon, unmounted... 10.00 Special Condenser System for opaque projection, in the Bausch & Lomb patented ventilated mount: for use in place of the regular double system when using the opaque attachment........... 5.00 Projection Lenses, Bausch & Lomb Standard. Wesienationeacmeye ore sees ve te 6” i? 8" st aK! 12” 15” 18” 20" 15” Size of mounting. - 4... 5........% ri ry i + 4 4 3 3 $ Diameter; inches. /....<0......+ ; 5 13 13 13 Ts 275 Qs 235 2y5 4 LOE Osco o pier tee ea Roo ei ceteiea Rome 7.00 7.00 7.00 7.00 14.50 14.50 14.50 18.00 18.00 50.00 Projection Table for Lantern Slides (2{x 3 inch opening) giving size of picture with objectives of various focus at different distances from the screen. Distance from lantern to screen Lens Designation in Terms of Focus 20 ft. 30 ft. 40 ft. 50 ft. 60 ft. 70 ft. 80 ft. 90 ft. 100 ft. 6-inch 10 15 20 7-inch 8} 12} 17 21 8-inch 7} il 15 183 22 10-inch 6 9 12 15 18 21 24 12-inch 5 74 10 12} 15 17} 20 223 15-inch 4 6 8 10 12 14 16 18 20 18-inch 63 8 10 14 13 15 164 20-inch 6 7 9 103 12 134 15 Example: Using a 12-inch lens at a distance of 40 ft. from the screen, the longest side of the screen image will measure 10 ft. Projection Table for Opaque Objects, giving size of picture with objectives of various focus at different distances from the screen. | 44 x5 inch Opening 6x 6 inch Opening 8x8 inch Opening | Distance from Lens a 32 : : See AS | to screen { | 12” lens 15"lens —_25’’ lens 15” lens 18” Jens 15” lens 18” lens | |- =e= — EE ¥ = _ : = = 15 ft. 6 43 54 | 4} (3 6 20 ft. 8 6 7h 6 10 | 8 | 25 ft. 10 8 94 8 13 103 30 ft. 12 94 54 14 9} 35 ft. 11 64 11 40 ft. 13 7 | 50 ft. 94 | 60 ft. 11 Example: An 18-inch lens used ata distance of. 20 ft. from the screen will project an image 8 ft. square. 447 45076. 45080. 45084. 45088. 45092. 45096. 45100. 45104. 45108. 45112. 45116. 45120. 45124. 45128. 45132. 45136. 15140. 45144. 45148. 45152. 45156. 45160. No. 45056 No. 45060 Projection Stand, of metal; top 30x 14 inches. 22.2.0. se cf cic stoic ele ole eee efecto ee 10.00 as above, with shelf for accessories... . 222. sie cso « elie eel etree ee 12.00 ss “> withi wooden! top, 32x 16} imChes®..6 sees cic we ceie ele eiealeieio lea oie eet 16.00 ss «« as above, with revolving wooden top...........----+ +s. sees cece ees tenet ees 20.00 y “with strong cast iron base and frame and heavy 40 x 17 inch revolving wooden top, with space beneath for adding cabinet, if desired, provided with castors and leveling screws 32.50 Projection Stand, as above, without revolving top..............cceececcee cece ecteeeesseeeees 25.00 Screens, of heavy material with special white coating, mounted on spring roller. Sizewleetacccncn er cits eee 6x6 leXall, 8x8 9x9 8x 10 10x 10 12x12 Bacay ete es i eee 4.00 6.00 7.20 12.00 13.50 15.00 20.00 Screens, Aluminum, of heavy material with metallic surface. These screens give much more brilliant images when angle including observers is not over 60°. Sizes feet: 5.2. ee sc.ccisels vies oes 6x6 (sti 8x8 9x9 10x10 i12x12 BG OS DRED OCT eoe 10.00 14.00 18.00 22.00 28.00 40.00 Screen, Aluminum, Zeiss. This screen is stretched taut on rigid metallic frame and results obtained in both micro and opaque projection are very superior to those with any other form of alumi- num coated screen. Size 1.5 meter square. Duty Bree sc. secs: seis = 30.00 Duty Paid...... RNa acs SoS oc 39.50 Rheostat, Fixed Form, 15 amperes, 110 volts.. sis oboe ae eee J33.s3 aston ae eee 7.00 «15 amperes, 220 volts... wade esiee te See eee 18.00 ss SS a Slamperes; lOkVOlts! oc 2. e.4- sec ies oo eee sila ee 5.00 i « 5 amperes, 220 volts..... siete dita 2.a@0e aes ee See ee 7.00 s « é 5 amperes, 110 and 220 VOItS:,. S- nc. sai eristans ar skiee eee oe 8.00 Rheostat, Adjustable Form, 15 to 25 amperes, 110 VOItS.-.6. os cave wares se ouaee eee 18.00 {9S 15;to-25 amperes, 220 Voltss.. «ccc sees eects sce Ce eee 25.00 ss “s 15 to 35 amperes, 110 volts...... ences © oss, ei OO Hart Standard Double Pole Snap Switch, for 35 amperes on circuits up to 250 volts.............. 1.50 Air Brake Lever Knife Switch, front connected; single throw, double pole......................- 2.00 Switch as above, but double throw, double pole. . ‘ Sep mmr osenscoscec 7 =~ eT Approved Cartridge Fuses for 30 amperes. Each. : BRIE Cocoa cocs. 25 Approved Cartridge Fuses for 40 amperes. Bach..............2--.:..5+2+s0++sesesee ==> eee 45 Rubber Covered Twin Cable with No. 12 copper wire for 15 amperes, per foot|...2: 25 --eaeee eel O Rubber Covered Twin Cable with No. 10 copper wire for 25 amperes, per foot..................- -10 Rubber Covered Twin Cable with No. 8 copper wire for 35 amperes, per foot..................-- 12} Cored Carbons, 18 mm diameter, 6 inches long, per 100 ss eee aes hele eee 4.50 a aes 6 ; je esed voigncheh es eee eae 3.00 ss G i “ Gales S mG, Bea : bs soe s cae Bye ecco ae ese s ss Sas = Glens ao OO gk w cidsae Sieainse Si eS 5,+ COR ee 2.00 - § 6:5 is Oe < i Sa EMME MECr Mason scccc orcs 7: 2.00 448 > ) C| = S v9) tae sO) 3M) FAS ss Ce RO! IM) SP FA. SIN ~< PYROMETERS We are not manufacturers of Pyrometers and are not equipped to design or make installations of Pyrometers for special purposes, as such service in every instance is better performed by the original manufacturers. It is our custom to refer inquiries involving special designs to the maker who, in our opinion, is best qualified to meet the requirements of the case. We are prepared, however, to furnish standard equipments, for both labora- tory and works practice, from reliable makers of each type of Pyrometer and always at original factory prices. As a convenience to users of this catalogue we print the following fixed points of the provisional temperature scale now in use at the Bureau of Standards, Washington, D.C. (Circular No.7, ‘‘Pyrometer Testing and Heat Measurements’’). Freezing or Melting Points SUE RR crate eletetetetyetastotetateiaretometntetstafetei-teleicieteicteraielkicieletsinie'«) stairs 232° C. 450° F. (ALG Ss asccnponontocsuonoocbnocsoacionasee 1063° C. 1945° F. Cadmiltameeacen ceca cceecieine ie lonisieeiatelslalesicie.ae is S21'C G10 Ey aCopperiens. seri eie lenin ee .. 1083°C. 1981° F. IC ho soodenooc coodnpodsssapnaooapooDeoddesadGoE S27aCon 621o Ke Nickelecce eer Noceectiseria a= 1450° C. 2642° F. Zine...... 419°C. 786° F. Palladium. 1550° C, 2822°F. Antimony. . 630° C. 1166° F. Platinum... 1755° C. 3190° F. Aluminum. -- 658°C. 1216°F. Alumina. . 2050° C. 3720° F. NOG eccagonoodos scipoconeedodsodsoosusescenoeuse 779°C. 1434° F. Tungsten... 3000° C. 5430° F. CIC thu dcobre secoccadeccneocdne ser ane saneareEcoane 961°C. 1762°F. INET Os jc 3063 ice bce ROS dO OHRB SAC OODOGES CDACRBE ARNE BDOSEEaceEaSenoesoCS cose aasocaaSprocoMaeneBbncctidG 217°, 9 + 0.058 (H — 760) Benzophenone . 305°, 9 + 0.063 (H — 760) Sulphur Sobiogso4 59000005 SAO ONOUT AEM DonECOSIOC co adsoDOOoUd EAs aDooUroNchObUdAadacoTdscoUD OOO UdotAen aa 106 444°, 6 + 0.090 (H — 760) TYPES OF PYROMETERS EXPANSION PYROMETERS, suitable for measurements up to about 1400°F. These are based on the relative expansion of metals or of a metal and graphite, and are widely used in industrial establishments. Such instruments should be tested from time to time to correct for changes in zero. THERMO-ELECTRIC PYROMETERS. In pyrometers of this type temperatures are measured by the magnitude of the electromotive forces set up between wires of different materials when one junction is exposed to the temperature to be measured and the other junction (or junctions) is kept ac some known temperature. For the measurement of temperatures in the interval 300° to 1600°C. thermocouples consisting of a wire of an iridium or rhodium alloy of platinum joined to a wire of pure platinum (usually designated as rare metal couples) are generally used. The most commonly used type, known as the Le Chatelier pyrometer, consists of a wire of 10% rho- dium alloy with platinum joined to one of pure platinum. For the measurement of temperatures below 600°C. to that of liquid air (—200° C.) couples, known as the base metal couples, of iron-constantan, copper-constantan, etc., are used, as are also couples of iron, chromium, nickel, etc., and their alloys. These couples are more subject to oxidation than the platinum alloys and must be renewed more frequently. ELECTRICAL RESISTANCE THERMOMETERS. The fundamental principle of the Resistance Thermometer is the fact that a change in the temperature of a pure metal causes a definite change in its resistance to an electrical current. The percentage change in re- sistance per degree change in temperature is more than twenty as great as the percentage change in the volume of mercury with tem- perature. The method of measurement employed is the Wheatstone Bridge in one or other of its forms. The bridge, instead of being calibrated in ohms, is calibrated in terms of temperature and is, therefore, direct reading in temperature units. This direct reading feature is made possible in the Leeds & Northrup product by a special method of adjustment which assures that, no matter how the purity of the metal may vary, all bulbs of a given class have not only the same resistance at a given temperature but also have the aame tate of change of 1esistance with temperature. The merits of Resistance Thermometers and Pyrometers group themselves under the two headings of reliability and flexibility. There is no method of temperature measurements as flexible as the resistance thermometer. Not only may the bulb be made so small that its total volume need not exceed a cubic quarter inch, but this requisite volume may be of any desired form, flat or round, stiff or flexible. On the other hand, the bulb may integrate the temperature over as great an area as desired either as a large single unit or as a subdivided unit. Further, considering the equipment as a whole, the system is most flexible; any number of the various bulbs of a given class may be read on one indicator with any length or size of leads, and a system already installed may be increased at will by additional bulbs and additional switching facilities. In other words, all parts are electrically inter- changeable. Further than this, the thermometer may be made, if so desired, in such form as to be practically free from thermometric lag; it may have a wide range at all points of which it is equally accurate, or it may have a short range selected for special work, giving an open scale of high accuracy. In short, throughout the range of temperature extending from the lowest known up to 1800°F, a re- sistance thermometer system may be laid out to have almost any desired characteristics. OPTICAL PYROMETERS. In optical pyrometers the intensity of the light emitted by an incandescent body whose temperature is sought is measured by comparing the intensity of the light which the body emits with that emitted by some standard source, such as a gaso- line lamp or an incandescent lamp under specified conditions. Optical pyrometers are, therefore, essentially in principle photometers adapted to meet the varying requirements of shop and laboratory use. In these pyrometers light of a single color is generally used to get rid of the difficulties in photometry incident to color differences and also for the reason that the laws connecting the temperature of a body and the intensity of the light emitted are simpler if we deal with a single wave length (color) only. RADIATION PYROMETERS. In radiation pyrometers the energy of total radiation (i.e. that associated with the long waves which do not affect the eyes, az well as the energy of the short light waves) is measured in various wavs by the heat effect which it produces, such as by the electric current set up when the radiation heats one or more junctions of two dissimilar metals, the expansion produced by the heating of a compound metal strip, and the change in resistance of a very fine metal ribbon. All of the above types of Pyrometers are furnished with recording as well as indicating instruments, with the exception of the Optical and Expansion Pyrometers. The descriptions given in the preceeding paragraphs are mostly taken from the Bureau of Standards Circular No. 7, ‘‘Pyrometer Testing and Heat Measurements.’’” We offer reliable instruments of the types mentioned on the following pages. 449 No. 45200 Horizontal Stem ‘Des No. 45204 BROWN ELECTRIC RECORDER THE BROWN INSTRUMENT CO. (eS Fal PHILADELPHIA, PA = ‘(i= = ¥ No. 45200 Vertical Stem No. 45216 No. 45220 No. 45224 No. 45228 No. 45212 45200. 45204. 45208. 45212. 45216. 45220. 45228. Pyrometer, Expansion, Brown, with new patent improvement by which the pyrometer shows exactly the same temperature no matter how much of the stem or tube above 12 inches is inserted in the heat. With new non-tarnishing porcelain dial 63 inches in diameter and with standard length of stem of 36 inches intended for 12 inches insertion in the heat. These instruments are furnished with either vertical or horizontal stem and with Centigrade or Fahrenheit dial as specified, with- out additional charge. With dial graduated to............. oso SO0S BS 812002 tS O One he LORY YU Berorecias Saint etree rere eect ER et eee repre Serer eee his Eee ... 12.00 15.00 20.00 Pyrometer, Thermo-electric, Brown Stationary Type, with round p attern, large size millivoltmeter, graduated in Fahrenheit or Centigrade degrees, with base metal thermo-couple, for occasional use up to 2400° F. but for constant use at not over 1800° F. Complete with 36 inch thermo- couple in protecting case, as shown in illustration, and 50 ft. of double conducting wire. ... 50.00 Pyrometer, Thermo-electric, Brown Portable Type, similar to above but with galvanometer in port- able case. The thermo-couple is usually supplied, as in illustration, with a protecting cap which is removed for instantly measuring temperatures up to 2400° F., or which can be left in position for permanent installation at temperature s up to 1800° F. For molten metals a special form of thermo-couple is furnished. Complete with scale graduated from 0-2400° F., with base metal thermo-couple:and 15'ft. of flexible-wires..........20-ceeve one nate se eee eee 50.00 Pyrometer, Thermo-electric, Brown Recording Type, wall form for permanent installation, making a perfect ink record on a daily chart with eight day clock mechanism. The instrument is fur- nished at the same price in portable type for horizontal use on the laboratory table. Range of temperature the same as in preceding instruments. Complete with base metal thermo-couple andl OOMts oftled ds sas mis Seo esatocenaia o 2s cto iow cae ea PA ee ae ce eee eee 100.00 Note—Galvanometers are furnished with temperature scale in Fahrenheit or Centigrade degrees at the same price; with both Fahrenheit and Centigrade scales or with temperature and millivolt scales at $5.00 additional. Accessories for Brown Thermo- electric Pyrometers. Thermocouples, Base Metal, in standard lengths of 36 inches, complete with mount. Each....... 7.50 Platinum Rhodium, in Marquardt porcelain or quartz protecting tubes as shown in illustration. For reading temperatures up to 3000° F. With iron head, porcelain block and binding posts, complete. Length, inches 12 18 24 27 33 36 39 50 60 LEY) Uae Ace det ae coed Gos ae MOEA GSAT 22.00 30.00 35.00 38.00 42.00 45.00 47.00 55.00 65.00 Marquardt Porcelain Tubes, with metal caps, for thermocouples; to withstand a temperature of 3600° F. and with a glaze impervious to gases, but which must always be heated up slowly in order to avoid breakage. Length, inches.. Seite ls sree 12 18 27 39 BACH yates ress ne ern ns Ghee oitiotaicierctel esis erie oi lsios coerebeieGe ore 3.00 4.00 6.00 8.00 Quartz Pyrometer Tubes, with metal caps, for thermocouples, which may be inserted while cold into a high temperature without cracking and they have a wide application because of this feature. Howe ever, they are not suitable for temperatures above 2500° F. and are not as durable as Mar- quardt tubes for permanent installations. Length, inches. 12 18 27 39 Bache: 2inGcse eee Cee ae eee eens eee 3.00 3.50 4.50 6.00 45232. 45233. 45234. 45235. 45236. 45237. 45238. 45239. 45240. 45241. No. 45232—Galvanometer No. 45232—Heraeus Element with Tubes, ete. Pyrometer, Thermo-electric, Le Chatelier, with Heraeus Element for temperatures up to 1600° C. with Heraeus platinum rhodium element 60 inches long mounted in double 50 inch porcelain tubes, and with latest type Siemens & Halske pivot type galvanometer, in carrying case... 163.05 Galvanometer, Siemens and Halske pivot or suspension type, without case..................-- 75.00 Carryingicase) foriabOwe sac. sncyaseieare nna siolh oe a era eela ne ose Gee es eee Wlaahisrep crake steric ahershetorsioy 7.50 Heraeus Hlement, G0hinches/long; bare. cs. serie re eit cn ote ene eee eee A ese eects east 66.00 Porcelain Tubes, 50 inches long, for Heraeus Element, per pair..... 20a Nerenl vse a abe aPouefecereite ee 15.00 Heraeus Element, 30 inches long, bare....................020+-++:- slefocsreveu nigel arsls ‘eiscei siete 36.50 Porcelain Tubes, 22 inches long, for above Heraeus Element, per pair.........................- 10.00 Heraeus Hlement 1 8iinches lon e.. bares o< :cstis ccc ase nee ote aioee ore creer errno Sleteie sch) siete 23.00 Porcelain Tubes, 12 inches long, for above Heraeus Element, per palr................eee.eeeeee 5.00 Recording Galvanometer, Siemens & Halske Pivot type, for use with any of the above Heraeus Elements as a Recording Pyrometer..................-. Search one SCAG 0.80 TORSO UBS 180.00 == gm SSS iz aN zz MORTHRUP CO- THE LEEDS OPA, No. 45242 POTENTIOMETER INDICATOR (THERMOCOUPLE POTENTIOMETER) Leeds & Northrup, a new Precision Instrument for use with Thermocouples and which greatly increases the range of their usefulness in both laboratory and shop practice. The instrument is based upon the potentiometer principle, so simplified in design as to be used by an ordinary workman. Some of the essential facts and advan- tages of this Indicator are as follows :— The potentiometer indicator when calibrated in terms of millivolts may be used accurately with any thermocouple, regardless of its length, cross-section, or materials, or the length of its leads. Many kinds of base metal thermocouples retain their calibration four or five times as long with this indicator as with a millivoltmeter. It is completely portable and requires no levelling. It has a scale 16 inches long—at least twice as long as the usual millivoltmeter; this means at least twice the accuracy in reading. The thermocouples may, if desired, be long enough to have their cold ends located at the switch- board, thus having an equipment with one cold end. The cold end temperature may be compensated for in the instrument. 451 PN AS ae dal eh ASS H. i Ie 30 IM TASS CG: SO EMaaE PACSENUaeY ‘THE LEEDS RRORTHRUP Co. PHILADELPHIA, TO THERMOCOUPLE sc TC No. 45250—Potentiometer Indicator No. 45250—Electrical Scheme The illustration of No. 45250 gives a view of the Indicator looking down on the face of theinstrument. The regular routine reading is taken by depressing the key marked TC and by turning the handle which projects from the rubber plate, bringing the galvanometer toa balance. The reading is given by the scale under the index. At intervals of say six hours, the keyed handle shown in the top of the box in the illustration should be inserted in the key ways at the side of the box, as shown in the illustration of No. 45250. The button SC should be depressed and the galvanometer brought to a balance by turning the keyed handle. This handle is keyed so that it may be removed to prevent tampering with the setting. In course of time the dry cell of the equipment will become exhausted. At this time it will be impossible to secure a balance when the key SC is depressed. The dry cell used in the indicator is a No. 4 Columbia. To replace the dry cell turn the indicator upside down and remove the panel in the bottom of the case. The dry cell may now be changed, taking care to connect the new cell with its polarity the same as the old. For instru- ments which are to be permanently located at one point, we would recommend the use of an external battery consisting of two large dry cells (as Columbia No. 6) in parallel. No. 45250 Indicator is provided with an auxiliary cold end adjustment, which, in effect, makes the instru- ment direct reading. This appears in the illustration as the small index and short scale lying just below the main scale. The small scale is set on its index at a point corresponding to the cold end temperature, and the readings of the instrument are then right without cold end correction. The Potentiometer Indicator measures by balancing against the electromotive force to be measured a con- tinuously variable known electromotive force. When the two are equal, the measurement is complete. The operation of reading, as described above, consists of balancing the electromotive force of the thermocouple against the fall in potential caused by the current flowing from the dry cell through any portion DG of the slide wire DE (see diagram). Since the dry cell is not constant, the adjusting rheostats RR’, are provided to maintain the current constant. By varying RR’ the current flowing is adjusted until the drop between C and D is just equal to the standard cell voltage. It is this operation which is performed when adjustment is made with re- movable handle. Particular attention is drawn to the fact that the Indicator may be used with any thermo- couple if the scale is in millivolts asit is regularly furnished. If scale is to be graduated in degrees of temperature the couple with which it is to be used must be sent to the factory for calibration with the Indicator. Indicator with range in millivolts from 0 to 16 is intended for use with rare metal couples and from 0-40 or 0-70 with base metal couples. Prices do not include thermocouples. 45242. Potentiometer Indicator, as above, without cold end compensation range, 0-10, 0-16, 0-40 or 0 to 70 st bh co) hic Ree eee ane ane Sener sos saviGnine co gocc ao SeReRERnGooRsa Dodo COON GNSasa7 125.00 45244. Extra for other ranges whether calibrated in millivolts or in temperature units.......... 5.00 45248. Extra for double srang @: <2) 2.,3.socs,c:clec:sisig'= sia o, oroteie sfersie cueiss 6 ace eee eee Eee 20.00 45250. Potentiometer Indicator, as above, with cold end compensator ranges, 0-10, 0-16, 0-40 or 0-70 MIlliVOlts: 6 a tastensea Sew eoe Comsat anise sttesloeeecras he tigers aa se Odes ee See ena 140.00 45252 Extra for other ranges whether calibrated in millivolts or in temperature units.......... 5.00 TEMPERATURE INDICATOR, Leeds & Northrup Balance Type, for use with all Resistance Thermometers of class A, 40--260° F., Class B, up to 1000° F., and Class C, to 1800° F., as listed below. The Indicator con- sists of a direct reading Wheatstone Bridge witha self-contained Galvanometer of new design and great sensitivity. The Indicator is calibrated to read directly in degrees of temperature when connected to any bulb ofa givenclass. The total length of the scale is 16 inches and, asa balance may be readily obtained to #:nd of an inch, the Indicator is easily read to #;ths of 1%. To make a reading with this 452 45254. (ee0S & NORTHRUP co, PHILADA:PA- No. 45254—Temperature Indicator No. 45260 Indicator, depress key to connect in battery and turn the scale until the galvanometer is at its balance position, at which time the position of the scale on the index gives directly the temperature. The oper- ator in thus reading balances the bridge; in such a reading all questions of galvanometer calibration are eliminated. On this account a balance method is always more accurate than a deflection method. Temperature Indicator, as above, complete in carrying case, with galvanometer and battery; but without resistance bulb; length of scale 16 inches; case 93 x 53 inches; weight 53 lbs..... 70.00 RESISTANCE BULBS, CLASS A, for use with the above Indicator. These are electrically ‘interchangeable and 45256. 45260. 45264. 45268. differ only in the style of mounting used. They are regularly furnished in the following ranges :— —40° to 120° F., +10° to 110° F., 30° to 250° F., —20° to 120° C. and —30° to 50°C. Ranges other than those listed cost $5.00 additional. Resistance Bulb, for General Service. This bulb is about as quick acting as the ordinary commercial mercury bulb. It has been designed to secure a maximum of strength and is practically inde- structible. The leads are firmly anchored to the bulb. Tube is of brass with dull black lacquer; diameter of tube 3 inch; length of winding 2 inches with length over all 5 inches............ 10.00 Resistance Bulb, Quick Acting. ‘This bulb will follow temperature changes about as rapidly as will a long bulb mercury thermometer and may be inserted into mercury without injury. Tube is of steel with ebonite head; diameter of tube } inch; diameter of head ? inch; length of winding 3 inches and 43 inches length CO) oir: | ea tS NEN TNS SS tr ee BE ee ay eens Suen 14.50 Resistance Bulb, with Non-conducting Case. This is exactly the same as No. 45256 except that the stem is encased in ebonite. This construction is especially desirable when the bulb is to be used when considerable temperature difference will exist between the stem and the sensitive end of the bulb. The non-conducting stem prevents conduction of heat along its length. This bulb may be employed as ‘‘wet bulb’”’ in hygrometry with success. Diameter of stem zx inch; GUase Chas MHA Mane OI NOs CGP Aegean soassbarsssceno onadandcaccompeesasonnboosnedaoce 12.00 Resistance Bulb, with Lead Covered Leads. This bulb is the same as No. 45256 excepting that it has lead covered leads. The lead cable is soldered with waterproof joint to the stem of the ther- mometer and, in ordering, a sufficient length of lead covered lead should be ordered to extend beyond the moisture zone. The cable used is } inch outside diameter with ~sth inch wall. As widely used in the U. 8S. Department of Agriculture for soil investigations. With one foot of EEN ihren nats sac aoa edie otic aicie ECE nee ESI OO eae SEIN n IanO OR con ARE mere ooo en 11.00 Extrasper toot foradditionalslength of leads! .. 5.2 eee se cee nae cee ee eee EER ent 15 RESISTANCE BULBS, CLASS B, for use with above Temperature Indicator in ranges, as follows: 200°-1000° F., 45272. 45276. 50°-550° F., 50°-550° C. and 0-250° C. These bulbs are electrically interchangeable with each other in Class B and with those of Class C. The material is bare platinum wound on mica which is protected by a case of pure nickel without the use of porcelain. Resistance Bulb, Round, 10 inches long; length of winding and stem 10 inches; length of winding 3 inches; diameter of bulb 2 inch, of head 1} IN Chis-ctenaee cin detctrs eee eee oasis eOeOl Extra per inch for Bulbs longer than 10 inches Dae Taco homo tide dic OF Coca CnC ORES ts Resistance Bulb, Quick-acting Type. In this bulb the platinum wire is wound on a thin sheet of mica and this in turn insulated by a thin sheet of mica laid on each side of the flat coil. This is inserted into a flattened metal tube. The stem is left round. The large surface of this type of bulb and its low heat capacity make it extremely quick in its action; in a liquid it is practically instantaneous in its action. Length of winding and stem, 10 inches; length of winding 4 inches; thickness at winding a;nd inch; width at winding } inch; diameter of stem Sth inch....... 32.00 Extra per inch for Bulbs longer than ON Chess ss ver eer oT re ee ee yee ee .75 Extra if bulbs are to be used in pressures of over 50 Ibs. per square inch............ eee 2-00 453 ASR sles bee BUR ak: etc Weel toy WE AN 8 @ “7O5 Mi Res vA Nie oy: RESISTANCE BULBS, CLASS C, for use with the above Temperature Indicator in the following ranges; 800°- 1800° F., 200°-1800° F., 500°-1000° C. and 0-1000° C. These Bulbs are electrically interchangeable with each other and with those in Class C. The resistance material used is an especially pure platinum wound on a mica cross. The mica of this cross is treated by a process which leaves it of a hard, non- transparent, rock-like structure. In the standard type of construction this platinum wound form is encased in a Royal Berlin glazed porcelain tube. A clear quartz tube is at times desirable although it is slightly more expensive. 45280. Platinum Resistance Bulb, for measurements of the highest precision; porcelain tube with fibre head; length of bulb 3 inches; diameter of tube }{ths inch; entire length of tube 19 inches; diameter of head 1} inches. T hese Bulbs are widely used in permanent installations for some of the largest chemical works in the U. 8... When used in connection with the above Temperature Indicator No. 45252 the accuracy of the readings without correction is 8° in 500° or 6° in nG8 of TAN PC. R UL aR Jole or Oe eMiierAs aa5 CriO Fy Me Pe ASN < No. 45404 No. 45412 Laboratory Combination of Wanner Pyrometer and Konig Spectrophotometer, particularly recommended for laboratory measurements of both temperature and absorption investigations in spectro- photometry; with small scale with absorption angle only, for tempera- Duty Free Duty Paid ULES EOF 2000 Cio srestcteve ras stoveic ctoisys/micisiolaia e ofaie 5. s1e.c Seeioretcare revere sents 195.00 260.00 Laboratory Combination, as above, for temperatures up to 4000° C........... 225.00 300.00 e sé « “but with large seale including polarisation angle device and temperature scale, for temperatures up to 2000°C.... 217.50 290.00 Laboratory Combination, same as above, but for temperatures up to 4000° C.. 247.50 330.00 Method of Using Thwing Radiation Pyrometer No. 45432 PYROMETERS, THWING TOTAL RADIATION, for the accurate measurement of high temperatures, based on Stefan-Boltzmann Radiation Law, i.e., the energy radiated by a black body is proportional to the fourth power of the absolute temperature. With no upper limit, and used commercially for temperatures as low as 500° C. Radiations of heat from a black body, or body under black body conditions as in an enclosed furnace, are concentrated by means of a receiving tube on a sensitive thermocouple and hence conveyed to the galvanometer, where temperatures are read directly in degrees. As the thermocouples have but small heat equilibrium, a reading can be obtained in five seconds. No tripod is required, the receiving tube being held in the hand and pointed at the object temperature of which is to be measured. No focussing is required as the instrument is practically independent of distance, so long as the diameter Thwing Radiation Pyrometer (Continued) 45420 45424, 45444, of the surface is 1 inch for each 8 inches of distance for a low range instrument and correspondingly less for instruments of higher range. Any intelligent workman can operate the instrument as nothing is required other than to point the receiving tube at the object and read the temperature from the scale. The outfit is not dependent upon storage batteries or standard of luminosity or upon the color perception of the observer and is equally accurate in determining temperature of hot metals in the open and not affected by extraneous light falling upon the body observed. Galvanometer is dead-beat, ex- tremely sensitive and highly accurate Complete outfit weighs 7 lbs. Pyrometer, Thwing Portable Indicating Radiation, with any single range temperature scale, com- 1) Ci Bios nonoecosadcousgte co cUUGEnrepESacadaoacoodon0apno0 GuDo DUS DUbon oD SUNS SscoCanoodS 120.00 Pyrometer, Thwing Portable Indicating Radiation, with any double range temperature scale, as 2500° F. to 3600° F., 2000° C. and 1400° C. These two scales are especially suited for open-hearth furnace work, giving correct temperatures of molten steel in the furnace and while pouring. Com- al er@lone udenpobs sodasedeadons ooncousonerconncacodseponpdeddobuacsadabsaucapoooacsob000: 130.00 Pyrometer, Thwing, Wall Pattern Indicating Radiation, with ventilated receiving tube for permanent installation above a furnace, or barium chloride bath.................0eeeeee eee eeeeees 120.00 Pyrometers, Thwing, Recording Radiation, in single and multiple record units. These Pyrometers have been found of extreme value on cement kilns, in copper smelters, incinerators, sintered ore plants, etc. With single record recorder... <./:/0/. aise scern olele elele 10iele) Sefer = -1elef-inioie =\e/olclr1~ fale i= iehetestatersts 180.00 Pyrometers, Thwing, Recording Radiation, as above, with two record| recorder). ©)... -\e-mateers 245.00 Note—Prices of Multiple Records up to 15 records on a single 10 inch chart, quoted on request. Pyrometer Cones, Seger, for temperatures from 600°C. to 2000° C. Rersboxaotiel OOS eects sieereteraicleioteh-sers 1.00 Each, in quantities less than 100......... -05 The following are the official melting points:— Cone egrees Cone Degrees Cone Degrees Cone Degrees Cone Degr wane re Nuns Conneate ~ beet Centigrade Nor Centigrade se Ccutisrade Now: Centigrade Nun Cains 022 600° O12a 855° 02a 1060° 9 1280° 19 1520° 34 1750° 021 650° Olla ss0o° Ola 1080° 10 1300° 20 1530° 35 1770° 020 670° | Olla 900° la | 1100° 11 1320° 26 1580° 3 1790° 019 690° 09a 920° 2a | 1120° 12 1350° 27 1610° 37 1825° 018 710° OSa 940° 3a 1140° 13 1380° 28 1630° 38 1850° 017 730° 07a 960° 4a 1160° 14 1410° 29 1650° 39 1880° 016 750° 06a 980° 5a 1180° 15 1435° 30 1670° 40 1920° Ol5a 790° 05a + 1000° 6a: 1200° 16 1460° 31 1690° 41 1960° Olda 815° 04a 1020° 7 1230° 17 1480° 32 1710° 42 2000° 013a 835° 03a 1040° 8 1250° 18 1500° 33 1730° No. 45444 Pyrometer Tubes, Alundum, impervious to gas under normal pressures through a wide range of tem- perature. With a high deformation point which, in connection with their imperviousness and high thermal conductivity, recommend them for this purpose. The tubes all have an internal diameter of #5 inch and an external diameter of {§ inch and are furnished with flange. Menge thyinehessas-n seer eee 12 18 24 27 30 36 42 Blache pasado ocehieee erase 2.40 3.60 4.80 5.40 6.00 7.20 8.40 458 No. 45504 No. 45512 No. 45516, ete. QUARTZ APPARATUS, TRANSPARENT. Pure Fused Rock Crystal. Rock erystal has a very small coefficient 45500. 45504. 45508. 45512. 45516. 45520. 45524. 45532. 45536. of expansion, will not crack on subjection to the most violent and sudden changes of temperature and is insoluble in water and volatile acids, with the exception of hydrofluoric, and has a melting point of approximately 1600° C. ‘lhe coefficient of expansion between 0° and 1000° C. is 0.00000054. The specific weight is 2.22. The coefficient of expansion for D is 1.4585 and the dispersion from C — F is 0.00676. It is transparent to ultra violet light above 185 uu For prices on Opaque Fused Silica ware see headings of various apparatus, i.e., Beakers, Crucibles, Flasks, ete. Beakers, Transparent Quartz, conical shape, either with or without spout. Canacity nCChepm meme cite cine cnr tees sion eaares 30 50 100 200 DIAC, WD . rnoduooocogcasu0 05d od500e" eo poEPood-ddhoe 35 42 53 68 LOY Nice SER ESS CR OOS Shean opac cerrets Peete erence oneS 3.60 4.80 8.00 12.09 Crucibles, Transparent Quartz, without lids. @epacity accra cc see occa: 10 20 30 50 80 100 DiametersumMesern. sere sca iacce 28 35 40 50 58 65 Bacher es ra eo ce eee rts 2.40 3.95 4.75 7.09 9.00 10.50 Midsie Bach yc rtesccre eke ccs erkonsereiesss 1.00 1.75 2.25 3.00 4.25 5.00 Dishes, Transparent Quartz, round bottom, with or without spout. (CEISACTING CO Sonera teceramnabtts 5 dabuasucd ane 5 o0 10 50 100 200 275 TAME LET RIMINI bs Warts oucieis omic serene baer eee _ ee 60 75 moses LOEVO Utiet lace nh: Ce oo teen GRIa ereaeen a co eneate re 2.90 4.80 7.25 12.00 16.00 Flasks, Transparent Quartz, flat bottom, Erlenmeyer shape. (ChiICIT WO pee shan on Mateoren meno obdmon nope rcceoboecat 50 100 200 300 DEV ts cade op toce > Reto EOS CRE EL orn SE OSES cst 4.00 7.25 11.00 16.00 Flasks, Kjeldahl, Transparent Quartz. Wapacitivaccersetr cs ciec.. oe sete e oie oreo erecpntorerstey loreal zeretetenere 100s 200 300 700 | DEVE] 1s au5 ho mte ea Ge HE a Cee eEEEEeD Or ee ont. acs xb 6o.0 bn 7.25 11.00 15.00 20.00 Retorts, Transparent Quartz, plain. GA MACILYAICC eos eerie. lele Me srenctans aris, ope tetsge te rs mune eed 50. ss 100——ss 200 000 LOTT Orel do DES b AOS OM ORS AED OO ORO crn hes Soe. eee s.Oino 7.50 10.00 15.00 27.50 Retorts, Transparent Quartz, with tubulature. GapAcliyAC name ac crac © seisiacte wis sis cielo encterspatenaeten teeter poe 0 es LOO 200 —-800 RCs cro aio ahs lolos clln'a. ana Goa wae relatersteye Chev cbeathars eters te yorer= 8.50 11.25 16.50 29.59 Test Tubes, Transparent Quartz. ILGRYSWny, Tee BeegoongacaneoosEEednooss 100 100 150 150 200 200 IDVEMAVAIGE, WEN pe gooosocusodcasonG00n NS DY elon Se 20 peo 20 Bachtercerrncrr atin. caccasacoels tas 2.50 3.25 3i5 4.75 5.00 6.00 Tubing, Transparent Quartz, with walls .5 to .75 mm. In lengths up to two feet. Bore; mnt. cele cra ciea cts 1-2 3 4-5 6-7 8 9-10 11 Perifoottne no. ee secs soe .95 2.00 2.65 3.10 3.65 4.25 4.75 Boremimieniye cee cees crc 12-13 4 15-16 17-18 19 22 25 Pers foot rer serscapcic ort eret eae 52d) sau 6.25 7.75 8.60 10.00 11.00 459 A R le Hy UR lle Te? iss (OS Me Ags Cr Oe} My IRF AS Ney RADIO-CHEMISTRY APPARATUS 45540. Radio-Active Minerals, consisting of the strongest minerals from which radium is being extracted. Radiographs may be taken with any of these specimens by placing the mineral or ore on the sensitive side of a plate in a black and orange cover and allowing same to remain in a dark place for two or three days, after which development is carried on in the usual way. The specimens in this collection and their localities are as follows: Pitchblende nal Autunite Carnotite Colorado Aeschynite... Fergusonite S B ae ..Ceylon Tantalite Monazite OO OGRE SEH eee Brazil Pitchblende. Samarskile z 5 2 Norway Cleveite Thorite........ 5 =“ Sloe antes aoe Ceylon Orangite Collection, as above, of twelve specimens Bn oer me Ne. 45542 No. 45546 45542. Spinthariscope, a fluorescent screen over which is mounted a small particle of radio-active substance- When viewed through the magnifying lens brilliant scintillations are observed. When obser- vations are made in daylight it is necessary to remain in a dark room for about five minutes be- fore scintillations are plainly visible. Sm all radium photographs may be made with the instru- ment and exposures made on photographic negatives by removing the magnifying lens.... 2.50 45546. Standard Battery, Krueger, for electrostatic measurements, consisting of 100 Weston ‘Normal Elements of small size with a total electromotive force of about 100 volts and with 105 ohms internal resistance. With six terminals. As used in charging electrometers, standardizing electro- scopes,ete. Duty Free 18.00 Duty Pads. 5- Re as - -- 24.00 No. 45548—in portable carrying case No 45548—ready for use 45548. Electroscope, Curie Type, portable model of American make for field use in the determination of the radio-activity of American ores, such as the Colorado Carnotite, and as used in the U. S. Bureau of Mines laboratories for this work. The illustration shows the door of the ionizing chamber closed so that the circular plate, on which the powdered ore for testing is placed, is not shown. The instrument is furnished with a reading microscope with millimeter scale in the ocular and with portable carrying case as shown. In the case are provided receptacles for two standardized samples of powdered Carnotite as listed below. In the field the testing is made by measuring the rate of fall of the leaf with the ore to be tested as compared with a ‘standard- ized ore of known Uranium content. With vulcanite charging rod and descriptive circular as to operahions 252955 $52 2. csccahSussiee cowie Soe ee a ee eee 50.00 45550. | Carnotite, powdered to 60 mesh, with percentage of Uranium Oxide (U;Os) determined by Ledoux & Co., for use as a reference standard with above Electroscope. Per 50 gram vial.......... 1.50 460 > Tee Ei USSR lols te Hie Om Me FAy IS GlOF SMe Re AY NY GY No. 45540 No. 45544 ELECTROSCOPE, CURIE, original French make. This instrument is furnished with equipment for measuring the radio-activity of solids, liquids and gases and also in a small portable form for field work. The laboratory form for solids is cony eniently arranged so that measurements of a great range of radio- activity as compared with that of Oxide of Uranium are possible. These adjustments are accomplished either by varying the area exposed on the plate ‘‘D’’ of the material to be measured or by changing the form of the discharging rod ‘*’1”’. Illustration No. 45540 shows the Electroscope as arranged for solids, No. 45544 for liquids and gases and No. 45548, the portable form for field work. Each instrument is furnished with reading microscope ‘‘M’’, with micrometer scale on the ocular, with which the fall of the leaf during discharge is very accurately measured. The principal constants of this apparatus as furnished by the French makers are as follows :— The potential required to deviate the leaf through the entire field of the microscope is about 300 volts and the value of each division in the eyepiece micrometer is 0.4 volt but readings may be esti- mated to 0.1 volt. The capacity of the Electroscope when mounted on a cylinder of 3 liters 1s 14 to 15 em, this capacity being independent of the angle of deviation. The speed of the spontaneous fall of the leaf under the best conditions, for instance 0.0033 div/sec, is 0.0013 volt/sec. The minimum speed of the fall measurable (ten times as great as the natural leak) is 0.01 volt/sec. The minimum current measurable in the cylinder is 2 x 10-!§ amperes. The minimum quantity of radium emanation measurable in the cylinders of 3 liters is 0.0019 mmg. min. The minimum amount of Radium Bromide which can be estimated by the emanation method (this quantity corresponds to that contained in 10 liters of sea water or in 50 grams of deep sea sand) is2, 3.10-7 mmgr. See M. Joly, Phil. Mag., mars et juillet 1908. The minimum radio-activity measurable in solids, taking Oxide of Uranium as unity, is 1/200. See P. Curie, OEuvres, p. 375, p. 691 et 693; Mme. P. Curie, Ann. Ch. Phys., Septembre, Oct. Nov., 1903; Mme. P. Curie, “Praité de Radioactivité”’ (Gauthier-Villars); Mme. P. Curie, ‘‘Le Ra- dium,’ ” 7 1910, p. 65 470; and A. Laborde, ‘‘Méthodes de mesure employées en Radioactivité’’ (Encyclo- pédie Léaulé, Gauthier-Villars, edit). Electroscope, Curie, complete for mineralogists, with reading microscope and discharging apparatus with plate and accessories. PD utya ree rte eee etc si. hoe 56.25 Duty} Paid’ pera ecrer 67.50 Electroscope, Curie, as above but without the lower cylinder, base and plate D, for mounting specially to suit the work intended. LDU LORE ES Goi Se ee a See 33.00 Duty*Padoee sons cece ae ee 39.60 Electroscope, Curie, complete portable outfit in case. DU EVAN Ne Ge ne tern. serosa. 50.00 DutysPaid’ ee. ee eer eee 60.00 Discharging Cylinder of 3 liters capacity, with metallic stopper and support for the Electroscope. Duty Freeiie snc. 5. oes ees ss 16.25 Duty Raiden ies. c- vee esce ine 19.50 Discharging Cylinder, as above, with removable cover. IDNtypE Kee were eet aes 17.50 DutyePaidi niece ee ere 21.00 Discharging Cylinder, 450 cc capacity, w a Eaehal stopper and support for the Electroscope. Du tysRreehe fe sr ere metse sion ce 12.50 Duty:Paids 4s. ce ee Beer LES) Black Oxide of Uranium (U; Os) for use as a relative standard. In 10 gram vials. MutysRreey-Psopecteiae ae hccks =r 0.40 Duty Raids eecc ee ie ese BOs Accessory for automatically stoppering above cylinders. Duty pEre@s 2528: cia ances dase te ie 2 3.75 Duty Paid! cs c.csosnn ess te ee eeOU 461 ELECTROSCOPE, CURIE (cont. ) 45568. Connecting Support for cylinders. DutysPreey son eee eee 3.00 Duty: Paid-) i.e ee 3.60 45570. Connecting Support for cylinders, with automatic stopper. Mutyehree seen dsc eee eee 6.25 Duty Paid! is. sce see eee 7.50 45572. Dessicating Chamber. DutyMhree sh: ice siechee este 6.25 Duty Paid... 2.22.50 cee eee 7.50 45574. Extension Rod, with bayonet catch for removing the electrodes from cylinder. Duty Freez. sad bach p eae ener 50 Duty Paid: 62 sss. oe eee -60 45576. Connecting Tube for the two cylinders. Duty Free. RR RS 00 6 3.00 Duty) Pald’s..cg econ eee 3.60 45578. Metallic tubular cooling device and boiler. Duty Free raat cesta aoe Od Duty (Paid) 23. 5 sconce soe 22.50 No. 45580 No. 45582 ELECTROMETER, SCHMIDT, for both solid and liquid substances, designed especially for the determination of very small Radium quantities by the emanation method, the emanation of spring and other natural waters by the so-called ‘‘shaking’’ method, for the plotting of decay curves and for the comparison of the radio-activity of minerals and other solids. See Physik. Zeilschrifi Nr. 18, 1905, Pay tk. Zeitschrift Nr. 7, 1906, and Fortschritte der Medizin Nr. 27, 1909. 45580. _Electrometer, Laboratory Form, as above with shaking flask, blower, thermometer, connecting tubing, stopwatch, rubber rod; frame for winding up wires and dish. Duty Rreevssss eee 67.50 Duty Paid... oscar eee 90.00 45582. Electrometer, as above, portable form, with tripod shaking flask, blower, thermometer, connecting tubing, stopwatch, rubber rod, frame for winding up wires, and dish. Duty Free 82.50 Duty Paid)..3.<....02-eeeeeeeeee 110.00 45584. Radium Standard Solution, as made in Prof. Schmidt’s laboratory, in Curie flask. Duty-Prees 3 /ce scree es oe 7.50 Duty Paid: 2... 2.2... cnesereeeee 45586. Charging Rod, for Electroscopes. The friction is produced between flannel and celluloid. Very conven- ient to use and produces both positive and negative charges. Duty ree: a. caicccnc con aecee ene 4.50 Stocksi3.2icc65 ance ese eo ee 6.00 462 45588. } MMMM ‘omit SUIT LM TTI mu ll No. 45588 No. 45598 Electrometer, Dolezalek Pattern, with long ambroid insulation to quadrants and terminals, the latter being placed in a very convenient position on top of the instrument and readily removable for cleaning. The suspension is strong phosphor-bronze with high sensitivity. Ample adjustment in height and rotation of the vane relative to quadrants is provided with zero adjustment with- out altering relative position of vane and quadrants. The scale readings are proportionate over a wide range. The use of phosphor-bronze suspension renders this instrument suitable for students’ work, the sensitivity being approximately 300 millimeters at one meter radius fora difference of potential of one volt between the quadrants with the vane charged at 100 volts. IDUtyAR ree Aeitrantie (ois 8 wid Seite 43.50 Dutyphaidteeracta eee teers oe 63.80 Extra Phosphor-Bronze Suspension, with hooks. Duty shree see. secs snears 5 Duty Paid...... cs B Sere 5 tei) Extra Vane, for above, with either plane or concave mirror, complete with suspension. Dutyehree ese settee eieicr-s)ere seco 3.15 DitypPaidssaeoe ee eee ees oe seclse si ASOD: Electrometer, Dolezalek Pattern, same as No. 45588 but with a 50% higher sensitivity. IDUtysP ree Gente dase arts sores 46.50 Duty Paid........ Deane Ree 68.20 Electrometer, Dolezalek Pattern, same as No. 45588 but with silvered quartz fibre suspensions, increas- ing the sensitivity about 100%. Price on application. Electroscope, Double-tilted Pattern, Bumstead. ‘Lhe two plates attached to the terminals are charged to equal the opposite potentials, usually 200 volts, and the gold leaf kept vertical and central by means of levelling screws. °, The sensitiveness and stability are easily altered by raising or lowering the leaf by means of the fine adjustment provided. This instrument has a sensitivity about three times that of the ordinary tilted form listed below for equal stability. The plates are insulated with ambroid and an earthing ter- minal is fitted into the case. The insulation of the leaf is ambroid. See American Journal of Science, December, 1911. Duin Le on On onon pe oooeaoouaenoODOuGEC 21.00 45600. Electroscope, Rectangular Tilted Pattern, Wilson, to the leaf. Complete on stand with levelling screws. Dutyehrees sce eee sae eerily 12.00 Dutyseaideyeernee er eee eect 17.60 45602. Electroscope, as above, but with reading micro- scope with fifty division scale in ocular. Duty Free..... ns Teed h OEE OOO a) Dnty aide eescrs ae eee 35.20 No. 45600 INS ate del Oe Ls H. shies (OF Mi AS es Cr (O) IMS eRe Again < 45650. Electroscope, Alpha Ray, Rutherford, consisting of aluminum about 4 inches cube, with optical glass Dutygbreemsee ees eee Soom eA Duty Paid) 2.652... 27.10 45654. Electroscope, Alpha Ray, Rutherford, as above with Tele-Microscope with scale. Dutyabreetensn ses oen ee eee 40.60 Duty Paid. [62500566 Se eee 52.90 45658. _Electroscope, Beta and Gamma Ray, Rutherford, consisting of an aluminum box with removable lid, insulations. Mounted on four legs, one of which is adjustable. When the instrument is used for the measurement of the Gamma ray only the aluminum aperture beneath the leaf is closed by the lead slide. Without reading microscope. Duty Preaek eae see Po ee ee 24.00 Duty Paid. ....2.520.2: Geese 31.25 45660. Electroscope, Beta and Gamma Ray, Rutherford, as above, with Tele-Microscope with scale. 4 45664. Electroscope, Alpha, Beta and Gamma Ray, Rutherford, fitted with Tele-Microscope with scale in Dutyab ree eis eae wees 69.30 Duty Paid... 02.2 sr eee ese 45668. Electroscope, Emanation, Rutherford, of variable capacity for the measurement of emanations from DutyiFreevee was oe eee 34.65 Duty Paid........20..... 342. see 45.15 45672. Electroscope, Emanation, Rutherford, as above, with Tele-Microscope with scale. Duty Brees.) Sascsiiceeiinao ce oeitecis . 54.45 Duty Paid........ .0.00.-4 eee eee 70.95 464 No. 45700 ( SJ Ta Sy, — } — = = = Antco] S/S ge E = == ) 2 we No. 45736 Bl KO Ss No. 45712 No. 45716 No. 45720 No. 45724 No. 45728 No. 45732 45700. Reading Glasses in nickel plated mount, with handle of ebonized wood. Diameteriof lens} inchest: one. sce ee 2 23 3 34 4 42 5 54 6 HacuswINnehese. mcs eae neces sees nsirsiss > 5 6 7 8 10 12 13 14 15 aC Meare. eoeeiee che svaverttastveve snchnici srs aise sataievosier soe 60 .80 1.00 1.50 2.00 2.25 2.50 3.00 3.50 45708. Receiver, Bruehl, for distillations in vacuum, with ground on lid, ground in stopper at top and one ground stopcock at side. With support for reagent glasses and with reagent pleases paso tet 8.00 45712. Receiver, Gautier, for distillations in vacuum, large model..................... 4 Selassie 400 45716. Receivers, of glass, plain. (CENA IM i QOsm eae eae SO oU NCU a OCC OREO Sore Laericcaiass donastore ae deeds aame sae can 500 1000 LR CUD ress voceley sy tect asde seers ier ace Teg Pag basta css. buona daverd fretata g, Sstane pa ea ctepbar pean tapes ogee reiciaya erento 25 35 45720. Receivers, of glass, with tubulature. WaA CUES NC Co eve stot copcte sis) s arane sfovavousbets: ora ists sharers ye ate ate 100 250 500 1000 2000 Cerri oct ciency osisiaaes aa ogee Sole geternais -18 24 40 45 60 45724. Receivers, of glass, with tubulature and ground in glass stopper. (WAMACIEYAUCC mien recor= terete tale marae el cpicre dels omy ween agsasl 100 250 500 1000 2000 [DEO A Oo SOndo DO Gon Ee ee eo acre ioc ae -30 40 50 60 70 45728. Reductor, Jones, for the determination of phosphorous by a rapid method as described in Blair's ‘‘Analy- sis of Iron, 5th Edition, p. 93. Tube only, with glass stopcock.. .........0.ce0eeeeeeee eres 2.00 45732. Reductor, Jones, same as No. 45728 but with support, clamp, two flasks, glass stopcocks and Zabber Egan eg ene ey cree ara ee NR aca oes chance ocu\ or aerei gla mere, ap lal Sacre perejote eeetolewers oteites tie lero bale aint taka srors simesaimtare 45736. Reduction Tubes, of Hardest Bohemian Combustion Tubing, with one or more bulbs in center, as shown in illustration. Number of bulbs.....:...... RoR Ree ae Ooh aie Sune ne aces wey eae 1 2 3 ILA jeden Sooo ose uboeodnos PEATE RO hon cee n OORT ease aa OU, 350 400 LOE os panes Sno Dene Die eo ek a ae nee Cet rigoe 5 bic rroa ote erate 22 30 35 REFRACTOMETERS. REFRACTOMETERS, ZEISS. The use of the Refractometer in its various forms in the modern chemical lab- oratory has increased with great rapidity. We recommend those who are not familiar with the construction or use of these instruments to apply to us for the following literature published by the firm of Carl Zeiss. Mess 160. Optical Measuring Instruments. Mess 292. New Sugar Refractometer. 165. Dipping Refractometer. “ 186. Use of the Abbe Refractometer in “172. Abbe Refractometer. the Sugar Industry. “ 173. Butter Refractometer. “ 189. Dr. Wagner’s Tables regarding the “188. Pulfrich Refractometer. Immersion Refractometer. “245. Interferometer for Gas and Water. and particularly for the list of refractometrical literature, which has become too extensive to refer to in this description, all of which are sent free of charge. 465 x Av MHUNGER: JENA No. 45760 No. 45764 No. 45776 No. 45780 45760. Refractometer, Abbe, Zeiss, with Heatable Prism, for the determination of refractive indices between ny=1.3 andn,=1.7 in fluid, plastic and solid bodies. The refractive index is read directly from the graduated circle. This instrument has found wide application in tests as to purity, the deter- mination of the proportion of known components in a mixture and in the analysis of food products, particularly butter, cheese, margarine, cocoa fat, lard and other comestible fats; of salad oils, cod-liver oil, lubricants, alkalies, linseed oil, varnish, turpentine, petreleum, paraffin, ceresin and other kinds of wax; gl+eerine, aniline; aqueous, alcoholic and ethereal solutions as, for in- stance, the solution of ether and milk-fat adopted in Naumann’s method of determining the per- centage of fat in milk; milk serum; and for determining the quantity of albumen in blood serum in clinical work. The Abbe Refractometer with heatable prisms may also be used for the pur- poses for which the Butter Refractometer and the Milk Fat Retractometer were originally intended by use of the conversion tables furnished with each instrument and the two special thermometers which are usually supplied only with the Butter and Milk Fat Refractometers. The accuracy in measurement is to about two units of the fourth decimal place. In case with Table of Dispersion and Conversion Tables, and stem thermometer divided in single degrees from 0-75° C. Duty’ Bree. 2oehaceGaccaienctteanite 100.90 Stock......c:cccoc.o8 soceeeeeoeeeeeae 137.30 45764. Refractometer, Butter, Zeiss, for preliminarily testing butter refractometrically, also for investi- gating fats, salad oils, ete.; scope of the ocular scale from np=1.42 to no=1.49; micrometer screw for measuring the tenths of a division of the scale, accuracy in measurement one unit of the fourth decimal. With a small flask of ‘‘standard fluid’ for the revision of the adjustment of the ocular scale, a table for converting the scale divisions into refractive indices. In case, with ordinary thermometer in 3° from 0-50° C., with screw joint connection for attaching to the Refractometer. Duty. Brees, 225h2dencaca eee 50.90 Stoel... oisd:siiecicsnhaittere noleereeees 69.30 45768. Refractometer, Milk Fat, Zeiss. This Refractometer resembles externally the Butter Refractometer and in both construction and manipulation is the same. The essential difference between the two consists in the range, and in the case of the Milk Fat Refractometer is from np=1.33 to np= 1.42, while the Butter Refractometer is from n»=1.42 to n,=1.49. The Milk Fat Refractometer has an accuracy in measurement to one unit of the fourth decimal. Complete in case, with table for conversion of scale divisions into refractive indices and vice versa, and including correc- tion thermometer to reduce the observations to 17.5° C. Duty Bree cee esc eeece ec ier 53.88 Stock... c.c6. scien. came oneness 73.27 Accessories for Above Refractometers. Duly Free Stock 45772. Stem Thermometer, only, 0-75° C. in single degrees..................- -90 1.80 45776. Wollny Special Thermometer, with butter and lard scales, with screw joint connection for attaching to the Refractometer.................... 1.38 2.25 45780. Baier Special Thermometer, with scales for summer butter, winter but- ter and lard, with screw joint connection for attaching to Refractometer 1.81 3.65 45784. Correction Thermometer, for milk fat investigations to reduce the obser- vations to 17.5° C., with screw joint connection for attaching to Refrac- [NOs Shae SORE OC OR et OnOnC co ntadoccdo: Dosa ocoduonaspodossDone 1.38 2.25 Note—Unless otherwise specified the above Refractometers are always supplied with the stem ther- mometer, as above listed. 466 AeeRY ork oH BW IR H Terie Om Mi Ag Ss CeO MP avAy IN < A.M HUNGER) JENA, No. 45788 Nos. 45808 to 45811 45788. Refractometer, Dipping, Zeiss, for Investigating Fluids of Low Refractive Index, especially dilutions, alcoholic, volatile solutions, etc.; scope of the ocular scale from n»=1.325 to n»=1.367 with an accuracy in measurement to one-third unit of the fourth decimal. In above illustration the refractometer hangs on the wire frame with its lower end, the prism, immersed in one of the glass beakers filled with the solution to be tested, the beakers being surrounded by flowing water at the required temperature. A rectangular mirror below the trough reflects the light from below through a glass plate into one of the rows of glass beakers. Because of its accuracy and extremely simple operation, the Dipping Refractometer has become an indispensable instru- ment in the examination of various products as to their purity, analysis of standard solu- tions, and to the rapid and very exact determination of the concentration of solutions. Dr. B. Wagner’s tables of various substances which have been investigated by means of the Dipping Refractometer are recommended for use in connection with it (Price $5.00). Complete in case, with free standing refractometer prism of acid-proof glass, with attachable beaker for the in- vestigation of quickly evaporating solutions and with a table for the conversion of the scale readings into refractive indices, but without Auxiliary Prism, heating trough or thermometer. DutysPRee ech cc ean cene 62.50 Stocker tree eter ce 85.00 Accessories for the Dipping Refractometer. 45792. Auxiliary Prism for investigating fluids in very small quantities, for deeply colored solutions, such as molasses, dark beers, etc., and for the determination of albumen in blood serum. With unpolished surface of Duty Free Stock contact slightly icountersumke cine e etait eee iets easter 3.00 4.08 45796. Heating Trough, as shown in illustration of No. 45788, for the recep- tion of 12 glass beakers, each containing 20 ec, for investigations in bulk, with a pines plate at the bottom of the trough and mirror below, and with 24 beakers 5b SUOGR EAE Ie eso DORE Con soe bean omnBroarer 7.50 10.20 45800. Thermometer, 15-25° C. divided in ;;ths, in metal case, with certifi- CALEROMACCUTAGY mertsorycicmis evetescierstein) aaket cnleeuscttetieye istoleten tate iiotcayeyeeorsi ts 4.25 6.12 45804. Stem Thermometer, 15-25° C., divided in +ths, about 8 em long, witha TECHIE; MUM Ce al Crome are = acy acistine cyccser sta eaeerere CMe eT ET eeoee -56 81 Tempering Bath, for use without a continuous flow of water, recommended when the Refractometer is only used occasionally and for investigations at indoor temperatures. The construction of this bath is based on the fact that a large volume of water with a comparatively small surface area is very slow in acquiring the temperature of the surrounding space. The outfit consists of the following :— 45808. Enamelled Pan, of about 10 liters capacity, with felt jacket and over- Duty Free Stock flow joint, 1 meter of rubber tubing and stopcock....................- 3.88 5.58 45809. Filler, for uniformly introducing fresh water into the pan without stir- PIM Ge WL PUM e ey a en erate. cvaease on oscoveyore eve ciate ae) sraqsiets se pers erctercararessisterars' 1.25 1.70 45810. Carrier (i) tor Retractometer: with Millon aera ee eee eee ae 6.06 8.25 45811. Umbrella Frame, for 12 beakers of 20 ce capacity; and with 24 beakers. 6.63 9.01 467 > TH USSR lal Rt OF SME AS es COL Ma ASN < No. 45812 No. 45828 REFRACTOMETER, SUGAR, ZEISS, a new and special adoption of the Abbe Refractometer for the sugar in- dustry. The wide adoption of the refractometric method of determining dry solids in sugar factory products has resulted in a simpler model of the Abbe Refractometer (heretofore widely used in the sugar industry), constructed with the codperation of the Physikalisch-Technische Reichsanstalt and the International Commission for Uniform Methods of Sugar Analysis. A distinct improvement is in the prism which is an Abbe double prism made of lighter flint glass and which gives a more open scale than the prism used in the Abbe Refractometer and which noticeably reduces the error in the refrac- tion quotient. The scale reads directly in percentages of dry substance and is now in the field of the telescope and is divided from 0-50 for whole percents and from 50-85 for half percents of dry substances. With this new instrument the darkest ordinary molasses may be accurately tested directly, without dilution. The instrument is adjusted regularly for 20° C. but, when intended for use in tropical coun- tries, is adjusted for 28° C., the temperature of adjustment being engraved on each instrument. Refractometer, Sugar, Standard Model, as above, adjusted for 20° C, with special thermometer from 0 to 50 in 3° with screw mounting. Duty ree seerr a cee tyra on 75.90 Stockyn5: 36 costo eee 103.22 Refractometer, Sugar, Tropical Model, adjusted for 28° C., with special thermometer as above. Mu typRree ee eee oer recs 75.90 Stock... 2 6.5.30. sate eee 3.22 Thermometer, only, 0 to 50°C in 3°, with screw mounting. Duty reer ao nqame veer sisisiete sre ssteseloisere- -90 Stock «.... 5:30.25... ee 1.30 Thermometer, only, as above, with fixed metal case. Muty i Rrees sansa aces eee: 1.25 Stock... oo. 520. 05s 35s ee 1.80 Refractometer, Pulfrich, Zeiss, designed for measurements of refraction (np) and dispersion (differ- ence of indices for the Fraunhofer lines C D F and G?) of transparent, fluid and solid bodies, either single or double refracting; investigations of fluids at high temperatures, including bodies that are fluid only under such conditions: and the determination of the differences of refractive or dispersive power of such solid or fluid substances as differ but little in their optical proper- ties. (The instrument is then used as a differential refractometer.) In the construction of the accessories which serve for the purposes mentioned above, special attention has been given to securing simplicity in the methods of observing and in the subsequent computations. All parts of the apparatus are, therefore, permanently fixed in position after being once properly adjusted, and hence are always ready for use. The computations for dispersion and other differential quantities from the data given by the observation are made by means of suitable tables in the same manner as hitherto for np» without the use of logarithms. In regard to accuracy the appa- ratus is designed to meet the requirements which are usual in spectrometric measurements, i.e., exactness to a single unit of the fourth decimal place in the refractive index and to one or two units of the fifth decimal place in the dispersion and other quantities depending upon differen- tial measurements. With Geissler tube, cabinet for the instrument and case for the prisms and accessories, and detailed directions for use, but without prisms or heat- Duty Free Duty Paid pa Cho Pens Gon oscneege osnddobedaas conanuccogEd uaUdOnSstaSnra< adds 118.75 161.50 Accessories for Pulfrich Refractometer. 45832. 45836. 45840. Geissler Tube,.with: H-fllin gases osecarecie setisceis cistesoie ode eievaiore ieee 2.00 2.88 Prism I (n,=1.62), for the determination of fluids having refractive indices varying from that of water no=1.33 to np>=1.61; including mount, Carrienandcementedirlassscell Snmaace eae terme eee eeaeee 12.50 18.00 Prism II (n,=1.75) for the examination of solid substances (glasses, etc.) having refractive indices varying from npy=1.47 to np=1.74; in- cludingsmount and (carriers -eecceee ee eines a eee ceereeee 14.25 19.44 Agua ale eke Ur H. Tachi On My Ay Ss Gy ©} My aR A ON: CY: 45844. Barium Mercuric Iodide solution (n,=1.78) specific gravity=3.6, about 35 Daty Free Duty Paid ETI SRNN ASN yeep ete va re ch wero tare siekay on afene te (aher pansion Siveve SI o tysve ey atay storave ays) shave kaceltie fossa ¢ -63 -90 45848. Prism III, for substances of exceptionally high refractive power, having refraes tive indices varying from n,=1.64 to n)=1.88; including mount and CALL OT essere ere tevereicta rat eree rane cP oseha Sic katate users niet staee en yar sesbeyONUe eae (arene yon eas 17.50 25.20 45852. Tube, 5 mm inside diameter, for the investigation of very small quantities of (Ibis ane coeera Cand Co COCE TOR ROCIO COC ATSICoe Mecho cere Sao nee 1.25 1.80 45856. Prism IV (n,=1.62) for the differential examination of fluids, with mount, GATELE THAN Gl COMET sare clatodtie sealers. sis lete!aralevh sheiesa oe ore reticle Lora rane eet 18.00 25.92 45860. Prism V (n,=1.75) for the differential examination of fluids, with mount, CABTICTAAN GUC OMETS croteiaprrctrerccinierc oie sinvaise am nenecessl orotate ete aise acne rao 22.00 31.68 AN SOS Me ELCRUIM ETA DDATALUS 3c ccatess choloye erties cleccrahereietavareierels a sovaraie eee a eae sist oroies oto keral oopelanee 13.75 18.70 45868. Thermometer, from 0 to 75° C., in single degrees, with screw for fitting into the EAH Lap PALA US ies Applications of the Water Interferometer The Water Interferometer is susceptible of a degree of accuracy which is 5 to 50 times greater than that of the Dipping Refractometer and is primarily intended for the rapid testing of natural waters. In the case of river water it serves for ascertaining the proportion of salts which enter rivers with the waste waters discharged by manufacturing establishments and which under local regulations are not allowed to exceed a certain percentage. The Interferometer furnishes a convenient means of ascertaining the course of flowing subsoil water from the analysis of the samples. The instrument furnishes, to quote another instance of its utility, a convenient means of continuously con- trolling the water supplied by mineral springs, wells, or storage basins. Water contained in engine boilers can be tested on the spot within a few minutes with respect to the whole of the salts present in solution. The analysis of seawater, as required for oceanographic purposes, demands a degree of accuracy which can only be attained with the aid of volumetric analysis by titration immediately after the sample has been obtained, that is, on board. The Water Interferometer has from the outset been so designed as to be available for use on board, and, with a short water chamber, furnishes readings which are quite as exact as those obtainable by the method of titration, while when used with its longest water chamber it can be applied for minute investigations such as hitherto could not be thought of. Moreover, owing to the high degree of accuracy of which the Water Interferometer is capable very sparingly soluble substances have now been made to yield to the refractometric method of analysis, i.e., alkaloids, minerals, colloids, and other extremely dilute solutions, which previously could only be dealt with physically by measuring their electric conductivity. The Water Interferometer is, in fact, a convenient and accurate water analyzer and as such admirably adapted for the permanent control of drinking water, river water, and the waste waters discharged by factories, and should prove valuable to water boards, public analysts, and others whose duty it is to test water systematically; for use in oceanographic laboratories and in connection with marine expeditions, and last, but not least, for the equip- ment of laboratories appointed for researches in physics, physical chemistry, and mineralogical chemistry. For more complete description write for a copy of Zetss Mikro 245 and see the following references, copies of which can be mostly sent on application. The Gas Refractometer. C. G. Gerrits, Thesis, Amsterdam, 1904. 1. F. Haber, Zeitschrift fir angew. Chemie, 19, p. 1717, Dr. Travers’ book Study of Gases 1901 published by Messrs. 1906. Macmillan and Co., St. Martins Street Leicester 2. F. Haber, Zeitschrift fir Elektrochemie, 18, p. 460, Square, London W.C. 1907. Rayleigh’s Laboratory Interferometer (new type). $8. L. Stuckert, Zeitschrift fiir Electrochemte, 16, p. 37, L. Stuckert, Zeitschrift fir Elektrochemie, 16, p. 37, 1910. 1910. F. Haber and F. Léwe, Zeitschrift fir angew. Chemie, 23, Bulletin No. 42, U. S. Bureau of Mines. p. 1393, 1910. Rayleigh’s Interferometer (original arrangement). Portable Interferometers for gas and water. Lord Rayleigh, Proc. Royal Soc., 59, p. 201, 1896; p. 97, F. Léwe, Physikalische Zeitschrift, 11, p. 1047, 1910. 1898. F. Léwe, Zeitschrift fir Instrumentenkunde, 30, p. 321, Ramsay und Travers, Proc. Royal Soc., 62, p. 225, 1897; 1910. 64, p. 190, 1899, and 67, p. 331, 1906 L. von Klemperer, Chemiker-Ztg. 35, p. 557, 1911. E. A. J. Cunaeus, Zeitschrift fir physik. Chemie, 36, p. 238, 1902 Water Interferometer No. 45964 is identical in appear- ance with Portable Gas In- terferometer No. 45948 No. 45948—Portable Gas Interferometer with hood No. 45948—Portable Gas Interferometer without hood 45920. Laboratory Interferometer, Zeiss, with standard 10 cm wide, 20 cm high and 200 cm long. The gas to be examined and the standard gas are each contained ina chamber 100 cm long witha cross section of 1 sq. em, making the capacity of each chamber 100ce. In a gas chamber having a length of 100 em the limit of error is similar to that obtainable by the exact method of analysis of gases in con- tact with mercury. Thus the percentage of carbon dioxide (CO,) or methane (firedamp CH,) can be ascertained with a degree of accuracy within 0.01 to 0.02%. With detachable gas chamber 100 cm long and cover, but without lamp. Duty Breer s.2 3 seenWenverice owoecists 125.00 Stocks. hie scce tee tse See 170.00 472 Ane Re i VHe (Wi R lole De Ele JOM UMS FAG) S Ga One Ma Ee Aw Ninny Accessories for Laboratory Interferometer. 45924, Nernst Lamp for a current of 100 volts, with extra burner, in fitting mounted on socket pin, with condenser, cable and plug switch for Duty Free Stock atbhachment) torordinary lamp yi ving eee: cies e- seiiseieieislsiefe sie -.s'= 15.00 20.40 45928. Osram Lamp, 3.5 volts, with fittings and condenser, mounted on socket 1937 BOURGES HONDO Rone Gobel BGO a Cros obo OER RnErI Cee arenes 6.25 8.50 45932. Six additional Osram Lamps, only, without mounting.................. 2.63 3.57 45936 Accumulator, 4 volt, in wooden case, with switch and cable........... 8.75 11.90 45940. OUR= Way COCK re nyate is cearcinre siete sie etre a skepeter terse ie sie ease ve lafe a toaternsreseeyele rss 1.13 1.53 45944. IPACKINGACASC ai crisie ey oe a epee TTS eM are eee telaus paeeeTe epee ote 4.00 5.44 45948. Portable Gas Interferometer, Zeiss, consisting of an upright cylindrical pattern of about 10 cm diam- eter and 50 cm long, the only part which is detached from it being asmall accumulator. With gas chambers 10 em long it reads percentages of CO. or CH, with a degree of accuracy within 0.1 to .2%. The weight of the portable pattern is about 11 lbs. With interchangeable gas chamber 10 cm long and detachable protecting cover, including condenser and lamp fittings with 3.5 volt Osram lamp on condenser. Dutyakrees 2 seis... care eciees 137.50 Stocker cas ree eres iloieceseere 187.00 Accessories for the Portable Gas Interferometer. Duty Free Stock 45952. Interchangeable Gas Chambers, 2 or 5 cm long.................--..+-- 13.75 18.79 45956. Six additional Osram Lamps, only..................0.e.e cece eee eee ees 2.63 3.57 45960. Accumulator, 4 volt, in wooden box, with switch and cable............ 8.75 11.90 45964. Water Interferometer, Zeiss, of exactly the same appearance as the Portable Gas Interferometer. In regard to accuracy it surpassesall Refractometers which have so far been in use for practical purposes and for ambulant research work. The water chambers are interchangeable and, according to their length, read the proportion of salt contained in a solution of NaCl, for instance, accurately within 0.03 to 0.003 per mille, and hence the instrument gives far more accurate results than the best readings obtainable with the pyenometer or by the methods of volumetric analysis. With an interchangeable water chamber 3, 1, 2 or 4 cm long and remov- able cover, including condenser and lamp fittings with 3.5 volt Osram lamp on condenser. Duntyghreese 5. ee eae 156.25 Reid (els Bs ee Seo aE EO SUDO 212.50 Accessories for Water Interferometer. Duty Free Stock 45968. Additionalawater Chambersseachee-ce ie neocoe Leone eee ee nee 18.75 25.50 45972. Six Additional Osram Lamps, only....................0c0 cece eee ee eee 2.63 3.57 45976. Accumulator, 4 volt, in wooden box, with switch and cable............ 8.75 11.90 j= (= “a 2 a No. 45980 45980. Refractometer, Fery, Hilger, a direct reading refractometer for taking the refractive index for sodium light of oils, solutions of acids, mixtures of glycerine, alcohols, etc., with water, sugar solutions, and other liquids of interest to the industrial chemist. This instrument possesses the following advantages :— It reads direct the refractive index of any transparent liquid with a uniform accuracy of nearly 0.0001, from 1.3300 to 1.6726. The glass with which the liquid comes into contact is a crown glass, which resists to an exceptional degree the action of chemical reagents. The temperature control is extremely simple and effective and forms an integral part of the apparatus. The manipulation of the apparatus is extremely simple and conyenient. Dwtypliree rite saain-ccioe teresa hati 159.30 Duty sPaidles-ne cece omar 218.30 473, ie oe | Up SR H. Pe HG Om eM Ay ts Cy (OF SM RAeeAS SING 46000. 46004. 46008. 46012. 46016. 46020. 46024. 46028. 46032. 46036. 46040. 46044. 46048. No. 46008 No. 46016 No. 46040 No. 46028 No. 46048 No. 46046 Respirator, Automatic, for protection of throat and lungs in laboratories, factories, mines, etc., where the atmosphere is filled with dust and poisonous gaseS............... 0. cece eee ences eee 2.00 Respirator, Automatic, of aluminum with pneumatic cushion which fits any face closely but scare GISCOMPOTb.§.. <5 .ic.e.c os sie.c.s arerese ews tials 0 tyeield oie’ e ile uc 41s, oe ove asa 10 cio s RIIOCEC oe ORC CERT eee 2.50 Retorts, Copper, for making oxygen; of heavy polished copper with iron clamp and brass delivery tube fitting with ground joint, diameter of tube 12 mm. (OEVEENOURYE. (OOS 8 Gorrg omEI SOLS o ogo antes © ae en enen eo oc 250 500 1000 2000 lO hh. cosein don 6 Rap mennme 6 Sto Serr nn Gna eeA eee ACOeGoanS 3.00 3.25 3.75 4.00 Retorts, Heavy Copper, tin lined, as used in distilling apparatus No. 26548. Capacitymeallonssscccescr nase teen cee fo 1 2 3 5 LOE (Wap o op OD AS COONS SSAC tro aeonen a ree aeee ae 7.0 8.00 10.00 13.50 24.00 Retorts, Best Bohemian Glass, plain. Capacitiyaicesescso--e-.- cee 25 50 75 150 250 500 1000 Bach yrs acissremscs ea tioes ss -10 13 14 18 -20 25 35 Retorts, Best Bohemian Glass, with tubulature but without glass stopper. Capacity sees. ceiac tony ccna se 0) 75 150 250 500 1000 Ma chretmeet ose hictetins cicrsinrseee sae 16 18 22 “Pas 35 45 Retorts, Best Bohemian Glass, with ground gl: ass stopper. Capacity Ce especiis crise coc eeiacre cre 25 50 75 150 250 500 1000 2900 4000 8000 ACh 5. colorspace tisietee Glare erin oss wows 7) 319) 221) 26) S045 55 loomed Retorts, Jena Glass, plain. Capacitysnccitenteriswsiets sities ccctess-ssieirsene « 50 100 250 500 1000 2000 3000 4000 8000 DEG ee tarcoo Beals Jere COO TE aCe tas ll 15 Al 34 45 68 .93 1.00 2.10 Retorts, Jena Glass, with tubulature but without glass stopper. @apaelby ices sancis actetrsisee ee ctaeis a tkerseiers 50 100 250 500 1000 2000 3000 4000 8000 JOEY Ups or Seen cectes So earn eer 319, ©) .20 232) 5063 OS ec Oa Retorts, Jena Glass, with tubulature and glass stopper. Capacity, ec...............-. 50 100 250 500 1000 2000 3000 4000 8000 10000 15000 Bach eisc cf-taccdimesineseles as 40.425 80 1.00 1.35 1.73 1.95 3.50 4.35 6.55 Retorts, Royal Berlin Porcelain, with tubulature and ground in stopper. CaPaciby Ce na tacicn t sitrsiscisteto eet auswrestiereperaistc, Goins cat oe late eek Gree 40 "140 DOE) Ren eee Sia St Sain tes ah ini heres 6G Oo Sce tome eenEene Soom meaaces 1.95 2.85 Retort, Royal Berlin Porcelain, with removable top, 470 cc capacity...............0002 eee ee eee 3.60 Retort, Infusible Bohemian Glass, with two bulbs, as used for making oxygen. Capacity ncesnece ate oe es te elect er ena oe cee 100 280 LOE (SESSA ICUS CCM EBB OCC C Ona OOc aoe on COO TOSS Ou SSer nose nEnEeeE pemedae ta 45 55 Ha OP Me Ay oS Cc 46056. 46060. 46064. 46068. 46072. 46076. 46080. 46084. 46088. 46092. 46096. 46100. 46104. No. 46080 “Wii | No. 46096 aI \ No. 46076 > ———> BATTERSEA EES ROASTING DISH No. 46088 Retorts, Iron, for distilling mercury, etc, with removable cover fastened by screw clamp and with delivery tube ground into cover. No. 46092 Cap aeltiynccnscrpcis acti icteiteiasin sod oie Soa orsernrorsieieheicmtorn ties 250 500 1000 2000 DRG 345 shoes cote nsec Gb DC USE AS en Eee a aa en meme Aae a 2.25 2.50 3.00 4.50 Rings, Concentric, Copper tinned inside, for water baths, etc., with cover. Nem berlin SCG Assis sas eraleiote mievsisiaisls sieleie sists < oldie oats Gebopemne 3 4 5 6 Outside diameter of set, inches..................0.2-0---0-0- 43 53 68 83 POTISC aerate ae ce alate cls Cela ecole or eens seers -60 80 1.00 1.25 Rings, Concentric, Royal Berlin Porcelain. Number in\setyoee sac. seite sce sca ste caafes sae 3s 3 4 5 7 9 Outside diameter of set, mm..................... 74 94 115 156 197 THO CO neocon mas SOonb Roo On Cmoc amtp eae a eee -80 1.20 1.65 2.70 4.05 Rings, Concentric, of japanned cast iron, with screw clamp on largest ring for attaching to upright support; outside diameter of largest ring 8 inches, with four rings in set. Perset......... uD Rings, Support, of japanned cast iron, with screw clamp with brass screw. Distance from center of support to center of rings 23 inches. Suitable for use on upright supports with tripod base and supports with rectangular base in the smaller sizes. , When used on the same support rings will beliconcentric. (Outside/diameter, inches: .--:< 222 [220 oo oe oe aie se ekarirte)-yei 23 33 LENG Uh osGdis 8 Ootsos One Se cd dle OO OCS Een Me ar mean ahha nina oon nuprage. do 15 17 Rings, Support, similar to above but with distance from center of support to center of rings 43 inches. Suitable for use on supports with rectangular base in the three larger sizes. When used on the same support rings are concentric. @utsrdeidiameter: mchesss -eriaecs a2 ose ers ses costes oe oa 4g 62 LOENO Uninc sions aieleie denad # OS DSe scp 60 Git deen aePRPR aI 5 ecomceticC 15 7 20 25 Rings, Support, of japanned iron, with straight extension bar 8 inches long. Distance from end of shank to center of rings 94 inches. A clamp holder such as No. 24518 is necessary when these rings are to be attached to an upright support. @utsiderdiameters inches seer eee -)-- eee ae eee 250 3t 45 62 DEG (ponseas summosesocucne nocd 9640 CoO OnE pEEOEADEEenonocdad: -10 12 o15 -20 Rings, Support, of brass with glazed porcelain inset, with screw clamp. @Outsideidiameter: mm sete eee oo cre cele cosine eects tetera 60 80 100 LOI? GES EHO SSR COadCosEndo ot oot 6 Soa CON GEE EeE een a Senet aac: Scone 45 50 350. Rings, Support, of brass, with wooden inset, with screw clamp. Outsidetdiameter. mm a--eereeaese mater ss eo Oe seers af ee oie slant 60 80 100 DEG Wee copdophchancocdnecc.>: 0006p Gono SERED AAnDpEdonsGccte dumaupaob.on 45 -50 55 Roasting Dishes, Battersea. Miametersin ches! ate teetsteteletyeye elastase (ois = tater eae ee ee Os 6 IEGTEO AG) SRaHEeIaS conten 6 6D cc Ge CuSO oO OREEEnn opOUDCnuoUe sm -80 90 1.10 2.10 Rubber Bands, of pure gum, in boxes of seven assorted sizes. Per box......... oagenbosooagsee 1.00 Rubber Bulb, of pure, acid-cured red rubber, as required in opsonic and serological work; about 2 cc capacity, as used in Dr. Wright’s laboratories.........- Jagd acesopsousconnetoagaes goonsons _.. 5 Rubber Bulbs, of pure black gum, for dropping pipettes, medicine droppers, etc.; superior quality. Capazeity ance (approxima te) pete taieissle)s ss) cbs oie ae ta cletetieledale eter ete ioe 2 3 5 lei YAS TS Seg Seo deea oo aeboc coo ndeReOemaeneecoere GaccamecanMDcooDC 45 50 -60 LE eP a cclsgepline Geico ODO O oom LoCo TEER ORD poo OnEpoo dHosrccdcnosds 4.80 5.50 6.75 Rubber Bulbs, of red non-blooming rubber, stout walled, for pipettes. Capacity, ,OUnCES kre Nos sy atlscise on eral eae Sees Ie PECL 2 r m Then eth win ches! sen a.6 es eens sacle Sisis/ Ge ASE mac eine pte center ers 1} 13 23 Dime Cerin Chess sees erotics Seis oe dhe = oslo Be ee Ce eens wen 175 iy Bia clis o- prea Ty Oe eais Cee sieters SOS HEME DAZED Ste eee ees cere 10 12 15 475 Ei Ni Wi “ae | No. 46128 No. 46124 No. 46132 { No. 46120 sa a 3 ‘ =a © 6 @) uw rm = == No. 46116 No.*46140 No. 46144 No. 46136 46108. Rubber Bulbs, of white composition rubber, large size for large pipettes, ete. Gength; inches .cssc.c areca maitre Paremicusievene seleesreincloimeeeiee iz ore 4 Diameter: Inchesianc..,.:.0-s5 4=-25 MM ===—— < No. 46180—Exact Sizes prea ent! (TALUS aes NOS #---25 MM - SNe IE ete ----18 MM. - ~---15 MM No. 46180—Exact Sizes DIAGRAMS SHOWING EXACT SIZES OF THE MOST USED NUMBERS OF RUBBER STOPPERS No. 46188 EXTRA LONG SHAPE --------34 MM -33 MIM s==-—--—= << No. 46188—Exact Sizes -=---25MM ---- ----l7 MN---= No. 46188—Exact Sizes 477 A Re Tone ues Jee Teh OSM PAs C {Ot 3Mi eRe CA BNE ey 46180. Rubber Stoppers, A. H. T. Co. Special Quality, made of selected stock containing a large per cent or pure Para gum and distinctly superior to the stoppers ordinarily sold as pure gum. Each stopper bears our trade mark. They are carried in stock as solid, one hole or two hole, which speci- fication must be given w ith order. When no specification is given solid stoppers are sent.’ Exact size of each number of stopper is shown in the diagram. iim Dereearnc eisets os seein eitae 00 0 1 2 3 4 5 6 Diameter Mb ibOPs MOM. - tc <)essie-et- 14 17 18 20 23 26 27 32 SSbottom, mm... 10 12 15 15 18 20 23 26 Number of solid stoppers per lb. 109 72 51 49 36 30 24 19 Perl based teonsccceeneincegiee 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 Nf beniteicrcyerrctiee woo or dental-dam, \per'oz.... 55. <5... 3-1. ce ee ee ee -35 46200. Rubber Tubing, Thick Wall, of pure black unvule anized gum. This tubing i is the best imported quality without any bloom and, for many purposes, is the best tubing made. For convenience and economy we have it put up in the European factory in neat circular boxes containing 10 ft. and 25 ft. lengths. Customers are encouraged to use these original packages as far as possible. On large quantities taken at one time we quote on application a price per pound somewhat lower than the price per foot. Inside diameter, mm. SSC ORES 3 4 5 6 8 9 12 15 18 25 Thickness of wall, mm.... x RS 13 13 1 2 2 3 3 3 4 Per foot in less than original lengths .07 .10 .12 .24 .30 .85 .60 .80 .90 1.65 Per foot in 10 or 25 ft. lengths.. -06 08 10 .20 .26 30 50 -65 75 =61.40 x ra 4 * x x 8S x 4 : ae Pheer Oe == z= ae as as gS5) ane =s a= os % =s ss == = Na == a= rs) Ses es Sis ss = = 5 =a zs 1 fg ct ae se = z= 22 =< a= Se) st Se ee 2 See Ss eS SS. Sa: “tN Jaane \ WAZ . a WS So SS ESS =a NaN — N/a | ay = OS Se ae ee [ \ \ \/ x h { a = — IP at } Hy | \ Oe) ae (A) Nee — Sag a — — = = = KO) Se Te —— Tia ii No. 46204 No. 46208 46204. Rubber Tubing, Thin Wall, same quality as No. 46200. Inside diameter, mm....... 13 3 4 5 6 8 9 12 Thickness of w all, mm. Es 3 & 3 1 + ey 2 Per foot when cut in jess pea enieinal feneenae 05° <06)<09 STO) 1S See Per foot in 10 or 25 ft. lengths. ................. 04 05 .07 08 <12)” <1seeOees 46208. Rubber Tubing, Extra Thick Wall, same quality and color as No. 46200. Insidesdiameternswmm se eee eee ane ern we 4 5 6 8 Thickness of wall, mm..... CURE ee aoe 3 3 3 bev 15 -20 25 -30 Per foot.. ro ~J 74) el AS Re Bd aE AUS AR H. ne En) OR aMe ACS CeO IMO A Nine a 46212. Rubber Tubing, Thick Wall, of exactly the same quality as No. 46200, 46204 and 46208 but of pure red unvulcanized gum. Imside diameter; mm... 3... ...6...- 3 4 5 6 8 9 12 15 18 25 Thickness of wall, mm............. ee 3 13 13 2 2) 3 3 Sid Per foot in less than originallengths .10 .12 .15 66 .£85 .95 1.80 Per foot in 10 or 25 ft. lengths...... .08 .10. .12 .23 .30 . 5 SDD MC OOO Mm Leo. 46216. Rubber Tubing, Thin Wall, same as No. 46212. ngiderdame tens mms. eee tsemicieieisiecs aisles’ srerelolal hs 13 3 4 5 6 8 9 12 Mhvekness) ofe wall, mime jan cee eyayers eclectic s cio ace $ t 3 $ _il 1 3 2 Per foot in less than original lengths........... [OG OGiENELO [Sie S26 38 Persootun 10025 ft. lengthste rc... -cterteir -- 105) 2055908 Yo IN. Bore % IN. Wace 1/32 3/321. WALL as Le \ Se GC Wate eke C ©) © ( \ 3/g1N. Bore X | / ) Vy IN. Bore X Vig IN. WALL 3/6 IN. Bore % Ye IN, WALL % IN. Bore X Yig IN. WALL \ No. 46224 No. 46220 46220. Rubber Tubing, Thick Wall, Hand Made, Cloth Wrapped. This is an extra fine quality of flexible tubing, guaranteed not to split and of great endurance when exposed to laboratory fumes. It Inside diameter, inches................-- + AG a ts 3 3 A 3 1 Thickness of wall, inches................ 30 mi 8 + t t a eis Per foot in less than original length..... ANS I) IB SIRS ENT PBS eR ee cat Per foot in original 12 ft. lengths........ OA Gee OS pameel Omar ch anal 5 en Omens 24 i DOME, 46224. Rubber Tubing, Thin Wall, Hand Made, Cloth Wrapped; same quality as above but with thinner wall. The } x 7; inch size is that mostly used for Bunsen burner connections. 1 ug Inside diameter, inches................ 3 His x Os 3 3 Thickness of wall, inches.............. ts ts ds is a5 a Per foot in less than original lengths... .05 07 10 12 20 25 Per foot in original 12 ft. lengths....... 04 05 .08 10 16 -20 46228. Rubber Tubing, Pressure, Black, specially selected for use on Nitrometers. All our Nitrometers when ordered complete are fitted with this special tubing. Inside diameter { inch with 7th han. Wee © LRN) ee Cen ee ee Oe els Ita € Rano co o ORS Cerrar ee Retard No. 46232 46232. Rubber Tubing, Pressure, of black semi-pure gum, very rigid to withstand heavy pressures. Recom- mended for use with filter pumps and similar connections. Impidetdiameter,sinchess. 2. s)he seis 5 33 r 3 3 Mhiclonessiofewallpinchess sess: eee sere ane a5 meas ase ll t Rereloots ee ee tee isle eels niatete siete es ciete ee eee 20 26 36 50 85 Ie lei 1 AR Els i Hee Oy Me eA GC). 4©)) Mie SRY AL NY ey 46236. 46240. 46244. 46248. 46252. 46256. 46260. 46264. 46268. 46272. 46276. 46280. PACS: DDD No. 46236 No. 46276 No. 46252 No. 46280 Rubber Tubing, for Gooch Crucibles, so-called ‘‘band’”’ tubing, very elastic. The inside diameter given is when measured in cylindrical shape, i. e., in position as used on crucible, and outside diameter is when measured flat. Insidevdiametersinchess eee comet cecasies ence enone 7” 1 $ 3 Outsidetdiametenssinches rr aaciicjate ee olecls ola eievalsieintel le rainter= il 1, ee as 1323 2 (| ona he inten SOOO GC Oe ETT oS Omer ado-od 20 25 -30 38 Rubber Tubing, Composition, Machine Made. This tubing is very inferior to our hand made, cloth wrapped tubing but is in some demand in laboratories and we carry in stock one size suit- able for burner connections, etc., other sizes are furnished on order at lowest market price. Inside diameter’? inch by, 7s inch wall: Per foot: :. 2.2. - 22. 0. - 2c clea eee eens 05 Rubber Tubing, Pressure, with canvas insertion moulded in the rubber; for very heavy vacuum con- nections. Insidetdiameterminchesss pee teeetine stent cece eanee eee is + 3 3 Thi cknessrotwallesinchesenercene emeeee coe seers iS 76 + 2 Per LOO Sr teccne ate rate a sista ote oie tates Sree fovals ai sls ev jays akereversperwie wiepeeslete -30 40 -60 1.00 Rubber Tubing Stretcher, for increasing bore of tubing for conveniently slipping over connection CUBES SLC e opc eee clece a Sra co eels avajeiciersiaiore wyare Syesececeelac ca alee lel e/e oreusle opera tote te tants ReTe Vel ke Kencte Oeele etal 1.00 Rubber Viscosimeter, Frank, as used in the rubber industry and as adopted as standard by the Inter- national Rubber Testing Committee. See Gummizeitung Nr. 27, 1911, and the India Rubber Journal, Vol. XLI, April, 1911. In wooden case, with thermometer, test solution and author’s certificate of accuracy. Duty#Preewy sonics ees hoes sie 17.50 Duty :Paid). ..03).;. i000 eee 25.00 Rupert, Dropssipery Cem page tocteisiere opm crevveeisy ce «us alsveies elviion~efeiolcsopese etevonot choca delet) Ghceetatat tea ee ae 30 Sampler, Jones, for convenient, rapid and uniform sampling of ores, cement, etc. ; consisting of a hopper, scoop, 4 sampling pans and brush. All parts may be readily cleaned. SizeSiinches sea neces eee oe eaiee eae e SeCare eae oe ate etsie css efsivie ole areca 4x4 6x6 8 x 10 A Bee Serb Uo Hos kmercktet Geen ny Dao Soe AME aaa eb Ae Ber oneS oo SA 2 a Each... fat sack MEAS SIT SIE EE Gh eisise eee meter ssi TO a ee MOOS 96 2 10.00 12.00 18.00 Sampler, with Scoop, 6 inches square with divisions } inch wide..................-.............- 2.00 Sand Baths, deep form, of sheet iron. Diameter, inches............. 3 See Oe CeO eee 5 10 Bachtecs ene heme cence ste -10 12 15 20 .30 40 80 Sand Baths, shallow form, of sheet iron. Diameter, inches... 2 3 4 Ge Co md 8 10 Bach certiecrne -08 -10 12 15 18 20 30 45 Sand Baths, of wrought iron, with burner to heat entire surface: adjustable to height. SH CAcH (0 HanD MO SSE ee So abo roto Dene bo car bon ep nee eooas En Oe 25x15 40x20 60x45 1 DET | Heater A een ero b An aGnA Jen Oo anenoaeaan.co ce amaco 7.50 8.50 14.00 Sand Baths, or Hot Plates, of iron, without burner. SIZORUNCNEB saree oc ey oraye here cet cke dete ta afer nialctese ake e atstivia lo) ore oletevaverersicsetsarioneierens 6x8 8x 10 10 x 12 LOE Usn jp qEsonuaceaaacesune 6 one ubGoumande ocoodeenaboooonoysoCURuOEC 1.50 2.00 2.50 No. 46304 SCORIFIER No. 46316 No. 46284 No. 46288 . No. 46328 46284. Sand Glasses, in polished wooden frame. BRImes MINUTES! east. = < faces o xcieas- postu te apne pet aca ps CY Me: eee 10. 30 ~=60 DING Nidan tecooc dodo See aeons 3030 oO sO mes 0-40-40 75 1250) 2°00 46288. Sand Glasses, for screwing to table or wall in vertical position; in brass lacquered mount. ELAM e IMINULES Me « saree =e eters eniaas sedis F 2.4, sas s:ovecergavsate SSeS i ae 3 5 ACh ee Po i aoe saiein Jah is Sdn adie none He RO 90 90 1.00 1.00 46292. iscuelchen,: Hofmeister, of very thin glass, about Qt inches in diameter, as used in organic analysis. Eydlb + Soascoc CocURe CORE eODS Ger one oe oo orEE ReGen so fa5c. 55 Bemed 4006 ccc aU D Oma o oes -10 46296. Scoop, Weighing, of German silver, with flattered bottom; total length 43 inches................ 3.00 46300. Scoop, of horn, shallow form, with handle. Hern pM enna ee ey eee res «csc te eiccte ceil ays.ci eis... qisisislepsiefels aree eee 100 120 140 160 IDE Ng = ipeomdnd soar DO aac BRO RE TODS ana OeEE ODEO oC ae san. -20 25 30 40 46304. Scoop, of horn, deep form, without handle. ILRI hs TONNES ohushoso ce oc cou Be eee Eee aeetoneeGoocascac: _60_ 80 100 150 DEG acanudonceyeeneens 5000.5. sOeeenbeoe Bprauneroce nosodtroon - -20 25 35 -60 46308. Scoop, Weighing, of glass, shallow form with flat bottom. IDET fy 1G TOE do need Soollddien SOOOn A ae aeEO Oe menE Aas onchcan i iano souES Sack 23 _ 33 LOG 0. 35 6 | Ren OA GOOG Soc HbG COURSE Bann eenMC on ete rmO eat o naa mento tn oo bon ore 40 -60 46312. Scoop, Weighing, of glass, deep form, with flat bottom. IVGhY HESTON agoacon aaeeT oe BER MIOOEb Sue one DoE ersrc nom So no coBDL ato aaS se OD as 25 33 LO actino Bn CREE SE en ao SOEs ae te Re Rint aaa.se ceo sce 6 rr ot 5.c 40 60 46316. Scorifiers, Battersea original make. Diameten iMchenweye ree case sco «cela eee 2 22 23 23 3 LEGER GUGM. 5 sbihs d sane choses HERDS BO BEA Rn a DB Se anae -20 25 25 28 32 Pers] 005s ese ie el nos Sones a! 1.20 1.25 1.35 1.70 2.10 46320. Screw Driver, watch-maker’s, nickel plated, very convenient in the laboratory for use on optical and other instruments; 5 inches long............ 2... e sence cee eee eee 25 46324. Screw Drivers, as above, set of four sizes, i.e., 33, 4, 43 and 5 inches long. Per set............. 1.00 46328. Screw Driver, opticians, 3 inches long, with three blades, large, medium and small.............- -60 Nos. 46348, 46352, 46356 No. 46360 46344. Selenium Cell, mounted, with 46 x 26 mm working surface, ebonite case, glass : cover and brass slide for darkening the window. T he selenium is spread DutyFree Duty Paid Over Platinum IriGiUM WILE... 6.2 b a. vn oa oe eee ciel = ele einen 25.50 32.30 46348. Selenium Cell, as above but unmounted. Fig. A of illustration... ; 15.00 19.00 46352. | Manometric Flame Apparatus with single flame acetylene burner ‘and ‘speak- ing tube, on stand. Figs. B and RC of illustrations ss ene eee cen tee 6.90 8.75 46356. Acetylene Generator, small. Fig. D of illustration................-.-.-----: 6.00 7.69 481 a UEEEEEEEEEEEEPUnnesneeseens Ae (Ree wie aR H. Ite el PSO Ws oS GG) OF (Me jee Au INey 46360. Selenium Cell, of new construction and great sensibility. These cells are mounted air-tight so that it is unnecessary to enclose them in exhausted vessels. The light of a match will reduce the resistance which the cell has in the dark by from 10% to 20%. ‘The diameters given are for the sensitive surface and the cells are supplied in ebonite mount | with terminals. JD SIGNI) 3 Ca ae ER Soro oP ho mista oe chr dono cman com amore é/'s\o 45 60 75 IDI TVALChponacn oor acoaompenebocadedooondad I ciskecrd ais 9.25 11.90 14.60 ID [ICAL itch! Gee eeE einstein o nm oeEKios NERA GETS AGG ONO cldboc oc O00C 12.25 15.90 19.50 46364. Electromagnetic Relay, of high sensibility, with special contact, for use with above cells. Dutyshreet) nos os eee ee 7.20 Duty, Paid iain 32S: eee eee 9.60 SHAKING APPARATUS tamrsriniiivinine: mite a iii “aH i i] Noh) | No. 46380 No. 46392 with 2-50 ce Bottle Head No. 46392 with 46396 Rrienaesen Flask Head 46380. Shaking Apparatus for Sputum, Rickards. This mac hine is widely and satisfactorily used in many large laboratories where routine sputum work is done on a large scale. The new model is a dis- tinet improvement, is directly driven with adjustment for varying the speed. The sputum is shaken in the original bottles in which it is collected. Furnished with electric motor only. = 110 volts, d. c. 220 volts, d. c. 110 volts, a. c. 220 volts, a. c. RO OU AKIin coas 1.00 oes OS BOE _ BN ecyeles «BO eyccles Bach... .. 90.00 93.00 97.00 99.00 46381. Head, only, for above Shaking Apparatus. carrying 4 bottles of from 125 to 1000 ce capacity 40.00 46384. Shaking Apparatus, exe ictly same as above, but with 4- ‘bottle head taking 4 bottles of any size from 125 to 1000 ce capacity. Speed may be varied from 100 to 1000 revolutions per minute, according tothe load. A practical and satisfactory apparatus for the preparation of vaccines, ete. ~, 110 volts, d. c. 220 volts. d. c. 110 yolts, a. c. 220 volts, a. ¢. Curnrentin ayccnehieeiee ore ; 69 cycles 60 cycles — Bach arcneiy a ree anos 90.00 93.00 97.00 99.00 — 46385. Head, only, for above Shaking Apparatus, carrying 24 bottles...................2.0.0000- 40.00 46392. Shaking Apparatus in Combination with Low Speed Centrifuge. As a shaking device this _apparatus is furnished with two heads, one size taking 2-50 ce bottles or two test tubes up to 5 inches in le sngth and with which a maximum speed of 1000 r. p. m. is obtained. The larger head takes 2-500 ce bottles at a maximum speed of 300 r. p. m. These heads may be used interchangeably with the 2-Erlenmeyer Flask head. Price is the same for the Shaker with either the 2-50 ee bottle or 2-500 ce bottle head, but does not include the 2-Erlenmeyer flask centrifuge head. 110 volts, d. c. 220 volts, d. c. 110 volts, a. c. 220 volts. a. c. Current csc ee ae oy ee 60 cycles 60 cycles Machtyascrycegi ee aan nce elton 55.00 59.00 65.00 67.00 46396. Head, only, 2-Erlenmeyer Flask Centrifuge Head, for attachment to above Shaker....... 10.00 46400. Head, only, 2-bottle Shaker Head. This head may also be attached to No. 24064 Centrifuge 20. eh 46401. Head, only, 4-bottle Shaker Head. This head may also be attached to No. 24184 Centrifuge 22. No. 46404 No. 46420 No. 46416 Shaking Apparatus, Hearson, with Water Bath. For maintaining a constant temperature between 30° and 90°C. Price includes thermometer. burner, capsule and motor for 110 volts direct current. As the range of each capsule is about 15° C., temperature at which the bath is to be used should be stated in ordering. DUtypR ree et terse ca. se oe 56.70 Duty Paid....... 85.05 Shaking Apparatus, Frankfurt model, latest noiseless constr uction, carry ing one ‘1 liter ‘flask or 6 smaller Erlenmeyer flasks. With water motor, as shown in illustration. Duty Free.. ... 56.10 Duty Paid... Asoo ncoo UD Shaking Apparatus, as above. W ith electric motor. V oltage must be stated in ‘ordering. Dutyahree: ies) sss . 69.30 Duty Paid... 83.20 Shaking Apparatus, taking either four small E rlenmeyer Flasks or four large ‘test tubes. IN. simple and convenient form of shaking apparatus of great efficiency. With water motor but without PE COSTHIRD 5o6 ca eee Ee ee one OnE Re one eb anee 15.00 46420. Shaking Apparatus, for one 1 liter bottle. With water tur- Duty Free Duty Paid bine as shown in illustration. 13.20 16.00 46424. Shaking Apparatus, as above, for two 1 liter bottles....... 16.50 20.00 46428. Shaking Apparatus, as above, for one 1 liter bottle, without turbine, for either hand or POWORAGDI WIN Gore eioeeiter sere 10.00 12.50 46432. Shaking Apparatus, same as above but for two 1 liter bot- Pessoa. Ronen tee: ators s 13.20 16.00 46436. Shaking Apparatus, for large bottles, operating on the same principle as above, for two 5 liter bottles, for power diving pba eee ree. 24.75 30.00 46440. Shaking Apparatus, as above, for four 5 liter bottles....... 29.70 36.00 No. 46440 Lo 2) ow 46444. 46448 46452. 46456. No. 46444 No. 46448 Shaking Apparatus (Kinotherm), Uhlenhuth, for shaking in constant temperature. Without burner, thermometer, or thermo-regulator. See P. Uhlenhuth und A. Weidanz; Prakt Anleitung zur Ausfiihrung des biologischen Eiweissdifferenzierungsverfahrens, S 150, Jena 1909. Motor aoe re eee Water Alternating Current Direct Current Duty: ‘Bree. eee ee ee 28.05 49.50 44.55 Duty. Paide eee ae 33.70 : 59.40 — 53.50 Shaking Apparatus, Poppe, for the preparation of organic extracts, emulsions, etc.; taking four Erlen- meyer flasks. With water motor................-- aa B ode iti dics a cee OE No. 46452 No. 46456 Shaking Apparatus, New Model, with electric driving, of robust and rigid construction for continuous operation; with eccentricity of the stroke readily changeable. Motor is furnished for both alter- nating and direct currents, 110 and 220 volts. Voltage must be stated in ordering Duty. Free: 35.2 eee eee 48.00 Duty Paid. ..... 2. 22...5 92. eR eee 57.60 Shaking Apparatus, Camp, (Patented) particularly suited for the rapid precipitation of phosphorous by the molybdie method, and dissolving steels or pig-iron for carbon combustion. Made to hold 6 flasks from 6 to 24 ounces, either Florence or Erlenmeyer shape; pulley 6 inches in diameter; power required about 3- H. P. Can be operated by small electric motor with suitable counter- shaft to control speed, or by direct connection to a water motor........... ites 3 AT) 484 4 Shaking Apparatus, Camp, as above but with wooden disc and clamps to accommodate 12 volumetric Haske OOlcemlompugarkan al ypisye ucts «<6 c:- 6 s.ciste. tae re ae ne eee Sore seein 35.00 Shaking Apparatus, Freas Electric, specially designed for shaking soil samples at constant tempera- ture; it can, however, be successfully employed for other purposes requiring constant tempera- ture below 175° C. Consisting of a rectangular oven built of asbestos wood, inside dimensions 14 inches high, 14 inches deep, 30 inches wide; equipped with a shaft to which is fitted six double adjustable clamps, easily removable for holding 12 wide mouth bottles, 12 ounce capacity. The shaft is rotated by means of an electric motor fitted as shown in the illustration. The shaft can easily be removed to permit of the chamber being used as an oven. The heating is accom- plished by a flat resistance wire wound heating plate, while the devices for maintaining con- stant temperature and quickly setting for any desired temperature are identical with those employed in the Freas’ Electric Ovens. Mounted on heavy iron stand as shown in illus- tration, complete with motor and 12 glass stoppered bottles, 350 ce capacity............ 175.00 : Ee View in Showroom Showing Incubators, Balances, Etc. 485 No. 46512 46500. 46504. 46508. 46512. 46516. 46520. 46524. 46528. 46532. 46536. 46540. 46542. 46544. 46546. No. 46500 No. 46508 No. 46536 No. 46544 No. 46540 No. 46542 Shears, for cloth, with nickeled blades and japanned handles. Motaldlengthy winches: scstis cltaerate ovechetesiel eisrecta eine eyo oie 6 8 10 12 Length of cutting edge, inches............ Serre ee TONe oi 23 oan Do) J eo Each. . ree Soe eto ak See oe DO 75 00m 1.25 Shears, strong and heavy y, with short blades, for general laboratory use; total length 8} inches, length Of cuttingvedge. 2k inches! o 2c see cee cn cite Soe ee: Deke ee Se ee 1.00 Shears, Tinner’s. for cutting metal and wire. Total length, inches......... 83 ink 124 Hengthion cuttinoedge, imchess...2.48- een se cee soe eee ee ee 2 2 3 LOG ie A a oe eee ee re ee re eee oh ape eI PE ete 1.50 2.00 2.25 Sieves, Brass Gauze, with Wooden Frame. INGEN cocSs gh eneweD See Poee sees eeanas 10 20 40 60 80 100 Each, 6 inches diameter................ 35 40 45 50 85 1.10 Each, 8 inches diameter................ 45 45 60 90 1.10 1.40 Each, 10 inches diameter............... -60 -60 70 -90 1.35 1.75 Each, 12 inches diameter......... .70 70 80 1.10 1.50 2.00 Sieves, Brass Gauze with Brass Frame, without cover or receiver. Mesh rere carn cee nee 10 20 40 60 80 100 200 Each, 5 inches diameter. ... . 1.00 1.00 1.10 1.20 1.30 1.40 4.25 Each, 8 inches diameter. .... 1.50 1.50 1.60 1.70 1.80 2.60 7.00 Cover and Receiver, for above sieves. For, diameter, inches..................-..---- 5 ees 1G RR eee rere ee ee ee I ee tS OOH MAO CA oa AONach ceeds <0: 1.00 1.10 Sieves, Brass, in nest of five, 20, 40, 60, 80 and 100 mesh, with cover and receiver. Wiameteryinchess ee ee see eee eo Em Mr Ri ee Boe a conte oe 8 PEP MES tye eens ESS eee eo es AO e te A ee 6.00 9.00 Sieve, Brass, with four removable brass plates with circular openings of }, 3, 1 and 2 mm diameter, respectively. The plates may be quickly attached and detached; 90 mm diameter......... 5.00 Sieves, Standard Testing, with seamless brass frame, according to the specifications of the American Society of Civil Engineers. These sieves are distinctly superior to those made of ordinarily woven brass cloth as the screen is absolutely square in mesh and made from the same gauge wire both ways; 8 inches in diameter. Mesh’. hermes eine ees 20 30 35 40 45 50 60 70 Opening, inches................ -.0340 .0198 .0176 .0150 .0127 .0110 .0087 .0073 i THM eee ae eee 864 503 AAT .381 323 279 221 185 Diameter of wire, inches....... 016.0135 O11 010.0095 009.008 -007 Ba cheater erent 3.00 3.00 3.00 3.00 3.25 3.25 3.25 3.40 Meshi ica. cceunct ace tm oe 80 90 100 110 120 130 140 150. Opening; nchessceee seers ee 0068 .0059 .0055 .0051 .0046 .00438 §©.0042 0041 sf PAM Aer pyres 173 150 140 180 117 -109 -107 -104 Diameter of wire, inches....... .00575 .00525 .0045 004 .0087 —-.0084 = .0029'—— .0026 lachon. Scns een ee eee ened 4.00 4.30 4.45 4.60 4.95 5.20 5.50 Mesh..... TRS ca saus tee 160 170 180 190 200 220 240 300 Opening, inches................ 0038 .0035 .0033 .0031 .0029 .0028 .0026 .0017 MOT ere eo aete 096 089 084 .079 .074 071 066 043 Diameter of wire, inches....... -0025 .0024 —.0023— 0022, 0021 ~— 0017 ~— 0016 _~—-.0016 Macheaieo-ccssisctiesaetoeee ae 5.80 6.40 7.00 7.35 7.60 8.20 9.40 14.20 Cover'and! Receiver for above; per set of one’each. s+... s-seese-- gos eee ee eee eee 2.50 486 [Xm RAR Tele Uf 1 Hala TES On Me AS oS G OF Me 'P* _ A. NE. 46552. Sieves, Standard Testing, as above, but in a telescoping nest of 8 sieves, varying in diameter from 5 to + inches and consisting of one each of 10, 20, 30, 40, 50, 80, 100 and 200 mesh. Per set.. 15.00 46556. Sieve, Cement, Bureau of Standards, of brass, 20 cm in diameter and 6 cm high, with standard woven brass screen. The 100 mesh sieve has .0055-inch openings and the 200 mesh has .0029-inch openings. WIG Ma kons cogsn bo oS Dn RROD 5 SORE TOE DED OS COD OGD BE CEOUO nO DU UDODUC ROT DOD eor br amt 100 200 Bach, with Bureau of Standards certificate..............-.cecccceceeseseececes 6.00 12.00 46560. Sieve, Sand, Bureau of Standards, of brass, 20 cm in diameter and 6 cm high. WISE Ses: ALS Sok COE RE, ALG Pe La eC Ee RIS CT AED CEL OR ce eee CO 20 30 Openings pinches sry tects teas teeters aerated oreo lreterersfeeeis aimee = 0.0335 0.0223 46564. Sieve, Brass, with circular openings in bottom as used in soil and fertilizer work; with seamless brass frame; 5 inches in diameter; of same construction as No. 46528 and 46532. DIZELOMOPEDINES WMM eel saeferso ciel ose ie os aoe ee el 2 3 ok DEG Wheto oniaa pee Gcoa bo Renan dats Hee 3 Ae ne eeinese 1.50 1.50 1.25 1.25 1.25 46568. Sieves, Brass, in set of 5 as above, with circular openings 3, 1, 2, 3 and 5 mm; 5 inches in diameter, with Cover andireceiver Mb ersebe eterno tec. enes ns =o cas seer cie Seine ye ee tei tiete ett yarel 7.75 SMM Daan iy >» ll No. 46572 No. 46576 6572. ieve S ing } ine, for motor driving. The horizontal motion takes place on ball bearings oper- ating in oil and the machine is noiseless in operation. With an enamelled sieve of 200 mm diame- ter with 6 inserts same diameter. Other sieves of same diameter in varying numbers may be used on this machine, being conveniently held in place by the strap over the top as shown in US PSO Oper aa eee Neier es tee eee einai Sane Ae eM wean Abod bod] 25.00 46576. | Sieve Shaker, Braun, for 8 inch standard sieves. This apparatus will be found a great time and labor saver in grading samples of sand, cement, ores and other materials. In repeated tests, using the same sample, identical results are obtained, which guarantees the reliability of this machine. From one to eight sieves of 8 inch diameter can be placed in the machine at one time. These sieves are mounted in a brass frame supported by a chain. The supporting arch is adjustable so that when a small number of sieves are placed in the hanger it can be raised to the proper height, thus allowing the surrounding frame to strike the sieves. A special hanger allows the sieves to rotate slowly while being shaken. This rotation is caused by the peculiar shape of the surrounding frame which strikes the sieve on all sides, securing a complete separation of the vari- ous mesh products. The interior of the surrounding frame is lined with leather, which protects the sieves. It is very light running and requires little effort to operate. In a test run, using a 10 gram sample of sand, it requires 7 minutes to obtain an accurate separation using 8 sieves from 10 to 200 mesh. For hand operation, without sieves...............22-..0-ceeee seen eeees 50.00 46580. Sieve Shaker, as above, but with electric motor drive, for either alternating current of 110 volts, 60 cycles, or direct current of 110 volts. Current must be specified in ordering. Without sieves. 90.00 487 No. 46580 No. 46584 46584. Sieve Shaking Apparatus, for use with either hand or power, on wooden base 11 x 20 inches, height over all17inches, Will take conveniently from one to four sieves up to 6 inches in diameter. 30.00 No. 46588 No. 46592 46588. Sieve Shaker, Per Se, taking standard 8 inch sieves, for power or hand driving; as used in sieving rice, drugs, emery, corundum, fire clay, litharge, silica, sulphur, cement, phosphates, pigments, sugar, gunpowder, guano, whiting, salt, starch, flour, linseed, cottonseed, boneblack, ete. The mechanical motion secured in these shakers is an eccentric, semi-rotary motion with a vertical drop. The sharp vertical drop or jog has been found very necessary in order to free the meshes from those particles which would ordinarily remain in the apertures of the cloth and to which in a great measure the efficiency of the device may be ascribed. These movements simulate very closely those obtained in hand manipulation of individual screens and the results secured show very close agreement between hand and the mechanical method. The machines are mounted on solid base with firm clamping device for the sieves. Without sieves.................. 90.00 49592. Sieve Shaker, Per Se, as above but with directly connected direct current electric motor. Without BIO VESs.cicihcrsieicic ie mete ela tala bere e eK fo ToNSG STE IOS oe OCG STA STS LeTSGOISIS ee eek Rte eee ee 150.00 > 2) ba | a (e vo) c J Fi Ole Man Avs S GeOe My Ry Ay EN No. 46604 46600. Silica Rod, Opaque Fused Silica, useful for stirring and pouring at high temperatures, particularly in the case of high melting metals and alloys which do not form basic oxides, also for the con- struction of delicate physical apparatus where material is required with extremely small coeffi- cient of expansion. Furnished in lengths up to 6 ft. Diameters eee cceon | Serta tecarses oe 1-2 3 4-5 6-7 8 9-10 JE) at UNS See oo CGRIGE > a cielo Serer 40 -50 75 1.00 1.25 1.40 46604. Silica Tubing, Opaque Fused Silica, The unglazed tubes, while rough on the outside, are glazed as the ends and comparatively smooth on the inside. The glazed tubes are highly glazed on the outside and at the ends, presenting a distinctive homogeneous structure throughout. The unglazed tubing up to 9 mm bore is finished in so-called Satin finish. Furnished in all of the sizes listed in lengths up to 8 ft. but when lengths less than 1 ft. are ordered an advance of 10% is made in price. Larger diameters are furnished at special price. BOLE pMM as asso enn ade oe 1-2 3 45 67 8 9-10 11 12-13 14 15-16 17-18 Thickness of wall, mm....... .5-8.5-25 .5-2 .56-2 5-2 12 1-2 12 12.5 1-25 1-2.5 Unglazed, per foot........... ED eee 4 seen OO ll Oneal 40 n-ne GO Ie 75 mnt -90 GAZ UN OT LOO beers corel ioy ie eke ie retort terete sue ciate [ois vis neteinteiers aisreteregste ss 1.75 2.10 2.25 2.40 Extra, closed atoneend..... .10 .15 .20 .20 .20 .25 .25 .25 .85 .35 .50 IBOrew mim sae oo. seen eee eee 19 22 25 28-29 31-32 35 38 41 44 48 51 Thickness of wall, mm....... 3 138 £38.24 24 25 25 25 25 25 2-5 Unglazed, per foot........... 2.10 2.30 2.50 2.75 2.90 3.00 3.20 3.35 3.50 3.75 3.90 Glazed, per foot.............. 2.60 2.80 3.25 3.50 3.65 4.00 4.20 4.50 4.75 5.10 5.30 Extra, closed atoneend..... 50 65 .75 .75 .75 .90 .90 .90 1.00 1.09 1.00 No. 46608. 46608. Slide Rule, Nestler, for chemical calculations; of mahogany, with scale on white celluloid; providing for all calculations as met with in chemical practice. Complete in case with instructions for No. 46612. Back 46612. Slide Rule, Duplex, designed to adapt the logarithmic and cologarithmic scales to the rapid solution of the problems encountered by the chemist. The symbols on the rule, being arranged in the order of their molecular weight, are easily found, while the application of a very simple rule enables the chemist to locate other symbols of less frequent occurrence. The rule carries 138 chemical symbols which include the common acids, bases, salts, oxides, and elements. As each symbol has its individual position corresponding to the logarithm of its molecular weight, the number of permutations and combinations possible covers the requirements of almost any prob- lem. By using the logarithmic and cologarithmic scales in conjunction with the chemical gauge points, problems in Stoichiometry, such as gravimetric analysis, volumetric analysis, equivalents, percentage composition, conversion factors, volume of gas from a given weight of substance at different temperatures and pressures, and many other analogous problems are readily solved. The rule is accompanied by a manual giving the theory of its use together with numerous examples of both an arithmetical and chemical nature. Length 10 inches, engine divided, divisions on white facings, glass indicator, in morocco covered case, ‘with directions....................++06. 8.00 489 OF UME A Ss CG OF Me URS SAS Ney. > ve) ta | pa (; 2) ae ta} apy No. 46616 46616. Soil Borer, American type, regularly furnished with shaft 1 meter long but can be supplied in any length desired by means of extension pieces 1 meter in length. DiameteromcurtermMmsseeere perce eect ins a!) 80 105 130 150 Paty Mree Saat a Mama ein here eons Lars iis 3.45 3.80 4.15 5.15 5.75 THA fal &t:1 0 le ce Rene Cae is a een car SA eee 4.60 5.00 5.50 F 46620. Extra Extension Pieces, 1 meter long. oa cy Duty Free 1.15 Duty Paid ee OW a0c00 <= No. 46636 No. 46644 No. 46648 No. 46660 No. 46664. No. 46568 46624. Sodium Spoon, with ramrod and tube mounted on handle.... : : 2 Uo eee 25 46628. Spatula, Glass, 6 inches long, with flat ground blade 3 inch wide.......... ois ten Ei ee 46632. ss Horn, double, with spatula on each end. Length, mm... OSE MOO 120 150 100 240 280 300 Bach... <1 : ae -10 12 15 25 -40 -60 -90 46636. Spatula, Bone, double, with spatula at each end. Length, mm..... SAG ae Wid ane pos ape Soe nae eee (150 —__—-200 LOE VGs bee Ome Da Seen denies Se : Sh Senos eee 20 -30 46640. Spatula, Solid Nickel, double, with spatula on each end, and not flexible. Length, mm......... en a Rt he 20 150-180 210 aches ae Sec a den ocgtoaoe | ail) 70 ey as 46644. Spatula, Porcelain, double, with spatula on each end. Length, mm........ * 05 130 160 1850 23D eee 260 Bach cere yr eis ee ee aati ei os .28 .28 40 40 60 £80 46648. Spatula, Porcelain, single, i.e. with knob on one end and blade on other. lb@uvqANy pte Coes anc acsoSocu0 0 gnoeua. oSoenEos : i Aiea coe 235 290 340 LOYD (HE BAe ee Gace oda HoUoRS GO OOOO MOET So 003 5 pale fasta ova eyanclie te ae eee 55 70 90 46652. Spatula, Steel. very flexible, with cocoa wood handle. Length of blade, inches..........-.-.---------- 3 4 5-6: 7 See Bia cheese Sete Sta erence ae . 25 26 30 40 S50 ee6OSMLOOMIEZO 46656. Spatula, Steel, with nickel plated steel handle Length of blade, inches..........-....-.---++-++- 3 4 5 6 8 LOI (hadedinnbenube cod obhepadqndeghoccuenh sanade 45 50 -60 65 -90 46660. Spatula, Steel, with very flexible narrow blade and blackwood handle. Very convenient for weighing. Length of blade, inches............---- 5-022 e sees ee eee ) 3 ees 5 6 iDEYd Woaneoe donboosodecocdonsonndconuoces sodacs gocegenaados 35 40 -50 -60 46664. Spatula, Hard Rubber throughout, with very thin flexible blade. [bony ang ivr estapsdoo ecco gs OSU sc aocos 9 acs 00 c0s0d0suooCaD ces DEnboD 4 16 8 Bachsoutittt atte ola at Seek oe BN oer te Woah aa ene AB 55 .80 46668. Spatula, folding form, i.e. like pocket knife; with thin, flexible steel blade } inch wide and 3 inches long, in ebony handle; very convenient for carrying in the pocket......................... 75 46672. Spatula, short form, with wide blade, so-called ‘‘Pill Knife,” of steel with ebony handle. Length of blade, inches........... . 2. -eee cee cece eee tee eee e eee cece eee ees 24 34 LDL) eee Boonadand asada coscdecaombccoosduacumeuoe so onsndnecoooos acco A0 -50 AVR ee He (UF TR Fave Pichi WOM IMers Avy :S' CG OF Mh {Ry PANS ONT LY / Ho No. 46680 No. 46684 No. 46688 No. 46692 No. 46696 No. 46700 No. 46704 No. 46708 No. 46712 No. 46716 46676. Specific Gravity Bottle, Gay-Lussac, unadjusted, but with perforated stopper for adjustment in the laboratory. (Chiskrerin® Cessaogeaneccoopmce 1 2 ons 10 25 50 10 TET Ae ane a relen ae ay SAN) 20 25 -30 40 50 46680. Specific Gravity Bottle, same as Nc 46676 but accurately adjusted. Gapalciiyeiceiess-iceciss eee DE 2 5 lO Ss 25 30 100 LDEXO US Ne ee ori eee -60 60 60 70 -70 1.00 1.10 46684. Specific Gravity Bulle: same as No. 46680 but in tin case with tare weight. Capacity, Geet: tle : fe Vives 10 25 50 100 Each.. is 1.50 1.60 2.00 2.40 46688. Specific Gravity Bottle, new conical shape, with thermometer rea ading to $° ground into neck. (@angacluyaec Corr ee ey ee See ees see ee re eee OP 25 _ 50 100 LOE Sena el ae ee Se dL en Ce OD C EE oe nes 2.25 2.50 2.60 3.00 46692. Specific Gravity Bottle, Boot, double wall with vacuum space between the walls. For constant tem- perature work: with ground cap. Capacity, ce........ : 25 50 aC Hara ictoee ta iets Seance tereiacaitchs Sharaiis, liste. host fvclaielc tela Bibneviotlenate 2.80 3.00 46696. Specific Gravity Bottle, Kohl, with thermometer ground i in the side tubulation and with “capillary tube ground in the central tubulation and divided in millimeters..............-.....--...----- 3.25 46700. Specific Gravity Bottle, Regnault, for liquids, with ground in stopper. (CW oF Verh ol Ce Saige moe DI DGS Se oe eae OME EOC OOo Oo OOUSoo OG sco oonaDaG ato. oR ay 1 DEY) Ue od crane esaians on Sno Ro tid ln Ge dene ne Re EE atone potatos 4 OonAD son conGdods -50 -60 46704. Specific Gravity Bottle, Regnault, for solids, with ground in stopper and capillary ground into neck Ofuflasktae @apacktyay cess csmette ctr cet emece/sncier eer ist ta eieiaecerine einen terstaestets ~ A eY) lDE-T eH NBG cena n SERA Cin nnn BO AROS oR oe a eEnoncet cous Ab GAO acing ap as Gm amiay 75 -90 46708. Specific Gravity Bottle, Reischauer, with ground in glass stopper and Repatale funnel tube for con- venient filling. C Spaclty (CGH. cphecitescwinccanstncice Waster eee 25 50 100 I BEVG! (sta bid (cram te n.2 sok SA oe ee a or eer a ROR OI Envir 6 By codecs lenge 1.00 1.25 1.50 46712. Specific Gravity Bottle, same as No. 46708 but with millimeter divisions on neck. (CErSENGingeCOs ni ndlee. dacs ocosseeeoR ponbUn amen ssesoucaccocopodocdnn 25 50 100 IDEXOUE 5.6 2 capo ciarninl SSO cid GE OD DU et Oar GET GUE Ec DO on bictora 0 oUrack 1.50 1.75 2.00 46716. Specific Gravity Bottle, Reischauer-Brinton. Consists of a 100 ce glass stoppered flask with special narrow neck so made that the 100 ce mark falls low on neck. Furnished without calibration. Empty flask with stopper weighs from 18 to 20 grams. Inside diameter of neck is 6 mm. See Journal of the American Pharmaceutical Association, August, 1912.............0.022 eee eee 1.25 eee) AWGT.CO. No. 46720 No. 46724 No. 46728 No. 46736 No. 46740 46720. Specific Gravity Bottle sNicolusubeorm: Or Liquids eens Senne eet ee aan netaeeen: we 50 46724. ee Hogarth, for iron ores and similar material’) saya eters. dee 2200 46728. Specific Gravity Bottle, Sprengel, with caps ground on. AelaisisishpkeOe. 46732. Ye with normal thermometer ‘and ground in suction tube...... 4.00 46736. Specific Gravity Bottle, Walker, for liquids, according to Bulletin No. 109 of the U.S. Department of AoricoltuLe wouLeaAlmoing Chemistry.-7 eae cere eee eee een eee eee 2.00 46740. Specific Gravity Bottle, Walker, as above, for viscous liquids.................--.00c cece eeeeeeeee 2.00 491 No. 23844 23844. 23848. 23852. 23856. 46744. 46748. 23840. 23841. 46800. 46804. 46808. 46812. No. 46800 No. 23848 No. 23856 No. 46744 No. 46748 No. 23840 Specific Gravity Bottle, Le Chatelier, as used in cement testing....................2-2+2-2-20000- 2.00 Specific Gravity Bottle, Le Chatelier, new form, in accordance with the U. S. Bureau of Standards requirements and as used in the U. S. Government test for Portland Cement. See Circular No. 33 of the U. S. Bureau of Standards, without certificate..................... Be gs 00 3.00 Specific Gravity Bottle, Le Chatelier, an above but with the certificate of the U. S. Bureau of Stand- Ei0 | Je Oe Cee Ear ee See Mma Cane noite bob acobcoacodbavconce ccc. 5.00 Specific Gravity Bottle, Schuman, with tube graduated to'50)ccein 7yths:..... 2.3) oe eee 2.50 ‘ Thorner, for solids, particularly coke and charcoal; also used for the deter. mination of porosity; graduated from 0 to 100 ce in 3ths. Price includes cylinder. .eeeee 3.60 Specific Gravity Bottle, Hubbard, designed especially for bitumens, heavy oils, ete., with solid stopper ground in, with an opening of 1.6 mm diameter instead of usual capillary. Capacity 24 ec. 1.00 Specific Gravity Apparatus, Jackson, for the true determination of the specific gravity of cement. Consists of a special burette with bulb and stopcock and a special flask with ground in funnel stopper of exactly the same bore as the burette. As described in the Journal of the Society of Chemical Industry 15 June, 19045 No.l; Vols XXGIm... . .saee- sees See eee 6.00 Extra Flask, only, for use with above: : oc. coc. cies seni enone bees eee eh e OL LEE EEEee 2.00 SPECTROSCOPES, SPECTROGRAPHS, SPECTROPHOTOMETERS AND ACCESSORIES Spectroscope, Direct Vision, poc ket form, 90 mm long, with adjustable slit. In case............ 10.00 “same as above but with comparison prism and illumi- sui Syayacs taSavaca as dee le a ocaze’ sv Sus hae va nave forenr PES crak Ot IST TOS eT 14.50 nating mirror... No. 46808 No. 46812 Spectroscope, with adjustable telescope, adjustable slit and metal cover for the prism, with objective 15 mm diameter. Dutyphree sera ee ar eee cose”. Stock. <-) ..00:i0.1. et Shae eee 35.00 Spectroscope, with cylindrical cover for the prism (illustration shows same removed) with telescope, 20 mm objective and scale tube. Slit adjustable by micrometer screw. With comparison prism. DutysRreeenres een eee 45.00 Stock 22 22).6...09:5 ls eee 60.00 492 46820. 46824. 46828. 46832. No. 46816 FRANZ SCHMIDT s HAENSGH FRAI No. 46816 with Test Tube Holder No. 46832 Optical Plan of No. 46824 Spectroscope, Vogel, Direct Vision, Schmidt & Haensch, total length 170 mm. With comparison prism, illuminating mirror, holder for small test tubes and six extra test tubes. In case. uty Rree as oe oor Roe wae cede 13.65 Stocker ere oe eters 18.20 Stand for Direct Vision Spectroscopes, especially No. 46816, with absorption trough............. 6.00 Spectroscope, Martens, Direct Vision, Schmidt & Haensch, with comparison prism and wave length scale. A rotating disc with lenses of different foci after Martens permits the accurate adjustment of the telescope for any eye. The diagram above illustrates the operation of this spectroscope when used without illuminating device which is only necessar , with very weak spectra and which may be operated by three cells of dry battery. In case. DutygEree eh ek oc Poe ae eae zoeeU). Duty Paid.... Se) Sy WOR AG omen eS ial 1) Spectroscope, same as above but with the addition of Beckmann electric lighting arrangement with special cap for comparison prism, without accumulator. Duty Frees. 2 ee ices 41.70 Duty, Paidie. ace ceo 55.60 Stand for Direct Vision Spectroscopes, particularly designed for Martens Wave Length Spectroscopes No. 46824 consisting of support, mirror glass, stage, clamp for spectroscope, absorption trough and absorption tube, with polished wooden case taking both spectroscope and support. Duty Free 21.45 Duty Rade seer oc ciency. 2500 493 46836. 46840. length for different readings. hairs; with flint glass prism of Jena glass No. 0.102 N, = 1.649, dispersion C — F = 1° 65’, face 28 x 31 mm, photographie scale and mirror for illuminating slit. This instrument may be used for a great variety of work in connection with studies in both emissions and absorption spectra, spectraphotometry, ete., and with the camera listed below. Duty Free ne ean 121.05 DutysBaid: .. ... See ee . 161.50 No. 46856 No. 46844 46844. Spectroscope, Hoffman, Direct Vision, Schmidt & Haensch, large model, with micrometer adjustment for telescope tube permitting same to move over the entire spectrum, with direct vision prism of dispersion C. — F = 5°30’, telescope objective of 200 mm focus, adjustable slit with comparison prism, one ocular of 28 mm focus, with cross hairs, illuminated by prism inside, and one ocular of 11mm focus with pointer scale, telescope with rotating scale and mirror for illumination of same. Suitable for general chemical analyses, wavelength determinations and for the securing of light of a given wavelength for other optical purposes as in spectrophotometry, etc. 75 DutysFreee ee ee ae 119. Duty, Paid:: .23)4....-26eee eee. 160.00 46848. Rutherford Prism, with mounting, dispersion C — F = 3°26’. For use with Nos. 46840 and 46844. Duty Breese. eee ee oe eee 15.00 Duty Paid:...;...- So: 2 eee 20.00 46852. Wavelength Scale for use with Rutherford prism. For use with Nos. 46840 and 46844. Duty Frees. ee ee eee 9.60 Duty Paidjicss56 2 te eee 12.80 46856. Photographic Camera tor 6x9 cm plates, with achromatic objective of 260 mm, camera tube and plate holder for photography of visible spectra only but can be adapted with quartz lens, uranium glass plate, etc., at an extra charge, for the ultra violet. For use with Nos. 46840 and) 468445 (Duty Preessece coe eeceen 86.25 Duty Paid: c30.60000 cee 115.00 WW AMILGER L®. Connon No. 46860 46860. Wavelength Spectrometer, Hilger Constant Deviation Type. This instrument, since first introduced in 1904, has been found useful for a great variety of purposes. The outfits here listed are those rec ommended for general spectrum analysis, spectrophotometry, (in combination with Nutting photometer) and quantitative estimation of colored salts, dyes and organic substances possessing suitable absorption bands when in solution. Accessories for the infra-red and spectrum ob- servations of Zeeman effect are also supplied on special order and are fully described in the Hilger catalogue which will be sent upon application. The prism is of the ‘‘constant deviation”’ type. The telescope and collimator are both rigidly fixed, since to pass through the spectrum it is only necessary to rotate the prism; and as a result a construction is arrived at which is at once extremely convenient and mechanically sound. The table on which the prism stands is rotated by means of a fine steel screw, the point of which pushes against a projecting arm on the prism table. To the screw is fixed a drum on which the wavelengths of the line under observation are read off direct as indicated by the index which runs in a helical slot. In the most recent instruments this index is on the side of the drum towards the eye; so that the wavelengths of lines can be read off without quitting the eyepiece. The point of the micrometer screw is of hardened steel, and is permanently fixed before the screw thread is cut, to avoid the risk of periodic errors, the point forming one of the centers while the screw thread is being cut. This hardened steel point presses against a steel plug in the above mentioned projecting arm of the prism table, itself flint-hard and optically polished. The telescope and collimator are both rigidly fixed to the cast-iron base, and the whole is screwed to a strong cast-iron tripod. The object glasses of both telescope and collimator are of 11; inches (285 mm) focal length, and 1} inches (813 mm) clear aperture. The focussing of the telescope is obtained by the milled ring, which can be seen in the figure on the body of the telescope. By the turning of this ring the object glass is made to move by a carefully protected helical mechanism, the eyepiece remaining dimers fixed. By this means a more accurate focussing adjustment is obtained, without the liability to a sideway shift of the lines due to the focussing, which it is impossible to entirely avoid in the olderform. With prism of 1.65 refractive index Duty Free Duty Paid for D, accurately calibrated from 385un to SOOup..................... 135.00 185.00 46864. Wavelength Spectrometer, Hilger, exactly as above, but with denser prism, i.e.. 1.74 refractive index for D, and correspondingly increased accu- racy of calibration, being from 390upy to 800uu...................-200-- 149.85 205.35 46868. Universal Base attached to either of above. For detailed description of UNI VErBalls DASEISCERINO F4C90GE fees tiie cial toe ee ee ee eee 10.00 13.70 AGS wErOLeching, COverstor Prism table jaacs ona aes eee ee ete nls se NCR emer 2.84 3.90 AGS (A -mmee VEVOLIN EY SCLEWS etek tee aere claire ciate eee eae eee eee tee 5.00 6.85 46876. Case, with lock and key, for either of above................0cceccseeeceseees 7.70 10.55 46880. Extra High-Power Eyepiece with its own zero adjusting cross-hairs......... 59.40 81.40 46884. Shutter Eyepiece with lateral adjustment to bright pointer.. 21.60 29.60 46888. Slide with light filters to the shutter eyepiece for giving the pointer. any ‘desired color, by means of which an increase of accuracy and comfort in reading can be secured, especially in the violet part of the spectrum.......... 6.75 9.25 Note—This eyepiece has two shutters which can be shifted from either side in the focal plane so as to cover any desired part of the field, thereby observing any bright lines which, by their proximity prevent the observation of feebler lines. The metal pointer, the extremity of which is ground exceedingly fine and polished bright with the greatest care, is illuminated from above by a mirror. This bright pointer is adjustable laterally by the two milled head screws below, so that one can always return to the standard by setting the bright pointer on a reference line. 46892. 46896. 46900. 46904. 46908. 46912. 46916. 46920. 46924. ENTERED ATSTATIONERS HALL No. 46860 Hilger Wavelength Spectrometer with Camera No. 46892 Attached Camera, with 21-inch focus lens, tilting adjustment for accurately focussing the whole spectrum, and shutter for exposure. | Dutytbree ss. cccrismccecee a 35.90 Duty'Paid |... 5 cosa. eeeakc see eee 49.20 Telescope fixed to side of the camera, and internal mirror with external milled head by means of which the spectrum can be reflected into the telescope for observation immediately before photography. Dutyghreewe-broeiecesce eee 54.00 Duty Paid). 5s. Sicivses cock neon 74.00 Replica of Rowland Diffraction Grating, interchangeable with the prism. Only supplied if ordered with the Spectrometer. Price includes calibration in wavelengths for both prism and grating. Dutyshreeeig sc cs kseeee 59.55 Duty: Paid): d.2)2 shine ane eect eee 81.60 Apochromatic Triple Object Glasses. In place of the usual achromatic doublet object glasses extra. Duty Breet aseseeaees eee 35.10 Duty Paid 48.10 VASILCER cee ONAN Hilger Wavelength Spectrometer with Universal Base and Nutting Polarisation Photometer Attachment in position and Stand for two parallel beams of light Wavelength Spectrometer, Hilger Constant Deviation Type, with Universal Base, in which the base plate and tripod are of the form shown, the tripod being heavier and larger than in the ordinary Wavelength Spectrometer and the base-plate having : anextended arm. The base- plate is drilled with all necessary holes for the addition of the Nutting Photometer. The Universal Base also provides for the attachment of the complete accessories for high resolving power (Michelson echelon, Lummer-Gehrcke plate, and Fabry-Perot etalon). W ith prism of’ 1.65 refractive index for D, and Universal Base. Duty Rreeaancceeomeeac 143.10 Duty Paids... (:..2, 002: 0.405. cee eee 196.10 Wavelength Spectrometer, Hilger, with Universal nie as above, but with Duty Free Duty Paid denser prism, i. e., 1.74 refractive index for D.. sua uurarde areratsis ane 157.95 216.45 Case, with lock and keyautoriertheriofsaboversa. ceases eae 10.15 13.90 Nutting Polarisation Photometer Attachment, particularly de »signed for attachment to the Hilger Wave- length Spectrometer with Universal Base, as above listed. The combination results in a Spec- trophotometer for the visible spectrum accurate as regards wavelength and photometric measure- ments. The circle is divided both in densities and degrees. The price includes an arrangement on separate stand for producing two parallel beams of light, by which means, together with an adjustment on the photometer itself, the correct conditions of illumination may be secured with two columns of liquid of any desired length. Dutyreese ee ee melo 20) Duty: Baid scsi 5 .cue eee eee 244.20 Nutting Photometer Attachment, as above but on separate stand with lowell Duty Free Duty Paid screws, suitable for use with any ordinary Spectroscope.. BGs, Sea dies 179.55 246.05 Stand for Tubes of Absorbing Liquids, such as Baly tubes, Ck Cae ati 14.85 20.35 496 No. 46928 46928. Spectroscope, Kriiss Universal, for quantitative and qualitative analysis, spectro-photometry, etc. Large model with flint glasspprism of 60° and triple Rutherford prism, providing a great range of dispersion. Micrometer adjustment for observation telescope, ete. Equipped for qual- itative analysis with simple micrometer slit, with divided drum and platinum edges, comparison prism and lamp for illumination of scale. Equipped for quantitative analysis and photometry with micrometer double slit. with two divided drums after Vierordt, adjustable eye-piece, ab- sorption vessel with parallel walls, Schultz’s cell, micrometer support and observation lamp. With two unsymmetrical slits. Dutyebree er ec es ees 157.50 DutyzPaid secs see ae he tee 210.00 46932. Spectroscope, Kriiss Universal, exactly same as above but with two symmetrical slits Duty Eree:.o osc sauce shee se 190.50 DutytPaidec secre cs seca 254.00 R.FUESS, || ||| STFGLITZ- BERLIN No. 46936 No. 46944 46936. Spectrograph, Fuess, Gehrke and Reichenheim, as used at the Physikalisch-Technische Reichsanstalt. With optical system of quartz for investigations of the ultra-violet. For photographic plates 62 x 9 em. A small compact instrument which has been supplied to many leading chemical and physical laboratories in Europe and America. Complete with extra large Cornu prism. DutysRreess. sk Gases: cao 142.50 Duty Paid! seo eee enc ewe 190.00 46940. .Spectrograph, Fuess, identical with above but with glass lenses and two dense flint glass prisms Ny = 1.75 for investigations of visible spectra. DutyiPrees 2 565 iss a eee .. 120.00 DuatyPaids bones: scenes snc eelee 160.00 46944, Spectrograph, Hilger, for the Ultra-Violet, with optical system of Uviol glass. Recommended as an inexpensive outfit for ultra violet work, having been used very successfully for experiments in blood, absorption spectra, etc. Each instrument is sent out in complete adjustment ready for photographs to be taken. Specimen photographs sent on application. With two prisms and lenses of the most transparent ultra-violet glass, the lenses of 8 inch (203 mm) focus, the spec- trum from 300 pz to 800 zu, about 40 mm in length. Size of plate 4} by 3 inches. ty ECG ite aac cisions sieieisc covsereiciecw 89.10 Dutyzhaidre jasc ateca veces 122.10 497 > 46948. 46952. 46956. 46960. 46968. No. 46948 Spectrograph, Hilger, for the Ultra- Violet, Size C, with quartz optical system; designed to be in permanent adjustment; to give the whole spectrum from 200 pu to 800 uu on one plate; to give good definition over the whole spectrum on the ordinary photographic plate and to give as large an amount of light as is consistent with the above conditions, thus enabling spectrograms to be taken with relatively short exposures. The instruments are sent out completely adjusted, ready for photo- graphs to be taken. Specimen photographs will be sent on application. With lenses of 24inches (610 mm) focus, the instrument giving aspectrum from 210 uu to 800 wu of about 200 mm in length; prism 41 mm high by 65 mm length of face; size of plate 10 x 4 inches; with No. 2 Slit. The dis- persing system consists cf one Cornu prism. There is a vertical motion by rack and pinion to the dark slide, with scale, whereby a number of exposures can be taken one below the other. Duty dhnee vonssecccctses Seo eae 317.25 Duty, Paid 2c. 434.75 Wavelength Scale for above Spectrograph mounted internally in such a manner as to be brought at will in contact with the photographic plate. [Illumination is provided by means of a small electric lamp, and a contact print of the wavelength scale can thus be obtained on the same plate as, and in juxtaposition to, the photograph of the spectrum. The above Quartz Spectro- graph in connection with the wavelength scale is widely used for experiments in the absorp- tion of light of complex chemical substances and in the study of molecular constitution. If desired the scales can be divided to read frequencies instead of wavelengths, the price being the same. Price applies only if ordered with Size C Spectrograph, including small battery in case with push key for illuminating lamp; the whole being attached to the Spectrograph in a con- venient position for use. IDtityaE ree) hse cce eke eae 70.20 Duty: Paid. eee 96.20 Wavelength Scale on Glass, for above Spectrograph. These scales are photographed on glass and can be laid direct on the spectrograms to read off the wavelengths. They are prepared to suit each individual instrument and are sufficiently accurate to determine the identity of most lines. ID UtypP ree saree ee etercisieusi 8.10 Duty Paid.:..........3 eee 11.10 Metal Slides for the Plate-holder for above Spectrograph, same being attached to the base of the instrument by a rigid metal bracket. In this construction the wooden cone and bellows of the camera are still retained, but play no part in the support of any essential portions of the apparatus. Duty Free see 94.00) Duty Paid... se eee 129.50 36964. Sector Photometer, Hilger, for Quantitative Spectro- Photometry in the Ultra-Violet in connection with the Hilger Ultra-Violet Spectrograph SizeC. With wavelength scale by the measurements of the actual proportion of each wavelength absorbed in its passage through the substance or for some function of it, as for instance the absorption constant. The great interest which the measurement of selective absorption has assumed for the chemist will be noted from the extensive bibliography concerning the chemical significance of the absorption spectra of organic compounds and rare earths. Much of this work has been unsatisfactory because it has not been of a quantitative character. The Sector Photometer consists of a slit and a bi-prism which receives the light from the solution through the sub- stance to be examined and the rotating sector so that two spectrum photographs are obtained in close juxtaposition, one of which is of reduced density throughout its whole length and the other No. 46964 —that which has passed through the material under test—being more dense that the first in certain parts and less so in others, there being certain wavelengths where the density of the two is equal. Spectrum photographs and more complete description, with complete bibliography, will be sent upon application. With motor for either 110 or 220 volt circuit. Voltage must be specified in ordering. Duty; Freeis-eon enee 145.80 Duty Paid... 2322 eee 199.80 Tubes, with quartz ends, for solutions, length of liquid 10, 20 or 40 mm. Duty Preeseachs eee eee 4.05 Duty) Paid; each)>). 2+ eee ars > R ce rae (S ye) SS co | rae, e} = > Wn fa) e) = a) > Zz ~< KA v MHUNGER: JENA. No. 46970 SPECTROSCOPE, GRATING, ZEISS, primarily designed for the analysis of absorption spectra but applicable 46970. at the same time to the study of emission spectra. In grating spectra the wavelength for any line of the spectrum is proportional to the corresponding angle of deflection, and this property has been made a means of dividing the head of the micrometer screw by which the telescope is moved through the spec- trum in terms of wavelengths. Using none but the most perfect gratings, Zeiss have been enabled by the excellent definition of the spectra to depart from the usual division in terms of uz or millionths of a millimeter and have divided the drum into units which are ten times finer, i.e. into Angstrom units (1 A. = 0.1 wu). The Fraunhofer lines of the solar spectrum can accordingly be set accurately to within 1-2 A. For sharply focusing the spectrum with respect to the cross lines in the telescope the collimator is very rigidly mounted and fitted for this purpose with a milled ring. ‘ The slit, which is of the highest order of precision, moves symmetrically and can be adjusted during observations by means of a wheel and cord transmission gear. The jaws of the slit are protected from the access of dust and accidental injury by a detachable glazed cap, the latter being interchangeable with a similar cap fitted with a comparison prism. Each division of the slit drum, which has one hundred divisions, changes the width of the slit by an amount equal to 0.01 mm. When the instrument is applied to the analysis of absorption spectra the absorption bands are much more clearly defined owing to the comparatively small dispersion of the grating, which contributes greatly to the accuracy with which it can be adjusted with respect to the cross lines. his renders the instrument particularly well adapted for the spectroscopic analysis of pigments by Formdnek’s method. To render the cross lines clearly visible in the presence of very dark absorption bands the telescope is fitted with a convenient device for illuminating the cross lines, which entirely fulfils the purpose of the arrangement recommended by Formanek, though it differs from it in the means adopted by Zeiss. The most suitable source of light is a Nernst lamp with exposed glower, i.e. a glower not sur- rounded by a heating spiral, an image of the glower in its natural size being projected upon the slit by means of a condenser lens. With this source of light the slit should as a rule be reduced to a width of 0.02 to 0.03 mm. An inverted incandescent gas burner supported on a stand and provided with screen is equally convenient to manipulate, though it gives a less intense light than the Nernst lamp. Spark spectra and are spectra are examined by projecting with the aid of a converging lens an image of the radiant upon the jaws of the slit, which for this purpose are lacquered white. Care should be taken to insure that the exit pupil of the telescope may be completely filled with light. This may be ascertained by viewing the small bright circle in front of the eyepiece witha magnifier. See F. Lowe, Zertschr. f. Instrumentenkunde 1908, 28 S. 261; or J Formdanek “‘Untersuchung und Nachweis organischer Farbstoffe auf spectroskopischem Wege,’’ II Auflage, Berlin 1908, or ‘‘Die qualitative Spektralanalyze anorganischer und organisher Kérper’’ It Auflage. Grating Spectroscope, as above, with transmission grating, protecting cap for the slit, comparison prism, reader for the micrometer screw and two interchangeable eyepieces of different foci, in case with lock and key. Duty Free....... : 200.00 DutysPaideec. case ae tieisieto reve 272.00 499 46972. 46974. 46976. 46982. 46984. 46988. 46990. 46992. No. 46972 No. 46974 Monochromator, for Visible Rays, Fuess. Convenient as a source of homogeneous light for spectrometers, refractometers, polariscopes, microscopes, goniometers, etc. Illustration shows same in position before the collimator tube of a spectrometer. With two flint prisms ny = 1.67, and with two Ramsden oculars with cross hairs. See E. A. Wiilfing, Tschermak’s Mineral u. petrogr. Mitt., 15, S. 74; ferner: C. Leiss, Zeitschr. f. Instr. Kunde, 18, S. 209; ferner: C. Leiss, Die opt. Instr., S. 25, Fig. 19-21. Duty Free- og... 455 eee eee 162.90 Duty Paid... 3.36.40. = eee 217.20 Spectroscope, Autocollimation, Zeiss. Light reaches one-half of the slit through the window at F, while a similar window on the left admits light to the other half of the slit, and thence passes through the objective O to the prism P, where it is reflected back from one of the silvered faces and in the focal plane of the objective O produces a spectrum which can be passed through the field of view of the fixed telescope by turning the screw head M. The arrangement of the two windows furnished a convenient means of comparing two spectra. Wavelengths can be accurately measured within a fraction of a uz by reference to spectrum lines of known wavelengths, while for the identification of the various regions of the spectrum a dispersion curve is furnished with the double Rutherford prism. With double Rutherford prism and dispersion curve. Duty: Rrees2.c hee eo eere 185.00 Duty. Paid......... 2o4.c.cee bee 251.60 Prism of 30°, on silvered back with metal stage, for use interchangeably with Rutherford prism. Duty Free... ..255 eee nies Bee ai) Duty Paid...o: 52. 5 tose 11.22 46980. Spectrograph with Divided Circle, Zeiss, consisting of the Autocollimation Spec- troscope above, with metal camera with arrangement for ten exposures on one plate and a base plate for the prism for automatically obtaining the minimum deviation. The objectives are inserted as far as they will go by which means the Spectrograph is focused and ready for exposure. Witha6x9cm plate holder, No. 46980 but without objectives and prisms. Duty Free.. 206.25 Duty Paid.. 280.50 Pair of Achromatic Objectives, f = 250 mm, with fittings to slide into the collimator and camera. Duty/Preem. 6 eee ee 15.00 Duty Paid)::. ac... <-e ee eee 20.40 Pair of Double Quartz-Fluorite Achromatic Objectives, f = 250 mm, for use in the ultra-violet. Dutyzbreess eo eee eee 47.50 Duty Paid: 3224 . 2a ee 64.60 Rutherford Prism, on base plate. Duty Free............... 25.00 Duty Paid eee 34.00 Cornu Double Prism, on base plate. Duty Free............ 22.50 Duty Paid 553. 2-eeeeee 30.60 Condenser, with quartz lens, on stand. Duty Free......... 18.75 Duty, Paid: : 2.2 22eee eee 25.50 500 EEE > v9) 46994. 46996. 46998. 47000. 47002. 47004. HS SUS H. Takia sOe Me AS TS CaO} Me SEAS Ni aay. No. 46994 No. 46996 Monochromatic flluminator, for the Ultra-Violet Light and Visible Rays, Hilger, reading from 200uu to 700un in direct wavelengths. This instrument is particularly suitable for experiments on the photo electric effect, ete. The collimator and telescope both have symmetrical slits with divided drum heads for width adjustment of the jaws which have an effective length of 20 mm. The lenses are of 31 mm aperture and 210 mm focal length for X= 300uu. The beam of light from the collimator passes at minimum angle through a Cornu prism of quartz (height 32 mm, length of face 42 mm) and is then reflected from a plane mirror into the telescope. The prism and mirror stand on one table, which is rotated by means of a fine steel screw, the wavelength of the portion of the spectrum under observation being read off direct on a helical drum. The average accuracy of reading throughout the range is to about luz. The collimator and telescope are rigidly fixed to the cast-iron base. Duty hree se eee eee eee 279.18 Duty HB aid: Fi SUI SR Wale Ter =O) eM!) VA 7S CO) Mi See Ag NEY: Mutyehree 2 sca. os cits ke natin bes 21.00 Duty: Pads stcoss sions cate eioeae 28.00 MERCURY VAPOR ARC LAMP OF QUARTZ, HERAEUS. On 220 volt lines the lamp may be burned at all potentials between the electrodes from 25 to 185 volts by means of a variable resistance of 55 or 95 ohms (depending on the type of lamp) connected in series; on 110 volt lines at all potentials from 25 to 80 by means of a variable resistance of 25 or 40 ohms. If the lamp is not required to burn at low voltages resistances of 30 or 50 ohms and of 12 or 20 ohms are sufficient. The specific intensity of the visible and ultra-violet radiation is the same, and the economy equally as good in 110 volt as in 220 volt lamps. The mercury vapor arc is extremely rich in ultra-violet rays and quartz glass is transparent for such rays above 185 yu wave-length. See article in the ““Annalen der Physik,” 4th Series, Vol. 20, 1906, by Dr. R. Ktich and T. Retschinsky on Photometric and spectro-photometric measurements in the high pressure mercury vapor lamp. For 220 volts, direct current, 12cm arc. 8} amp. current consumption and 3000 c. p. WIRE. ATT, Gorn GS Cn Ail See couckenans ended Sse seeds 68 OU Osdde So deebe DS eanoccnns cos onemmco noc 145.00 47056. Rheostat, adjustable series, large, 55 ohms....................-.--.+-+++- Le ne it, BAER 6 15.00 47060. a o (eesmall ao0;ohma span eree crete era cries. 2 amp. current consumption and 1500 ¢. p. 47064. Lamp, complete on stand............ pe a ast Oat orcas rE eo ee nce ce Pe Rin ner Perr 125.00 AZ0GS. Rheostat, adjustable series; large, 95:ohMS.......- 2. ei cn cae ews ce we he ele eee eee serene 10.65 47072. ss fe Oo Srl SOG disses nccoadaccu on Snuccdoseduearenon sqnnonbopceanecnoe 8.50 For 110 volts, direct current, 7 cm arc. 33 amp. current consumption and 1500 ec. p. iG, “Wins comin Gime tip beasogscesssedcs “coccosoooconuaccosaseeeecr ood aso rEreApoooodoclnoeooer 125.00 47080 eee kheostat, adqustable series, large, 1251 OMS eres ey = ——— ne 4 7352 yarns = = 6. =e | alle 1 = oe No. 47420 Th tt inn in if in Weene — wad WT No. 47396 No. 47400 cs ae No. 47412 47348. Sputum Dish, for sputum examinations, of glass, with bottom divided into three sections, one being transparent, one of milk glass and one of black glass. On metal frame with mirror underneath for reflecting light. DitysRrees Pico soe betemsrieis sees 10.00 Duty Paid pic ssee ceeaatere meses 14.50 47352. Staining Dishes, of glass, for staining specimens on the slide, with loose fitting cover and grooves to keep slides in place. Inside dimensions are 75 x 58 mm so that slides of varying widths may be 25 lnFniaell exo lae eins nics cocks Oo 00 OGD On oo ator TTC On OO COR DT Ome non cae ene iictomen teotroecic tn mac 47356. Staining Dishes, Moore, of glass, for staining, dehydrating, etc., consisting of a double dish 100 mm in diameter by 30 mm deep, with parallel slots...............--++-1eeses tsetse sees 75 47360. Staining Dish, of glass, for staining specimens on the slide, consisting of a rectangular glass box with cover, a remov able tray and a nickel spring wire holder for jlitting tray out of staining solution in box. Will take slides 3 x 1 inches, 3 x 12 inches and 3 x 2 inches. Complete with glass dish HOODOO Tare Huavel Gyatine loClR, 5S wna kbodobesnooodeddonesbocetogsdeaonspaonousognoououeTD 47364. GIASSHDISh om ly tere eee eee ee cree INN coe on a teen sey A/cvnic. orenersebsicass transl uacterar syateerene ep 47368. GP AN EVA Con A iso alo cai Cecrdsiel co IRIEL Goin DR MIO ERIE aG or aote Oe Enon Pari in Sis cle Creche ec 65 47372. INickelG@Wiire sh ol derionll ype gary tates ice repre ey ol cares rete ened oN ys cel Sscegs Felaacueye = iotegearnovores steve -10 47376. Staining Dish of glazed ORCS, lony Hora, far 8) 5s WalbGlS. oc 450 cosacpenaqoansecvecseneseoesc -80 47380. s for 3 x 1} slides.. OF LIES REED oe eect Lo. 47384. Staining Jar, with loose cover and bottom polished; ‘size ‘85. x 35> mol SR NTTIE cea. Se eee ee 47388. “ Coplin, of heavy glass, with ground on cover, for convenient manipulation of sections attached to slides; very economical of reagents; capacity ten 3x 1 slides. Each wacr eco Per gross. . 25.00 47392. Staining Jar, so-called ‘‘Naples Jar,’’ with loose fitting hemispherical cover; size 90 x 35 mm. -20 47396. ““ same as above but with cork stopper and without cover...............-......+-+: 15 47400. Staining Jar, Hellendahl, with eight compartments each of which will take two 3 x 1 slides at one time when placed back to back; very economical of solution, with cover................-+2..5-+- 1.00 AAA SCAMIN gH arora LOnm awilbhicOveTrasorK;4o)xelOmmmmenvyer) n 4 ae; (= yo) 0 =) ae OF Me yAges GUO} IMR eA Ninny cope A 05. 75805% No. 47756 47756. Syringe, Sub-Q Safety, for bacteriological and serological work. A very satisfactory glass syringe at low price. With a piston of black glass and safety device preventing the loosening of the as- bestos packing and the larger sizes have ring handle. ‘The needles are attached by screw thread except in the larger sizes which have a flexible coupling. Price includes leather case and two steel needles. WapacitivenGCen moe cbr: 2 4 6 12 20 50_ 100 Each MS shone naateepencbstccs ietote ioachvasemlcrs 125 1.50 1.75 2.00 2.50 5.00 7.50 47760. No. 47764 Syringe, Roux, for bacteriological and serological work, as used in the Pasteur Institute of Paris ; original French make; widely in Pasteur treatment and for tuberculin injections in veterinary practice. Wap acliy mec wacs: uct meee epee tener coor ate : 5 10 20 50 100 47764. Syringe, only, without needles or case................. 2.80 3.60 5.60 8.80 11.20 47765. Syringe in case with two steel needles............ me 6.00 7.20 10.00 14.06 20.00 47766. Extrasslassiparrel Sipser cee een eee 30 30 40 80 1.20 47767. AMDISLONS ene reyes CL ret eee ree 20 -20 -20 40 -60 47768. } Ga ess \ Ii | Hl 1 i TI og. | Wet HN | li | I Mes i | — at Mi) i : | HI I Wi i} | a j AM aE i a pa @ Nos. 47840 and 47844 No. 47824 with parts dismounted SYRINGE, REFORM. The distinctive feature of this syringe is the entire absence of metallic solder of any 47824. 47828. 47832. 47836. kind. The glass barrels are ground to fit the metal parts and the syringe may be dismantled for cleaning, or the replacement of the glass barrel and immediately reassembled. As each glass barrel is individually ground to its accompanying piston, it is necessary in ordering new glass barrels to order a piston fitted to each. These are kept in stock as per price list below and glass barrel with fitted piston may be used with any Reform syringe of the same capacity. Gap aelbiys (CC. caysecyeisaecch cto pcectetetorsesis(eeote es essteies aici oisvejo Oe telaictars 1 2 5 10 20 Syringe, only without case or needles................. 2.40 2.85 4.40 5.20 6.20 Syringe, in metal case with two steel needles.......... 3.20 3.80 5.60 6.60 8.00 Syringe, ‘“ ‘ i «« “ Dlatinum-iridium needles 5.25 6.20 9.00 11.00 14.40 Glass Barrel with piston ground in to fit.............. 1.40 1.80 2.20 3.20 4.00 Sizes of needles regularly furnished................... 2Hlés Hi&l2 S1&4 S1&4 S1&4 NEEDLES, FOR THE RECORD, RECORD-BRUNEAU AND REFORM SYRINGES. The letter ‘‘S’’ refers to 47840. 47844. the needles from the serum group of sizes and ‘‘H”’’ refers to the regular hypodermic series. Prices of platinum-iridium needles are subject to market fluctuations. Siete RSS ep rate en oe S1 $2 S83 S4 Hil H2 H12 Hl6 His H20 Steel, Needles each.......... Bes Se ae 20 #20 218) 218310) LO 10 LOO es «per ’dozen....-5..--- 52sec eee See) 2:25) 115) 1275) 100" 1200) 1-00) 00 maou maton Platinum-iridium Needles, each.......... 3.35 2:75 1.60 1.65 1.40 1.15 2:15 -65) <60ieee0 518 r’* No. 47848 20cc. size No. 47848 lec. size No. 47852 Syringe, Luer, for bacteriological and serological work; an all glass, aseptic syringe with slip-on needles, American make. Considered by many to be superior to the original French make. CPapAacltysCOiasseraa csi oneness Berea wineeeicl Maes 5 10 20 Graduatedsiny, CG: ade cc siie conc oss hey mic isle o ace eerie rene SF 5 3 1 47848. Luer Syringe, only, without needles or metal case.............. 1.75 2.25 3.00 4.50 47852. Luer Syringe, with metal case and two steel needles............ 2.75 3.50 4.50 6.00 47856. Luer Syringe, with metal case and two platino-iridium needles. 3.75 6.00 7.00 8.50 Menpthyinchestrencaen cece. er 47860. Steel Needles, per dozen.......... 47864. Platino-iridium Needles, per dozen No. 47868 No. 47880 No. 47876 47868. Syringe, for injecting in veins and arteries, each with three canulae, with stopcock, nickel plated. @apacrtiyerce es sas eer tere eae ieee aie ae renee 50 100 150 200 LOE Nes aidhor eas bes EU eS OCR ORE ROCCO eee Se DEO a CE eee 3.50 8.25 9.50 11.00 47872. Syringe, or Aspirator, Record, 100 ce capacity as used by manufacturers of biological products for injecting live bacteria into horses, etc. Complete in case with 3-way cock, 2 connecting tubes with metallic connections for same, 2 long steel canulae, 1 trocar, 1 conical tubulation for direct attachment of the canulae and 1 olive form tubulation...................00eeee eee eee eee 21.60 47876. Syringe, same as above, with 2 canulae and 3-way cock, but without needles, trocars, tubes or case. (P@apacity Meche wees coterie esate creiols elevate els Mei atssne kare Bice e ale sieve Aces tarogls 50 100 101 36 Gao OHO GOA IBAOT TO 0.06 CODE CEASE EET ORES: GRID SH nad Gan Ane e neraas 10.00 U25 47880. Syringe, Record Universal, for infusions, injections, punctures and aspiration, consisting of a 10 cc Record Syringe with three finger rings, attachable ventilating head, 3-way cock, needle connec- tion, steel needles for serum and other subcutaneous injections, puncture canula, infusion canulae, tubing with metallic connections, long tube for injections in connection with ventilating head. WomipleteMyCasenere reheat eee ease are rae sae A SET ree ice ees 14.50 47884. Syringe, Record Universal, same as above but without attachable ventilating head, needle connection, MEE MILER LU DES TOLICASE sa tseobccaisius ola sve cisiavs ete cleval sta sails ators Ghoiat otras edie eae isis eyes tabs ota sti enero ee 8.00 a No. 47888 No. 47892 No. 47896 No. 47900 No. 47908 No. 47912 No. 47916 No. 47920 No. 47924 No. 47932 47888. Test Glasses, for collecting sediment, conical form, with foot and spout. (Choline CE. ncscusonocderae ce SOEs fy ae 380 50 100, 200. 300 1 OEY eLetters etch eae es rears eee eer erie : 15 15 20 -30 +35 47892. Test Glasses, same as above, gr aduated. Capacity cee eee omer ier hie errr tote creer 305 50 100 zi 300 JOEY (Weis, 5 iMate Oae nese Gta ain Seana ir tae oi 40 45 507 75 1.00 47896. Test Glass, cy ‘lindrical form, Suy denham 1 Hospital model; height 240 mm, diameter 40 mm, capacity 180 ce; with blunt conical bottom... .....s<.c0ss: meses lsu -40 47900. Test Glass, tall conical form, with blunt bottom, 200 ce capacity, 20 cm high, with spout........ 25 47904. Test Glasses, lecture table form, with spout. Capacity cOe.cs ca2aa tien aster eet teeehieitie ie ersiane nave duals SSSR ate OT Ree eee Oe Eee Teleom 250 LOE Rater cre A ere Meee ne IO er nD SARE oe Ate acon otiGuoue cc s.s 25 -40 47908. Test Glasses, low wide form with broad flattened bottom instead of point as in No. 47888; convenient for cleaning or for crushing crystals with glass rod; with spout. Capacity ees hres sterner oe eric Se dsb hc ee Oe 50100 250 BRC es povcpcls tate cics severe RIE Le eePeRe ors tis eel orsembca are eis ¢- cme eRe 18 25 -40 47912. Test Tubes, with side neck and lip. Dern gt hres eer coon since loge sees vce. sateage Heke euccetesnfe,cicuake poaterebebacs 120 150 180 200 Ba chinsttee hte fier tot aatoeiclyaartin oa ie out chnensrinarcis oe eee eA 05 06 10 12 47916. Test Tubes, with lip and foot. eich simmaa cers voce ecietoc eee _ 100 125 150 175 200, 250 ACh ere Por oi one eae 07 .08 10 12 15 20 47920. Test Tubes, graduated, with lip and foot. @S pacity ACC. eccrine serine he Ae ee inneri oe Sree Ree AR Eee mere 5 15 25 (Gee UCN Ae\ Unb 0 heel Onn ere eer nc ener OAR BANE halaman amo Gar aa iy. a BCH iiss payer cas calatetese si ovares acer eie isis aierei ve Monae cowie sale dele c S eae peepee eee 45 50 -60 47924. Test Tubes, graduated, with lip, but without foot. Capac ity Consecration ere wei 5 10 15 20 29 30 Graduated in, ce. Red aac to = = 7 i 3 Bach oe ee ees .30 35 40 45 A5 5 47928. Test Tubes, Opaque Fused Silica, heavy w alle with lip. engin ches teers tasrcerte recta vies s sets vere oianesete afereiatelvsare eiaeieraerhe 4 5 5) 6 6 7 Diameter, ITN CHES ery eee itt es eae rie cases heceuav SiGe oteiel Aosta 4 > 2 A 2 rs LORY) (eerceciacon:d SaOCe OOo AROCe Gen iO ts aee ree are as 85 1.00 1.20 1 45 1.75 2.25 47932. Test Tubes, Thin Wall, of Jena Fiolax Tubing. These tubes are to be identified by a black longi- tudinal stripe. This glass is easily worked with the blowpipe flame and is not to be confused with the hard or combustion tubing. It is practically alkali free and is recommended for use wherever the greatest insolubility in water, alkalies and acids is desired, as well as great resistance to sudden pe ones changes. IES s¥-ailarnuchedontra as © Satie wD dg oo aud corer OTe 100 «120 140 140 160 160 180 200 Outsideidvameter, mmm semeee ee piss ne cena SIE Gils 20. 18 20 22.25 DE Gearon aeeMmE ron Gra ods. San Susan ereonn 103% 04) 2055 R05 0S OC Ooo Pers lOO acetic eee eae serene Sacre eee 2.00 2.80 3.60 4.00 3.60 4.40 5.60 7.20 47936. Test Tubes, Thick Wall, of Jena Combustion Tubing, containing very little alkali and fairly tractable in the blowpipe flame, although as hard to fuse as the best Bohemian potash tubing. Ihengths mm)... Sass ee eee eee lOO 120 140 160 180 200 Outside diameter, mm................- 12 15 18 20 22 25 Ha chiet ces octhce one Wa ee eee -05 -07 -09 11 14 18 Perr loors cer reins fee. See eee eee 4.00 5.60 7.20 8.80 11.20 14.40 520 — | | <>) = | | -CORROS, 3 yor 0 ‘Ve Yo! J €sr TUBE? J e) No. 47940 No. 47944 No. 47948 No. 47952 No. 47956 No. 47960 No. 47964 NOTE:-We do not carry in stock test tubes made of commercial glass tubing because of the crystallization on the surface of this tubing which frequently takes place in laboratory use. The diameters of all test tubes are approximate outside diameters of the tubing. A considerable variation must be allowed for bore in the diameter of the tubing and, in the case of heavy wall test tubes, in the thickness of the wall, because of the unavoidable variation in drawing the tubing. Where test tubes must be furnished of an absolutely uniform diameter and thickness of wall they must be selected from our regular stock and a higher price charged. Prices given per 1000 apply only on orders of at least 1000 or more. All test tubes are neatly packed in cartons of 100 each. 47940. Test Tubes, Thin Wall, With Lip, of good German glass, for chemical work. hen pth moMsee ec eee ete sae ecri cies sa ea 100 120 120 120 150 150 150 200 Outsiderdiameterymm-erss2- 226 - ee ese 12 13. 1518 16 18 20 25 (Perel 00. ese erioe cette Ser tect voyoioael swine 65 .85 1.05 1.25 1.25 1.55 1.80 2.50 Beta OOO ane ee creck st cksgtoaa sicis sh annis seotaie 5.15 6.60 8.40 10.00 10.00 12.35 14.35 31.25 47944. Test Tubes, ‘‘Non-Corrosive,’’ Thin Wall, With Lip, for chemical work. These test tubes are made of a fine resistance glass and are of distinctly superior quality and workmanship, and are guar- anteed to be non-corrosive under all ordinary conditions of use. For test tubes of ordinary quality see our No. 47940. pera ge bas envy ete esa 2 fay are lope ees) econ 75 100 120 120 120 150 Outside diameter, mm.............. 11 12 sie 15 1s 16 IRSrLOO LR sek acstroos actacimes erase ees 85 1.10 1.30 1.55 1.65 1.80 Per lOO es cncs tate one ee eee 6.80 8.80 10.40 12.40 13.20 14.40 IDENYa era, ar yar tore of ona eee 150 150 150 200 200 250 Outside diameter, mm..............- 18 20 25 20 25 25 Ber 10055. jacchets Aas eee oh 11.95 2.00 3.60 3.00 4.00 5.50 Ber 1000 ssn So serace oe aor ees 5.60 16.00 28.80 24.00 32.00 44.00 47948. Test Tubes, ‘‘Non-Corrosive,’’ Thick Wall, Without Lip, for use as culture tubes in bacteriology. These tubes are guaranteed not to corrode or give off alkali after repeated sterilization in the autoclave at 120°C. They are made of a superior resistance glass of great mechanical strength and will stand an unusual amount of mechanical stress without breaking. They are standard throughout the U. S. and are specified in many important bacteriological laboratories in pref- erence to cheaper tubes. The size 150 x 16 mm is standard for most work. fen eh nin as eae eats << ois tesco. 100 100 120 120 120 150 150 # 150 QOutside’diameter) mms. 222-1 sceteela esses 12 15 13 Wh SG I BersOO SS see ccc Ao ees 1.75 2.10 2.00 2.40 2.60 2.60 2.85 3.50 Ber t000 Me oe cee ss onc ecinn aye as 13.60 16.80 16.00 19.20 20.89 20.50 22.80 35.00 47952. Test Tubes, ‘‘Non-Corrosive,”’ for Serological Work, of medium weight wall, with flat well formed lip; of resistance glass showing a minimum amount of color and of selected sizes suitable for the pur- pose above indicated. Length, mm 50 65 65 65 65 75 75 100 100 = 150 Outside diameter, mm............. 4 4 6 10 12 6 10 6 10 10 Berl0O sting) Soca ete Saves 1.00 1.00 1.00 1.25 1.25 1.10 1.25 1.25 1.30 1.40 47956. Test Tubes, of Hardest Bohemian Combustion Tubing, very heavy wall, with slight lip. Wen othr ee = ns yee eters nalts else awe Wat eee 100 125 150 200 250 Diameters eer tay: sie aetenee aie era heist cine 16 16 18 25 25 Bach pee io sere arenes Sosccick deecens ts -10 12 15 20 30 47960. Test Tubes, of Hardest Bohemian Combustion Tubing, heavy wall, with slight lip and bulb at bottom. Meret ie rein te a Pre ae os co ess LOD ae TOG E50 180 200 LET) We na SDR GAOn Ac IOccOBo DECC DD Cece OE caacc re 15 18 -20 -20 35 47964. Test Tubes, with bulb near top which tends to prevent boiling over of contents and which enables tube to be laid on the table without the contents overflowing. Length, mm..... 125 150 IDI ciel) So ieee Jee ene tae ae ee enne Aerie. Jes enor ot aON eh ad 16 18 LOG ee Ween Sone Se Rne Bat EDR DDEOCD DERE O DD aoL Onan ee Doron Obs hr enennoGac -10 12 521 IS RIK? j=, VAUX OM, NINN) IK MAINA RUE Ne. 47976 No. 47980 No. 47996 No. 47984 47968. Test Tube Baskets, cylindrical, of heavily galvanized wire, for use in incubators and sterilizers; 6 inches,high' by5)inches diameter. « Wh 2S CG -30) MDs Pe eAY aN aay GY SPOS CeY m4 Om LOOM EI — =e 3 c No. 48084 48072 48076. 48080. 48084. 48088. 48092. No. 48072 No. 48076 No. 48080 No. 48068 Test Tube Support, Weidanz, of copper, for, use in serological work; tubes supported so that reac- tion may be readily observed and each hole stamped with number. For, tubes : I Se ea Te eae Sates Barbie toe eae TR OE ee COR eae Che 10F: 1 (Ge SS AeR erate Cora ORO a NE EG a eM Sin A AR te Ok Roto oc € ‘1.75 3.00 Test Tube St of stamped steel, black paareliod! with 14 holes oi 1 inch diameter and wee [hy 0) 0 Pare ete tet ee ao os ee ene a ee MMO EEE eum Aa araGooos ccnocccc so. Test Tube Support, with spring clip; also conv ain for use with centrifuge tubes.............-- 25 eee 2 Sle abe “with ground glass plate on base for writing...........-..--. -80 Test Tube Support, Woithe, arranged especially for bacteriological and serological work, permitting the entire contents of the tube to remain in sight. The test tubes are held in place by strong spring clips making it possible to hold them at any height. For 24 test tubes; size of support 32} em long, 74 em wide and 16 em Pal the 2 3 oles ecdye'acccle a, lale wre wsnraiaya. s'eietene ate a er eee eee Test Tube Support, Woithe, similar to above but for 18 tubes so arranged that all are visible from either side of the rack, i.e., in alternating series with bottom of racks numbered...........- 1.15 Test Tube Support, Woithe, similar to above but for 96 tubes and with main support 38} em long by 19 em wide by 37 cm high and with separate support carrying each series of 12 tubes quickly de- MOUNGADIE: 2A. ele A SHE SS Sate es Sse dla oA Tn ein CaCI SOIT oe ee 7.50 524 A ee td ees) es H. ey Eig Ole Mis JAY'S CeO Me Raa Ay Ni ay TESTING APPARATUS FOR PAPER, YARNS, TEXTILES, RUBBER, LEATHER, ETC. 48096. 48100. 48104. 48108. No. 48096 No. 48104 Paper Tester, Schopper, for testing all kinds of paper as to both tearing strength in grams and as to tensile strength in both millimeters and percentage; for strips 15 x 180 mm. Stretching oF scale reads from 0 to 27 mm and from 0 to 15°. With single scale 0 to 30 kilos in 100 gram divisions. Style alae : For hand power With pulley for power driving With hydraulic motor Duty Free... 120.45 174.90 ; 150.15 Duty Paid.... 146.00 212.00 182.00 Paper Tester, as above, with double scale, 0 to 5 kilos in 10 gram divisions and 0 to 30 kilos in 100 gram divisions. Style ware For hand power With pulley for power driving With hydraulic metor Duty Free 127.05 181.50 156.75 Duty Paid 154.00 220.00 190.00 Cloth and Leather Tester, Schopper, for cloths and woven textiles of all sorts, and for leather, ete. For specimens of from 100 to 400 mm in length and 50 mm in width. With stretch scale reading in both mm and percentage. Operating on the same principle as the paper and yarn testers but specially adapted for the materials above mentioned. As supplied by us to the leather testing laboratories of the U. 8S. Bureau of Chemistry. With two scales, from 0 to 60 kilos in ?ths and 0 to 100 kilos in 3 kilos. Duty Hrees. cs: .- > ... 270.60 Duty Paid..... ee eerols00, Cloth and Leather Tester, as above, with two scales, from 0 to 130 kilos in } kilos and from 0 to 500 kilos in single kilos. small extra expense. 525 48112. 48116. 48120. 48124. No. ine hin i 0. 48112 No. 48116 "Sa iy No. 18120 No, 48124 Thickness Gauge, for paper testing, automatically reading from 0 to 2 mm in ;}y mm by pointer and in ;yyo IMM by vernier. Mu tysBreesnccr meses ca aciste akelone 19.80 Duty Paid... cscs cteeeeeeeeeee 24.00 Note—The above Gauges are supplied with dial reading in inches and fractions thereof on special order. Paper Tester, Portable, Schopper, quick acting type, for strips 50 x 10 mm; with stretch scale reading in percentages. By means of a table the reading of the tensile strength scale is con- verted into kilo values up to 4 kilos, which is sufficient range for papers of ordinary strength. Price includes special strip cutter and a portable carrying case. Determinations can be made within one minute. Duty Breese seen so ceniosec nen 47.85 Duty Paids. 2: osc. eee eee 58.00 Note—The above machine is furnished for light papers with a capacity of 1.5 kilos and for heavy paper with a capacity of 15 kilos at the same price. Folding Test Machine, Schopper, for determination of the resistance of paper against repeated foldings. Suited for paper of all kinds, Le., printing, writing, wrapping papers, etc. As fur- nished by us to various departments of the U. S. Government. For papers weighing up to 150 grams per square meter. DutyiPreess otc ocics toe eres 165.00 Duty. Paid: sacs scene cicmaneereeee 200.00 Yarn Tester, Schopper, for testing the tensile strength and stretch of yarns, both plain and twisted, and threads of all kinds. With attachment for carrying cops, bobbins and spools and for testing in lengths of 200 mm. The stretching scale reads in both millimeters and percentage. With tensile strength scale from 0 GO WKUOS Aeeicestcteteersdmtoer ste 5 10 20 30 50 100 Dutyshree yan ceciiaerya eee eee 110.55 115.50 120.45 125.40 148.50 181.50 Duty Raid sr ncccecesta eae 134.00 140.00 146.00 152.00 180.00 220.00 Note—Any of the above machines can be supplied with an additional tensile strength scale of any specified range at $6.60 duty free and $8.00 duty paid. 526 No. 48136 No. 48140 48128. Rubber Testing Machine, Schopper—Dalen—Martens, for testing the elasticity and tensile strength of rubber. The test specimen is of ring shape and is rotated during the experiment, which makes possible the establishment of a numerical expression of the test. The machine is operated by water pressure and requires about 40 lbs. pressure. A recording device for automatically making a diagram of the relation of the load to elongation is provided at extra charge. Strength is indicated in both millimeters and percentage. See ‘“‘The Influence of the Shape of the Test Body upon the Results of the Strength Test,’’? Communications of the Royal Material Testing Institute of Grosslichterfelde, Vol. 4, 1909. With two scales, 0 to 50 kilos in 100 gram divisions and 0 to 100 kilos in 200 gram divisions. Duty Frees. eee eens ss 539.55 Duty Paid sess eles 654.00 48132. | Rubber Testing Machine, as above, but with automatic recording device. Dirity, Pr Ge xq chiascnsiesan e scins .. 664.95 Duty Paid...... Bana DADS OOOOC 806.00 48136. Test Ring Cutter, for making test specimens for above machine, with three knives. Duty Pree.) - 2 cco. de oes Aas.. 125240 HALA keccnabe Sout ansopooNsCoS 152.00 927 AS Re ly ee Oe ke Elie Da She OF Ma Ags GCG" VO" IM abe ae Nie 48140. Paper Strip Cutter, for cutting strips for testing of the standard width of 15 mm and for lengths up to 31 em. Duty Free... te LULA Duty Paid uate ... 14.00 Nos. 48144-60 No. 48168 OVEN, CONDITIONING, SCHOPPER, for the determination of moisture in silk, wool, cotton, wood pulp, cellu- lose, rags, ete. The balances may be used separately from the oven or in position on top of the oven, permitting the weighing to be made while the drying process continues, thus avoiding the absorption of moisture due to the removal of the specimen as necessary in older forms. These new models are very quick in operation because of the large amount of warm air supplied. The ovens are provided with chimney to carry off the products of combustion and do not unduly heat up the room in which they are operated. Size I takes about 200 grams of loose material such as unspun cotton or wool and about 500 grams of yarn, or about 1 kilo of cellulose or wet wood pulp. Size II has a capacity for about twice the amounts given for Size I. Gas, steam or electric heating is recommended in all cases where they are possible although the benzene and gasoline oil heaters may be satisfactorily operated where the other sources of heat are unavailable. 48144. Conditioning Oven, as above, for gas heating Size I. Size II Duty Free..... . Se Seo pscnaseune anes : : . 1382.00 214.50 IDS EET i Ce Gath ELS co eee en RR Fee hagas 160.00 260.00 48148. Extra for Automatic Temperature Regulator Duty Free ea OE A Ce Soon nae SOLO 29.70 Duty Paid..... at Pe ee ih OOtEE eerie. resrkll) 36.00 48152. Extra for Gas Pressure Manometer Duty Free cae : : ose ; 4.95 4.95 Duty Paid... apace : 6.00 6.00 48156. Conditioning Oven, as above, for benzene heating Duty Free so ae 8. AS. . 1388.60 224.40 Duty Paid... AAA .. 168.00 272.00 48160. Conditioning Oven, as above, for petroleum heating Duty Free...... we ee tek oN Eh Joanne ele) Duty Paid. . : roe ; eG .. 172.00 48164. Conditioning Oven, as above, for steam heating Duty Free. : Be TR PR ORG Aor ein ob ke Dum era dae 158.40 247.50 Duty aides peer ‘ b PSs ears aeRE peso be nl eens Cie See 192.00 300.00 48168. Conditioning Oven, as above, for electric heating Duty Free..... ec ee ... 191-40)" 267230 Duty Paid... SOR eee rere Sia ae nee oer ht aoe .. 232.00 324.00 528 a ARG rd OLR Hi. ie Ome MaaAw aS Gi Oe UMS RS © AS oN: RY No. 48172 No. 48180 48172. Conditioning Oven, Emerson, for the determination of the moisture content in textile materials, con- sisting of an electrically heated oven automatically maintained at the proper temperature by a thermostat. Arrangement is made within the oven for supporting four removable wire baskets or containers into which is placed the material to be conditioned. Balances are provided for weighing the material before and after conditioning, the latter weighing being made in the oven. A motor driven fan produces an artificial circulation of heated air through the oven and removes the moist atmosphere, thereby greatly reducing the time for testing. The apparatus is mounted on a wooden base and occupies a floor space of 23 x 4 ft., with a total height of about 6 ft. The heating device operates on either alternating or direct current but voltage must be stated in Gr6 ima a ny HA aos pole Case apende Oat Ube Somme amcor amaobe on oA Us Oona eae cocnc onecocenedn 350.00 48176. Balance, Torsion, for determining the exact weight in ounces or grams of a running yard or meter of cloth of any width without calculation or the use of weights. A two inch square sample is cut by means of a special die and the scale brought to balance by means of a slide weight. The beam is so graduated that either } oz. or 5 grams can be read..................--+.----- 35.00 SpecialaiienGorcutpenin chysqU Ares sets sire ose erste ase eee aaa hte ot teeta te eee 3.50 Mallet) lbsiniwereht, foruse withiabove Glen... seeeeesese ances eels LEY NAS se Seen ee eon. Sop on cca e 2.25 2.25 2.25 2.25 Thermometer, Soil, mounted in wooden frame with handle and brass pointed ferrule............ 1.50 - in strong metallic case and with scale reading from 0 to 60° C. in j;ths and with bore of various lengths depending upon the depth at which temperature is to be read. mengthrofbore below handle qmem(: sess. asc seis = aaa ey ee seer ssteaetane 50 100 eS | 2” Oe Re eran een _. 12.50 15.00 Thermometer, Sugar Factory, with enclosed paper scale 0 to 50°F. in 1° divisions, diameter § HHOL ak aro neice MEE SG DOSE RIB or Ge nec enrn oe cea da necemaor =r DBS ran ONOR eT Gere enee : Thermometer, Veterinary Clinical, with magnifying tube, as used in laboratory practice in taking animal temperatures; in 5 inch hard rubber case; range from 92° to 110° F. in yoths........ 1.25 Thermometer, as above, in nickel case with chain and pin similar to 48380.............-....... 1.50 Thermometers, Titre Test, for soap and fat laboratories, engraved on stem with magnifying glass and bulbs of Jena Normal glass; graduated in 75° divisions. (Ranges. sxoseetesea ee 0-20° C. 10-30° GC. 15-25°C. 20-30° C. 20-40° C. 30-50° C. 40-60° C. Rach ton eee ae 5.00 5.00 5.00 5.00 5.00 500 nb LOOme | th 50 > vs] 3) = Nos. 48412, 48416 and 48420 No. 48424 No. 48428 No. 48432 48412. 48416. 48420. 48424. 48428, 48432. 48436. 48440. Thermo-regulator, Reichert. This regulator is carefully made and is the most widely used among the several forms constructed of mercury and glass; adjusted for high temperatures ............. 2.00 Thermo-regulator, Reichert, same construction as No. 48412 but adjusted for low temperatures... 2.00 Thermo-regulator, Reichert, same construction as No. 48416 but made shorter for use in paraffine baths. foc sess aycs oes SAS ec aio are saicre nla eae Selo ele See eS Ree ee 2.00 Thermo-regulator, Reichert, improved form, with stopcock to prevent total extinguishing of flame, 4.00 Thermo-regulator, New Mercury Form, with reservoir tube with thermometer scale and two-way stop- cock for adjustment. In setting the regulator the stopcock is set at position ‘“‘A’’ and the bulb warmed until the mercury reaches the position ‘‘B” at the tip of the glass outlet tube. The stopcock is then turned to position ‘‘B” and the mercury column allowed to rise until it reaches the temperature at which the regulator is to operate, when the cock is turned again to position “A” and the thermo-regulator is in’adyustment |... 52-2. . S.eeee- =. oe- eee eee 7.50 Thermo-regulator, as above, with electric contact, otherwise operating on the same principle and by the ‘same method! as above? ./o2 0 o..c0-es sles oe denen sede one eee ee eee 10. Thermo-regulator, Roux Bimetallic. The great advantage of this regulator consists in the entire absence of mercury and glass, the control depending upon the unequal expansion of the different metals composing the metallic couple. It has come into very wide use of recent years and is in many ways the most satisfactory form of thermo-regulator now offered. All of our bimetallic regulators are furnished with an additional brass jacket as shown in illustration. It is recom- mended that this jacket be inserted in the tubulature of the incubator and the same filled with glycerine, into which the regulator proper is immersed. This prevents the corroding of the bimetallic couple (which occurs in many localities because of the action of the water) and at the same time makes the regulator last longer. eneth, -inches®. i: se so en concen cee ae eee ee 10 12 No. 48440 Thermo-regulator, Reichert-Novy. This regulator is based upon the principle of the Reichert Thermo- regulator with modifications. It works equally well for high or low temperatures and is specially recommended for accurate control when used with a gas pressure regulator..............-- 5. or (iw) a Ava oa Ee Us OR H. ie. Hee Oe Me VAL TS Ce OM ea Aa rN < No. 48444 Ne. 48460 No. 48464 No. 48468 48444. Thermo-regulator, Greenman. Constructed entirely of steel and recommended as being the most ac- curate form of mercury regulator. Controls temperature within 4 ° regardless of gas pressure or room temperature. For use with this regulator burner No. 22936 is recommended. With brass jacket for glycerine to be inserted in tubulature of incubator. See Anatomical Record, Sept., PODS ENV ALOU UEINELCUL Yara pas srcincraec re eee eee ee ee on Ae 12.50 48448. Thermo-regulator, same as No. 48444 but filled with mercury...............0 20.0 ccc ceececseeee 14.50 48452. Gas Pressure Regulator, for delivering gas to apparatus at a constant pressure, regardless of the varia- tions of pressure in the house “supply. Particularly recommended for use with the Reichert- Novy Gas Regulator No. 48440, with which it is possible to maintain very constant tempera- LUNES ee Vlad er olecappersuanoughOU term meet steer rie et ttt ee eee eae LOO. 48456. Thermo-regulator, Electric, with Condenser. Will automatically maintain a constant temperature through a wide range, i. e., between 30° and 80°C. The diaphragm consists of rubber and metal clamped securely between steel rings. As the expansion of rubber when exposed to heat is greater than that of metal, the diaphragm will move away from the platinum point at the slightest increase in temperature. This breaks the circuit and allows the incubator to cool until the diaphragm again touches the point. By varying the pressure between the adjusting screw and the diaphragm different degrees of heat in the incubator are thus obtained. Con- tact points are of platinum iridium and the condenser protects these contacts from being destroyed providing the electric current passing through same does not exceed 4) amperes, ines the current trom usual Incandescent) sockets). .c.-.cbiae cee cess se mieeins carnieele 10.00 48460. Thermo- regulator, Electric, with Incandescent Lamp Heater, for he ating ineub ators, paraffine baths, etc., not specially built for electric heating and control; consisting of thermo-regulator similar to above, with an incandescent lamp mounted on same board. with cord and plug for attachment to any lamp socket. It is usually sufficient to place same on the bottom of the incubator or oven and run the connecting cord through the horizontal hole found at the side of most incubators. The space required by the entire equipment is 8x8 x43 inches..... 12.50 48464. Thermo-regulator, Electric, expanding capsule type, ‘‘Break’’ form, for use alone with any electrical heating medium which does not require more than 3 or 4 amperes. May be used on either 110 or 220 volt circuits either alternating or direct and for temperatures from 15° to 160° C. The range of each capsule is about 20° in the lower temperatures and nearly 100° in high tem- peratures. The capsule ‘*C’’ must be within the heated chamber and the post ‘‘P’’ may be made longer or shorter depending upon the length of the tubulation into which post must be inserted, i.e., tubulation from the outside of the utensil through the air jacket, water jacket, etc., to the inner chamber. The screws ‘‘S’? need not be used as in many utensils it is sufficient to allow the metallic cap ‘‘M”’ to rest on the top of the tubulation or of the incubator. Very satis- factory on incubators, ovens, water and oil baths, whether disc heaters, resistance coils or lamps are used for the heating medium. In ordering z please state whether current is alternating or direct, range of temperature desired, size of chamber, and thickness and material of the walls of same for length of post ‘‘P;’’ and whether thermo-regulator is to be placed in a vertical or horizontal position, vertical being preferable. With instructions for wiring, and connections......... 7.00 48465. Extra Expansion Capsules. . Fen eta te Nin Jet Saat coRPO ROS OOS aC Soe oe 1.00 48468. Thermo-regulator, Electric, expanding capsule type, similar in operation to No. 48464 but known as the ‘‘Make’’ form and for currents up to 8 or 10 amperes. Must be used with circuit breaker as a relay which indirectly interrupts the heating current. This is furnished with a circuit breaker consisting of a solenoid wound with a heavy wire and with large platinum iridium CONUACESN sere sina eyereterston- ORE See rar ED Habe abe So Oe OOS e Dre Ce bon TOO tao moe we ALD) No. 48476 No. 48480 48496. 48500. 48504. 48516. S = —_ No. 48484 No. 48492 No. 48496 No. 48500 No. 48504 Tiles, Earthenware, glazed on one side only; very convenient for supplying either a black or white background. ; GOLOr 2 aie nes 2% sess sis. s.sie Slenahe side or clave. ave eer tre ese ee ore oer rae ore _ Black White BaD ccs 5 2c aane stein eerste cro eens © 5/41 heseunle d Serale Bgl cloloe exe oe aoe -30 25 Tray, Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire proof; convenient for dissecting, Instruments, size 12x 3} x 13 inches. ....0. 0.2.2. -4-----2 + eee eee Trays, Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire eae deep form. Sizes INCHES = sey-an eteicsiee tats os. Mem ale enciaerte aa es eaten woe ae eoe 10} x 6; x 2 15 x 9 x 2% LEH | patented Seach eas SRS EIC oe EIA a nP Oa see Sas a 5 1.00 2.00 Trays, Aseptic Enamel Ware, of seamless steel, white enamelled, both acid and fire proof; shallow form; very convenient in the laboratory for dissections on small animals. Sizesinches eee. corer ee Oe ee ee ee 12x9 16x12 72005 LDPC Anes eR eee te een C or ik ene ne ENE Or ims ate Le -80 1.30 2.35 Tray, Dissecting, of heavily tinned metal, japanned, with metal loops on the corners to which the limbs of animals are tied during dissection. Melted wax may be conveniently run into these pans in the laboratory if wax bottom i is desired. Size 11 x 9 x 1} inches Trays, Glass, with vertical sides and polish:d edges. en pen mM severe eisai yaa eae ee ten = 6 tae ees Oe eee 100 115 120 SWE Ga SM ooh aye eae EES oo TNO a) I ein orc oe I ee 40 50 60 ei hb MMe esioyais cine seecencinisie Oat cithe,ys siacie ee eae an COR Ree OE ee 40 50 35 Mache wy Percsr crs crea tecz sil See s oe EO ee ee -50 -60 70 Trays, Glass, with slanting sides and polished edges; much superior to ordinary photographic trays. GOT FEDS TIE sem elses Hays BEERS SiO ore ni Bz ea ele te ee 160 210 260 Wid Gheeram aeons SO aL Gk Meee ata aisle Vict alin Cae Beene 130 160 210 Bid eChys cad ieee ants Sed wees Site co ee Bertie eo a ee ee ee -90 1.25 2.00 Trays, Glass, with vertical sides and polished edges. GEN PEN SMM orev se staves oe Se en eee oe ee 200 265 350 350 NWT EA Ne Toa hitlae eh ee ere Geert ene ees a 100 165 170 220 Height smi yc se cote hme anne bene eee 2) IN eee 45 50 50 60 LOE |e hai en actos ASE eI SEO eee ray acleie 2 wre 00 2.00 2.50 3.00 Trays, Sanitats Porcelain, deep form, with spout. hen g Ube mM eeresisisre hosel racks rere cie ceioe she oe ee eee 155 255 290 Widthamnmit ie eee Setters noe ta 125 195 240 75 3.00 Tongs, Crucible, of polished brass, single bent. 1 DSS cf. 7) gp 10101 Greer eee AER ini bet tals ee bel od eRe esi owe ee sccoone 200 250 LETH (ee See ee oe ene eee it A RAEN ene RN a. On ea meme ode sce So+s 50 -80 Tongs, Crucible, of nickel plated brass, single bent. 1 es 3 4 11 ee ee eT eer Se TURE ee eet os Se ee (elt ia pie wases cess 200 280 Macher scpcets tisha s Sake ete oe eae oe a A ee BR a ee 60 -90 Tongs, Crucible, of steel with black oxidized finish, double bent, 200 mm long: reeommended for stu- dents’ Uses sessed vs LE Coach ole beeen SER eens See Aino ee Ses ee -25 48518. 48520, 48524. 48568. 48572. 48576. No. 48560 No. 48564 Tongs, Crucible, of polished brass, double bent. ILC AI, Tihs ob aemnneo dnd odocdbodau bdo sCoUnEDOnOUscoSéecuoasoans 200 250 300 LOLA | ee ne, See Seon AC trciol tcc oe cece aCe Ose aoa eee aerate 55 -90 1.20 Tongs, Crucible, of nickel plated brass, double bent. MUSeema oats a TNT ee ead teste teats crete eecknie evs te tata oie salar, 012 evesis (sve< /evatatercusyetatel!=seveps exe 200 250 300 LOE) No Reais Baa Stemi Cons rcig OC. o CoG CO COIR CIE er eee CT i ecaenenc ae -65 1.00 1.30 Tongs, Crucible, of forged steel, nickel plated, single bent. 1EGHYa a JVs ge adeao bos utc op Ona 6 antiap aeddasocTeecs 7506 atta mane 200 250 300 LORY] (igi eA eS e See Ea enone ciao CT ATS D ACI COCO Ieee cman certo -50 -70 1.00 Tongs, Crucible, of forged steel, nickel plated, double bent. IST TNT es spseseucse Sie Se Ceiaee #1 arora a ere NS = selesoia sa! Cools istesa, SN obaletns iota ays fase 1 DENA Fil am oh ere OEE ie OnE OP Ca! os oe Ge aoe Cee aces knee Tongs, Crucible, of pure wrought nickel, double bent; 200 mm long........ oe “ solid German silver, double bent, 230 mm LOT HRP Ey tere “ “ “ with platinum tips or shoes. Our crucible tongs of steel No. 48528, of pure nickel No. 48532 and of solid German silver No. 48536 are furnished with platinum shoes or tips at the lowest market price of platinum. Tongs, Crucible, of pure wrought nickel with nickel chromium tips, double bent, 200 mm long. A new substitute for platinum tipped tongs and highly reeommended.....................-.- 2.50 Tongs, Crucible, of malleable iron, single bent, heavy, “for assay crucibles. Hen oth Win Chesy ics ea joer, cpandasereisis sie eileen eke ae wisi reuse Sass GEREN et cprkcts « adh 12 17 LOIN (Se Renita d olor ck Coc orang aa an Gn Be Hin Crate eRe eal eh eet 40 50 Tongs, Crucible, of wrought iron, double bent, 30 inches long; heavy for assay cruc icibles.....-.- 1.75 Tongs, Cupel, of steel with curved ends and uide pin; 22 inches longer Sens Sem WE RE ee: 1.00 « «with bent ends and guide pin. Length, inches bet AR 20 25880 | DINO Sok Sas tere eaeibes Geta bores lea aetna re iaicl chor cee a Senior erie en ai Gcetete 1.00 1.00 1.00 Tongs, Scorifier, of spring steel. Length, inches.................. Oa ice 20 30 36 PDR CD earer ans csc a varere as sverecehe oie vevene users le oer foveve asckenatetebs uate ger se seySucusstats, mege aaa PES oe 1.00 1.00 1.00 y Y => My et May F My No. 48568 Triangles, of twisted iron wire. Length of side, inches.................--.- 14 Zh 3 LUG Nis Go nb peahagcnt Sacer DonD OMG women ios Loc outa re cnmE ton ea ce mace 05 05 05 LST GOYA Sateraers OOS COR GHC TERE ree trr hci eR ate Rete 50 -50 50 Triangles, of iron wire covered with pipe-stem. ene Uhwotesid evi chests seep voci c ese eR eae Tt eciarels 14 2 23 LOEG Ne cpp oat ps OO ROaEB non 5 Honoe Bono DTian DoS oa amore eects ees on aeter .05 05 05 1207 COGS ER eonnise pone 6 ae Gh ae ne EAE Sh onGe hen Aas Beate eee 50 50 50 Triangles, of iron wire covered with pipe-stem, flanged in center. en pUbvolside winches mcreee ech eee ean ee eet ee REE Sra fo a 14 2 25 DOETY We Sian Broan na Beco aoa ae ere ape a GSO e OCH AEE ROO ca amen Dent aera 080 PA C08E © 08 RR OLAGOZEN: Secrets eyes Oe eels coe 75 75 75 539 48588. 48592. 48596. 48600. 48604. Triangles, Solid Nickel. Length of side, inches......... Been esta woes 2 25 3 ware placed upon it. Nene thiofsidesinches*=s as. ae eeee en cee SONA e 1; LOE (Oats cada oe eee corse Sanna Toor Bedaaonoibocs secoodae 20 Triangles, Opaque Fused Silica. Length of each side, inches........... i Mach Weoley eee Eee 75 A Triangles, Nichrome Wire covered with pure fused opaque silica. ihengthvofieach sides inchessec,.sseeer aero ene ence 3 Trichinoscope, for the Trichina Test by Micro Projection. The com- pressorium sample is covered square by square in the field of the microscope and thrown on the screen. The observer controls both the focusing of the microscope and the movement of the specimen while observing the screen from position at table. The operation is much less laborious and more satisfactory than with the ordinary microscope. As furnished by us to the U. S. Department of Agri- culture, Bureau of Animal Industry. The outfit includes iron sup- ports, projecting system with two objectives, compressorium, nosepiece for revolving the objective, cooling chamber and hand regu- lating are lamp for 5 amperes, direct current rheostat for same for 110 volts, and 50 pairs of carbons. DutyKrees---e ee 155.00 Dutyjbaids.--- 4. ... 208.00 Trichinoscope, as above, but with automatic arc lamp. Duty Free....... ... 190.00 Duty Paides-- a. _. 253.00 Resistance, for 220 volt circuit. Dutyzkrees ss 5.40 DutysRaid=.---eee ee 7.20 No. 48596 20 Sees 30 2 } 3 25 -30 +35 3 } 4 1.00 1.15 1.25 2 23 3 25 35 40 48608. 48612. 48616. 48620. 48624. 48628. 48632. 48636. 48640. 48644. 48648. 48652. 48656. 48660. No. 48652 we } YY J ar 77 | | e| = 2) 8 No. 48640 No. 48644 No. 48648 No. 48636 No. 48656 No. 48660 Tripod, of cast iron, 6 inches high with ring 3 inches inside diameter; suitable for alcohol lamps or small [SLE th oednd CHa OU OSG OUD edd s CRRDO na bSoe ttn Senate tee sade ISCae oC SarEomocmaea> coendarne -20 Tripods, of cast iron, smoothly finished and well japanned; 9 inches high. Outside diameter, inches.............. As 5 6 8 10 12 LEYS CS esp eo OCnI Oo Ret DOO corer Cece eaae 25 25 30 50 -65 80 Tripods, of cast iron, smoothly finished and well japanned, with concentric rings; height 9 inches. Outside diameter, of rings inches................. 5 6 8 10 12 Number Of Tings: cee. soeron ease aiesicrisinieeisiosescic 2 es 5 _ 8 | YS a ei es ree ARS oO CISCEC Ekcah ic OSCR RE RCS Mace NIE 35 -40 75 1.00 1.40 Tripod, of iron, with adjustable support for burner, 9 inches high with ring 33 inches inside diameter .75 Tripod, of iron, with triangular top; 9 inches high. engthvotasides cme sccm emcee serecite. aa cclstere eaten erate 10 12 15 20 JeST AN Gina cbc Bre AO RSo eS Sa BORte ae ORO RoenOaroos oF ISP 20s 25 LI Os oe SoS p pb Reon a sono act AEnOS Gene Nan HRe Sane nononneas 50 .60 -70 80 Tripod, Genth, exactly as used in the John Harrison Chemical Laboratory, University of Pennsylvania; of cast iron, with slip-in legs and removable plate; diameter 103 inches, diameter of removable plate seanchestheipht) san Chese ic: ca soe aoe oe ee eee Stare Sn wieS Oe bieie aie cierwss alalerelets 1.00 Tripods, of sheet iron, with metal chimney for the protection of the flame; very convenient for flat bottom flasks or wire gauze. LES alist ag Sho enos SoU ods BED etre Sma eag Bot acn den AER e Ha ae 240 265 290 Herehbiol chimney. mmnmsren sce.) ecco sexe a ce ord semiele els 100 115 130 Imsidetdiameteriorchimney mm jas. rs eenretioee cisco eee ene 100 125 130 LOG ecole AO DoS OREO OOO DUO TEENA BOOS ENG Gein ae oaeete 50 65 -90 Tripod, of sheet iron, with metal chimney for protection of the flame, with supports curved downward to take round bottom flasks, evaporating dishes, etc.; height 200 mm by 60 mm diameter of (LIT Ren Goa BOB aa BOn cu daE.d BODONE HOGeS BHSd dd aa aon DR nea aa npne aeaeera cS coneaacUo oc -60 Tubes, Brass, T-shape. Bore, inches................. 4 as + ts 3 DEY T= SISter SO POY Ten eae ne 30) a ab 40 45 50 Tubes, Brass, Y-shape. Bore, inches................. 4 Zs 3 te 3 ach os sree et ie 2) 2 | Re Be 300% 1p Sh eee 240 ee doe 50 Tubes, Glass, T-shape. Bore, mm 3 5 6 9 12 18 25 DEA he ae ton oan pene [060 LOS .09 105 H14 .30 AB Tube, Glass, T-shape, with two Geissler stopcocks, bore 5mm...............000-eeeeeeeeeeeeees 2.25 Tubes, Glass, U-shape. Bore, mm 33 5 6 9 12 18 25 Bachsa heen isc eee .06 08 09° -10 14 _.30 45 Tubes, Glass, Y-shape. Bore, mm 3 5 6 9 12 18 25 ach'enus sp aeins torent 06:7) @0Si eam. 209 Tales ae! .30 ” 45 541 Pee ly (HUE aR Ho by LO} eM Aga GO" 4M EF Ay aN No. 48664 No. 48668 No. 48676 No. 21904 No. 48680 48664. Tube, Vivien, for sugar analysis, as described in Friihling & Schultz..... Se Gob Das IGESE Bauoceosen > -60 48668. Tube, Hortvet, for use in the centrifuge in determining lead precipitates in the analysis of sugar and syrup. See Bulletin No. 107 of the U. S. Department of Agriculture, Bureau of Chemistry.... .75 48672. Tubing, Flexible Metallic, recommended as being safer and much more permanent than rubber tubing, inch diameter: Per foots. 2.20... << oo. cee sole mie cliente > 2 elo os ele einen eee ees -20 48676. Tubing, Flexible Metallic, in lengths for Bunsen burner connections; with rubber connectors at both ends; } inch diameter. Weneth lee teccec.s tees ect eielelne ete Re SenoudpoosHapeaasacosoce Zina ; ees Bachsereesee : = ane feo eee tte 25 -30 50 48678. Extra Rubber Connectors, each.......... cgi alana 3154101 SERS 5 ROCs 1 eee -05 21904. Tumbler, of glass, with spout, capacity 7 02...........- 5. essere erence rns e renter ees -10 48680. s as above, without spout.......... ; : Eee PEs ooo ccs - 05 No. 48684 No. 48704 48684. | Turbidimeter, Jackson, for determining sulphates in water analysis, ete., complete with 22cm tube. 12.00 48688. Extra.22 cm ‘tube, for aboves.. 0c. sees ge cease os 0m oes Sa e-em ol alene ee eee ee 48692. sce CHR « Oe oe cearaceua a dicta loteel aisle bigeye eaten Oaigeks shes 6 le SE ee 5.00 48696. Brass, extension for use with long tubes: ..... . 2 ect oe dele cee pete yer et oe eee 3.00 48700. Gandless per, dozen :iace.sac3 2c cc safes 4 -coodso0CCOCE 1. No. 48928 No. 48940 No. 48948 No. 48952 No. 48960 No. 48964 48928. 48932. 48936. 48940. 48944. 48948. 48952. 48956. 48960. 48964. 48968. ~ Wose a Washing Bottle, consisting of a No. 28104 Flask, extra heavy, rubber * stopper and glass tubes. Wapaeityatceltn. ce scincsmener ecpaseecn iene ceyeiieiielere clasts 250 500 __ 1000 2000 | DEY ee oe ie ee ene Pena ho bind marin eaNe oo monn aotia? -40 -50 75 1.00 Fittings only for Washing Bottle No. 48928, i. e. , rubber stopper and glass tubes without flask....... -10 Washing Bottle, New Jena Glass, with rubber ‘corks and Jena glass tubes. @apacity; ce... ... «1: Braeden we jean 250 500 100015002000 1 DENG Vea ey oan Beir 2 Soe SE 2 a 2c 3 68 90 1.05 1.20 1.30 Washing Bottle, Faraday, consisting of a No. 28104 flask, extra heavy, with rubber stopper, glass tubes with rubber joint in outlet tube to give flexibility. Capacityarccianes scm eceee Heike ae seen en a5 AA eS ae 250 500 1000 2000 DE (tea ee en cinioprrnch ona Oaobisa ae odoinn. aucroamamnees 40 -50 15 1.00 Fittings only for Washing Bottle No. 48940, i.e., rubber stopper and glass tubes without flask. . -10 Washing Bottle, same as “No. 48940 but with rattan covered neck. For convenient holding while hot. Capacity nccerrta- see =. Sidvalereos Pe aig aqaceter eras aveuchaledencte anode cenelzca sterste atarsvc ssh pehctote terpenes 500 — 1000 LOL} (Roaaes Horne eS enaercmc mcs Gon coon eoacbors odebhodamnebacmachGotadnonconas 70 -90 Washing bottle, arranged for continuous flow, 500\ce capacity ..... aoeencteine- «oi eee ee eee .70 Fittings only for Washing Bottles, consisting of rubber jpteppe, and glass tubes arranged for con- binuOUsetl OWA iseih ie cee neteee oo anoeee Sarees MAME Scicotionoe oil) Washing Bottle, for volatile liquids, with ground in elas ass stopper. WADACILYCOs ss «kts accclot eit Meee eae Te a eee ‘125 250 500 —_—«1000 | DET Gis ric aS aR ERS Se rege RNS, Sr Baad A Sha -80 1.00 | 1.25 1.50 Washing Bottles, for volatile liquids, with ground in class stopper and two glass stopcocks. GapaeliyoncOs-ctes tries eer toro Panes Roe 125 250 500 1000 LENDS Goan ae cae snr eos tiemad Acorn oo ne td daccee ce core 2.25 2.50 2.75 3.00 Washing Apparatus, Bain, for microscopic material; consisting of a glass cylinder with base and a discharge tubulation at the top; with a plain glass tube fitting into same with a one-hole cork f- 272mm stopper at bottom and a set of 6 sieve thimbles, one end of which |F25s~--4| is bound with fine silk bolting cloth. The washing liquid is allowed 1 to drop into the inside cylinder and, after passing through the sieves, rises in the outside cylinder and flows off through the outlet ‘‘C,” with 6 sieve thimbless « ..:.. 2 e/jcra =) -soveii delete lee eee renee eee 2.50 48972. Extra Sieve Thimbies, each.......... .25 48976. Waste Pail, Aseptic Enamel Ware; of seam- less steel, white enamelled, both acid and fire proof; very convenient in the labora- tory; with perforated tray which retains the solid matter such as filter paper, etc.; which may be lifted out before the bucket is emptied; 16 inches high, 12 inches diameter, 5 gallons capacity. 6.00 $0. No. 48968 No. 48976 546 48988. 48992. 48996. 49000. 49004. 49008. 49012. 49016. 49020. 49024. 49028. 49032. 49036. No. 49016 No. 49020 No. 49028 No. 49032 Bache - -05 Watch Glass, with concave center and a small facet on the bottom; 45 mm diameter. 0 Per dozen.. .50 Watch Glasses, of well annealed glass, with edges smcothty ground. IDG Ta CMa Tin Oe es 5 GO Eee aetna. 25 30 35 40 50 65 75 85 90 LL 2 at ARR Eiie SED SOE ean ERs Jorcrinn -03 -03 -03 -03 -03 -05 -05 07 07 Lets G (Vea iegaes Bees ain Sere Oy es ay PS ee EE SE DIAMELEDA MM. 2 Asc ss CO crate Se ce 100 115 125, 140 150) «165 | 175 200 LOG) inc Sen ao OSE He DERE RnES SD ESEB eo SaSaneae (ea ak Se ea eS 6 BS POEIEOZ CMe ee alas reco eee | See 85 1.30 1.80 2.40 2.50 3.00 3.00 3.80 Watch Glasses, New Jena Glass. Diameter, mm......... 45 50. —s«60 LO 80 90 100 110 Bacheeton sass. ee -08 -09 -10 13 15 20 25 35 Diameter,mm......... 120 130 150 170 190 210 220 235 LETH ean ooaeeeehodeee 43 50 -63 80 85 95 1.05 1.15 Watch Glasses, in Pairs, with edges accurately ground together, for use with clamps No. 24670. These are not to be confused with counterpoised watch glasses No. 49000. PTAMO|LED INI S epane eer eeyeemiitnete Soe See ose Sake wisorin | Sale niga mises soe 50 _ 65 TESTA Tats See Re ebco oc onus aa Sona Se OSE aC PR SOn Ae DAs as Anne ah Coc rOeoen Agere 15 25 Watch Glasses, in Pairs, with clamps No. 24670. rameter esis ccctee ieee ele eters : - 14.00 Water Bath, same as No. 49144 but fitted with steam coil............... 22.2... 2-0 e eee eee eee 18.00 Water Bath, Victor Meyer, with improved support and including 2 porcelain plates as shown in illus- tration, glass funnel and water level regulator; 8 inches in diameter...................... 10.00 Glass Funnel; only, for use with above-.....-. 2. cn. oc = os cele eile eee eee 1.20 No. 49160 Water Bath, Hearson Electric, with constant water level. By means of an electric heater water is kept constantly at a boiling point and the upper compartment filled with steam. Boiling water can be drawn off at any time for use for other purposes. Sizesinchess steele ee ae Tee Ne cho FEIT tg oneee 24x12x5 30x12x 44 Numbenornoles-seeceraeo oes eee eee Sees a as See se ea aH 10 24 Diameteriormholes sinches eee ee see eee ee a nae ernie oe eee ies 33 ie Duty Bree ee eae ore a ee a eine oe eieTn ss OSLER Sele mer eens 53.25 64.65 NOT gd ot UU bet Relea Sean Ci GeR en ori ee CREAN rae get ee AeA Ge aA merC 80.00 97.00 49164. No. 49164 No. 49164 Water Bath, Electric, of heavy polished copper, tin lined, with heating coil immersed in the water chamber. This coil is arranged for three heats, controllable by means of a one-plug switch. It will hold water at the boiling point when running on the high heat. The smaller size bath takes 400 Watts per hour on the high heat. At the rate of 8¢ per KW, the operating expense on the high heat is 3.2¢ per hour, on the medium heat 13¢ and on the low heat 3¢ per hour. A remov- able cover is provided containing two sets of rings on the small bath and four sets on the large bath, also a removable copper tray resting inside of the bath for use with beakers, evaporating dishes, etc., immersed in the water as shown in illustration. The bath provides a very conven- ient method for the distillation of volatile liquids with absolute safety because of the immersion of the heating element, also fat extractions, etc., as shown in illustration. No special wiring is necessary, the connection being made with ordinary lighting circuit either alternating or direct current but voltage must be specified in ordering. Size, inches No. 49184 No. 49168 = |= Water Bath, Matthews, as used in the Philadelphia Textile School, with four porcelain beakers, 325 ce capacity, with spout. Complete with gas burner, protection plate and beaker collars.... 21.00 Water Bath, Matthews, as above, for use with either glycerine or calcium chloride as heating medium; of extra heavy copper with hard brazed seams; with four porcelain beakers.............. 26.00 Water Bath, for Dyers as widely used in the textile industry; with beakers or dye pots our No. 21832 with lid but without burner. Number of beakers............-....+:++-----5-- 3 mon gC he meee ea aie eet PS 5a cc ul os Pcs ates be I SP este OL ORE SO200 551 AYR ale Thee aR Hy. > Sh Hey On IMERFAgeS CG 40) (MERE. aAyeINige Counting Cell No. 49200 No. 49204 to 49240 No. 49244 49200. Water Bath, Reischauer, for volumetric maltose determinations, etc.; with tripod and tube holder. 8.00 Water Examination Apparatus, ania: for the Microscopic Examination of Water, as described in “The Microscopy of Drinking Water,’ by Geo. C. Whipple; consisting of the following:— 49204. Sedgewick- Rafter Funnel, graduated, with att achment and rubber stopper icing Saas eee Pee sce 2c) 49208. sf ungraduated “ Re eae ect d= = se Ua 49212. Berkshire Sand, per lb.. Bid Rothe SORTA Ra toc as alta Css IR ae ATS ee Se cpa LO) 49216. _Bolting cloth discs, per dozen ayer ne ee chats Bake SEIN ae g : x5 OS 49220. Support for funnel............. pee Pie Je Be Shots aoe ae es .. 1.30 49224. Counting (Celle sao eee SBP Rvs 531 Gales See OSGeo PSS coat OUN: 49228. Cover Slip.. Ue eenmae iat Merce ne ice Pe PS ona at Ror Be oo 33 ore ee -10 49232. Eyepiece Micrometeris ek oe ee eae CO ; é ax vss aon ees ae 3.50 49236. Pipettes 1 ce and 5 COS agente cea oer sie (eater avacablSrayave, ia) atattofana 6 ay2) «othe PRPS Sta enone -20 49240. Blask; oraduateds 25 CC: es: ecciac eres ce avera ape se aa siete Ree to tenera a akeinvs git & a ale lasana a etoe ond) er 30 49244. Water Heater, Fletcher ‘with attachme mt for instantane ously heating water. When connected with cold water faucet hot water is delivered in three seconds after gas is lighted. Gas supply of 2 inch clear bore is recommended. Complete with burner as illustrated..:.-......2+. 522 6.00 49248. Heating Attachment only, of No. 49244 without | DUEMED, «2:5. )<)c10/02 272109 sien Slee eee eee 4.00 49252. Water Heater, same as No. 49244 but with wheel valve, i for use with gasoline gas. .---...-- ss 7.00 | 49256. Water Heater, for instantaneously delivering water from q luke warm to boiling point when connected with cold water faucet. Gas supply should be # inch clear bore. Small size consumes 20 ft. of gas per hour and large size 40 ft. The small size will heat 1 pt. of water per minute from 50° F. or will boil 15 quarts per hour, the capacity of the larger size being about double that of the smaller. These heaters are supplied with a pilot light and are made entirely of brass and copper, polished and nickel plated. Sizes). altace waoostn «ocesehnee Small _ Large Bachisocicceiciecseiieoeeece eee 25.00 30.00 49260. Extra for burner adjusted for gasoline gas on either'size.\...---.8-seeee 1.00 Dah. (Uh sR ieee ite lecOn Mia “Ay S GQ @vymwh iP 2y IN 3¢ ALKAT.CO. No. 49280 No. 49288 No. 49292 No. 49304 No. 49312 No. 49316 No. 49264 No. 49268 No. 49320 No. 49324 49264. Water Sampling Apparatus, Esmarch, consisting of a glass bottle in a metal frame with parts so ar- ranged that when the apparatus is lowered to the desired depth the stopper is removed, where- upon the bottle fills, after which the stopper, is replaced... 3.0.2... ...-000....dses-+--e-e- 9.00 49268. Water Tester, Dionic, for the exact measurement of small quantities of known substances in water by measurement of the electric conductivity of the solution. Consisting of a special glass vessel with terminals for the water under test and a conductivity meter reading directly and without calculation the conductivity of any electrolytic solution in the tube, as used for measuring leak- age into surface condensers, testing of boiler feed water, hard material in sewage, determina- tion of sewage effluent, the purity of distilled water, ete.; for very weak solutions. DutyRrees yoeee eee 111.00 Duty: Raids x itis eta ges 148.00 49272. Water Tester, Dionic, for use with sea water and solutions of a similar nature. IDUtywEREera eee eee 114.00 Duty Paid racic ae 152.00 AD OmeWiax Sealine first aualitya imestickss) (erilbeen. acct ccc ctiee criss + Gaugeraccs. peer e cee 12 14 16 18-2022 24 27 30 Perispool iis: sce eins Mole eee 220977220) 7-20 220/ 25 25) 25a Wire, Copper, single silk coated. B.& S.gauge.. 12. 14 16 18-20 22-24 27 30 Beriouncesecseny 5 shia sioner ae 15 15 15 15 15 -20 20 25 -30 Wire, Iron, chemically pure for standardizing, containing 99.859 Fe. Per ounce................. 15 Perpound!.)..-- eee -90 Wire, Pure Nickel. B.& S. gauge........... 16 18 20 22 24 26 Or OUNCES. 2 cic aspen en sec ocr s pram niee eae -16 16 alii 18 19 20 Per pound se easiest ees 2.10 2.10 2.15 2.20 2.25 2.30 Wire, Nichrome. This alloy is practically non-corrosive with an extremely high melting point, i.e., 2800° F’., and with a specific resistance equal to that of mercury. Bs G'S. gaugenwiss-.:s:0-. 14 16) | 18) 220) oor toa 96 Sos Ome 36 Perjounee:sscentissssasctes 26. 28 30 .35 40 45 50 .55) |.60l) G7nimumeteal Per pound!isaecjac. sot an! 3.40] 3.60 4.00 4.40 4.85 5.40 6.00 6.80 7.70 9.50 16.50 Wire, Nichrome, ribbon form, in widths from #;nd to 1 inch and any thickness from B. & S. gauge No. 14 to 40. Prices on application. Wire Gauze, Brass, for general use. Meshtrcmnancmcricin icine 10 20 30 40 60 80 100 Per square foot............... 50 50 55 60 .70 1.00 “1.45 Wire Gauze, Copper, for combustion. Mesh........... 20 40 60 80 100 Bersquarciioote. near eccer nee ee Sacer 50 -60 .70 1.00 1.45 Wire Gauze, Iron. Mesh. 6 10 14 16 20 30 40 60 Per square foot..... .22 27 -28 32 35) 37 45 70 Wire Gauze, Brass, in squares of proper thickness and mesh for heating beakers, dishes, etce., over Hames ISIZesinchese serene aan eee ence PaaS ESOC Lo 6 on 4 5 6 RET; SAUALG wae are arin hee oe era bi nyshavave oisde: sheveisraceteneyavesus ansgerereisloheters wal [15 Wire Gauze; Nickel, 30'mesh: Ber square foot....5.-2. --. cm esn < Ane se ae eee 1.50 Wire Gauze, Nickel Chromium, of great durability because of the high heat resisting quality of this alloys SIZENIN CHES oe cesiane ters eee sess oe eee ere eee 5 Or SQUAaY@ hin 5.2 cise soc ete Be be cinerea a i soca A) -60 re) Wire Gauze, Iron, in squares, for supporting dishes, ete. Size,inches 4 5 6 8 PerssqUale eet ay cr Roya ee RN ese .05 .06 -08 Wes Per dozen squares................ satape Sire SRE OR 50 .60 80 2.00 Wire Gauze, with Asbestos Center, of tinned iron wire, insquares. Size,mm _ 100 120 150 Vote) Diopr LE) hore eRe ase ois Eee ar ae Cnr eRe EnCae te Men eas eI Solar 12 me 0 Wire Gauze, Asbestos Covered, Carliczek, of brass but with each wire covered with asbestos coating by a new process; very much more durable and economical of heat than those with asbestos center pressed on the wire gauze; in squares. Size,em................ 10 12 15 PEP SQUATO 7-7 eh ene ns ee ne RR were nee ee EE ela ee 35 45 DO Wire Gauze, as above, in circles with metallic binding. Diameter, cm....... 10 12 15 IRErs SQUAT est ya ces Tera REE Se en .85 1/00 estos Wire Gauze, of tinned iron wire, with hemispherical asbestos center. MUZE WINCHES! myers esr coe ele els Sa siete arse ste aisle er aisins cea eee 4 5 6 PeriSQUALe se cavcpse a ee elke are eT eee te oe To Rr eee eee 45 55 -60 554 Seeeee or OneR He © ir Oo eM TA Js-Hc 0. M Pp) A ON ¥ APPENDIX Mendeleeff’s Periodic System of the Elements Revised by CHARLES BASKERVILLE 2 Zero Group Group Group Group Group Group Group & Group I uu mi IV v VI vill Ox 1 y H=1.008 2 He=3.99 Li=6.94 Gl=9.1 B=11.0 C=12.00 N=14.01 O=16.00 F=19 3 |Ne=20.2 Na=23.00 Mg=24.32 INI 97 (a1 Si=28.3 P=31.04 S=82.07 Cl=35.46 { |Fe = 05.84 4A=39.9 K=39.10 Ca=40.07 Se=44.1 Ti=481 V=51.0 Cr.=52.0 Mn=54.93/ Weare \ (Cu) 5 Cu=63.57 Zn=65.37 Ga=69.9 Ge=72.5 As=74.96 Se=79.2 Br=79.92 Ru=101.7 6 Kr=82.92 Rb=85.45 Sr=87.63 Yt=80.0 Zr=90.6 Cb=93.5 Mo=96.0 Rh=102.9 Pd = 106.7 2 : (Ag) 7 Ag=107.88 Cd=112.4 In=114.8 Sn=119.0Sb=120.2 Te=127.5 I=126.92 Sa =150.4 8 |Xe=130.2 Cs=182.81 Ba=187.37 La=139.0 Ce=140.25 ((Pr=140.6) |((Nd=144.3) Eu= 152 | Gd=157.3 9 — — Er=167.7 — \Yb=172.0 —_ — OSs 190.9 ae nel a -_ os Bs = a = r =193.1 10 Ta=181.5 \W=184.0 Pt=195.2 (Au) 11 Au=197.2. Hg=200.0 Tl=204.0 Pb=207.10 Bi=208 12 Nt=222.4 Ra=226.4 Th=232.4 U=238.5 Rare earth metals not placed:—Dy=162.5, Lu=174, Tb=159.2, Tm=168.5. International Atomic Weights for 1913 * O = 16 Name Symbol point Name Symbol Went Name Symbol Weight Aluminium......... Al 27.1 Holmium........... Ho 163.5 Rhodium............| Rh | 102.9 Antimony........... Sb | 120.2 Hydrogen.......... H 1.008 || Rubidium...........| Rb | 85.45 AT COME Y. Osco Neae A SP).) |i) WIG FI o5 ona cans In | 114.8 Ruthenium......... Ru | 101.7 LATE CYT ORR apenas As (AROGeilodine. sees I 126.92 || Samarium.......... Sm 150.4 DANA oon gamma eres Bape sicodes| Piridinum=s sss rs rae at Gon Scandium..........| Se 44.1 Bismuth............| Bi | 208.0 90) See See ee Fe | 55.84 | Selenium........... Se | 79.2 BOLOM oe ol) 11.0 Kayp toner Kr 82.92 Silicon. Si 28.3 Bromine............| Br | 79.92 || Lanthanum... .... La | 139.0 Silver ce peererres Ag | 107.88 Cadmiumecce eee | Odi 12240) leads... : IE e201 Om |e Sod lumen eee ere Na | 23.00 Gaesiumite-.ss-. oe Os: | 132581 Lithium....... Li 6.94 Strontium. ......... Sr 87.63 Waleinm~. os Can P4007 eutectum=. 5 0s) lu) 7420 Sulphur eee Ss 32.07 Carbone ne... koe: (0; 12.00 Magnesium..... -| Mg| 24.32 antalwumeeseresece Ta | 181.5 Ceriumes otis). Ce | 140.25 Manganese... ...... Mn 54.93 elluriumse eee Rem ie7e5 Ghiorine cc 5.- 6 ... T Hy OF Me A Ss INDEX An endeavor has been made to make this index very complete in that articles are indexed under the principal words of the name and in addition under the author’s name, thus, ‘ ‘Blair’s Water Bath’’ will be found under ‘‘Bath, Water, Blair,” ‘Water Bath, Blair’ and “Blair Water Bath.” As the authors’ names are printed in heavy face type and in alphabetical sequence, the usual Authors’ Index is omitted. Page A Abati Drying Oven............. 375 Abbe Apertometer............. 324 Camera Lucida, B. & L... 316 “ f Zeiss.... 324 “ Condensers, B. & L...... 315 sé ss ZEISS eyes, 4/2 320 “ Microspectroscope........ 324 “ Refractometer........... 466 seuspectral- Ocular. s-.ce5-- 324 “Stereoscopic Ocular...... 324 Abderhalden Animal Cage..... 11 Apparatus for Di- alyzing Method... 177 G3 Apparatus for Op- tical Method..... 428 = Cylinder for Hy- draulic Press..... 437 ss Diffusion Shells.. 177 ne Electric Heating Device for Polari- BCODES hein aerate: 428 sf Flasks and Tubes. 177 se Polariscope Mubes' scm. 428, 434 = Reagents......... 177 s Teste Pubes... 177 =e MRONGS* hey. cree 177 “ Water Bath...... 177 Abel-Pensky eek Point Test- See erst cers 368 Absorption Blocks RO sar casi 1 Cells for Spectros- COPY scene nesses 504 4 ibes Holint sy. . ee. 543 AMcoumulatorstec. cnsnves sees 66, 67 Atcetometer; Otto.........-- 2. - 1 Acetylene Humerea et. 92 GasWMank- ne io cock 441 Acetylization Flask............ 218 Achromatic Objectives, Zeiss.. 321 Substage Conden- RE) lence bo eepopic 315 u Substage Conden- sers, Zeiss... 3020 INCIGUBASINS? sents tee ce oor toes “Bottle and Pipette com- bined.. 350 “ Burette for Milk Testing. 350 =) Measure ““ - “ 350 PAMELUCDOLS nln crs soeteysiere ie 3 1 \ 1200) SepuoSeEEeemabocteas 1 Ackermann Automatic Reckon- eshare agate she tevetorsrs ere 351 Acme Safety Burners........... 92 Adam Galactometer........... 351 Adapters for Retorts.......... 1 Adhesion Machine Kirchbraun- Sargenteccemeeeee cnc 15 PACNESLVe MaDe esr tires cies 75 Adiabatic Calorimeter, Riche.. 104 Adjustable Oculars, Zeiss...... 264 “ Supports for mek logical Work. ...401, 402 AgarvbiltermPaper ce... s6 ee 216 Page Ap atGUVIOnUATS eye erence 362 Adi COMpPressOrssanaee nee eee 1to6 Air Liquefying Apparatus...... 285 Air Melting Point Oven........ 18 ihe IN Sh negadossodesoe 1to6 Air Pumpublates tren seccercce 6 SSE URECEIVErSs.. ce soe eee 71 LOMISE X00 o} FS epaqnadsonaee Goeasee U SulestersWolpertecerer cerca 7 “Warmer and Anaesthetic Bottletieasctsasien-carnees eee 403 Albuminometers............... 543 Alcohol Blast Burners, Barthel 95 IBUINELARep crass ee 97 We ILC asemagaaneeeeouae 283 SS Stoves) parthelss eee 98 Alcoholometers (Hydrometers). 273 AV embicstry- merce nies nee: 465 Alexander Glue and Gelatine MBEStED Sen sactec cc cieee 261 ef Viscosity Pipette... 261 Aliphatic Amino Group Appa- ratus, Van Slyke..... 367 Allkallimeterseaceaceemace seen en 7 Alkalinity Flask, Volumetric... 224 Allen & Moyer Orsat Gas Analy- sis Apparatus.... 245 Allihn Condenser............... 152 “Gas Washing Bottles.... 251 “Normal Thermometers. . 532 Alpha Ray Electroscope, Ru- theriordeeeerer chee seer 464 Alsop Drying Oven............. 380 Aluminum Beakers............. 68 ss DISheB ye sciiasace ee 180 sid Screen, Zeiss........ 448 66 Shields for Centri- fuge Tubes...... 115, 116 “ Weighing Dish with Counterpoise. . . 180 ss WHITES cascaitrcet aye te 554 Alundum Combustion Boats... 149 < Tubes... 149 se Crucibles........ 157, 160 es Dish for Incinerations 178 ce Extraction Thimbles. 205 Milter Conessaeiase a 213 Se ADE Ocees aeons 212 ss CSS IDNEINS Gieagoaeee 213 ee Filtering Crucibles... 160 ef IMME S ie. stereres et ere . 364 a Pyrometer Tubes. ... 458 ee Refractory Cement... 7 e IR Rss ornare ieoaEee 149 ss PRUDES A setctra se weciscae 7 Amberg Swimming Cups....... 515 Ammeters and Milliame- GOTSiee tee ees 200 to 202 Ammonia Nitrogen and Urea in Urine, Folin’s Ap- PALATUS TOR sca eee ss - 543 sf StL eee acnyacces 190 s Trap for Folin’s Ap- DANA GUIBEe eremrcers ce cee 543 AMPOULES a Me ates ee Kae 7 Ampoule Sealing Burner...... 96 559 Page Anaerobic Culture Apparatus. 8 Anaesthetic Bottle and Air Warmer, Brodie...... 403 Anaesthetizing Valves......... 403 Analytical Balances........ 46 to 51 ee Weights......... 62 to 64 Analyzer for Curves, Jaquet. . “ Micro Polarisation 317 Anastigmatic Magnifiers, Zeiss 288 Anatomical Charts, Human, Lendenfeld....... 124 ss Modelstaeeiactec: 9 Anderson Petersen - Palmquist Gas Analysis Apparatus..... 249 ANeMOMe tessa eer 10 Aneroid Barometers.. ........ 65 Angle Thermometers.......... 584 Animal Balancer ascenaccecda 10 Bladders. . 73 SY WBOarG yn oace asi cisrasts a 10 SU CRCCS se err l de 10, 11 Sm Holders acme 11, 12 SS JATSE oer ies crite ile ab. sce ables Brodiese sere 12 Annealing Cups tris arcraroereie eraeel = 12 Anodes blatinum cere eer 420 AN OXY SCOPE meaner 416 Anschiitz Normal Thermometers 532 Antitoxin Culture Flask....... 171 PAT VAS io forsys: ct severe ste jsierote jennie keer 13 Apertometer, Abbe.. 324 Aplanatic Substage ‘Condenser, (UCAS DS ie ss Substage Condenser, VAS Seema cro Hae se mri pletsaeeectarernt 287 Apochromatic Objectives, Zeiss 321 Appliances, Measuring. . .290 to 296 Application Goniometer, Pen- Ll dies cirerstwereia 352 ANDVRON oooudoowsongecousoRoses 13 ee PAISDESLOS! os, setere sielevae tes 14 IAG TTS em os oe OUT ObIEe COOObet 13 Are Furnaces, Electric......... 241 “ Lamp, Mercury Vapor, Her- EUS het ere eesiarsveciare 503 Seeman for Microscopes. . 331 “ “cc Mer- CunyaAVapOleearer 332 es “for Photo-Micro- graphic Apparatus Weuletl.cxose nsec 340 s “for Projection Ap- DALACUSN pee eres 447 Areo-Pycnometer, Saxe........ 273 ATS ANGUs Win Chaser eee 91 Armored Thermometers........ 534 Arnold Steam Sterilizers....... 41 Arons Chromoscope............ 146 Arrhenius Conductivity Cells.. 390 Arsem Electric Vacuum Fur- nace. Vaete nai ete ee Arsenic Apparatus staiaisponpeayatecetede 14 SOYA een acta alsa ae amactc 14 Artery, Canulaeraeracicinac irene 402 SSO" ‘ScissOrvsiewrierss cieleisie Dee 184 1h el (Ws H. ee 18 si OWN oS Page Artificial Respiration Pumps 402,403 Asbestos Aprons, Board, Ce- ment, Cord, Gloves, Mats and Paper...... as Wire Gauze......4.... 554 Asphalt and Tar Testing Appa- TA GUS). ferree pean eee 15 to 19 sa epEly drometentan. =a 273 = Thermometer......... 534 Aspirator Bottles. ...........-. 75 Aspirator (Syringe)..........-- 519 Assay Balances .... dn Nea gee yu) “~ Combination Furnace, IBrOwDeeeeeee. -) 235 SuG@ruciblesaaacerr 156, 157 soe HIASKS Aap ac misicereete nee ac 218 Se Mba ee oe crcpepottocsrscorsmoateds 161 Lo) MANSY Wares ooooenae doe 63 Atomic Weight Charts......... 130 “Weights for 1913.. 2500 AttomeModelSas- aren cnn. 19 Atwater Bomb Calorimeter. .... 105 < Dessiccator sss seers 175 Autoclave, Force, for Cement.. 111 for Chemical Diges- tions ( Digesters).. 20 . Steam Pressure Ster- ilizers.... 37, 38 Autocollimation Spec trose ope, SONS sasagoue “Autogenor’’ Gas Generator... Automatic Burettes....... ok Laboratory Micro- COMER nye cosy frciss eaten 343 Ripeutestes. esse 412 < Precision Microtome 344 < Reckoner, Acker- MANNE eee EOL cf Respirators......... 474 ss Shutter for Micro- Photographie Appa- MAGUS Iilectracterecweiaes 338 INTE ROYETET G) Memewa nce acd kee £ 416 Axial-angle Apparatus, Wiilfing 353 B Babcock: Bottleseu--a- cee. eee 390 Se Milk Testers......349, 350 ee Ripeties esses 350 Bacteria Counting. Apparatus... 155 " Grinding Appara- GUS tates say saatern 166 to 169 Bacteriological Apparatus. .21 to 45 CHartsseeeee 125 oe Fermentation sRUDES ee eceset= 209 Filter Appara- tus.......209 to 211 Incubators. .21 to 33 oe Syringes. .516 to 519 Barasse:@utteraeeeees: 297 Bags, Filter................ See Dil scree Gras ssareroer test: sean Pa) Baier Thermometer....... . 466 Bailey Crucible Holder.... 160 Bain Washing Apparatus for Microscopic Material..... 546 Baker & Adamson Filter Paper 213 iBalancesiscrs--ereesconee toe 46 to 61 es Amal ytiealle eevee 46 to 51 oe forAnimalssee-seseenas LO ss IASSS Ys eon sete cis <2 52, 53 He for Cloth Testing..... 529 ee Counters: «2 eeecee 59 Page Balances CreamWMlestaec-es-rees 351 Decimal. . MO ioe or et2e "i Dispensing... Reape Ten) 0.0 59 s¢ Gas: sux acess 250 ss lam diysyecvrte eseieiie ee 58 e Jolly Spiral Spring... 58 ss Lecture Table.....54 to 56 Magnalium........... 57 ss Micromeereeecee 53 sf Moisture. 59, 61 se Prescription......... 6, 57 so Pulpeeceecies 06, 57 es SoilPeeceee ae 61 u Solution...... 59, 60 i Specific Gravity...... 58 * MOTSION steer ; 60 es Transpiration . 418 ne sRrip secrete : 59 sf Triple Beam..... Ss 58 B alance Covers se ercret . 64 Ranseep eects .. 64 ss Re ading Glass.... . 64 od IRs pecabeaus ae . 64 a Raidersaqeceocc : 64 Supports of Glass... 64 SS Weights...... 62 to 64 alliNiilla «sete eae 166 Bal OOnS easels eres 65 s for Filtering, Pukal .. 210 ss Gas. . 250 Balopbicens and Accessories... 439 BalsamiBottlesteccg. 6. -sco2e 76 Baly Spectrum Tube........... : Band Tubing, Rubber.......... Barcroft-Haldane-Plesch Ap- paratus for Determining the Oxygen Capacity and Car- bonie Acid Content of the BOO ec cx setarcis op seceoe as eeaetines ale Barcroft-Roberts Apparatus for Determining Differential Pressure of Blood Gases..... Bardeen Freezing Microtome.. © Barkometers (Hydrometers) ... 273 BarmlVisenetstniseccem arc 286 Barnes Dissecting Microscope.. 313 Barnstead Stills......... Sea PL8S: Barometersiccase cites se i 65 Barometer Tubes............ 65 es AN os Goo oadbe 260 Barrett Mfg. Co. Standard Ap- paratus for Testing Coal Tar and Refined Tars, Oils and Pitches Derived thereform.. 18 Barthel Alcohol Stoves.... . 98 ns Automatic Burners.... 95 Basins wAcId teense eee 1 Baskets for Test Tubes..... 522 Bates Polariscope Tubes 431 = Sugar Flask........ 226 of “~~ Polariscope.... 431 Baths, Constant Tempera- ture. .392, 393 “ Paraffine Embe dding . 45 So Pests We eee gee ae 480 “ Vaccine Culture, W: asser- man Test, etc....... 34, 35 ss Water. .548 to 552 es “~ for Abderhalden Dialyzing Method 177 Bat lenies yD iya err er nae ein 66 ss Primary ...........65, 66 By Storage .. es a ae 66, 67 Battersea Crucibles............ 157 «S Miufilest <2 saa cats 364 560 Page Battersea Roasting Dishes.... 475 MY Scorifierss see 481 Battery for Charging Electro- SCOPES ise Hay cle ee oes 460 ee @onnectors?-- 4-2 ee ae 68 ce JaNS ioe cnc Heke eee 68 Baume Hydrometers........... 271 Bausch & Lomb Micro-Photo- graphic Ap- paratus . .337 to 339 ef «Microscopes and Acces- sories... .304 to 317 «Micro Are e < Jbampree eee 331 ne ““ Microtomes and Acces- sories . . .343 to 348 ss “ Petrographical Microscope 355 to 357 Projection Apparatus “ “ and Acces- sories. .439 to 448 Beads, Glass\..---...46- eee 258 Beakers, Aluminum............ 68 3 Copper eee eee 68 ee Enamel Ware......... 68 “ Glass ~ .:.22ct.= seen OO MUOML s Griffns..--.). eee 69 “ Phillips: >. eee sf Porcelainzs.- pepe eee 68 e! Transparent Quartz: . 459 Beaker Clamps. . Bee ee Bechhold Ultrafiltration Ap- Paratus)... aes 212 fg Ultra Filter Dises.... 212 Beckmann Molecular Weight os Determination Ap- PATaGUs eee 388, 389 = Spectrum Burner. .. 502 ss Thermometers. ..... 533 Beehive for Pneumatic Troughs 423 Beet Sugar Polariscopes........ 433 Bell Glasses <9... 39s ewe Baan: NORE aioe ook 6 bcc 71, 72 Bench, Photometer, Stationary 384 Bending Tubing, Glass......... 260 Bennert Manometer............ 289 Benzene Blast Burners, Bar- thel ..:..ja:ccq50eeeeee 95 ss Hydrometer. . 273 Bergmann Stability Test Appa- TAtUS. >. 5... cee 508 Berkefeld Filters.. 210 ee Pressure Filter. 211 Berkshire Sand... 2. .-sheeeeee 552 Bernhard Drawing Table....... 324 Berzelius Gas Holder.......... 253 Berzelius-Pepys Gas Holder... 253 Beta and Gamma Ray Electro- scope, Rutherford.... 464 Beutel Burette Float........... 88 Bibulous Paper: ..2-eee eee 216 Biffi-Brooks Coagulometer .... 266 Binding Posts for Batteries. . 68 iS “Ostwalditeeseeeee _ 394 Binoculars, Bausch & Lomb- Zeiss Stereo........- 72 Binocular Microscope for Pair- ed Objectives, B. & L. 312 Binocular Microscope Chun.... 330 Zeiss.... 325 Biram Anemometer............ 10 Gr 10), sMiewvib? Ao maN) say: Page Bitumenvelolders acerca sede 15 BladderssAmimallé sen sone ee 73 Blair Drying Oven............. 379 «Platinum Combustion IB Oats Ae yaao se eects 421 > Platinum! Dish. 22)... 422 “Stirring Apparatus....... 509 ceo aWiateribathevn.). .ctyrctctelalv 548 Blake Pinning Forceps........ 227 Blast BlowersensRecceea cates 73 (Staining eee. aa oernn 507 3 Mubeseete ttre tae 193 Dennis-Orsat Gas Analysis Ap- LI iw tollaer nn sogemo ocd ac 180 ss “« Caleium Chl DALAtUS Hen enyyeccl i serene 245 “Transparent Quartz. ... 459 Tides. fc. 9, 100 Dennison Labels...........282, 283 sO Weighing )..92c2.227 180 Drying’ Rube and Potash Bull Dennstedt Furnace for Elemen- DishiClampseesassseeenee cee 142 Combined, Vanier........... 193 tary Organic Analysis........ 239 Dispensing Balance............ 59 DuBois Reymond Contact Densitometersescnt- tices a! 387 sf Buretter cence 88 Key tase 395, 402 Dental Mame cece eel 478 Dissecting Instruments. ..181 to 185 fe “ Inductorium, 402 Denver Fire Clay Crucibles.... 156 Mufile Furnaces. 235 Fuess NGnochTOM ator 500 and Moyer). .<.26- =e 245 ‘ Radial Burner........ 97 “” Spectrograph . _ 497 Gas Analysis Apparatus, Burrell 247 Seicty Buren veeeeees ae Fume Absorption Tube, Folin 543 os Analysis Apparatus, Hal- a ee Solid Flame Burner... 95 Funnels.................228 to 230 ane..... bette eee e eee eee cee ee Water Heater........ 552 “ forburettes: ... nen. ss Gas Analysis Apparatus, Loms- Flexible Copper Tubing for “« Copper......... 229 chakow. ..= genes Apparatus for Em- 42 Hydrometers............. 271 t0 273) pportars a aoe 20 Hitche am Seas Ce ene ult sIp Hy drometer, Asphalteaececce cc 17 Syeitie's (ec Tossioe il Ae lichens/oyringess- a noes ee 516 Tae 173 Hoffman Clamps... ....-- EOE Hygro-Autometer............. 274 J “Direct Vision Spec- Hyprodaike entre co sence an 274 A Me c ss tTOSCOPE a. coeeecrn ee e's 104 ry prosrapheeeeeeeeen eee 274 Jackson Specific Gravity ae ie S Lecture Apparatus... 283 Hyco She. 2p eT ee UE OA, 274 paratus...5.2---ee , 492 Hofman codiant Prete eee dope ce : “ — ‘Turbidimeter........ 542 Hofmann Water Bath.......... 548 I Jam) Jarsin.630. cone 281 Hofmeister ‘“‘Schalchen’’....... 481 Jena Blt Burner 54 \senroeeee ae Hogarth Specific Gravity Bot- TeeiRores 45 ‘Japanese Lens Paper.......... TSA A eces | eA i 3 an Te AQT ek ORES Cae 3 Jaquet Curve Analyzer. ....... 408 : Iler Dise Pulverizer........... 162 re . Holders, Fae Saadadde ao ce Illuminants for Projection Ap- 2 Graphic Chroncue ae CAS ee ORE apa ee we Meh cc “ Crm UCU eS Illuminating Device for Po- «“ R He P 404 rucibles...... 160, 161 Intishopeser Cee 432 aes sep leHon at pparatus. ee hs culture Dishes. .. . un Illuminating Device for Spec- i Sancta Ieee pith x re Tee Seabee ese 313 troscope with Polariscope, ie Jars Ae ee SS il. - * SES oe icjeeisine 3 NESTS ee eRe meet IL AC ars, £ Weeadeoohsckcc ccs < i ss zs Rncrotonie Knives pe Iliumination Tester, Thorner.. 386 . ee ee aces === a Ai tc Spex fo Shaheen 506 Illuminators, V ertical, Bec leecolits Yee Bell SAS CRERBSRScuscc ct - 71,72 sities Spectrum Tubes. oe Weiss B0k. Bell... me Ce ed Iluminometers, Martens. 385 "7. er ed see eee eee Teneerittn een ae __.Wingen..--... 385 q Gelsium Chloe: Sa 280 JoScdrogercen Immersion Electrodes......... 391 ee Se ae i Rae Hones. eae e seis ac ay « Gilkpotilccee 77 ; Hydrometer eas ee us St ae BS eee aa ae = = Refractometer...... 467k pecan Seer Hopkins Cond 1 281 on een S Sega ee el te Immunity Unit Cylinders...... 174g Lighting 2s aaa 381 Picard-Law “ Pipettes....... 415 « Wiking 34 Modifica- = ‘impact BallMestersa-- sce 267 ce RS i Soe cation. .... 152 Incandescent Gas Micro Lampe 332) Ve Museu Bees 276 to a s Kjeldahl Connecting Incineration Dish, Alundum.... 178 = « Satses Valve wea eS 381 IBulbsiot pt anceeee ees 366 Pan, Platinum. . - 421 « Seren Cap ene SS 381 Horismascope. 5.22.-..-2sce--- 543° Incinerators camcrcneceoae ase 215 (ee) ag se een 1a Gy ansad) Ne cacooameraooadLenc 481 Inclinator, Carboy............ 1 Occ SEneoee Mame eS pul ah oopatulass «2 citcg.ctee sone 490 Incubators, ee 21to33) « Waste... > 989 sf {SPOONS saeieceoesaaeeee 506 Embryological..... 29 BAe CoS Horseshoe Magnets............ 286 us for Microscopes... 333 Jofters Counts Boasoso ae Hortvet; Tubes soo-csscn ein. 542 Incubator Thermometers...... 534 Jennings KjeldahleConnestar Hose wRubberse nee eee 478 Indicator Potentiometer, Leeds Bulb” J s 366 Hoskins Electric Combustion & Northrup. ........ 451 Jewell Sills... ee 188 Furnace...... 237 se Temperature, Leeds 0 WN Sees tt eee fs “Crucible Fur- & Northrup......... 452 Johnson Apparatus ave Deter NACEHo ose 2390, induction Coils -peeeeee eee 275 mining Hydrogen c a 167 LaWall Separatory Funnel..... 231 Low Temperature Burners..... 97 id Cultureyblaskst. cess 171 Leach Separatory Funnel Sup- focuses 2 Safety Burners......... 98 DOLL cere ee aetna etc tetas 233 Hearson. 31 Kohl Specific Gravity Bottle... 491 Lead Dishes................... 130)) ys s§ Incubator — Kohlrausch Conductivity Cells 390“ PIPO.kac arsucacran aera oes 412 Giddings.... 32 Model for Lecture MESH OU eeetsttuisa ioe went roma Bes} sf Thermome- Table Demonstra- Leather and Cloth ‘Tester, terse... 533 tion of the Migra- Schoppersac acters oes Seer aa 525“ ss Thermostat.. 285 GIOMIOL LONS sae sec 397 LeChatelier Pyrometer........ 451 Lucksch Bacteriological Charts 125 = Slide Wire Bridge. 394 Soundness Test Ludwig Electrodes............. 402 s Sugar Flasks...... 226 Apparatus for Ce- Ludwig-Cyon Mercury Man- Kohlrausch-Holborn Conduc- MON Gig fay tant cle 112 ometer. j5snct aneeeeeni eee te 400 tivity Cell 390 s Specific Gravity Luensyrinceseeee eee eee eee 519 Ge “ Platiniz- Bottles........ 114, 492 Luminescence Microscope and ing Solu- Lecture Apparatus, Hoffman... 283 Accessories, Zeiss . 328 tion. 394 cs Table Balances........ 54 Lummer-Brodhun Photometer Kohlrausch-Ostwald Apparatus Leeds Diamond Mortar........ 362 Sicht=Box-eee eee eee eee cer 384 for the Determination of the Leeds & Northrup Resistance Lummer-Straubel Mercury Va- Conductivity of Electrolytes 390 BOxenaces 394 por eampse neces eee O02 Kolkwitz Plankton Magnifier... 288 & s Slide Wire Lunge Distillation Flask....... 222 Kolle Culture Flasks.......... 171 Bridge..... 394 $) Nitrometers:s.. seer. 367 “ Tnnoculating Needles. ... 364 Lehmann Cardiograph......... 407 “Weighing Bottle........ 553 Konig Centrifuge.............. 123 Extraction Tube..... 205 Luther Capillary Electrometer “Differential Manometer 290 ie Bere Leister: 407 Tubes rishi Oia eer ree 395 “ Spectrophotometer with & Sphygmograph....... 407 “Platinum Electrodes.... 396 Wanner Pyrometer...... 457 Tenden tela Char ts of Human “Stirring Device........ 393 Korner Drug Mill............. 165 AMATO Ve cece ernie ee 124 Lux Gas Balance.............. 250 Kossel Sodium Press.......... 488 Lenses, Pocket................ 286 Lymph Grinding Apparatus.... 168 569 tT) He (Oy eMe Awa a CG. (0) Mee Pe aA Nae Page M Maassen Filter Cylinder....... 210 Macfaedyen Bacteria Grinding A PATA LUS sole eietaee eel teyietere 167 Mach Decimal Balance........ 54 «Immersion Oil Bottle.... 77 Mackenzie Ink Polygraph. . 405 Macro and Micro Polariscop>.. 427 Magnalium Balances........... 57 Magnetic Field Electrolysis Apparatus Seas atel sieietierctowiseraiche 200 IW ate pepe Eeans copa onod 286 Magnification Table........... 322 Magnifiers, Bausch & Lomb.... 286 Zeiss ‘Anastigmatic. 288 s for Balances. esterase 64 Magnifier Stands, Adjustable. . 313 Mahler Bomb Calorimeter..... 102 Mailing Cases for Micro Slides 335 Mall Seeker, or Probe..... see l84: Maltwood Finder.............- 324 Manganese Tubes for Color Comparison, Camp.......... 143 Manometers......... Ge orasonot 2 Manometers for Physical Chem- IGLH AO Ree Seo oe DUE oe nEs Oo Coe 400 Mantels for Berkefeld Filters. . 210 “ Welsbach Lamps... 331 Marchand Calcium Chloride SRUDeS Sao ac cicirasinatcoyseies sees 100 Marey ‘Tambours --s---s20-ee-c 401 Marey-Straub Tambour........ 401 Markers oienalenrenaaeiaceces 401 Marquardt Combustion Tubes.. 149 Pyrometer s 450 Marking Apparatus for Micro Objectsaee ees ee 333 Marshall Apparatus for the Determination of Urea in IBlOOd eae anesioee sees 266 Martens Densitometer......... 387 Direct Vision Spec- ULOSCOPE aise sie 493 “ Illuminometer........ 385 s§ Polarisations Photo- MCLEL.. weees sete sem 386 WY Relative Photometer.. 385 Martin Culture Flask.......... 172 Gs Double Jet Water Cen- LULU LO Secrets aes ie 117 “¢ Filter Apparatus....... 209 Mason Hygrometer............ 274 Mats wAshestos=.5 1 eceaccc co 14 Matthews Water Bath......... 551 Mattrasses for Blowpiping..... 286 Maximum and Minimum Ther- MOMELETS .qosesele saad 535 McCoy Boiling Point Appara- HUSA thoes cee 389 “Gas Generator . : 253 McLeod Anaerobic Culture ‘Ap- DALAGUSE oS eerie hy -yarare 8 oY Vacuum Gauge........ oD McMyn Weighing Bottle....... 553 McNeill High Vacuum Rotary Bumipretecie sare bocce Serie) es 6 Measuring Appliances. ........ 290 Se Microscopes........ 291 Measures Say sanae estes aie ois 290 Measure for Acid in Milk Test 350 SS" VEADGaaiek sins eestero cnet 291 Measuring Cones............-- 291 s Tubes for Gas...... 253 Meat Chopper................- 297 Page Mechanical Stages, B. & L..... 316 ce ss Zeissie ee 320 sé Stirrer for Mole- cular Weight De- termination Appa- TAtUS! S40 eee 389 Medicine Droppers...........- 412 Medium Laboratory Micro- tome'sc. 6% desc ae Semele 343 Melting Point Tube. 297 Mendelejeff Charts of the Ele- MENUS! ers nee 130 ce Periodic System of the Elements..... 555 Meniscus Reader for Burettes.. 88 Mercury Commutator......... 395 fs Manometers.......... 400 « Pinettes is se. ce ence 413 sf Still}, Hulett... 22.2... 297 s sRrouphss-ere. cae cee 297 ss Vapor Lamps...... 502, 503 = «Are Lamp, for Microscopes... . 332 Ke Wells for Armored Thermometers........ 534 Mesuré and Nouel Optical Py- LOMETERS cease teers 455 Metallic Tubing, Flexible...... 542 Metallographic Apparatus 298 to 303 oo Microscope and Camera, Tassin 300 Metallurgical Microscopes 298, SOONSOI, S02 ee aac ose 303 Meters, (Ch eeerodor cance or 5 2565 SDBohtT eer ete hee 404 sc “for Junkers Ca- lorimeter......... 108 Meter Sticksania ee caseesicace 290 MetrickPablestereenaseemae en cies 556 Metronome, Jaquet............ 400 Metzner Respiration Valve. ... 403 Meyer Anaesthetizing Cham- Dershes eee ae ee 403 “Artificial Respiration ApparatUsts-c6 seen ee 403 «Cylinder for Hydraulic Pressesta- on Somat 437 “Dissecting Microscope. 327 “Sulphur Apparatus. 512 Mica Covers for Brain Sections 334 Mice Holders’sse- pepe 11 Micro Balance? 2-2 -snek eee 53 Ss IBUINER Ao eee ee 91 - ‘Cover Glasses. = ...5.....< 334 “Drawing Apparatus. .... 317 “Labels for Slides......... 335 AEIMERY ae ayers seo abs «Fat Extracted, for Milk Analysis. ......... 350 Co ilteree eee elo ctol2i6 SC SGlazed cette eves 382 s <<) for, Hymographe: 398 eee WILENIS nos eo rae 284 “Mounting, Botanic val. 75 so) Parchmenthen eae enose “Pressing, Botanical...... 75 Paper Filtering Cones......... 215 “Testers, Schopper. . 525 “Thickness Gauge. so AS Paraboloid Condensers, B. & L. 315 - Substage Conden- sers, Zeiss... . 320 Paraffine Embedding Bath.. 43 Box. .. 348 re ss Ovens. ..42, 43 ss as Table..... 348 Parasite Incubator, Hearson... 30 Parasitic Protozoa and their Carriers, Charts of .. 13 Parchment 'Papetacc.-niess >: <= 382 Parr Carbon Apparatus..... 110 ‘ i\GasiCalorimetermanenn..- 107 “Oxygen Bomb Calorim- Git mR e REE SOS caOeoe 102 “Standard Calorimeter.... 101 “Sulphur Photometer...... 512 Paschen Galvanoscope........ 201 RastevBoard'Boxeswasscee- cei OD Pasteur Culture Flask......... 172 Pasteur-Chamberland Filter Cylin- ders. 210 < se Pressure Filter. 211 Pastille Press . 389 Payne Platinum Dish. 421 Pebble Mills. eA 166 Peligot Calcium Chloride Fubeseeeeeee : 100 Pellet Polarisc ope Tube. 435 Pencils, Litmus..:........ 382 ee Higa © See Mig Pencils Waxceaascees hese Penetrometers................- Schutte........ Penfield Application Goniom- eter Pennock and Martin Crucible. . Pensky-Martens Flash Point Mestersie.cser tec cme Pentane Lamp, Harcourt . “ Thermometers for Low Temperatures......... Peptone, Silk........ =A Percentage Scale for Ceme ont. Percolators........ Percolator Bottle... . Perforated Porcelain Plates for nunnelssaeeeeee Permeability Testing GUS eather eee ete =e Permin Safety Pipette Perot-Fabry Mercury Lamp. iit rs oe Per Se Sieve Shakers . Peters Electrolytic Support... Petersen-Palmquist- Anderson _ Gas Analysis Apparatus. . Petri Dishes. . Petrographical, ic ryst allograph- ic and Mineralogical Appa- TALUS!) soot: = 352 to Petrographical Charts Microscopes 355 to Petrological Collections. .. Pfeiffer Micro Warm Stage. : Pfurtscheller Zoological Charts Appara- Vapor Phillips Beakers.......... Phipps Institute Animal Cage Phosphoric Acid Flask, Volu- IMOGELG rie yayecieieistessians sey Phosphorus Tubes, Goetz...... Photographie Camera for Spec- troscopy. . Ss Plates, Wratten and Wainwright for Spectroscopy. Register, Dodge.. and Accessories 382 to “ Photometers Sector Spectro. meets Sulphur Parr. Photometer Sight-Box. 2 Standard Incan- descent Lamps. . Photo-Micrographie | Appara- tus. . 337 to Photo-Micrographic Apparatus for Metallography. 5 Photo-Micrographic, “Drawing and Projection Apparatus Combined. secrete Photosynthometer............. Physical Chemistry Apparatus (Not including Apparatus for Quantitative Electroly- sis) ... 888 to & Physiological and Clinical Ap- PAlatus ee sa es 398 to Picard-Law Modification of Hopkins Condenser...... Pick Glasses... Pill Boxes. . : « Knives...... Photometer “ “ or I bo S Page 382 15 18 Page Pill Tiles... 3 sass seaoncte eae 412 Pillsbury, Boxesieyyss seals etl: 335 Pins, Insect... cecnee eee 412 Pinchcocks, Mohr............. 142 Pinning, Horceps: 1. eee 227 Piorkowski Culture Flask...... 171 Pioscope, Heeren... ee eee 350 Pipe, Blocks Tine. .7 seen 412 ( Tkead 2s 0. See ee 412 Pipe Wrench). 22... 45s ee eee 423 Pipe-Stem Triangles........... 539 Pipettes:/......40.5.2+: eee 412 “e Automatics 412 ss Blood, Wright’. -2-..5- 267 ee Certified :, 2: Sas. of Dropping: .>-eeeeeseer 412 es Gas... .slso cee 256 ef Haemacytometer..... 263 = Mercuryns 2) oeeneeee 443 ss Milk, Babcocks:..---- 350 Ostw ‘ald, for Folin Ap- paratuss oe 543 aa Serological. . 413 ‘ Transfer... 2 413 s Viscosity, for Glue.... 261 os e CAO oeG. Sy Volumetric s.sse: eee 413 Pipette Boxes..... 415 Rest. 415 me Supports.. ] se ele Piston Recorder, Hiirthle...... 400 Pitch Mould& >see eee 18 Pitchers, Acid. . cae eee ull Placentapeptone . 3.3} tok Le Plankton Magnifier............ 288 Plant Pathology Charts....... 129 ee Physiology Apparatus, Ganong... nen 416 to 418 ‘ Physiology Charts....:.. 128 € Préss;) oa. eee 75 Plasticine for Anaerobic Cul- ture Apparatus? =. -eesseer 8 Plates for Air Rumpse eee 6 Color Reactions. eee 419 ef for Desiccators. ...----- 175 U: Glass, for Cement...... 419 s Hot, Hlectrica.. seen 268 ee ©” Gas i524 tee 268 “ “ with Flask Heater.. 270 170 cS Petri, Culture “Perforated, for Funnels--eeeeeeeee 419 “Photographic, Wratten & Wainwright, for Spec- trOSCOPYA. see eee 506 < “POrouS'...)-. center 419 « “Siliea.o22 nee 419 sc Streak: .5.c) seer eee 419 Plate Holders for Micro-Pho- tographie Apparatus......... 338 Platinid Wire for Inoculating Needles..,......... «eee Platinizing Solution. .......... 394 Platinum Ware. ae 420 to 422 Blowpipe Tips....... 74 a Hlectrodess-. sees 396 § Needles’ =): 222 eee 364 e Resistance Calorim- eter Thermometer... 105 s Resistance Thermom- eters:\....- cones os Rhodium Couple for Brown Pyrometers... 450 <¢ Wound Tube Fur- naces, Heraeus....... 238 _———— Ee AGG stiGush «Us JR Hr lee giGe Owe Moa Ay cS CeO) Mi a Per Acare Ni eye SS ee eee Page Page Page Plattner Crucible.............. 159 Porous CupsiornCellseeeee eee li2e Pumps ACId sees eee aneee 1 ce Diamond Mortar..... 362 Plates! Ssceascceitons siec 419 Aart So eee ae se eein 1to6 Plehn-Nuttal Microscope Oven 333 Portable Microscope, Bo O'9 Wis 5 5 Gull s Artificial Respiration. . 402 Pleier ‘‘Raumwinkelmesser’’... 386 Zeiss..... 323 ts Compression for Gases 151 Plesch Chromophotometer..... 147 “ Polygraphseesenoeecee 407 “ RteLee eee 217 Bb ersten eens eee hake 423 sf Projection Apparatus. 441 s Pressure sepia see 1to6 Plucker Spectrum Tubes....... 505 Posts, Binding, Ostwald. ...... 394 e Suctioneeeeee eee lto6 pale yy secede ee nese BODmeROLaSsbUD Ulbssee ere eee renee: 436 - ane! pressure .. 218 Plumbago Crucibles........... 157 Potash Bulb Support...... one 436 oe Vacuum..... 1to6 Pneumatic Troughs............ 423 Potentiometer, Fischer, for Purinometer Hall.... 543, Pocket Magnifiers Bechet c Meee Bone 286 Cathode Potentials.......... 199s SEvcnometerss eee eae eee 491 LS Spectroscope........... 492 Potentiometer Indicator, Leeds Pyrometers. ap 449 to 458 Bae tnermometersac esa. 535 Northrup. ane eee 51 Pyrometer Cones, Seger. : . 458 PohliCommutator,. .-22-..- >... 402 Potentiometer Method for s§ oT ubes, Alundum.... 458 Polarisation-Colorimeter...... 145 Electro-Motive Force Ap- Polarisations Photometer, Mar- PATACUS Se tts tAcles eens 395 Q UGS 'o Bonbone pEaee ce er eee 386° -Potometer., Seensss seems esr 417 = Polarisations Photometer, Nut- Pouring Mouldsmaeneee see 364 Quartz T RPAreOUs, Transparent a0 LTT PRO reser eee hey ch tubs 496 Prat-Dumas Filter Paper. ..... 216 fe enses Gig neo 2 ; 3 Aree Mercury Vapor Lamp. . 503 Polariscopes and Accessories Precipitating Jars. .-.sss0ss4-- 282 “ P tonal siete 450 424 to 435 Precision Burettesh sean. .t soe: 89 “ cent we a CBI 300 Polariscopes for General Pur- Flasks, Volumetric... 225 e Test Plat Sas spate Pac poses... .426 to 428 es Hydrometers. .... 271, 273 3 ce BATES) NOW Teer enal 435 < “Sugar Analy- = Microtome, Minot ‘ ieee SIR ees a 539 SIS Maeno. 430, 431 Automatic..........- 344 Queven Tiacton ae Shere tga 348 “f “Urine Analy- ¢ Mixing Cylinders.... 174 ee ne eR LOTS BEL Bee esr cit : Magus sscesee 424 ss Bipettes)ae sie sc ace 414 R Polariscope Waseem eset: 432 es Thermometers....... 531 Cover Glasses. .... 435 os Urinometers......... 545 Rabe Water Motors........... 362 sf Illuminating De- Preparation IDI) lo onedaceuene 180 pehacks@hilterseeen serene . 216 vice, Electric...... 432 VALS oes ee: 276 to 281 “for Staining Slides... ... 507 LOLSUPPOLUSte een pasties 475 IRINA EEN ec ggoonBoneaveogloe 94 LOSS SUPDOLUS Ne eiectosieteetislts 514 Ringer Extraction Apparatus 2 Roasting Dishes, Battersea.... 475 Robax Glass Tubing..........- 260 Robervahl Balance............ 59 Rock Crystal Apparatus....... 459 Rocksal ty benses se. 1 «ieee ol 504 Rod, Charging, for Electro- SCOMESseeieeise ceisler 462 < Glassiemeeerec. eke mates 260 ss Sili¢ain Sie etmc dciee certains 489 Gs Stirring, of Glass........ 260 Rohrig Fat Extraction Tube. 351 Rose Automatic Adjustable Burette ys << -c sewers: 88 a @rucible we... - 159 Rosenau Syringe Rack eee 516 Rosenberger Innoculating INeedlest kisses eerie 364 “Ro tametericns sce coerce 256 Rotarex Dulines..ceeeaee eine 17 Rotary Crucible Holder. 161 a Microtome, Minot. 344 Rotating Anode and Stirring Ap para tustrnentasice ra =. 199 Rothe Double Automatic Pi- Petter sass eee 412 Roux Bacteriological Charts 125 “Culture Fl asker ae 171 ss és ube x sya. 172 GO Vishwebiva3nce goon oor SOLO “ Thermo-regulator, Bime- bal lVGh. Sa iscue ceersdeccemmiences 536 Rowntree-Geraghty Colorim- Gila WeopaadocedcssopaoGobe 144 ReERSAlund umes cect 149 Rubber Bands.. Pen Meee a) Bottleas orerec tere 84 se Bulbspemene entree 475 # Bulbs for Dropping Bottles eaves comet eee bk Caps for Dropping Bot- we 1 CS RRR eRe aan 76 s Caps for Test Tubes 476 ss Mame satieseciesecece 478 ss Discs for Foot Blowers. 73 es Extraction Apparatus... 207 as Ringer! Cotssmeea-a--t 476 sf hunne] Sierras aoo, s Gloves: insnecseeasteenc 476 es Policemen cer-siee es 476 s SMM, Gsaseadeosoode 490 on Stopcocka-cr sea-ice 510 ue Stoppersi..: escessrn sac 477 ss Testing Machine....... 527 oe ASSUC oyeadcsshebsterroeters ote 478 574 G: (OF IMtsPe a AgeNiae Page Rubber Tubing) f..6 eek eee 478 ss Stretcher...... 480 sf Viscosimeter.......... 480 Ruehmann Uricometer......... 544 Ruhmkorff Induction Coils..... 275 Ruhstrat Rheostats............ - 203 Rules’... 2.2 asc a ae esr ee 290 Rule, Richmond, Slide......... 350 fC. Slide is....3 sade e eae 489 Rupert) Drops. - ss. -- see eee 480 Rutherford Electroscopes . 464 ss Prism: 5. eee 494 Ss Saccharimeters...-.:-..ceseeee 430 Saccharo-manometer.......... 544 Saccharometers....-.------.e6 544 Safety Burners, Koch.......... 98 "Tubes... J. .- ssn eee 232 “Valve Jars: jee 281 Sahli Haemometer............. 265 Salinometers:. «205 273 Sample! Boxes). <5. 1-1 ieeeree 85 ss Cans for Cement....... 114 Ss Grinders, Braun....... 163 Samplers... 23: --0-- 2) eee eee 480 Sampler, Cement..........---- 112 Sand. Berkshire: ¢- ose eseeeeee 552. Sand’ Baths. = --5- 4--eeeeeeneee 480 << J Grucibles==--.-eeeeeeeees 157 «Glasses yc... eee eee 481 « Sieves > }2e./s:.4-ceeeeeeeee 487 “« ‘Thermometerse s--- sea 534 Sapometer................:..- 88 Saponification Burette..-...-.- 88 Flask, Volumet- TIO. a eee 224 Sargent Automatic Gas Cal- orlmetera. ssa eee 107 cs Electric Drying Oven.. 376 ce High Temperature Bummer. ..: seo eee 93 Sartorius Brain Microtome.... 345 Freezing Microtome.. 345 Saucepans... ... .dva.ceudee eee 75 Sauer Charts of Petrography... 133 Sauveur Metallurgical Micro- SCOPE. eee teens 298 ss Micro- Photographie Apparatus: ses 298 Saw, Bonet. .....ceeee eee 182 Saxe Areo-Pycnometer........ 273 “ Urino-Pycnometer....... 544 Saybolt Universal Viscosimeter. 371 Scale, Cement=>..cossee eee 113 sc Percentage: ac ae 113 Seale Tester, for Thermometers 292 Scalpels. 22: svaceeue cee 182 “Schilchen’’ Hofmeister....... 481 Scheibler Calcimeters......... 99 Desiccators......--- 175 Scheibler-Finkener Calcimeter. 99 Schellbach Burettes=o2-- eee 87 Support. . eeeOLO Schiff Nitrometer. 922-22 4--se 367 Schilling Specific Gravity Ap- paratus for Gast=. see eeeeeee 256 Schimmel Molecular Weight Determination Apparatus for Essential Oils............ 373 Schleicher & Schill Filter Paper .. .s.casd 950 ee eee 214 Schmidt Electrometer......... 462 wo jet wy TR ale ee bie Om Mae AGS G @ Ww ke A IN ¥e , Page Page Page Schmidt & Haensch Polari- Shelf, Digesting, Kjeldahl..... 364 Sommer Hydrometer for As- BC ODES Aer rei ls sraraes Aus sctars 424 to 435 Shells, Diffusion............... 176 Hal te eee ee 17 Schmidt & Haensch (BPreire- foes e em s Abderhalden.. 177 Soundness Test Appz vratus for scopes. . to) ShelliVialsiten.. cons Peete 545 Cement....... 112 Schonjahn Grain Germinator.. 262 Sherrington-Starling Record- Soxhlet Condenser.......... 153 Schopper Conditioning Ovens.. 528 MYND; AL osGanod assodeo hs 399 y Drying Oven..... soe Sie) Testing Apparatus Short & Mason Recording Ther- q Extraction appara atus.. 206 : 525 to 528 MOMELEL Ailes ee ae 534 i - Tube.. 205 Behroedter eelasies Sse ys x Shot, lead. ..... 993 Spark Coils sic eee _ 275 chultz Coagulometer......... 266 Shields arian. {ae Cont rie oDatulastais: ase ern ee roe 9 Schultze Micro Warm Stage.. 333 A ie ee fouCentel 115 at Blatimiumee cee ts Schulze Stirring Apparatus.... 509 . Shovel, Cupel.............-... 172 Specific Gravity Apparatus, Schuman Specific Gravity Bot- Shunts for Demonstration Gal- Johnsons: «tecisne sce: 114 ~ tle ee COS mee VANOMEetCTS te selene 200 oe Gravity Apparatus for chuster Dropping Bottle..... 77 P REN ep telavillimyee, woonqasescecen 25 Schutte Penetrometer......... 18 Spur automates for Micro- 338 Specific Gr: Site Balances...... 28 Schwartz Calcium Chloride Side Neck Flasks BEE So s9 0: Oe «7 Bottles)... 25 491 “il Xo easecie Pones ee eee 100 Sidersky Vacuum Owen ee 4 gi 380 se - Bottle, | Bar- Schwarzmann Charts of Crys- Giemens Water Precmeter. oe 455 rett-Hubbard.. 18 tallographiys ces ses) d- o> - 133 incad = eet ane 486 ss es Hydrometers.. 271 Scimatco Patent Burner. ...... 93 Sheree iByalhitae GEM ee 5 Specimens, Tourmaline... .. 353 NCISSOLSMeeae ear Hoe ouecpadwos ous AS Ou serena Sh k 8 ray aD ASN a a7 Speci TMEN ES OLLLESE ane 6 ttl « Di Graven shorten etl 183 ‘ Shakers sities «ose ssi 487 yey issecting..... Sight-Box, Photometer 384 Boreene A pebobesms bo ee 7 SClELOSCOPC seine terre ee 267 Si Pe se aan peat Ta a a : oe Jars.. Sees HOnbORZSL SCOOPS cat pecan cere Lace 4g1 Signal Markers................ 201 ss Vials 545 «with Counterpoise..... 180 Silberschmidt Filter Appara- Spectral Objective for Micro- Scorifiers, Battersea........... 481 tus... 2.2.2.2... eee ee 210 SCOPE i micies sceeeshee bein e ed Scorer Mongsen-.. 4... . oe. 539 Silica Casseroles............... 110 Spectral Ocular, Abbe......... 324 Scott Glue Tester.............. 261 i Combustion Boats . 149 Spectro- -~Colorimeter...... 145 “~~ Viscosimeter............. 370 a Tubes . 149 Spectrophotometer, Konig, with Screens, Projection............ 448 - Crucibles........ 157, 159, 160 Wanner Pyrometer. . 3 57 SG Ch dd bnithonncneedacaed ae 281 a Distilling Flask. ........ 222 Spectroscopes, Spectrogr aphs, “Compressors for Rubber - Evaporating Dishes. . ... nae Spectrometers, Speetropho- y ADT ovhey sy aca piecdiceeeens 142 vee Stet eee e cesses B 19 tometers and Accessories 492 to 506 ‘ ID RUNES cep eieieoiee tee rCnee 481 s UIMES.....-- 2.22.2 eee 364 Spectroscope, Direct Vision, “Testing Microscope..... 294 eo LABS ocosgdspocnp anno: 419 for use with Polariscopes.. 429 Sealing Tubing, of Glass....... 258 x Rod weet eee eee 489 Spectrum IBUMersie acess eee 502 Wisp te cee he 553 fs Spectrum Tubes......... 505 Celle che oceans 504 Seck MMI os obosobosmoaDeoues 164 > Test shubesteeeeree cere 520 < hampaaeneee eee 502 Section Eee SA eet acer aa # ae tees ese eee eS ss BhOvOpEED Ey 2 Measur- PSs ete eh eee .. ~UDINE...------ +. 2s sees by in icroscope...... 293 “ _Razors................ 347 Silk Peptone.................. LTS age Tubes... ne 505 Beotioning /pparatus for Min- eo Silver pes iets crete eeee eo Speed Counter, for Electrol- Gul, Wai bihyan ageeHesseeseed 2 tees SI SHee aa aS oboe San uo 199 Sector Photometer............ 498 Simplex Ore C rusher... 163 oe ye aicaton for Centri- Sedgewick-Rafter Funnel...... 552 Skidmore Crucible...... 160 PUG OS eis. rat reese 115 Rement Glasses tte hiss. 2: ou Site entre 6 : a0 “Reducing Gear for Mo- WOKEIS hose oetceea a sueeass 84 § Te. .... 004 GOLS i oiee sepa cieceyans Soon 363 Seger Draft Gauge............ 290 Micro. : 334 Spencer Filter Apparatus...... 160 «Pyrometer Cones... .... 458 Slide Boxes for Micro Slides... 335 “ Pipettes eee 413 Selenium Cellsie: = aesseenn.. 481 x Box for Tar Testing 18 Sphygmocardiograph, Jeauet; 406 Separatory Rinnnel serene: 230 3 Cabinets. . tenes eee Sphygmograph, Lehmann. . 407 Funnel for Creosote 19 oe B Se a tees 228 Sphygmotonograph, Uskoff . 408 or 4 oan 18 a bels. . 335 Spiral Hot Water Heater for Serological Apparatus......21 to 45 i Rules......... 489 Refractometers. . 469 s ime titesiscvicres:s ss: Al Spee Rule, Richmond . tae 350 Spinthariscope.......... 460 . SHAN, Sobogeeaus 516 Slide Wire Bridges... BST . 393 Spirometer, Jaquet. 404 F: Test poe oe, Ore ou Suding Objective Changers, a pponees Peer ; 506 “ Tube Supports 52 MEISS. ee eee eee 2 SPOOLS SAL eee ae 506 Water Bath........ 36 Sling Psychrometer............ 274 ee Deflagration . . 174 Serum Coagulators, Hearson..32, 34 Slit Type Ultra-Microsc ope: Ss Sodium....... 490 “Drying Apparatus...... 193 ZCISS apne vialensyn te re LIER: -. 2. 329) Springs, Watch... vee eh aw cia JOLT Sets of Dissecting Instruments 184 Smalley Extraction Tube. . 205 Spring Back for Microtome Set of Pure Resistances for Elec- Smith Ductility Machine...... 16 LGithasts o aoe Ucooa ome Cloke: trolytic Work, Leeds & North- “Fermentation Tube. . 209 “" Manometer............ 400 MUD jeg .ieteieeragcroesasseuese wterae ts & 393 Soap; Palm Oil. 5....-.. . 348 Sputum Bottlesy. .sccmectua cen 506 Sewage Test Cylinder.......... om asocmum) Pressess sees sseeeeeee 438 ss IDISHER Mr ccycee mires oc 506 Shaking Apparatus....... 482 to 485 sf DOOD eee ee eet 490 ss Shakers) eee: acess 482 4 ce for Sieves.. 487 Soil Analysis Flasks........ 218 “ Mbit Nigess we Nee oto bS.c 506 ff Device for Ostwald SSB alan cen iwanike ts Ghee oe 61 Squibb Automatic Burette..... 87 SRhenmostatses asso 392 ce A BOLEL. . <-25- 2: see 284 INGS). 2. ose nae eee 475 3 Tables: .:;45..n50s88deee 514 Swan Blood Lancet............ 267 Swift B) Mall. -2e- ees. eee 165 Swimming (Cups---- ss. 515 Switches for Projection Ap- paratus’. .% .). .ncem a taceneeite 448 Switch Board for Demonstra- tion of Ohm?s! Laws. eseeeeee 195 Switch Boards for Experimen- tal and Quantitative Electro- lytic Anal ysis=:--e.cseee 195 to 198 Sy ‘Extr action Apparatus. . 206 Flask wvjoceepeee - 205 “ Fumeless Digestion Appa- Tatus.. 26sec eee 366 Syphons:. ......52.....0.ec eee 515 Syracuse Water Glasses........ 547 Sy rin 2es).vahesc ee ee 516 to 519 Syringe Needles............:.. 518 sé Pipette, Woithe....... 414 Ww T Dubes:.-/\ 605...) eee 541 Table, for Animal Operations.. 12 OG “Embedding -s-saer 348 ee “ Glass-Blowers....... 259 se “Projections Appa- Tatus'. 1:2. skeen 22s eeeeeeee 200 Voltmeters and Millivoltmeters 200 Volumenometer, Erdmenger- Mann. 32.5. .404- 422 “ Platinid, for Inoculating WNeedlestiviaaen sme c oe: 364 < MeN aU sence emcice eae 420 Wo Retired aden nesmeanace 539 Wislicenus Atom Configuration Models..... Re mn eee 19 Witt Filtering Apparatus....... 209 “Laboratory Press.......... 438 Woithe Syringe Pipette......... 414 “Test Tube Supports..... 524 Wolf Object Holder. ......:.... 289 Wolff Resistance Box............ 394 Wolffhuegel Counting Appara- GUS Se ecies en Seuss ae 155 Wollny Thermometer........... 466 Wolpert Air Tester. 7 WioOl Glass asic. cee eee 261 579 Page Workshop Microscope, Tassin. an Wioulff BottlesSeea.dase seca Wratten & Wainwright Light Filters for Micro-Photography 342 Wratten & Wainwright Photo- praphiciblatess--e-essseeeeer 506 Wratten & Wainw right Ray Filters for Bor ctrvacopy: slays 503 Wright Blood Capsules. . 267 S- Pipettes... oi. - 267 Wiriting Dramonderer eee eee 176 < TMamboursy-ceese sees 401 Wiilfing Axial-angle Apparatus 353 « Mineral Sectioning Ap- PAT AGUBIS as cctere ste satesrts 352 Wurster Hygrometer........... 274 Y WAMUDeS ier chreememataon cece 541 Yarn Tester, Schopper.......... 526 Yellow Belgian Hones.......... 348 Yocum Extraction Apparatus... 206 Z Zabriskie Clamp for Minot Pre- cision Microtome............ 344 Zappert Haemacytometer 262 to 264 Zeiss Adjustable Oculars....... 264 Anastigmatic Magnifiers.. 288 “Autocollimation Spectro- SCODG2 eerie rine rane 500 “Binocular Microscope..... 325 “Comparison Spectroscope 501 “Crystallographic Micro- SCODG eee eee eee ee 330 “Grating Spectroscope..... 499 “ Haemacytometers........ 262 ss" Interferometers:..-.-..-.. 471 «Measuring Microscope.... 295 ““ Micro-Photographic Ap- jPAUNIGIsG paoacascacesoctic 340 “Microscopes and Accesso- MGS ps claperspon state ter cta See ote eee 318 “ Micro Arc Lamp.. Sasite 331 “ Refractometers........... 465 “ Spectrograph...... 500 “ Ultra-Microscopes. ... 329 “ Ultra-Violet Micro-Photo- graphic Outfit. ........ . 341 Zinc Tube, Vanier. . 193 Zittel and Haushofer Paleonto- logical Charts........ 132 Zittel-Pompeckj-Salfeld Pale- ontological Charts. . 133 Zoological Charts, Leuckart- Chunky ese eee eck 134 Zuntz Ky mographs eee 399 The Waverly Press WILLIAMS & WILKINS COMPANY BALTIMORE, U.8. 4. REAGENTS FOR ANALYSIS, BACTERIOLOGY, MICROSCOPY ETC: BAKER ANALYZED MERCK BLUE LABEL KAHLBAUM CERTIFIED FOR ANALYSIS PART II—REAGENTS COPYRIGHT, 1914 BY ARTHUR H. THOMAS COMPANY EDITION SEPTEMBER 1914 ARTHUR H. THOMAS COMPANY WEST WASHINGTON SQUARE (230-2-4 SOUTH 7th ST.) PHILADELPHIA WSS 7Ae Our experience has shown us that no chemist wishes to confine his purchases of high grade reagents for analytical purposes to those produced by any one manufacturer. The advantage of placing orders with a dealer offering the three most reliable lines of analyzed and tested reagents is, therefore, obvious in that the products of various manufacturers can be purchased at one time, on one order and received in one shipment. Where competitive bids on high grade reagents are required the customer will please specify the maker whose goods are preferred, using such maker’s nomenclature as to purity, size of package, etc. It is impossible to make intelligent competitive bids upon specifications such as ‘‘Kahlbaum, Merck or Baker’’ ‘‘all chemicals to be c.p.’’ ‘tall chemicals to be of highest grade’ ‘“‘Kahlbaum c.p.”’ ‘‘Merck c.p.’”’ as no two bidders will quote on the products of the same maker for each of the items in the list and also because both Merck and Kahlbaum omit entirely the use of the designation c.p.° We believe that the responsibility as to the choice of maker belongs to the buyer rather than to the dealer and that such responsibility should be assumed by the buyer when preparing lists for competitive bids. This does not apply, however, in quoting upon goods of ordinary grade carried in stock in bulk and packed in quantities as desired. 12 og) Somat rcgeag Caras LU Klara) 9 H. ies Oo} he AS CEOs IP PAL Ne oY PREFACE In this price list we offer in original factory packages three leading makes of tested reagents. i. e., BAKER ANALYZED, MERCK BLUE LABEL and KAHLBAUM’S CERTIFIED FOR ANALYSIS, and, in addition, less expensive chemicals carefully selected to meet less exacting requirements. These are secured from reliable factories in both Europe and America, and in most cases, are distinctly superior to the ordinary so-called “commercial’’ grade. The chemicals herein listed are those which have been most frequently ordered from our stock in the past fourteen years as shown by carefully kept records during this period. We have not attempted to include all the chemicals which may be required in modern laboratory work, particularly in the line of organic preparations which our experience has shown to be demanded mostly by buyers entitled to duty free importation for edu- cational use, and which we furnish in most cases by direct importation from Europe upon orders made out from manufacturer’s price list. Chemicals not in stock are secured promptly and economically from specified or best available makers. Stains and reagents required in Bacteriology, Microscopy and other of the Biological Sciences have been given special attention and our list is offered as being unusually complete in this direction. DUTY FREE IMPORTATION. Buyers entitled by law to duty free importation are encouraged to secure from us the original catalogues of the European makers such as Kahlbaum, Marquart, Schuchardt, DeHaen, etc. Duty free quotations on products of the European factory of E. Merck must be made specially as this firm does not permit the distribution of their German catalogue in the United States. Our facilities for prompt and economical duty free importations are the result of years of effort and insure the buyer lower cost and less trouble than when orders are placed directly with the European manufac- turers. Parallel, competitive bids for duty free importation cannot be accurately made unless the buyer specifies the exact grade of chemical desired in terms of the maker’s price list. CONTAINERS. Containers are charged for extra at price indicated in marginal column except where desig- nation ‘‘inel.’’ is given, in which case the container cost is included in the cost of the chemical. Our designations for containers in the marginal column are as follows :— cb. Cork stoppered bottle. en. Tin can. gb. Glass stoppered bottle. bx. Box. rb. Rubber stoppered bottle. jg. Jug. ec. Cylindrical carton. We emphasize the convenience of our cylindrical, paraffined card-board cartons in which many of our ordinary chemicals are furnished. They are much superior to the paper bag in common use and pro- vide a suitable container until contents are used. We allow credit, if returned to us charges paid in clean condition, for five pint and one pound acid bottles and carboys, when original purchase has been made from us and containers bear our label. Other glass stoppered bottles, and cork stoppered bottles are not returnable for credit. Arrangements are made with those regularly buying Baker’s acids and ammonia of us for the direct shipment of containers to the factory at Phillipsburg, N. J. SHIPMENT RESTRICTIONS. Under United States laws and regulations established by the Inte:state Commerce Commission, certain chemicals are prohibited from express shipment and must in all cases be shipped by freight. These are indicated by an asterisk thus (*). Chemicals designated thus (°) are accepted by express companies under definite restrictions as to quantity, size of package, method of packing, ete. As all of these restrictions are without our control we accept all orders and make all contracts subject to them and charge extra for all extra packing expenses as required by the above mentioned regulations. TERMS AND PRICES. All prices are subject to change without notice. With the exception of Baker’s Ana- lyzed Chemicals on which we extend special net prices considerably less than the printed list, the prices in this catalogue may be generally takenasnet. It has been found impracticable to quote a uniform discount rate because of price fluctuations. Special prices will be extended on large quan- tities of single items or on large general lists. We are not manufacturers of chemicals but are dealers and importers. Our function is to afford scientists an economical and convenient source of supply for the chemicals they most frequently require, no matter where or by whom they are manufactured, and, in the case of the purest grades of chemicals to deliver in the manufac- turer’s original packages so that full responsibility as to quality rests definitely upon the manufacturer, where it belongs. Chemicals are freely added to our price list and carried in stock when demand develops or our atten- tion is called to future need. iii BAKER, MERCK AND KAHLBAUM ANALYZED, STANDARDIZED AND CERTIFIED REAGENTS FOR ANALYSIS um Permanganate, ¢, KMn0, ANALYSIS R001 Stewie Peaee — Suiote RSs LOT No. 6178, SR y BS ANDOEALEDS ; sh BERMOLS Apparitiis and Chemes IR H. THOMAS COMPANY, “ADELPHIA ~) MMroaTeRs amo Deaiens ~ RR wre ORY APPARATUS AND CHEMIC PHILADELPHIA BAKER BOTTLE MERCK BOTTLE KAHLBAUM BOTTLE BAKER ANALYZED CHEMICALS—In making the analysis samples are taken 50 or 100 lbs. of material and tests are made for all probable impurities. Each lot is numbered and every package filled from the lot bears the lot number so that the contents of any package can be identified and traced back through the entire process of manufacture. When impurities are found and can be determined quantitatively the amount is stated in percentages. The minus sign (—) means that the amount of impurity is less than is indicated by the figures, the term ‘‘None’”’ that no appreciable amount of the impurity tested for has been found in the sample. The term ‘‘Trace’’ indicates the presence of a minute amount of impurity only detectable by qualitative methods. The analyses given throughout the catalogue are intended as typical and goods furnished are not guaranteed to be exactly in accordance with these analyses. MERCK BLUE LABEL REAGENTS—These reagents are standardized as well as analyzed as each reagent must conform to the standard of purity given in Krauch’s “Chemical Reagents, Their Purity and Tests” before packing under the Blue Label. The standard of purity given on the printed label and under each item throughout this catalogue is, therefore, absolutely guaranteed. A reagent under Merck’s Blue Label is, therefore, standard at all times so long as it is delivered in the original package. The distinctive Blue Label is used on these tested and standardized reagents in contradistinction to the White Label as used on Merck photographic, medical and technical chemicals. To avoid con- fusion and mistakes customers will kindly use the term ‘“‘Merck Blue Label” or ‘‘M.B.L.”’ in ordering these goods. KAHLBAUM CERTIFIED FOR ANALYSIS REAGENTS—These reagents are high in price but embody a degree of purity offered by no other maker as will be seen by comparison of the analyses printed under each substance. The method of analys's, i.e. amount of impurity present in a definite weighable quantity, has commended itself to those interested in using reagents of highest possible purity. These reagents are listed in the Kahlbaum German price-list as ‘‘zur Analyze, mit Garantieschein’’ and are more expensive than those listed under the designation “‘zur Analyse.’’? A quantity of 10 grams is used for each analysis and the statements on the labels are based on the following explanation :— Spur (trace) = less than yy miligram Kaum Spur (slight trace) = “ “ u vee, EON in 10 grams of material Hauch (faint trace) = rb The bottles are all sealed with lead in the Kahlbaum factory and in addition to the statement on each label a printed guarantee is furnished with each package. There may be a slight variation in the amount of impurity shown by the analysis on packages sent out from different lots but this variat on is always exceedingly slight. We keep on hand for free distribution a supply of Kahlbaum’s latest price list for the use of customers placing import orders, particularly those for Educational Institutions, which may be imported free of duty. A R T H U R H. ay H @) M A Ss (e; O M } A N Y SECTION I CHEMICALS Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. per |b. cont. size pkg. per pkg. cont. ACETAMIDE..... OP ATED OOROCOS COT GNAREES ME BOCUASUAR Sac Orr: 40 ebe-0655.00) ‘gbi-12" oe -aeaee soa se PACE MONE eCONICAl ae meet tinc ac sacs. 2k 5atckeassanegsacl ve dbascees's 30 cb .09 1 gal. 1.50 en .25 °ACETONE, ec. p.. spac sand BakenAmalyazedsve!:.... 2... -70 cb .08 Yylb. .20 incl Sp. gr... bc 790) Be P. an +s 55.5°-57.5° | Typical Nonyolatile matter. ne .902% ( Analysis ANd On YG sc. faa mnintacte «enter none DA @E TOWN Bist tits cin Maya ded tee eels «cs Merck Blue Label .......... 70 ~~ inel WY%lb. .25 inel ested force. cieccss- solubility in water Residue on evaporation, less than 0.0025% Aloeydbs cl Guaranteed Substances Analysis ome °ACETYL Chloride, ChiDe sees. aes Rae oe Baker Analyzed 50 ThA) lees eee tote te hea Wetlelae E sACID, FICCI MCOHTIM SIS pi is ee aa cheese ctles ds & cafe aiat epasalolopy Maria ae wrSibe = 10 cb .09 5 lb. .45 eb .20 Acetic, pure, 30% Sree aes eters esis Baker Analyzed _.............. -ll gb .15 5 lb. .50 gb .25 oye Acetic, pure, 50%.. Meena Daker Analyzed gy oy vacant 15 gb .15 5lb. .70 gb .25 cele Acetic, pure, 80%.. Pate aes pibaker Anal yzedieny., -\ceetce os 18 gb .15 5 1b. <85 gb .25 ° « Acetic, pure, 99. 02905 ney es Baker Analyzed _.............. -20 gb .15 5lb. -95 gb :25 Shes GCC rCaDeB0Uget csc t eee ee baker Analyzed» eal i>. oes, 20 gb .15 5 lb. .95 gb .25 ate ACElCnGap ss) HUY tes. eaeee ee ae, BbakersAnalyzed | 4: 4.02352: -20 gb .15 Silb:19.95 gb 225 Se Acetic, c. p., 80%.. miedo...) baker: Analyzed be ee eke 25 gb .15 5 lb. 1.20 gb .25 met anes c. p., 99. 0-99. 5% Be ara NSE = Baker Analyzed — << .52 7 4 aa (= eo] ae Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb. cont. size pkg. per pkg. cont. AC ‘ID, Arsenious, powdered............... Kah] baumie Caf vate seers tere eee ooteet ae 100 grm. .50 ~~ inel F Arsenious, powdered. ............. Kahl baum: ©. A eae erm et eee tere 500 grm. .85 incl Nonvolatile matter......... trace in 10 i Arnie Sulphide o-- guazey gam { Sec ACID, Benzoic (from Toluene)... es ee 8 Os EE Beet te ot ol -43\ ce. 050% eee eee ss Benzoic (from Toluene)............ Baker Analyzed 00) ane)’ -55ceb) 12 WYlb. .15 ine! e Lingion cb by ogee eS BeRnaAneRGeee BAROCRADSoOnacco IOs “ucvacboads 15 ce. .05) 3S IBS OLIG SPO W COLE er aihic loinc, vscicsecess ars cco! meses cto ho Papen eee etn 6 et eIE TAS = SIL CIS ME Coa arose “neotenast. w Boric, c. p., crystals... ............ Baker Analyzed 10 incl .25 cb .09 VYlbs «159 amel us oy c. 22 powder. pO Peeps ef Pe Baker Analyzed -10 incl .30 cb .09 WYlb. .15 inel .0002 E 40, to a none| Na (fame test). te trace \ Typical ‘ idteas Soo taT nab Oper e acceemocreat none, Analysis Cheeses ; — 001% Dg ae eee lator eras neat dae Vole tale ‘eleva isjereiere: none AGID sBoricacs patusedvanhyd «powds oe see enee ae ee 1.50ucb 08 2.0.2233 (eee xe Roric: fusedscoe a Kahibaum “C:fA® 3.0.00... . Meese 50grm. .70 inel ¢ Bee: FUSE Ree eer se ee ceeee Kahl bane ste At ae Seas 200 grm. 1.80 _inel eo eg aL See hopse: Pee sa ae in 10 ertified Fart, ic oe este ee | Analysis Hygroscopic moisture. remainder ACID; Boric Anhydride!?. 2:25. .-....-.: Merck Blue Label .25 inel .......... 1% |b. 1.35 incl Silica, Alkalies, ete..........- less than 0.01% Gs Butyricace tps lou gaia a tee Gere oan eee eee Cem steracs -15 incl 1.50 cb .08 Ylb. .50 inel Pres Carbolics pure: whitveserystals. 2s. 0 2 ctroneee eee iets «cies -25.cb)..09. .... 22.5 eee ao Garbolics.c=sp.. Woose: crystals).0..2. soenicresteeieciase en lites ele siai 50. gb .15 2...5..- eee rap Carbolic, c. p., loose eal BakerAmalyzed) :...222.-- 60 cb .09° 22... 22) eee 1%, Nonvolatile matter 0 2) MiuPe seer . 38°-39°C | Typical 182°C Analysis ies in 15 parts of water i ZA CID; Carbolics;by synthesis usedes- 45. 2-c- sane eeeiee ne nnner ce tasela: 80 gb .15 lb. .30 incl ean Carbolic, crude, *100. As recom- mended by Drs. Mall and Keiller for the preserva- tion of cadavers. In bbls. of o0'ealssation¢: perival., AEH Co. e100 sone cee noe tae bbl. 32.50 _inel AGED! (Garminte ss yo cere ee eee oes eee a stein eee 5.50"cb) <045 © eee 15 gers. .40 incl = ‘sf Garminic2-e. cctools: Merck Blne diabolo ttaccecact merce 15 grs. .70 inel : us Carminitpiecc aoe ek on ee Merck Blue'Label <2. 223 eee aeseasceee 4% oz. 2.00 incl Tested for.......-. solubility and sensitiveness ub Chromichicoml siren rises sis ee ee eta Rees ee eee 35 gb. 15s osccen et eee es COU CS FONG iL, Ue Re RONG OAT IRE IARRate! Seaacrnivssc 50 gb. .15, 2.2 28.5 Ke Chromic, ‘c c. a Baker Analyzed -20. incl 1.50 gb .15 Y%lb. .55 inel SOs255:-5-- HNO K.. . Typical Na Analysis S20 ACID, Chromic, free from H;80,........... Merck Blue Label .25 inel ......---. 16 1b. 1.00 inel Sulphuric Acid.......less than 0.005% as SOs Guaranteed Potassium Sulphate and Chromate. . ea 5 not more than 1% a : = ACID, Chromic, for Carbon Fe non! Merck Blue Label .......... 1.25 incl - Y%lb. .40 inel ested forse semis sees ics osisicin ce seicie'si Carbon KG Ginnamicy espe fo pected teen Bhs een ihe eae 35 INCL ecoxeriana kee OO wiry bee ee s Citric erystalssor powder a -aa.0 cso oc coe soe ee ae Ie 75.00) (05) 2. ohh ee a Gririchemp i cnystalssees esses oe Baker Analyzed 15 incl 1.00 cb .08 lb. .40 ~~ inel < Citriesenip.) pOwdsse: see cee Baker Analyzed 15 inel 1.10 eb .08 Y%lb. .40 incl Nonv olatile matter Reape Gm ASSO Ree 0.003% . Typical Analysis ACID, Citrie Sebo poptdnacchoeusengecones Merck Blue Label ........ eps incl Yylb. .40 inel Se -less than 2.8% si nie aes than 1% : than 0.05! Saccharose Sulphate (Acid eee less than 0.002% as SOs Guaranteed HEL ae ais APRA os less than 0.001% ( Analysis Calcium . son . less than 0. 01% Nonvolatile matter...........less than 0.05% ACID; Dichloraceticacr mee cee eae a SOL sty AE 1:40 gb .07 2... 7. Agasee eee S Formic, purey80./o.4-<0- 2-2-2 so-so ee nina eisai ere 15. eb 15 - 24k eee ine Formic;,.05.D:<2 Se Soc oes Se ape 22 inel 1.25 gb .15 4% lb. .40 inel ACID, Gallic, USS PFs eee eure ee RTA oh ee 10 incl .70 cb .10 A Reicks UL SR Hi. TA SHE OG Mi ZAy cs Gry O; MM APP eA SN: -¥. Ounce and pound prices Price in other size packages Maker or Brand ~« peroz. cont. per lb. ant Ane pkg. per pkg. cont, ACID RGAllion sees Nitric; pure; sp:/2r-160) red fuming ee ey eee ee 40 gb 15 nonce eee eee boa OL Nitric, c. p., sp. gr. 1.60, redfuming Baker Analyzed 50 gb. .15. .. 52233 See HE ANTI, Fioh fae UGE} ego oaoeeon sce Merck Blue Label 40 inel 7 1b. 2.10 — incl The same impurities as sp. gr. 1.40 ss INIT EES fps ane WEN ns Goboondeo Merck Blue Label .......... 40 “inel 7 1b. 2.10 ined AC ge Ree len He UF OR Pie alive CH ORR Mit ACA IS Ce OuM Ounce and pound prices P Atop Nee Ye Price in other size packages Maker or Brand peroz. cont. perlb. cont. SAGIDTNitricsispygt. LesOh.. sean. antec. 2s Merck’Blue Label) ...........5. 40 ——siinel The same impurities as sp. gr. 1.40 PAGED ONitnicasps pr l-40) notes. cress Merck Blue Label .......... 40 sinel Nonvolatile matter........ less than 0.00047% Sulphuric Acid..... less than 0.00005% as SOs Hydrogen halogen acids less than 0.000015% as Cl \ Guaranteed ee NB GALS. efesats is iaystnen oes elauiciors ..none / Analysis PhS een ee eg ae less than 0.0002% as Ca naaie Acid and Iodine less than 0. 0005% as I PATHOMIO AE iciceiets,- detent less than 0. 0900075%, *ACID, Nitric, fuming, sp. gr. 1.486-1.500.. Merck Blue Label .......... 50 incl ig, Sp. g The same impurities as sp. gr. 1.40 j ; a Nitric;crudes sper: 1.38. ..25.-2- Merck Blue Label ......... -, A0 eran Nonvolatile residue......... less than 0.007% aE HED OlGLE SDULCTE eee cee SS 4,. cece Svcs BR A sees 30 cb = .09 ie OSTA. 5 se isiginc. ise Ses Ae Nae ea to ot re hoes RE SRR ante AOR a (OSTA 5: SSE) RE Rad cee SRR Lape eee Ren Ge a Cs ROMY pee cits Ate 1) S ff Oxalicecoml: gchystals.. ono ace atte Gscinceeuis weotae nes wees -l6ce .05 PME LOXALICOUTCS 6-c,0c cs ges a cece oes Baker Analyzed coe a aah 20 cb .09 se COSGe Gr ns See a eee eee Baker Analyzed! 2.225. .933 ~ 45cb .08 Seusplatile matter. conor | HOP Mp shoneacnades —0.0001% Grom Se tieaa ee oonipais Weel ROM ares SARE ccs scinace ares 0.002% Analysis Eten eeee ene See Satan ceaee none ACID, Oxalic, c. p., (carefully dried for p.. (carefully Si! 2 lpeitta Oe standardizing) Baker Special _.15 inel .75 cb .09 “ Sate cages Sree SEE Merck Blue Label .......... 70 inel less than 0.017% “Tess than 0.004% as a) . less than 0.0004% as Cl | Guaranteed Be ee hates canara none > Analysis yr G | less than 0.002% as a) Nitric Acid......... less than 0.007% as N2O0s POPE ROX AL CR oe eo Fic 5 oy ete se Kahl baum! Gi fea een a ee eee ta aes SOX ANCH 5. sae ee ees ag aaie rat Kahibatrmnc © feAn) 2 Saseacee seas onan s Nonvolatile matter s Whiorine<.=.c12.. 0 { eae hae in 10 \ Certified Ammonium salts fi Analysis Heavy metals........ Ba prams aiitsnitnee fare os oe fe ae SAMEDyy Perchloric!..2 0 >.<» 22. oss tench Merck Blue Label .35 incl .......... Reworsnie: ea seer less than 0.005% ulphurie Acid....... less than 0.005% as SOs Hydrochloric Acid... less than 0.0005% ® as Cl» Guarantee! Barium ee aes ge ae a less than 0.0025% <\ AEE Testy yA Metals tes sao Ws, cia ovis 5 ale staaianie's'e'e none ACID, Phosphomolybdic, c. TOO SESON eer tte ene ne ae -20 inel 1.385 gb .15 “¢ Phosphomolybdic, eqetale 5 oc es Oe Sere Raina Ie wae .65 cb UES coisa see ee Phosphomolybdic...........:-..... Merck Blue Label .90 ANIC eee ers, Analysis Metaphosphoric Acid none Heavy metals none Marths, ate. ...-......- less than 0.01% as Ca Substances oxidizable by Permanganate. none PATSEMIGLT Sie cats « cise Sloe toetas less than 0.0002%/ ACID, Phosphoric, c. D., SUAS 5S RIE? EINE PES Aa ast ee 35 gb .15 * Phosphoric, ortho, sp. gr. 1.12..... Merck Blue Label .......... 45 incl The same impurities as sp. gr. 1.7 “Phosphoric, ortho, sp. gr. 1.057.... Merck Blue Label .......... 60 incl The same impurities as sp. gr. 1.7 ue NOSPHORIGS Cor ps INE Lan boris Meeate< ye \ns be otaee dae eee as incl 1.00 gb .15 “s Phosphoric, meta, stick (contains : HodiimePhosphate) es.” eda.ck scestemiomeee 15 incl .70cb .08 size pkg. per pkg. cont. 7 Ib. 2.10 incl 7 lb. 2.10 inel “1lgrm. 1.90 incl 16 grm. 1.00 _inel 5 lb. .70 incl “4b. 20° inel Ylb. .35 incl 44 |b. .25 incl 100 grm. .90 incl 500 grm. 2.50 incl 4 { |b. -60 incl 30 incl 25 incl 30 incl -20 incl 25 incl 45 incl 30 inel AeeoRe (la Sige aes Flic Ty UHM OLIMEArss G. OX IMP Ba SAR Nine Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb, cont. aire pkg. per pkg. cont, ACID, Phosphoric; metacs..--eee --5 4. oe Merck Blue Label .......... -85 ~~ incl Ylb. .380 incl Nitric Acid........ less than 0.016% as N2Os” Sulphates............ less than 0.088% as SOz Hydrogen halogen acids less than 0.0005% as Cl \ Guaranteed SoS CoUROMCOae: none / Analysis ss than 0.02% as Ca less than 0.0015% wee e een ee ween cenn none *ACID, Pheasione ANH YONI MG Ys 78 oo hon ot toes ¥ Cstorernerotsactentecletewir 25 incl 1.25 gb .15 \Ylb. 45 — incl xe Phosphoric Anhydride............. Merck Blue Label .20 incl .......... 4% lb. .80 incl Arsenious Acid...../.-..-..++: less than 0.01% ss Phosphotungstics 1.07, SOluviony a2) 1h ore cies eae 1.00:cb» .08)! <.0.04 a eee “ Phosphotungstic, crystals. .... Fea Ta RR a ee Raa toe 335 gb. 07). 22). ee eee sf Phosphotungstic eee eee ee Merck Blue Label .45 incl Sere eee: Y |b. 1.85 ~—inel Nitrates............less than 0.0032% as N2Os | Guaranteed Ammonium salts. . .less than 0.0045% % as NH3)J Analysis ACID, Phthalic, c. p., anhydrous......... Baker Analyzed 25 2.50 cb .12 Y Ibias ~ “ainel Y Bicricsic-ap: crystals. Dry Picrie Acid is classed as a high ex- plosive and can only be shipped subject to the regu- lations governing the trans- portation of goods of this class. If 20% water is added Picric Acid. can be shipped r withiobhemehemicalsss2. 7 6 hes ue saeten roan. cee 20 incl 1.25 cb .08 VY |b. .35 incl ACID >Pyrogallic,resublimed e. «..os0n2ae 5. eee ee 17“ inel 1.75 _inel lb. 50 inel sf Pyrogallicier nessa sco: Merck Blue Label — .35 NC]. .iecode wae. | state eee Inorganic matte: >| Guaranteed GallictAcid Soo syatiee ewoscenn less than 1%) Analysis AGID JE yroligneouss technical’ .c aeececriny eee men eens gstins a) Acre Reece «10 cb, :09 °o. 3 2) cee eee fs ROSOIC Seer ater ree Tea irs eee ence eee eh tee een arse 25 ING] -<.cvedeaen. oot he F cs ROSOVICN creep reenter ate hielo eenseesees Merck Blue Label .40 incl, oo... eases) | syels sete eer Wested for aaa eee sense Sensitiveness i Salicyliempuretosasc.ccteesis cians sea smiles oie siejeees, Dewles eet ae 40 ch .09 icons: eee eee ra Salicylic, from Wintergreen Oil.... .................. 22 ¢ inel’3.00icb (09... 2:/ -eeeneeeeeeees a Silicic; (comlSspowderscr cn jocaesckc Seeker 2 oes Re eee Meee “2 ce’. .04 Ske eee s SilicteMjcspscanactsss wecteea ce cls sarees Baker Analyzed 10 ~=incl .80cb .12 4% lb. .30 inel s Silicotungstiches eee. cee Merck Blue Label 1.50 UNE] cece sc cee eT epee ee Jie) ates: Bo Guaranteed Ay : . s Heaney other heavy metals ...... sone Analysis Residue on ignition................... 85-99% ACIDS Stearics Uni Ste sDOW GER oa. cacscit Scprwinclescncteonte leery 35.cb .10 \... 2 noe ee eee G Succinic, c. p...... 5 Ss ieee “Stn re RAR EME Sore 60 INC] vos ee cock wep, Bets ce Ui Succinic.. See RRS pee Merck Blue Label .80 incl ..:....... Yoz. .25 inel Nonvolatile matter. eee ae less than 0.05% oe see eepuee sp ones ie oa 0. 1%) artaric ACid............. ess than 2 Guaranteed Sulphates....... copa t han 0.001% SOs Chipides ee “Jess than’ 0.003% as C1( Analysis Ammonium salts...less than 0.0035% as NHs Heavyametalsteecesccbrecc acme secon none ACIDS Sulphanilicsenystalsseac. ae ceccee eee cet ee eneeee 20. incl 1.50 cb .09 Yb. .55 incl G3 Sulphantlicyeeeracc cn ccs se Merck Blue Label — .25 imc] wos cece eee era one Sulnburie Fenaee Routes ferstcieis less than Eee ulphuric Aci ni- G teed Seep gle ete 80 Sa ns Hydrochloride). .less than 0.002% as Cl SACI DS Sulphnriescoml=,129pl by bottlesst-an ease aes see one ee .06 9lb. 54 gb .25 eae Sulphuric, coml., in case of 10 glass BLODPeLed DOLbIESL Me ccs ws aril e ne at-eoe eteceete ASE 0314 90 lb. 3.15 3.30 sy Sulphuric; comlesin«carboyans-cce eae eee ein) te eee 0214 187 lb. 4.68 2.00 ig Sulphuric, c. p., sp. gr. 1.835-1.84.. Baker Analyzed ......... 14gb: 15 2. eee aS ge Sulphuric, c. p., in 9 lb. bottle.... Baker Analyzed .......... -09 9lb. .81 gb .25 Boss Sulphuric, c. p., in case of 10 glass stoppered bottles....... Baker Analyzed .......:.... 08 90 lb. 7.20 3.30 bac Sulphuric, c.p., in carboy.......... Baker Analyzed §.......... 07 187 lb. 13.09 2.00 1.835-1.84. 95 .6-96.4% none none -0002% trace none Typical eee Analysis 6 GRRE ees SEI ER ele Dll GO) oN lee be N S) Gr sOre M Brees Ntey Ounce and pound BiIBES) Price in other size packages Maker or Brand er oz. cont. per Ib, conti y NaRo ne Tale “oni °ACID, Sulphuric, sp. gr. 1.84.............. Merck Blue Label .......... 40 inel 9lb. 2.70 inel Nonvolatile matter......... less than 0.0005% Nitric Acid......... less than 0.0008% as No! 205 Selenium: "i227. .20 eles ccce less than 0.0033% Substances oxidizable by Permanganate (Nitrous and Sulphurous Aida) eA t f Hydrogen halogen eee on ; Gusnuieed acids less than 0.0003% as Cl / “Pa!ysis LAT: Ee eee Bee eS Res gon less than 0. 003%, ipee-Venvetals ang cis otk chine «cape cis none Calatimera ee ccotte eee less than 0.0055% Ammonium salts. ..less than 0.0015% as NHs Arseniogs 3.3.5 SKS oi: less than 0.0000025%’ °ACID, Sulphuric, diluted, 16%............ Merck Blue Label .......... 40 inel 9lb. 2.70 incl he same impurities as sp. gr. 1.84 : 7 a Sulphuric, diluted, 10%............ Merck Blue Label .......... 40 incl 9lb. 2.70 inel The same impurities as sp. gr. 1.84 x *ACID, Sulphuric, c. p.. ; DAKO Special Pina Micncss os 5 0 oes ued tee 9lb. 1.08 gb .25 (Free from Nitrogen Compounds) _ ~ ag Salphunic come suming, 20S Ogs ecricicc veils -ayciremewere elseeik ee 12 9 lb. 1.08 gb .25 meas Sulphuric, c. p., fuming, Gris Oa ails SoD ete ctr Ad Sone tene OD eb!) sLOMe. AUER ewe ek. bak me Pee Sulphuric} fuming: 984 4s oe. Merck Blue Label .......... 45 dncelit Analysis Babee aedgattstcictalic is less than 0.0015% as Cl BA Met aee OR Fe eS lec less than 0.003% eee BRS ORCC BOR AO HSE less than0.0001% °ACID, Sulphuric, with P.Os............... Merck Blue Label .......... 60 TERK) Oar oh he ol aa tn ee PE Nitric Acidt)s.2..... less than 0.004% as N2O5 Guaranteed Ammonium salts. ...less than 0. 002% as NHsj{ Analysis *ACID, Suiphuric, fuming, with P2Os...... Merck Blue Label. .20 ELC LWNE Meets. icles lb. .75 incl NELTORGNE ss = tse cies a ciciea less than 0.001% Cami’ Sulphuric Anhydride, tested reagent Merck Blue Label .......... ......... 1 Kilo Tins 1.25 incl Shan £6 Sulphuric Anhydride, ee reagent-..Merck Blue*Liabel) xi5ccne sacs) Reel bak 50 gm -65 incl «é a ED Ona WV AISIO ase cb nSoE Baker Analyzed, ....w.5 5... 20gb 15 5 lb. .60 gb .25 OF, > 504 Typical 2 -0003% ¢- Analysis Nonwaintle matt - .0008%, SACU SA SIIDRULOUS, (O90 <2 105 cco sicids Jamies Merck Blue Label .......... 45) Singles aes Sawin Nonvolatile matter......... less than 0.048% Lb Sulphurous, cubes, 20%, tested 3 NEVE 7 Ooo. .scans apes VOD Oo Merck Blue Label .......... -60 incl Ylb. .25 inel a CLEANS TOLD) 9 arg ere as ot Eat ee WelOvcey 0S ena) see se LETUTISIGE Job cig gag beh bioim Gree cick ERS a eae eho i ee 150 in cl ee eee ers ices ne REVIT Re 8G ants 5 SUED CHE Merck Blue Label .20 iV ys eee ie Vg lb. .80 inel Inorganic matter ..less than 0.125%" nGs. Seah acca . less than 0.008% | Guaranteed PIPRICANCMVGKLIN, oes ese cee eee ee uone( Analysis Writors 3 i. scrcereeweeta crs not more than 12% ACID, Tartaric, cryst.. RTT eee ens Ae heveeucteke oe sic ee eles SLR ara ADCO Die treat re eke Cree ane oe awartaric, powdered. . Seon toe Road EET RECOIL Ooh son carci n SAD CCTs Oi ters tere) areata ee rea to) Lartaricyc., p: crystals... .2..0.4. . Baker Analyzed 10 = incl .75cb .08 4\b. .30 incl 7 Tartaric, c. p., powder............. Baker Analyzed 10 ~ inel .80cb .08 Alb. .30 incl Nonvolatile matter.................. 038% (3,0 Beas ers SAB -. —.001% Oxalie Acid none \ Typical Cake... none( Analysis Ree 001% 1H eRe none, BRUNE LATLANIO 5.5 acne oe oe rire sehen sare Merck Blue Label .......... 90 incl Y%lb. .80 incl polpniae a less thas 0. thaa da | xalie Aci ....... less than O72 Guaranteed peace oeeeseia ame a Inorganic matter.............. less than 0.05% } CLE MUMIOACEHI Cs ccc eres es eke Merck Blue Label .30 incl .......... Ylb. .90 inel Nonvolatile matter......... less than 0.0047% | Guaranteed Sulphurie Acid ...... less than 0.003% as SOs} Analysis ACID, Titanic, c. p., anhydrous (Tita- : MAUIT ORT E) Se re ect see oF tee, nS ATA eT 380) Sinels ee ) SURISH 3. a ‘ M@richloracetic; pure; crystals..02..8. 22 0srk sodas dads. eSigb: 00200 e bw 14 i te” ee sel a BUN ea tie area nis Set rere Siw ake lace of ose ee et les SOB CHaeORN een Ee UML 2 ees Ke MN ESELC HCN peered ee Rees ies eb dawn ER A5 INCL A Se ete OLIGO) esis aie eee cs FACE OO eee nS Sete te od tie eimnerel ahelngrels ROTC DI ecUS ite neta Ohta s aia ae te ee al ceT acts ss AYELEDEE UT AUEA (S10) feces Ce ER epee Oiler ate Oar lOMen chiconcls weet nes cr FAUT YY Oe chore ee ip Re ecleterO CRE ME ORES Gn COPEL SCRMEMn: «cra ieee aay Epes lgrm. 1.50 inel ACen ole wy rl U R H 1, Bel O M A S Ce Oma MM Pew Neeeyi Ounce and pound prices Price in other size packages Maker or Brand per oz. Sait per Ib. cane size pkg. per pkg. cont, AGAR AGAR, in shreds, prime, white. This is a specially selected grade for preparation of : f culture media.............. ANH celes COvNOs40) Weise ee 85 ineli rise: Pee eee y OWT eee Aeears eee Witte 20)¢b 1032.00) cho! 1088s meres etme terete ster ALBUMEN, PNOMUIDLO OM Werte pop Aass akets Vere esa lav se bie ou ato Re ree hctcteaiees 45 Inelikece ael e ee POMLE LPS PeOLUDLE- SCALES f20 ciinale messes ete Ee 115 eb at09) oo Soe eee Ye fromieges;impalpable powder |. 0... .. ia... ete veces oe P25:eby 200% 2 ace Se SAE COHOEMWAMVLCS Ayer isc eeisissen. ce aeeisceaieete rasan ep Aree 60icb 09: oks cn eepinee eae . ANY LIC UNITE Goat iitcrcvets sires make vere vssenc ecsieiate ose areas ene aaa TS ich: 209. asies- Beers fea 5 a Armylicticuper.-sseeutiesineser.c- Baker Analyzed —....2.-2%: 1.25 cb .08 lb. .40 inel st e aah a) aa eaten cM dees 814) Typical Bees eta pteyae le vail creneroele 128°-130°C J Analysis “ALCOHOL, Agasiia: for Gerbers fat deter- mination, tested re- ; ! Agentiee san ty ck tn ce Merck Blue Label .......... 1.25. incl 4\b. 40 inel 2 es Amylicy oo wen ween Merck Blue Label .......... 1.60 incl Yb. .50 inel Nonvolatile matter.......... less than 0.005% \ Guaranteed Foreign organic matter Cee TaGe ete.)..none{ Analysis “ALCOHOL, Butylichaso yb LOG POR sc. « Srecttuure eysiantsheeaees islalersscarersre 1.15 cb: 09). :5;4.,n12 skeen m Ethylic, denatur aa Pee ORE SAGO Gh oU Go mo oomceses lpt. .15cb .09 ; 4 Bthylicsedenatured ss. sce ses Weiss, Se e/nee.e cisre ok eet eT eT te Pe 1 qt: .2cb 12 m ee th ylicstd erature rent. cisco. pestis senescent tae eRe earths 2 ne Ee ica ge Ronee gal. .40cn .18 2 a Mthylies denature dec ce asst att ecient Gets oie i oe ee ee eee lgal. .75 cen .25 i se Bthylic;; denatured se oie s:dc 0 eile, aati ctave «dines hsickoe ra ara aI eee 5 gal. 3.50 en .50 . “f Bthylics. 909g eee Senet cies Merck Blue Label .......... 1.10 incl Y4lb. .35 incl Residues: atacauneisteak bieee oasis none Fusel Oil.. ....none Molasses-Alcohol 5 =| Aldehyde........ ... none \. Guaranteed Organic impuriti ...none / Analysis Metals and Tannin............. .none Acetone: sn. --cascekniecs less than vies ( Murfural | se Seclancle less than 0.0001% SAL COHOE SBE thylic; 959% (Eran). ssk.cok oo cou bate on Resch Sekthet ATE HAREIOOR c eacteaete lpt. .50cb .09 I yy Ch yliGs7959G) (ET aIM) |e ie One -s ake ayy Sees ely Lao doce Soe oe lqt. 1.00 cb .12 y ee Mth ylies G5OG ie rain) a. oe 5) specie sete ae een aeNS ene DIR oe Pane eee ne ee 16 gal. 1.75 en .18 = Ethylic, 9. 95% (Suivi) basa Sen Rene erent stir oc Oa oon ed MORE cle socia cane c 1 gal. 3.25 en .25 e S DUANE Sha (Cae) Sab ereasin Surat ost s Rood ne obcodnboee usoscccnes 4% 8 al.15.35 en .50 S cs Ethylic, 95% (eran) Baker Analyzed et sc eeinsncs -55 cb .08 l gal. 3.25 cb .25 Sp. gr... 1 “ALCOHOL, Ethylic, 90% Gan Merck Blue Label .......... 1.35 incl lb. .45 incl FROSIGDUG Has ER arterieielaneeesiieaccsaisie none selli@ilke merece s.c .... none Molasses Alcohol........... = Aldehydes ery ck. ..none \,Guaranteed Organic impurities................none / Analysis Metals and Tannin... . a) Acetone .. Jess than 6.02% Furfural ...less than 0.001% “ALCOHOL, Ethylic, absolute, Soy EOD CaM ERLE ER Sei Tin ines RAR MC in oh es bei 1 pt. .70cb .09 . ‘ Mth ylict absolute od Soe cae ec ke eee oe Ne ee ene aes 1 qt. 1.40 cb .12 : s Ethylic, absolute, OO ES Gast cake cpr Me ey eva Ee ook oor eh cee en ee 14 gal. 2.50 cb .18 : sf HEH YIIC PADS OUIUC IOS star. oe ace ie ge soles er eee Lele craic eee eee l gal. 4.40 cb .25 s Ethylic, absolute, 99.75%..... BakernAnalyzedieveves i: sess oe 75 cb .08 1 gal. 4.50 cb .25 : s Eithylieyabsoluteys-- cogs. »..) baker Special. + =. 0222.08: 85.cb 9.08 2. awe eee Aldehyde, (H2SOx, test one-half hour) none ia *-7o1en ee2a . Meth ylics (ood i Rene intl Beto ea eso sia yee au eiataueis ss aoe Se a eae 5 gal. 3.50 en .50 = a Meth ylics 9a %Gurscn ss ieen tee Baker Analyzed .......... 25 cb .08 lgal. .95 cb .25 : 55 Methsltc, absolute... $2)... Baker Analyzed .......... 50 cb .08 1 gal. 2.75 cb ©.25 Methy WAN COHGIiiek ave snieese 99% Nonvolatile matter......... Acetone... Al Typical ne | Analysis Atami es srilen pid AW PR Hie ir ee OM NY °ALCOHOL, Methylic, 97-98.7% (Colum- bian aN eviews. 1a siete ties Se elas Methylic,'sameas:ab0ve.....o. 3. jeocsenecewnn cee “ $ “ Methylic, as specially recom- mended for use in prepa nation of Vright’s, Hastings’ and Sorowehy, 8 blood stains. . .. Merck ‘‘H. P.”’ “ALCOHOL, Methylic, Acetone free.. Kahlbaum Methylic, Acetone free.. Kahlbaum s cs MMe thy lice ee... deca ets os Merck Blue Label AEM See matter... less than 0. 002% ‘ SS less than 0.015% Bibs), AeaHeLe wes -less than 1% Empy: reumatic substances. ....... none . Guaranteed UG ERG CoE Ree Sere See none / Analysis Substances oxidizable by Per- OAT PAN AUG Ves cine alae misisameim st one Chloroform............ less than 0. "01% °ALCOHOL, Propylic, pure................ Ra ae Na ee PRE EDY DE. PULe MOOT Goat, caicis cie)s\s -sieiw cree atie ° “ (Sodium Monosulphon ate) as recommended for use in gas- GRICrANAlyRigtw es Sy ke, s Ske pRS ems. ve ALOIN, es used for ‘‘occult’’ test for blood TIE REE OSs ay ict Mas PPMP Soha) nan eles & is ciees GRPER: ALPHANAPHTHOL 5 helactot: > banmSnenneen Merck Blue Label Organic Substances insoluble in Sodium Hydroxide solution....none{ Guaranteed OrganicvAcidse. fis. 2-2 5.234 eel Analysis Inorganic matter...... less than 0.05% 2 ALPHANAPHTHYLAMINE. .....- Merck Blue Label Mested! forsss 55... Fas sels ee cee “solubility { Guaranteed Nonvolatile matter. ...less than 0.05% | Analysis UOUVIGINU Vienne tal toler ses hittin te ey). . aca gneaats = “ce Metal - RHESUS Nise TL sets teal eis es MEGANE OSS Yi soe. nes tys we eva Else oat ose ee os i NEL SOW AEE: ANE 4 cia rarc Aiea «are emsv arate l= & entre : 3 FUEL Al MPOW GEKA eye sy ae ee ee ees ee Wires UNO. OA Brienne. bo) ma nek eens beens ALUMINUM, Acetate, c. p................ Baker Analyzed & Ammonium Sulphate (Am- montium Alum)’coml:,eryst. — ©... Seuss < seen. ss Ammonium Sulphate, coml., (DONC sericea odo co UUOREEd RECECE ROE ROE EGO. << Ammonium Sulphate, c. p., GEYSUSIS es salen sete tee cyerel’= Baker Analyzed = Ammonium Sulphate, c. p., WOW Eh eesenargceie ea Baker Analyzed os eMlorite c. B SCEystals:...r Baker Analyzed Jena h yee OMG ek Boouamn 004% | Typical SOs ee ES eee 002% | Analysis ALUMINUM Chloride, c. Drsublimed =f wo tee cess ata a TOT Gh Eemldheebcla Gene hotles hen an paeenppeOooUE G lENGH EC Gy ONSS, copooncosy iebpussronecuacr oA as Hydroxide; ct: pice... 6... Baker Analyzed N ‘3 Nitrate, c. p., crystals...... Baker Analyzed si Oxalate espe sccascdece Baker Analyzed us Wxidesipure cee ae ee ee pansies ae 2 foe c. p. (ignited).. .... Baker Analyzed 05%) a peer eh 000197 \iTypical S10 PP Ue Senne 001% ( Analysis CHO a eerie tere . none ALUMINUM Oxide, for Tannin determi- nation by Wislicenus’ MEbHOGay foe ees - Merck Blue Label Metallic Mercury and Aluminum none | Guaranteed Tested for absorptive power for Tan- ( Analysis nin and colors. ALUMINUM $9Phosphate, c. p............. Baker Analyzed 3 Potassium Sulphate (Potas- sium Alum), eeiatale:. I Cee mare “ Potassium Sulphate, purified, PO Mena eneee toe See tea Sarin a aa mrp Ounce and) pound prices Price in other siza packages) PUNE WCONGENLTALE s.:scmel.. eae ws oni oe i ALIZARINE, [SE SLRS stake eh eee A Re oe ire or ee ae per pkg. cont. 75 incl 25 incl 30 incl 15 incl 15 incl RED incl 50 incl 50 incl 60 inel 25 incl 40 incl 35 inel 25 incl 50 incl AveuR a, 1 kde AU ee H 1 ele Maker or Brand FALUMINUM Potassium Sulphate, c. p., CLYStAIS sasemdsiaticrile eet Baker Analyzed «€ Potassium Sulphate, c. p., _ Baker Analyzed Typical ( Analysis ALUMINUM. Sodium Sulphate, c. p. (So- GiumlAlum Ress eisai Baker Analyzed & Sulphate ccoml S 5. 35.\scicjscs | assets & Sulphate; puresssmcscas coos - acme see ee ef Sulphate, c. p., ‘crystals. . Baker Analyzed He Martratecapccece setae Baker Analyzed ALUNDUM, RR AOOS 90 ori 20meshtecni. 5 secre ce acct RR 605 90.or 1 20imesh)acee) sce se eee “ AMMONIA, gas, in valve top steel cylin- ders, returnable for credit if IN LOOGNCONGLGON sce cote sss tiainioete sei AMMONIUM Acetate, c. p..............-. Baker Analyzed Nonvolatile matter........ -001% Typical FO eke nl anaes AMMONIUM Acetate...............-..-- Merck Blue Label Chlorides. eas than 0.005% as Cl OATS (0 Guaranteed Pea et coos Anata Barths: 0.2.0... less than 0.004% as Ca AMMONIUM Arsenate, c. p.............. Baker Analyzed Ke ATSenItes 62 1p saeco sis = eae Baker Analyzed rs Ben zZ0ate, Guess res hk 0 Sea easier as us Bicarbonate, c. p........... Baker Analyzed re BICnrOoMate nee ei sate ae enc io ere cinta cle as Bichromate, c. p...........- Baker Analyzed aS Bifinoride;c. ps. se) sae Baker Analyzed 6 Binoxalateye-ipt..2s0..-5 2) Baker Analyzed “ Bisulphate, c. p.........-..- Baker Analyzed G Hisnlphite,; c. p., cone. sole Baker Analyzed pret natc asics ns 1.32 Noe a Tatale matter ... .003% val Typical Boe ~ Boneey Analysis AMMONIUM Riaciats. < ‘ Bitartrate, c. Deter inees Baker Analyzed « Borates yO: (Dir. Gig ceareis eves te Baker Analyzed “ Bromides|¢-pss4-- see. oe: Baker Analyzed < Garhonatesplimp Sis 02. cacy ee olan see se Carbonate;\csp.. ss <2 _ Baker Analyzed AMMONIUM Carbonate Bie ae +1 ae AMMONIUM Carbonate.................. “ AMMONIUM Chloride, granular, pure.. RR, 60, 90 or 120 mesh (Spe- cially treated and free from Suriacevalkali)mss-n- see cscs RR, 60, 90 or 120 mesh (Spe- cially treated and free from surface alkali................ Nonvolatile matter. : 40 .0001% \, Typical none/ Analysis Organic matter... de mel Thiocyanate..:..:......... none/ -less than 0.01% Galanin ae teaske eece “less than 0.0125% Sulphate........ less than 0.01% as SOs Chlorides... ... less than 0.00025% as Cl Thiosulphates Guaranteed less than 0.0008% as (NH): S203 / Analysis Phosphates.....less than 0.01% as P20s Heavy TG bala” sae e CR ry ee none Sulphocyanates, less than 0.12% as SCN . .none/ GCarbonatelano2 5. o2c. os 0 Nonvolatile matter .none a in 10 Pees \ Ceat Tarry matter.. ©; IM FAS G Merck Blue Label Kahlbaum ‘‘C.f.A.”’ Kahlbaum “‘C.f.A.” Ov sMe SP Ounce and pound prices AL Nay Price in other size packages peroz. cont. perlb. cont. size pkg. aredid eiAalte 25 cb .08 Y |b. TRG RRee ot 30 cb .08 14 |b. syeieearn te ake GOlcbe08 = ee batt saccade WOicc! LOSI sheen se He 20\cb: 208 sie aie Br sm ge aes 30:cb: dennis myers 500 grm DORE GIST WZice (-0bisgh wees Erato anes 2 |b. per pkg. cont. ails incl 15 inel 60 inel 30 ~~ inel 1.00 inel 40 ined 1.50 _inel 10 Ib. 10.00 cy115.00 25 incl 30s inel 45 incl 40 inel 20 inel 30 inel 25 inel 35 inel 35 inel 90 incl 15 ined 25) | nl 50 inel 95 inel wee ee eee ss | : | Ae oR aE AMMONIUM AMMONIUM AMMONIUM AMMONIUM AMMONIUM AMMONIUM “ce “ AMMONIUM AMMONIUM AMMONIUM AMMONIUM * “ * “ * “ * “ * “ * “ *AMMONIUM ° “ lols, 18} fie PRUE TOLR ANE SCA. Cc Qunce and pound prices OM BP eA, GIN JAY. Price in other size packages Maker or Brand peroz cont. per Ib. Chloridesc) pPt.n. Bacwn... Baker Analyzed 10 ~=inel .30cb Nonvolatile matter. . cnonel BOSS ase Typical Ie dencodse 7 ( Analysis Aniline deri Chloride Merck Blue Label .......... -65 Nonvolatile matter ....less than 0.01% Phosphates....less than 0.001% as P2Os Arsenates....iess than 0. 005% as As2Os Heavy rietala eee at see oe Onn 8 none \ Guaranteed Galotunn Stier sss. less than 0.01% / Analysis Sulphates.......less than 0.005% as SOs Sulphocyanates, less than 0.12% : as SCN MariGasesieecas, scat isn skies eieatoss none @hloride tere eccceces sane Kahibaum: “Cc At vita. wats antec ante Chlorides ernet nsasscue rode Kahl baum: Cif Awe oe fy tectentts seis: Nonvolatile matter ..... none . Ruletate Weenies dinisleinee mone PE OREN Eo sacodanis in 10 \ Certified Ehoephateand Arsenic: none ) grams ( Analysis Alkaline earths. { Tarry matter... Chloride, c. p Baker, Specialeih ) ein. sco.: 40 cb Nonvolatile matter.. .001% at Typical Aniline derivatives. . ... none} Analysis ; Chromate; ce yacne +. cane Baker Analyzed _............. 1.80 cb @Whromaterin ess Aen ee Merck Blue Label .25 uncles see Pies: Refs > Sap ee Wee | orides...less than 0% as Sulphates ..less than 0. 029%, “as SOs aun anteed Aluminum........... less than 0.1% o\ aM Calcium........... less than 0.005% Chromium Sulphate, c. p... Baker Analyzed _................ 2.00 cb Citrates ch pei cscs. setierice Baker Analyzed .......... 1.50 cb Citrate Solution............ MerckBluemisbele ce ace .c a Selec ce Contains..27.93 grams Ammonia per liter. Dithiocarbonate Solution... Merck Blue Label .......... ...... Nonvolatile matter........... less than 0.005% Ammonium Carbonate ‘{ Guaranteed less than 0.0045% as (NH4)2COs ues Fluoride; CAD rcecasecitecietts Baker Analyzed 20 incl 2.00 Bee typical Nonvolatile matter... Analysis Bluoriderarsctsecee socks ns Merck Blue Label .25 LINCS eet AISNE matter less than 0. eee jor1des... AC 0 as Sulphates... Jess than 0. uk oe SOs» Guaranteed Silicofluorid ‘less than 0. 015% (NH)2SiF | Be lea viy IMetalss. oainas sates weeisine asics sieieiees none MI MOrIde 2's ac cacen! cope weenie Kahl baum Cigar sere Ronee matter..unweighable | DPLYOEERUD cresata teil stalereleiaisieiel See metal, powder. MSS cel. cd See 2 Uo Aricperttola yeaa Sahl One re 280 Gee .041 092 ee See a metal, eranulars.....:.... 5: Baker Analyzed _............. 50cb .06 lb. .20 inel Typical Analysis ANTIMONY, Kahl baum) 2 sql 5-253. ms we ceseniae 100 grm. 1.10 _inel CC Chloride, (Tri), c. p........ Baker Analyzed 15 incl 1.30 gb .15 Ylb. .40 inel Us Chloride (Penta), c. p., fum- ENE Neen Saisie shoe Baker Analyzed _.............. 1.40 gb .15 Ylb. .45 inel G Gude (Tri), C> p.- ae Baker Analyzed —_............... 1.00 cb .06 Yb. .85 inel Be. ncssetestestsss stores 0.001%. Typical SOs. bessoncnceniece = 0.001% f Analysis eolble residue...... . trace, ANTIMONY Oxide (Penta), c. p. ve iBakersAmalyzed= 2 Sn2. ose 1.00 cb .06 Y%lb. .35 incl w LEEE (Cini) eee eee Merck Blue Label .30 vi) PO oo Rdocc:s on sslc- TNOMIG ae eee ess than 5 Gunrantead Chios He ua 08% at nope Analysis ANTIMONY Oxychloride, c. p..........- Baker Analyzed _............... 1.20 cb .06 Y%lb. .40 ine) Oe Potassium Taxtrate, purified, Ten ed ede. OS = GR nSoanaekan wseucoLuacmoccgs | GnBaEdcoos 45 cc (05° 2.225...) oe “ H Baker Analyzed _.............. -75cb .07 YZ lb. (25. eanel i, Al Typical \ Analysis SB. cece cmwccswmennneeseeussonee none ANTIMONY Sulphate, Crnph tates enter cee Baker Analyzed... . 5 ss. 85 cb 08) :».<\:25 See Pees & Sulphide (Tri), c. p., red... Baker Analyzed ............ 1.50 cb .09 Yylb. .50 inel Us Sulphide (Penta), c. p., yel- ‘ Ch SPS NN EOI eArCoT eta wt ker cins natok 1.00 cb: .09: | .. oos. tee “ Wartrate Capen woe ec alate isis leer Ayaan ss V.00\cb* .08°. . ccssi-)- eee Son 14 15 ROR ar HU OR ae TOR Or oi Aer ss CHTOr Ni IPM AR EN ay Ounce and pound prices Price i in other's size packages Maker or Brand peroz. cont. per Ib. anit size he : per pkg. fant LCA ELINOR IMMER ores crns toch cctlctebis ite clos cites Beret e ME RTAGIEIa Save sitiyace etary sideldw etles 5grm. 2.25 inel ARGOLSe(hotsssium: BitantratemcCrud@)es 1... .wcicass merce ctel “sleckieteiiete LO ceyO4e at Markt. cee Gen ARSENIC, eae htt 9) Oar cab ein SAA SOE aN Ud rire MOMIHy ere G BOLE Race ene ACC Ry ODE Metering sitet aarchas Chloride (Eri), PURSE Clo M pEeessdaasuedode s ADRES Cane erc roc MEM EIASY. | ccciticertieenet s Sulphide, yellow (Orpiment)... SAE NO Lao ED eS SO thors 2iCCs cODa rece RNa) retina oo a ie! TECsaa.2: “ aii Hee sche tee cle nein eatidica tteas 2 ChasnObk aera Malka ee Trioxide (Arsenious Acid) ,lump or powdered......... Merck: Blue/Label .........: 40 incl WYylb. .20 inel Nonvolatile matter ..... less than 0.05% ay Barium Sulphate, Taleum, Calcium Guaranteed Sulphate,lete.. 22002. 2. onsen oe (f Analysis Arsenic Sulphide ..less than 0.0005% as S, AR SENG Che Drisn pide vcsipsiasacosenee al, castes ubmtciodal? iecaeescied LO0icb) 207) ahnotit) tae. ASBESTOS, WoolncleanctOrmLbenin wy. loch erate era eee ee eels arts 250i tine lisinmcy ayaa hee a Smt Italian, S]aVChy Peel O} Reyer iGN AAG Ghana STC ee OhT s ES Bee ol ear ere nIeE 2.00 INC]! wiry CLAS NTRS « re Italian, short fibre, washed in ROO. enc abcde & Geen eR SO cng GaSe ECR IIES ean mans Cetea OG 2.50 TTC A MEE AS eR ee Italian, short fibre, washed ANAM GUIS ese Pe ert ieee) MINS ve er tilelaheis afc atv palettes CONE AOCLN Sa leaetalite | tsttinieusie-sforee ¢ Special for Gooch crucibles. This is short fibre suitable for rapid filtering and con- HAINS WALT CEROLIL OMe cry te estes -niaydine are che tires 225 incl 2.50 ICM Fe ieaner hassjeiste sve: ef Italian sslonoribres seem tc seine chloe te teal cen eciciontt ce ROM MITITICH ster ten ah cee ore oe Hs Italian, long fibre, ‘washed in ENON Be rile ea lace ie td a area ia Re geSE aes aera M ei MM Bias) 1 )\3 3.50 ATCllyen EI eae ere i extra long fibre, selected ; WUC H Pee eee eer ec PRS AA TORE SOS NOE Sole bree eS 3:50), . Sinel. ca joct ey, bas eel ees < for Gooch crucibles.......... Kahlbaum nis) WAGE Seadonsyed (end cao wordcscnde : PALETTE GO Senin reeset sie tind cred siavevava, otetere erates ele ASO eer Mae ena) aR ee he eee ov cee eerie ae BA ED AEUA GUDING cite tere sah hcl nets ice axs tes Secyssatefois ay!) -ccce 2 SME ds Rote aend WOO fC 04s ois c,<. 5h SRPIOMA cite ease ENGST ELS ZN VLU toceair Tea SR ley I i gi Sr a eae Eis Tee Sey list tee 410 .cb -1034n.25 ch708 6 bee occas PUMP PAE VAMINE oy tare crc es rath eye ysis cho ceam, aves AMBRE RENE Pace! eel stoicinas FRR Retelel-: c.g = Be 5grm. .50 incl AZOLITMIN Ree eet reyaceesietsy ers eG lo} Ayia en wee ood suey pe aera 5 erm. .70 incl meeps BR Ae ee I oe Kahlbaum ee een os ie, PLO erm Leo0 pe inc) CS) herein earns Corrie area as Kahlbaum*= passin tapered hice dens sank: 25 grm. 3.00 incl JNA OUT ELAN 1 hs FR ee Merck.Blue Label .......... 4% oz. 1.75 _inel iO NAR ae ae Bambokiy tapes MerckiBluesbabell Sasceee | aece ven %oz. .50 incl Tested for...................sensitiveness BALSAM, Canada So Microscopic 1 Mounting Media, Section II). BARIUM AD Col sushshesanhe sponnewene Baker Analyzed ............ 80 cb .08 Ylb. .30 incl Poe tGane iets BAA ste ¢ he Soeacoeat trace or .. —0.003% Al - Typical CaO. 3 —0.001% Ss ” RrAl Analysis CPrch es Pe Sone i lo PPAOLUMPACELALCN frie ck bc ckueeh en Sem Merck Blue Label .20 rea el Wave earn Sept 4% |b. .70 incl Chlorides..........less than 0. 002% as Cl Calcium and alkalies. not more than 0. os%t Guaranteed ret RS Seer ninnaney aa 2G Analysis WNitrates....... ess an “/0 205. WVAEUUM Acetate. oii. 21.5505 rciers cies eressiece Kah) baum “@oieAci Meee ence 100 grm. .80 incl o COLATOME Ee re secre eee tert aie Kahlbaum: “OivanZe vee eo ae Wels oe on ore 500 grm. 2.25 incl Nonvolatile alkalies present after _precipitating Barium. ..1.95 mel; in 10 } Certified Chord: 2200100... Thome &™™5( Analysis eavy metals..............- none } PAE MUI OKALC sec ceed eis cen atersiviase Baker Analyzed ............ pL Te oj al le ae eee 5 ee id eA oe Carbonate, native, powdered (Witherite) ieee stat SARS thee. sen claaearces ts ASC Ci O4 ay rater icv vy ectcen erie es 12 10 \, Certified Strontium and Calcium Chloride( grams (7 Analysis faint trace Heavy metals. ..............- none BARIUM Chloride, c. p., puller ane Bk a SaweG DgOSpsherte Beate D0 (cb 07, Sere see shape < Chromate, c. p.. 48 Baker Analyzed — iets ott 80 cb .07 Ylb. .85 inel Dioxide (ee Peroxide). s Mluoridesrespy rete ences eee Baker Analyzed —_............. 85 ch 07 ...2 cc) 2 oe Hydroxide, ee ‘ery Fatal atone kee Sy te nL eet Me -25.cb .08 .. .L scene Moth ce Hydroxide, c. p.. crystals....... Baker Analyzed .......... 25cb .08 Amv o ns ts) incl CaO.. Fe . 70 Cl 0.0003% \ Typical CO cation dieecteene nt cane mone ( Analysis Ii adancoad. Binoseoostoonoasdoudacomr Uo none Sr.. none BARIUM Hydroxide ANGERS Cred MORIN acl eee Merck Blue Label .......... 60 incl YZ |b3~ 25 So inel Chlorides ee tes than 0.0005% as Cl) ‘alcium and alkalies | Guaranteed not more than 0. ssl » . Heavy; petals) a. cenr nena sec cee oe ne Analysis Sulphides Sa aoe less than 0.0027% = $s . BARIUM Hydroxide, c. p., anhydrous.... Baker Analyzed .......... -60 cb .06 Ylb. .22 inel oe Hydroxide, Solution, 3.38%...... Merck Blue Label .......... 50 incl nee se ches than 0.0005% as Cl} alcium and alkalies li Guaranteed y. not more than 0.667% » Heavy metals........ 220-22. 20ee sens one (SELENE Sulphides.......... less than 0.0027% as S F BARIUM Hydroxide, alkali free........... Kahl baum Cora igen 100 grm. .55 _inel sf Hydroxide, alkali free........... Kahibaum “C.f£:A.?” 3.0.72 eee oe 500 grm. 1.00 incl TAVUES 4 parade aoscteuo meas none ) Lime..... -none { | Ch.oride faint trace | in 10 ' Certified Sulphide....... -none/( gtams/ Analysis Heavy metals. . “none ( ( Content found........ 100. 5% “BARIUM Nitrate; powderis.0..esiecwiccm, Caehisiaccetrde see pete eee «15.cc.. .04, .. sonnet eee eee es NTE Cel Banoandononnonnern BakersAnalyzed ~~ ee sa-nee 30 cb .06 Ylbe iG anel Rector erase tres 0.001% Ge Fest OA: AGORA ACO OC ae oi 0.001% | 1 eae eae a een eos 0.001% + Typical NS (flame test) trace ve “BARIUM } : Merck Blue Label .......... 50 ~~ inel Yylb. .20 incl Cc hlorides......... less than 0.0005% as mat G Alkalies......-.--- not more than 0.0867%+ Guaranteed Feary, matalde--sceccasoncameciansicnts none avialysts BARTUM@Oxalatey cp sees) eae ieee Baker Analyzed sw... ..-- 90 cb .09 A Oxide, hydrated.......... Baker Analyzed =s_. 5... -60 cb .06 - s Peroxide: (Dioxide) 3... nee ns stb wc estado See IQA fiers yarsts siees -30 ce .04 § a aes En c. a Se eee Cte Baker Analyzed _............. -60 cb .06 eae ss .-. 89% 0.050% NRO Ded hast Ni eer Re 0.020% » TYPical CRON ae ie cee eae masee ns 0.001% (| Analysis SiOz... trace : *BARIUM Peroxide, tested reagent. . Merck Blue Label .......... 65 incl 44 lb. .25 incl 16 ie Rader da Ee US Re H. “Dp em Fie Ole SMR. Ase 'S Cr Or, &M Paes Y Ounce and pound prices Price in other size packages Maker or Brand peroz cont. per ib. cont. size pkg. per pkg. cont. MRPEE s/s: Baker Analyzed Paeebiad ees 0 ch: :0Glem sie RRS - 0.001%) —0.001% al Typical 0.001% f Analysis .trace, BARIUM, Phosphate, ¢-.ps:..\. sien... 5... Baker Analyzed CRP MGStcbet OSterssac ceo crt cts ee Sulphate, coml.. BAN EE eri tos ncc Sener eee & SARS Seton CLG CC cOD Reeser te eae tei se Sulphate, c. p., powdered... Ast Baker Analyzed 33-8). <2 SSO cba Clee ee fka Soe eit sé Sulphidesmuress 42a. see Baker Analyzeduieut).ic cscs co -65 cb .07 VY lb. .20 incl Chex ae 0.001%) = ; 0.003%. Typical Free S ... present Analysis LG ein Bigy 35 SS TE CORON anos IIO Oe trace BARIUM pulpuide Bee epeie sptonisne aia sc fi Merck Blue Label .......... -70 incl VYlb. .25 incl BYSONICSS SoS cracls ansie «0 =)s less than 0.0001% BARIUM Sulphite, (OH 1 Dad cick Heeb EN ERE oD ORE IOISC E iepmee E aG SEO CON OM cer creme Peers ae see “9 MARtrALE GC sie ci-- o)o sais i Laat eee ss Carbonate mpure cere sre ioe scores craic cicrse elected Meee AO. cb: 08: yt: 002% ieee Ae OR in oPhit aU ER Hi: TASES ODNMITLVAT GS Gi SOF MM eRe BAe ON SY Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. per |b. ms cor “in POR per pkg. ants CALCIUM earbonates C.*pis-08.5-5.- paar Baker Analyzed _.............. 60 cb .08 Ylb. .22 ~ incl Or ee ee iaratvidajcaeizjaraistete'sle lo INES Set inrctsine cd eelcidis wisiecteeiclase ws none| 1 ee OR aaa IS Phas 2), cee doe o ac DoSepaaecenesaan trace CALCIUM earionates precipitated. ss cpl Merck Blue Label .......... 1.00 _inel WY%lb. 385 inel eonklonic “Nitric SaaeAcebs Auias ree metals. PRE Loge sane agnesium Sota ers a ess an \ Guaranteed Sulphates. ....... less tk 0.0125 C Ghee et: less than 0.00030, Fe Sei ( Analysis Phosphates... .less than 0.001% as P2Os Alkalies and Calcium Oxide not more than 0.02% CALCIUM Carbonate, precipitated. . Kahl baum OP Ae? cis case ioe ecatscaieees « 100 grm. .75 incl sf Carbonate, precipitated....... Kahlbaumt ‘CiivAcy ceo: octaateta tiyeieis terse rue 500 grm. 1.60 _inel Magnesium..............-. \ CanueEouEh = Sulphate and phosphate ..none @hiloride:s sie: scteces cen ee none \ in 10 \, Certified Soluble alkali............. 7.5 mg /grams / Analysis Solubility in dilute Acetic sca \ complete Heavy metals............. none CALCIUM Carbonate, c. p., for standard- NZAA trates saree Senate ancta ioe oer Baker Special setmes.4 wece ne 1.00 cb .08 Wlb. .35 incl < Carbonate, (Iceland Spar) for AU ANIC ACU ZIN Demis foetal «Matic aiat eae oo s.e siskeses 28 A5 incl 4.50 incl |b. 1.40 inel < Ghigrideveranularspurihedssqy sce... los. ace | eee eerie Orch ee Oe rears leniency fe Chloride, pure, lump or granu- IE TR Gril N OIRO E Rage ot BOGS Seema oetee Eats SEG e Tt Litre arenas OPAC) Oya CD ay ORI Pe cre soe ie Chloride, c. p., anhydrous for coy tubes, 4,8,and12mesh. Baker Analyzed _................ HOC DING) peer el teen 2 0.001% | Reo Gumens ae RET” ee, trace soe T 1 Ae Oat A = Analysis SOs csetec nest ncsientceseries 0.001% CALCIUM Chloride, dry, prandlated tooee Merck Blue Label .......... A5 mid OF ee one Bote racer Neutrality....less than 0.0028% as cae Guaranteed Arsenic, SSesicaepaadone:, less than 0.0002%){ Analysis CALCIUM Baker Analyzed! jaws secre 35 cb .08 Yb. .18 incl i Ge rarest CALCIUM Chloride, crystals............. Merck Blue Label .......... A5 1 Ke) lire es Menai hl yee a ee Substances insoluble in Absolute Alcohol. .none pea nee essai Eee oe Z enone Bec esents =, . less n Ss nessa salts ess than 0. 00175% as NHs ye Baran ee ees Scene osetia less than 0.002%( “"#'¥S!S MATHANIG Soci ce eles vas gene nae less than 0.0002% iNitrates?:-2.o-ee cece less than 0.0032% as N20, CALCIUM Chloride, fused, tested reagent Merck Blue Label ......... 80 incl Ylb. .30 incl & Mhiondesanhydrous, -BplCkS see senite cc oeeieeeace eee: AOC) sOQmea dade ciaectdemetns “ Chromate, c. p.. TRE « WARe enero oe 1.25 cb .08 4 lb. .40 inel e Fluoride, native, ‘powder RED nec ore ened.) Hee LON CC 4 |} O4sge i ipers ENE Meiers sisisstes ss ISIMOKIMCHGMD Sasa ss Baker Analyzed _.............. 1.00 cb .08 Y%lb. .35 inel “ ONMALE HOS Pe sae Gist. eee Baker Analyzed’™).25 2) 425.= 2.00 cb .08 Y lb. .65 incl ss Hiydroxide;spure:-.. 22sec... - Baker Analyzed’. #......- ADV CDS 08M aay cies: eet se ae “So cee ae Merck Blue Label .......... 60 incl Ylb. .25 incl ‘arbonates. -less than 5% CO2 ita. Soe Jess than 0.1% Alnmnina. ORT less ren 0. 25% FANG Cusreweed Sulphates. Lae nace less than 0.03% as ‘SOs \ y Chlorides........ less than 0.002% as Cl CALCIUM Hypochlorite Gileacking 1 Pow- der) (Oxychloride).. ea Hs cto ond OS ED GT IE SP tas ee 1can .10 inel oe ER Gc Hi Leen Ceres pe ee pe ero seca e eae me Loters Alay a sazerevedsie recs, cou sts yoceteialapaie 10 lb. .60 incl se Hypochlorite, c. p., (Oxychlo- EBLE) a pg rue 1 Pee eT Cie ae arte ho SOARS c Bena Ah eres Bie 55 cb .08 Yolb: 225) nel eM re et wince tas ce ks % ee Beets (oo 184 Soc eee eee Baker Analyzed 15 incl .90cb .08 Ylb. .85 incl Me Pen ieeae ato asock tee 0.001%) MO Eee Ce See 0.002% | Typical 12} 50) sa Se one eee fa Sec hone (- Analysis Bi areeeece nee eon. —0.001%; CALCIUM: Oxalatestcs pi. esc .ac sates BakerAnslyzed4. “S-ee 1.40 cb .08 4 lb. .40 incl s Oxide Caustic tloime) ys cnc ede ke AMAT ee Me) 3)se rota WOice: 05 eile BRERA PX VRS ET ae chive Bales ie TT, HiOe Mavs GO °Me PR PAS Nee SN Ounce and pound prices Price in other size packages Maker or Brand peroz, cont. perlb. cont. ARS pkg. per pkg. ean CALCIUM Oxide, from Marble.. Hee Baker Analyzed ...... «20. 25/Cbs OF SA aeek 2 Eee BiQsteen sete oatae meta acer erels 1% MeO nohiceneamdas 500% Al SOs .200% \. Typical (Cl eaoddonsenca 014% ( Analysis AO, 0.035% Al2Os 085% CALCIUM Oxide, from Marble.......... © ahibaum. 42... = eee sD0icb, 10h wae ence XG Oxide, from Marble........... Merck Blue Label .......... 60 incl Ylb. .25 incl Carbonsice Scarpaccé leas then b% ee Sica ye corcicteicint= voles sieinies ess than Guarsnteed Alumina............ 1 han 0.25% Al Sulphates AO EOE less A 0.03% as 80s ( Analysis Ck GC Bodecss less than 0.002% ; CALCIUM Oxide......... Cees Bene dahl beam Oikos nek ie =, ae 50 grm. 1.20 inel Oxides re cis ee eae eH MloERA MONE on saeeaGe Ss | baqasoere 100 grm. 2.05 __ inel Solubility in Hydrochloric 7 Acid... = complete { | Sulphate and Phosphate none\ In 10 \ Certified Silicates a eee eet none{ grams Analysis a ie Alumina...... 7 sone ( JDUOTIGOS. .. cece cess see eeee race CALCIUM Oxide, from Iceland Spar..... Merck Blue Label .......... .......... loz. .40 inel w Oxide, from Mea aie Spagee= MerckoBlue label) sak. earn cetoe eco 1% oz. 1.25 incl carbonated ......-.less than 0.7% peso Silica ik oe eee ee ncinidekenns Salghatesl ....-less than 0.017% as SOs Guaranteed Chlorides. ..... less than 0.00015% as Cl/ Analysis Phosphates.....less than 0.0033% P.0;( Ieee Anpodogenangoeden less than 0.01% CALCIUM Phosphate, c. p., dibasic : ae r (CaHPO, ce) BIO) ea rnino straigic cocina: a os 10 ~=inel .75 eb .08 Ylb:. .25) inell ce Phosphate, dibasic (CaHPO, + 2H.0) Merck Blue Label .......... 1.00 incl yb. .85 inel ‘cil Guaranteed s - an re Analysis Sulphates..... less than 0. > Residue on ignition............ 74-7 CALCIUM ee (CaHPO,+ hk ene: 3 an ee DHE) Recerca meer ane nan Kahl baum Ci sAc) os san\-hioce psec 50 grm. . inc es Phosphate, dibasic............ Kahl baumts! © pea ccccte ote eo eres 100 grm. 1.25 incl preseue on ignition.. 74.95% ) TSOMiqrsn ese se ee RRS 10 | Certified Sup R Rte \ grams \ Analyais Heavy metals........... none CALCIUM Phosphate, c. p., monobasic 7 (eae EO: aR eG, OB Ee A A SET CAIN NA So oPereO La Soca t 1.00 cb .08 YY lb. .35 incl hosphate, monobasic [Ca(H» POs)» a H.0].. Merck Blue Label’ <.........- 1.25 inel V4 lb. .40 incl IATSENIG NYS eh ee et LOSS than 0. 0005% ay Chlorides. see 002% as Cl{ Guaranteed Sulphates......1 as SOs Analysis Henwyametalsscceeacrecnnceatieace. none, CALCIUM Phosphate, precipitated (con- tains about 96% Calcium Phos- Pl aLextm basic) emawsatyercc tts oc ata e eet exes tale eect Tye or Peete -43\ cb: 12. 2254 eee S Phosphate, fe a meee [Cas - it sae gine i A) Bete ca scexe thoe ah ans aceieioecei eee a heuteene rer ahe -lo ine 0 ¢ 12 4, et ine ss Phosphate, tribasic [Ca3(PO,)2] Merck Blue Label — .20 ine] eee 16 lb. 1.00 inel Arsenic...... ...-less than 0.0005% Sulphates.... “Jess than 0. 0075% as SO; Guaranteed Hes ; . less than 0: 002% % as cly Analysis eavy meta S.. Sato on occtisscao eae none CALCIUM Phosphate, tribasic [Ca3(PO.4)2] Kahlbaum ‘'C.f.A.” .......... .......... 50 grm. .90 inel ff AS ENS EVID Asic Gag ie Ow)o]e sah b amin Cute Accuses ieee eee 100 grm. 1.40 incl caleuee Re ietarsrch stays iaie none] | ulphate. ..none I 10 Cc ti fi d Renee IT RGRe| Tame (Anas Heavy metals........... none CALCIUM Sulphate, calcined (Plaster of Paris). . aS SE Le cater MICE, 3 0c 310,c¢, 05: 3... 3 oe eee ty Sulphate, native, (Gypsum).. Sito EOL I ER EA ic A 10'ec 205 @ 22 eee Sulphate} /¢spisco acs foes pep Baker-Analyzed) 0) ony. 5. see 40 cb .09° |... 2 Meee Al Typical Analysis CALCIUM Sulphate. . Se ee Merckeblueduabelme.s see 1.00 incl Ylb. .35 inel Tron.. ___less than 0.00375% | Guaranteed Magnesium ‘and alkalies..not more than 0. 1% Analysis CALCIUM ‘Sulphatey.--e. see edi bate SA OH int. Cae eR IER Acid Sb cc 100 grm. .65 inel 20 ever le are al” R l2be Wy HG Ow eM AY Ss Gy ©; M PSA IN. OY Maker or Brand Ounce and pound prices Price in other size packages peroz. cont. GALGIUM Sulphate: $220. . <8. 5c eek rc Kahlbaum ‘‘C.f.A.” Iron Oxide........... Mince aqone ee none Alkalies and Magnesia present te In 10 \ Certified after precipitating Calcium.....3 mg. ( grams ( Analysis Miipriesia) e528 iycice ncee be ciscceete trace ) CAL GIUMar Sulphide puress. cc. sasccciccs » Uleeane Sees aceon KG Sulphide, cubes, according to Brotessor Ottogaeon) so loonie a Rees ce Sulphide AS aHeaeeA Soetrres Merck Blue Label ATRORIG Hine sce cso less than 0.0001% CALCIUM Sulphite, c. iS ae cnne noes Baker Analyzed ManiratewCenpoewsa-ccws< <+ Baker Analyzed CANADA Balsam (See Microscopic Mount- hiv? IM GbE) ats 36 SOanonied Oak eae dc ones eae | SETS LORS ats NEY Ln 33 hee CSE aa cy OR ne *CARBON Bisulphide, coml. “(also furnish- ed in 25, 50, 100 and 500 lb. cans, and 1000Ib. drums. Price on ap- LIC ALOT) Mae ee ee EE ne Sessa Soe *CARBON Bisulphide, Gop sas tae he: pes Baker Analyzed Seqgbsoaqetaaccooe Aaqce6ee5 27% ne 16-40°C] Typical Rete "Rene, Analysis Nonvolatile matter. - 0.001% SGARBON: (Bisulphid@:s-< 2.24: 2sa-n0< 660s Merck Blue Label Nonvolatile maiter....less than 0.0008% Hydrogen Sulphide and foreign eo Guaranteed Sulphur compounds............. none( Analysis Sulphuric and Sulphurous Acids...none CARBON Dioxide, supplied in seamless steel cylinders containing 20 ROSE ACI Mr tetera es serra eee islets si neposte masa Cylinders purchased from us will be refilled at $3 00 each. ¢ Metrachloride; com aati iene wee toe ere as “ Metrachloride; puresssaacenane, Coen eats Secs . Metrachloride; c:p:..2-.5..2.-- Baker Analyzed Sp. gr Sapandanen Tec apee ical a Chlorine... mane Gi Taio Neier etree eres aT 0.0004% \ CARBON Tetrachloride.................. Merck Blue Label Nonvolatile matter......... less than 0.00125% \ Chlorine 225. oie sescenisings oe less than 0.0002% Hydrochloric aoe .less than 0.0001% as Cl\, Guaranteed Organic matter ie ian: dee vie o's bcwetie wees mons Analysis Aldehyde eee ch cc soamstaacicaceroece one | Carbon Disulphide............ less than 0. "02% CARBORUNDUM, powder, 40, 60, 80, 100 BANG PLSOWMeg aS IME eas 3c aics Seo To Seats waste (GOAT “OTD 20 eee EC a eee Ree eee CARMINE, No. 40. eae mae io el eyes epeisore seer WARMINED 2.) 0.0 22 cctdee s!coteets «al. ae Merck Blue Label Sears proper solubuity) Guaranteed ar hi s Soe ciate than 204 St CARMINE- Fibrin, tested reagent.......... Merck Blue Label CASEIN, PrOMPMIUMC WASHEG secs scisie eres cs apa. nla ath wiaveyal sisters according COMELAIAIN ats FEL eee ge ieee eae ee eee CASEIN-Sodium (Nutrose), in original GONMUAINETS erste ey) a aie meee ae BOMELOUDEN shreds: 2202. s-n.2e2 net teases Schering CEMENT, Gutta Percha, for sealing mu- ECU SERB ho oda MEEHObDOodE otoasdion “ Gutta Percha, for sealing mu- SENINYI AES Herjs\-1o8 Mee. Self CERESINE, eke eerie nn ee Ee gota mctty white Re eee ciias! | Canalis capita ss OL OW AOR ee isch i ated scia tiptoe are °CERIUM Nitrate, CTANUIAL Sear nese cere a selo c/vehopolreelaeeie * ISLE Top (Oe Ob Gee Be Sie une aoe bt nk ees OR eS EAC OES a Oxalate, pure.. | SROs Bes Cio Ons Semeee neers “CHARCOAL, animal, granular . OCROROOS- 4 etic IS coe DAC Onee animal, RVOWOOT: err ot oes. cicero cee es oil te 2 ce IIT Al OUTIHE UIs totes hvac ese tae eee > ) Incl 52 .h a ee Active chlorine ..... yields at least 25% by weight rl GHLEORINE Waters..ne kee eee Merck Blue Label .......... 50 incl ©... 04 eee Nonvolatile matter...... ......less than 0.0025% | Guaranteed opeane INciditesiaes caman: less than 0.018% § Analysis [CHLOROFORM HU SS pha. dee ostneeh ani eee eas Sicereacraras 40 cb .08 5 lb. 1.90 cb .14 “CHLOROFORM, c. oi retepnialageheroteloce sishaeestete® Baker*Analyzed — i iveos ase 1.00' cb: (08) 3. 2 eee Sp. gr.. . Be 122 es nee crcl Typical Free acid. none ( Analysis Aleohol... ..... —0.038% [CHEOROEORM erator cen cot eee ee eee Merck Blue Label .......... -60 incl Ylb. .25 incl Nonvolatile matter.less than 0.0014% Hvdtachione Aid tos thn 20001 | Guaranteed Phosgene Fee aan one none eT Aldehyde ckitiweetisec ca vsiamace none Foreign organic matter.......... none @HOLESTERING eee ee Eeablet het) eke. tates ac eye a 10 grm. 2.50 —_inel CHROMIUM, metal, c. p., crystals....... 0 2... - st eeneeee vee eee eee legrm. .50 inel Acetate, c. p., basic........ Baker Analyzed Ne paigeiuereme CONC OME OS: Yilb. .65 incl ss Ammonium Sulphate, c. p- (SOSG solution) ease ees Baker Analyzed _............ 1.00 cb 08 ee ee ss Carbonate, c. p., basic..... Baker Analyzed Sept einis e aeO ULC DIL O Yb. .75 “inel ss Chloride, c. p. (50% solu- LOM) easels ea Baker -Amalyzedi ts merece ser 75 gb .15 Ylb. .25 inel Rend eecaphet: 0.030% Ni R ai ianalt Typical none ( Analysis 0.050%) CHROMIUMN Chioridesespr gary ns: ccis oeet ne ceicctelertnicier “15 incl 1.50 cb .08 144 |b. .50 incl xs Ey droxide.scptasccee sore: Baker Analyzed .......... 1.00 cb .09 4 Ib. .35 ~~ “inel 2 ee Nitrate, c. p. (40% solu- LLOM))easer a vaseereris BakenAnalyzediaie...c.---s 1.00.¢b .15 ........2 (RRs 2 « Nitrate, c. p., dry.. a ae AL aad BRA Tere 20 inel 2.00cb .08 lb. .65 inel “ Oxide, c. p.. =. Baker Analyzed aes. eee: 1.15 cb 09°: 5-923 eee ce Potassium Sulphate, ‘pure CEystalsa(Ghromesnlurm) pease a ee eee wee eee A5 ce -05. s.3.j25.,.0) oe: see sé Potassium Sulphate, powder ..............0-2- 0 weeeeeecee AS ce (05. oS cc acjan eee & Botasstuan Sulphate, c. i . Baker Analyzed 10 ~inel .30cb .08 Ylb. .15 inel CO een oe le repeal MeO Gy wnsaers Ba eeeieatines 0.001% ¢ Analysis GIRS St oree een 0 0019 CHROMIUM Sulphate, c. p. (30% solu- GION) ewes. Chee Baker Analyzed .......... 80 gb .15 Yb. .35 inel es Sulphatemonpendhyceeepeen eee acinar 20. incl 1.75 cb .08 Ylb. .60 inel se Trioxide (See Chromic BGG) civcaccisleetinenea es | valemibicie sls | Ree p hee Gaeta aa CHRYSAROBING eer eee Che, ocanmechobinecenine Cac eE ae 3.50 incl Yb. 1.00 _inel CINNABAIR Sredinc: mech eere Cnt ccna een cee tnce yeni oe 1.50 cb3.08 . cine) | eee COBALT, metal 98-99 icubesinvtdiossic eile claw oe ciee sae aie 50:cb .03 ........ .sslece ot see eee metal, c. p., (Nickel PLOE) es crret menace ead Spe ska ioe Raa ae ee Ee 10grm. .50 inel « Acetate, c. 1S eee qa acetate Siete nits ie ee anh ire RR Re 4.00 cb .08 44 lb. 1.25 inel : Ammontunt Sulphateyc. piceersmies ence ie wees | sie nodes OUR DIOS Y%lb. .65 inel Bromid e356 Free eisai oes tee. eerste eters 500s incl _...x.ceese beter s Carbonate, c. p................. Baker Analyzed odisormenGu weaO Cb Peel Yylb. .75 — incl - Chloridexcspieacn erence eee Baker Analyzed Ms onsee, “ea Glan “ANS Ylb. .75 inel sé Chloride, c. p. (Nickel free).... Baker Special 5 ANCL aiinaye:. cS) eeoiate Dee Sek ee oe Chloride (Nickel free).......... Kahlbaum........ athe incl JOA OSS I ce Oa OR Lee, COR Mi A Yate AU) ee Maker or Brand peroz. cont. per Ib. “COBALT Riatente, ¢. pe ... Baker Analyzed 20 incl 2.00 cb 0.008% Reed | Typical .none ( Analysis Ss none, POOBAMM Nitrate 35-5252 5 5. fe gcccaere. o.. 3 Merck Blue Label 40 iy eee ee Sulphates.........- less than 0.01% as SOs Chlorides.......... less than 0.002% as Cl Alkali salts. . not more than 0.25%‘ Guaranteed i .....less than 0.5% / Analysis ...less than 0.02% less than 0.002% *“COBALT Nitrate, c. p. (Nickel free). .... Baker Special 75 INCL eee Z ce Nitrate (Nickel free)........... Kahlbaum........ 75 inclaees see ? fe Nitrate (Nickel free)........... Merck Blue Label — .75 EITC bimoger ch ere Nickels = .Ss-s5 occ ne = less than 0.02% Wie ee ori es. * .1ess n UV. a /O nee G te d peace | Analysis. LOG eR eaaocmacnces less than 0.02% CAN WEt se heres Sot on less than 0.0027 ROBAUT BO xalatessGsepeeiaasacachHanea el, aeetes See osloan vee ve Se siteetores = 3.50 cb ue Oxide Weim tesa tera ese 3a baker Analyzed) -— . sk asrt. adsl 3.00 cb es Oxide oS ROS Sk nk Merck Blue Label 1.00 Ine ies Pees Sulphur (#3!20. 2. - = . at 45 ee 1% |b. 1.25 inel Bp boosdocccs OBS Wale (n\n. winidie:arclqieissjaihinteiare a'a ofeis ; “ palate ce eae se Jecapleseeeaaseisis® celetavineee © «0 CD" OOy mera ares ove 2 £6 Niteate; GalDeceee ech se ae Baker Analyzed 10 inel .65cb .07 \Y lb. .24 inel Rotate eae 0.0002%) ‘typical cr shee aes Sk coe jp Sales COPPER Oxalate, c. Dp. Be Reet Nei eerste Baker Analyzed) 9 =. cca-n 1.50 cb .08 Ylb. .45 inel ce Oxide, c. p., black, fine........ Baker Analyzed = ........2: -80 cb .06 Mlb. .385 inel os Oxte? c. p., black, coarse..... Baker Analyzed _............ 1.00 cb .06 Ylb. .35 inel 0.010%) typical Nitrate Sitciajeie ise omeniasicineraicierie esis : sae Analysis COPPER Oxide, c. p., wire......... 6 a0is ae ‘Analyzed s ) /Meeseee sate 1.50 ch .07 Ywlb. 45 inel 5 WS 02%} a S COPPER id levee) Baker Analyzed) | iajeaas 1.50 cb .07 lb. .45 inel nboode 5 0. 0.020% Typical ¥: He 0041 OE COPPER Oxide Asbestos................ Merck Blue Label 1.00 incl) Sea oz. .3d incl ss Pieeine CoD tas cance sie siskercness Baker Analyzed Seccccs nce 2.00 cb .10 lb. .65 ine) os OEE Chloride, c. p........ BakersAnalyzed ..s.22:+ ac 45 cb .07 4b. .20 incl 10) OF adn ssannoscgncoustsacoaos #2. PB nod asec sadee at Serie Se. onnoe 0.0003) . : of. Typical Nia occ eg At arbon (soluble).................... none COPPER Potassium Sulphate, c. p........ Baker Analyzed _.......... . »0cb .07 Y%lb. .20 incl 3 Sulphate, coml., crystals (Blue ISTONG iis reir ie ate igre asco sve SRI Ios oe So pe ie ee 10:ce | 05... eee s Sulphate, comlsn(powGer)-eeecee eee eee ee ene . Bice: (05: 0c eee ss Sulphate, pure, cerystals... AA ey ae Rare 55+ Ae 20. cb 07° (bie. a eee sé Sulphate, c. p., crate S, coarse orfine: sees Baker Analyzed Pee sans 27 cb .07 Yylb. .15 inel = Mnaitsietaicias tie ciacin se eicaeare $6 Sane o} Aaplcal BERS TDOU ACRES AESGOS mo % nalysis COPPER Suishats SRN Nes ar ee en ya Merck Blue Label .......... 60 incl Yylb. .25 incl ale of the alkalies, earth, etc.. ue more an pee \ eranteets WOT Sono hid s/alboleloletelalvicis’ate1s waa ofatal ns not more n 2. vy / nalysis COPPERSsulphatescnae-s seen eee Kahlbaum'@# 429, «50.0 5 Ree 500 grm. 1.15 incl ce Sulphate oh ce oer ae Kah baum iG: fr Ae es ee eee eee 1000 grm. 1.95 incl ING Sa55 a nedeuosodonecned 0.15 mg i) Alkalies present after in 10 ( Certified precipitating Copper ...1.00 aoe Analysis GOPPERUSaahale: ¢ pam: t. pre , C. p., eryst. precip. r Ps by Alcohol. Baker Specialy es -peseene: 50 cb .07 lb. .20 incl Siar e : A eAeeras COPPER Sulphate, c. p., anhydrous..... Baker Analyzed 10 incl .70cb 07 Ye\b. 2anel iy Sulphate} anhyidroustn pumices: &. ne esnasceceeen aiecienton 50\cb .08) |. 225225" eee Geile bis. JW) IR Fare Ue ce) OP Mp CAR FS: Choi eM BO A Na Ounce and pound prices Gnicel in other size packages Maker or Brand peroz. cont. per lb. cont. COPPER, Suiphide remeron telotreue th Ayia seiko aeons ee ae ue 1.25 cb .07 Thiocyanate, c. p. (cuprous).... Baker Analyzed .......... 1.60 cb .08 COTTON, ENDO Tg OSTA A. ney Mere ches eck tai ee are em ed aN there 35 incl MGn A DSOLDEM tee ere ar Mawr ee cere ioloece eA ReE. 35 ~~ incl ss wool, specially selected for plugging culture tubesseesacics | titans tea eileen. = Son Bee al CREOLIN, PPeorion! BEER aera steric ware tena rece soon AiO es °CREOSOTE, from Beechwood as recom- mended for use in biological PADOPALOUIES Viren meee ciseocies. Senn ae aT LOOI Mlc kee oettek 80 gb .09 3 § TMOMPCOMMMALS Pere sects acy aes hook TO Locke 40 eb .09 CUS Hy rt See) eat (615 Ss Nee Gea ven Pe i Mt SOR ew .25 cb .09 CUBES, Chlorine, for generating Chlorine (Also see Chlorinated Lime).. SAG CRS Et Eee arcade pact cheek cee Oh ems -30 cb .10 sie ts’ Oxygen, for generating Ox y g en (AllsotseelOxane) Ret setter doe ote er cette | tee ee ee Meee a < Sulphide, for generating Sulphu- neil SANG omnes gueesceks san keebee Moceesoeaer 45 cb .10 ee Sulphite, for generating Sulphur- OTP lige Sea eae oe tc ici ee VAS 79,5 Coen SRE 50 cb .10 sd Acid Sulbbarbas; 207on' tested re- agent.. Pee VMerckablueyiabpelleurns ce -60 incl RET NUATREN Brees eerste eee, ee ou eee tien SoICD) LOousepmeieee CUMO Len ere ee ER Ros nace laabibepe Paes daee ee eeksancces 70 cb .10 OLIRA RE RucsLEOMer Emenee EPrints Aelosrciaanren inontooncr Lcatiintinae scot cuss DEVARDA’S ALLOY (See sate) DEXTRINE, yellow, coml.. Bake cheats, seers RID oer se avsies ce .05 sf eae COmm Ie SiR leet cee Lee wionrchnnes 10ce .05 ps alcoholgprecipitated =: fos ete eee c | Pee eee 90 cb .09 DEXTROSE (Gligose) White wUIMp rs sse or ee eT EEE, epee 10 cc .06 au ae ULE CLANU Areca ap hase a Nec Sah cra ee -l5’ee 05 ee MAND Y.ALOURN cians see eaten eee tee See 15 cb .03 1.40 cb .08 DI-AMIDO- BENZOL (See Phenylene- diamine) PERMA ICD NIP TIN Rennes tree ccs cra sicis ois Pa nies nai ere arene Ae idle Seu onedee TASTAS EVotsMalt; @QWaltine)é24 0060805 sch oc sceee ce ceee. 165RC DIOL Fos cee ann DICHLORETHYLENE.. FOOD ISTORII S OS AE NI ME setae = 35 cb .08 DICYANDIAMIDINE SULPHATE........ Merck Blue Label 60 Inclye eee) Tested for suitability as a reagent for Nickel DIMETHYL-AMIDO-BENZALDEHYDE (Bara) expe een nes Kiaihib atime) Sieeene, (Ox ee ance ee DIMETHYL-AMIDO- BENZOL (See Di- methyl-aniline) DIMETHYL-AMIDO-AZO-BENZOL (GEER (0. inG oe Bioc/aet BOOGIE Et oem EEE ee ee ee S90 ie bint OS we crtoe aire: RVUETREDYE SAINTEEN Sc tejaricte sec ais cee wikia roreins RE 15 cb .03 1.80 cb .09 PVR EV TG OXIME, co ncccc sce ceer cs. scoctwctoescboeete TSOP Serine eyes ee es Sse CaRRBRR Se Oe eae a Merck Blue Label 2.00 idl osha eee i in See ee Merck*Blueitalbelimasce cree eee Tested for suitability as a reagent for Nickel DIMETHYL-PARAPHENYLENE-DIAM- INE HYDROCHLORIDE.... Merck Blue Label .......... .......... DIMETHYL-PARAPHEN YLENE-DIAM- INE HYDROCHLORIDE.... Merck Blue Label .......... .......... Nonvolatile matter.....less than 0.05% PIMET AUS UEP HATH Deere oo 5 kiss toes Gaeeen mew. eens See 1.30 incl DIPHENYLAMINE, c. p., crystals, whitest .................. 25 cb .03 2.50 cb .08 DEPBENYUAMINE 2). oc. cone cskccses ac Merck Blue Label .25 incl ...... a Nitric Acid . ..less than 0.05% as N2O0s) Guaranteed Aniline.. Beach, . less than 0.05% § Analysis DISTILLED WATER, © in us Cong crated bottle. . DSi Oe ce cae eb ocr Ma ECan MCC E Ene DULCITE ee Ee at Fide te ae AOL ei eniecs . naeee fone DUTCH LEAF.. ROT a as Me et kage Scat d She nS SO RTE oe EIN GE eee ee er oriere tener. chess a tees tbe ede Lea arc WOvCb ae OS ase eats PUK ONOGENE fei) 455 tess cess Se WR Lakin stays tot on SO oy Ais | Gh soe tees EMERY, fine, 180 mesh.. acidic IPP EGUE TS SECS CEI D GET Ee eee A5ce .04 medium, 80 mesh. . SRO en I Lettie Wert SA bE ne sce ahors A2ec .04 se COAERGR4ONMER he eee EE aus ORC eee, etna Doe 10ce .04 ESCHKA’S Mixture (Sec Magnesium Oxide and Sodium Carbonate): °ETHER (Sulphuric), a SP: - STL ERE oC Aa eee IRIE sa, ee (Sulphuric), U iS) be i TSIM SPRL Re AP tie ad Bee ama size ie V4 Ib. V4 |b. “5 lb. Ib. 14 Ib. Yy oz. 5 gal. 5 grm. book per pkg. conte 40 -60 4.75 7.50 35 75 4.50 10 incl incl AR U Tho HG (03 GMa Anes C- OQ) MGR eae Nias Nee Ounce and pound prices Price in other size packages Maker or Brand ORE cont. perlb. cont. size pkg. per pkg. eon PE DEER (Sulphuric) |. We SSePs ter tesscrepcisrareserchl pioystcreuc) cf eee aero 36 ~~ inel 2lb. .68 incl sites (Sulphuric); UeiSePat as on. arote fies Giese ated e ceierce oP ER ete, vets MME a ere eae 3lb. .96 incl 2 peelppuic, US eee ee Re me cae Lae Uri aam. wo Pes 2 He eg incl Shae ((Sidkoloybpato)\s Wh Sh aem Sol Glave Goo oosenoacenessn © Goenossen. 4 1.00 4.00 “ETHER (Sulphuric), U.S. P.......... Ae Baker Analyzed ~~ <5. cee 40 en .10 14 lb 20 incl Bes ioe eee aatasteocllorraeteal Aleohol. ... 3% Analysis QUA Laialote etelais alalciele/wineiaisieiaty|=ieieteletais|are 2% “ETHER (Sulphuric), concentrated........ Squibb) SASSER NGET Rae. lb. .26 inel rides (Sulphuric), concentrated........ Squibb) 7. St acoay-ceree ree cee Melb. .45 — inel cabs, 8 (Sulphuric), concentrfted........ SQuibbic Pyle see eee 80 incl tILkilo 1.70 inel “ETHER (Sulphuric), sp. gr. 0.720......... Merck Blue Label .......... <0, incl! 20 eee Residue: 22s os.5,. bee acsiseisterseniee stays none ee Kerrie: Hydrogen Peroxide, anc BOVIO witateieie\s ofncate delenit none Guaranteed Spon oan ae one Analysis Acetone....... . less than 0.005% ETHER (Sul aie) each Nene less than 1% 40 tes : ulphuric), washedw-ctcn. cee sane os cacraacaam LSet e incl! 22.2 eee Pip ass (Sulphuric), washed. . BakersAnalyzed) ~~ -ascenne 95en .10 lb. .85 incl areonel Caleantialye iecaeels hn ane etaeni wake tre meal iypical Water en ea See eee Sa ee nalysis °ETHER, Mistilied OVeD SOdlUM. ys 4. ee Baker Analyzed _............ 1.25\cn.),10)..¢..t5% dele eee Bik a eeores 0.001% pe ater .. trace °ETHER, distilled over Sodium............ Kahl baume - 15 0 OL yahasdes, ae eeaer 500 grm. 1.35 —_inel Sees distilled over Sodium............ Merck Blue Label .......... -80 inel. 2.335500) eee Residtie!t: & s.snictasnnetes Soe etcecne ree Peroxide, Hydrogen Peroxide | an zone... G t d saat saa at “a ( Analysis Water) 2eccieca dee mene less than 0.01% Alcoholis2522. sane eee less than 0.3% SETHE RRA CEC 905s RW crepe tee ricco) Bae ee soiree Dac ps ae i ep te ami gegen ane 3 SS PACOLICHO SHG Waite ae ae eee eo ad eee ee eis icice eee tetera ee 80, cb);.09 .. eh Sie eee RULER RISB DATURA Aen cle Morn Sea ante een Lin eee ary -10 incl ..5.:. 9) ) eee IUIR URAL. kde. aeene ee ss PAS Meet AP eR, OT RE Th cb .04, 0.2... ba Jochen ee FURFURAL, tested reagent. ORM OE e : Merck Bluetiabell | = 9225 i ees 25 erm. 1.50 —_ inel “ tested reagent........ Merek Bluewabell etceens sn ae eneeiee 5grm. .40 inel °FUSEL OIL (See Amyl Alcohol). re, GALACTOSE ee era. sar ed peste de oii be oa Mawar 80 cb 104 2... 2. eet ORES ee a GALLEIN, dry, tested reagent. . Merck Blue Label 1.50 inc), Ay. aee i055 Yyoz. .50 incl GALLNUTS, MLA VOR LT CKO ae Lreiels Ve mul Aion scrovelen a tcotrce Olt asetoraL eee -30 incl. |... ests Se eee Powdered res pede Aker ioe eke sere Geck ea | CAR eee 45.ce 06: si whesh Sie GELATINE, Gold Label, specially selected for preparation of bacterio- logical culture media........ AY SEW COR OoUy tora soocas 60) -inel .............. 1.00 _—inel GLASS" WOOL, best Bohemian, Lead frees: ae SHI ine. -65 incl 6.00 incl best Bohemian, COATSO ie feos oo oe sees on -50 incl 5.00 incl Us PesiBoheumans Anclo, 2... eee nen eee ee 55 incl 5.75 incl GLASS EW OO Ure test csovaes one nee Sues Merck Blue Label .50 incl .......... Sooner stig not more than 0.8% Guaranteed Lead eee ne ... Jess than 0.0025%, ) Analysis SGEASS SS PEO WMLCL AUT er Ce Tn fete nee hoe ese eit cfosbrsucta ate Ae scene eed -10 incl GLUCOSE: (Dextrosee whites; lump ns. csk. | o5is vse oe nde asm erp & cos Selec g 10ce .06 " (Dextrose)}csp-ranhyGrous'..'2 © 2.82 e oe. we cece ces cb .03 1.40 cb .08 GLYCERIN, CRD ERNE UULAL OME See ene ie eet Re te i ae eae eo 35 cb .08 Go TPe-, TRGINUTEA shan t A pean et eae ISIE ene ae Se ae ea eae 28 Ke CAP MPUCIULALeN eset lt Beer Sen can se Ee wen tee RENE “om corc 25 In drums of 550 or 1100 lbs., price on application. GIGYGERIN, Sp> er. 1-25.) 22 cnn ts heh ns Merck Blue Label .......... 60 incl Tisai for, Stes achat ais ance ee acs4 uNOutraAHty Arsenic... Sree ..--less than 0.0012% Inorganic matter sta: to hocks scutes less than 0.008% Substances which reduce Ammoniacal Silver Nitrate solution: 27° - 2 8a- en ee cue ee ae Fatty acid esters - eet than 0.115% as Ethyl Bobet rate Hydrochloric Acid and (hilpridea™ soe cs c)-g es & less than 0.0004% as Cl _ Guaranteed Sulphuric Acid.. .........less than 0.0024% as SO _ Analysis OxtaliovAcid. ss ieseesteaceseee eee less than 0.0064% Heaayametals sy concn Jace celoeess cabins ...-none (CHIR one Ce ae ee less than 0.005% BPA se yeep = eee cso less than 0.04% as siti Readily carbonizable matter.....................- none Dextrose and organic bodies................ none Ammonium compounds .....-.less than 0. 003% as NH3z GLYCERIN, See [at Ree at SOE Merck Blue Label .......... 60 incl Same impurities as above. SO 55 bbb On ds Daren DESC ED MEE GSS CEL =a on ae nmnnEnEt re tae = one “SUED LDA oo Deane le Ot 9 ee ERS «7 ne ae ee eT Oe) A Sanaa eee “Chloride, pure, ery G1 Se Gate GOn cere ae CS oP ne Re oe, eee GRAPE SUGAR (See Glucose or eeroe): GRAPHITE, powder.. : CMe Arlen sya are cardio Mek © sce lice .06 GUAIACIN, tested reagent. Sel ets: te obs, a8 03’ =f Merck Bluepliabelisy = -2 sass 96 Acne se GUM ATADIC mW OLE PTANUIAR ye seen) hae oe sinie cetera ae l0ce .03 .60ce .05 Arahicsawhite, powders <.a.2 002000 | f. socks | bean 10ce .03 .60cce .05 ‘“< Camphor, refined ae Dec EAE ICUS ACTEM IER I eA gcob eRe Bere stare ne 1.00 cc .06 AS UV EN TEE ses chs Ain ity ee OCR CF epee Oo re RE ete ee 45 ce .05 Ses) Guaiac:.-.... oe LAIR aa Gh YEAS Obie CREO IEE OS Tee SRC OCOE ae SE aoe Ba 50 ce .05 BME EANULCNUCATS Gee ns sorte Cecifeecictscs. | Santa cteee tees see. lscrgyalestear 1.15 incl MSIE tac woranresaker me. cnnmihuy Gece deed ee ansenes Esiemedseiios 45 cc .04 ENE MAC I DIcAChe Uns meet eas honored: sik ec tie cam econo: 50cce .04 i racacanth: powdered ..5:...0- i... sees sesh oes es eslslsis) sisrelnescisiss 1.00 ce .05 ROME SIVIE ea GMs phate) esc 2s ack) an oe asset de v9] rj < (S 9) ao) oI Ls OS | Oe GC O° MP AY aan Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. per lb. cont. size pkg. per pkg. cont, HYDROGEN Peroxide (Dioxogen) ....... Oakland Chem. Co. .......... 65 ine), 2.2 ac eee S08 Peroxide (30% weight)..... Merck Blue‘Gabel") 2.5. cance Scere 200 grm. 2.50 incl s Peroxide (30% weight)..... Merek Blue Dabel. s..mce-eats! sea 50 grm. .85 inel Mreeinclids seas. ctu see das aa anineeSuNerene Sulphuric Acid . .less than 0.0075% as SOs Cece eet ' phuric an P Guaranteed FAMIGS TOUS.) cer ceccoscees less than 0.0045 Gain eee neaen re Shan 0. =A Analysis Hydrochloric Acid....less than 0.0005% as Cl Hydrofluoric Acid............ less than 0.005% Phosphoric Acid... .less than 0.0006% as P20 HYDROGEN Sulphide Water aictenelay ate afeisee Merck Blue Label .......... 50 incl. ..x.netse) -ceheee weet msec sec eecenccesesceees none HYDROXYLAMINE Hydrochloride....... Merck Blue Label 1.00 ine)’ is 2 eee oz. .30 incl ienrolssie Shee =tposcoe ne ean ita | OTIGO.. « cescces ess an Sulphuric Acid . less than 0.0005% as SOx} Guaranteed Heavy motale? 9. soo ccc wen oe at most a trace ' Arsenic San sated nies Se cee less than 0.0015% ICELAND SPAR, for Blended ang. Sood st Nee ptosste tase: 40° inel oi... ctcceteseete ee INDIGO, Madras, lump.. : eee Wen PS HE Sih. csore sree woo. AD CC 04 Oiet5 ee f = Bengal umprecesss seach end Meere aco eee 10s inel 1.25 ce’ .04 =>. 2 ee INDIGO, egetable, GOU;seeee ..... Merck Blue Label .40 incl ... gc ee sg cee Sore not more than 12%) Guaranteed i ..-not more than 6%} Analysis Yin COLO CEO Merck Blue Label .50 incl .......... Woz. .20 inel bed cosas atcecnns ose not more than 1%) Guaranteed See noo taeda: =k not more than 1% J Analysis INDIGO Solution, 1-40................... Merck Blue Label .......... 75 inel lb. .30 incl INDIGO Solution, 1-1000................ Merck BlueLabel .......... ofl incl lb. .30 inel INDOL BEC ADHD BORO ean OD ORIAd Cot Ieee neat: Manet he iy eres ir moh do grm. .55 incl Mes Nate Tea ale Dhaai SS oly Hos Pe VATE WE See S S265 See grm. 3.00 incl INEKUSORIAL EARTH (Kieselouhr).t2 0... = ee See eee siiee o-oo eosin AQee (042 2... SS INULIN, white (Alant Stareh), Bee havaandsidns gakuen Wea clahision ojos Soe 30-ee ee 10grm. .15 inel i Dessendark Sore es Scrat Peer ite oA Se Naa eens tele Mee Reeeee 10grm. .25 inel re Kiliani.. COU CU I, ean eee etn ee 60. incl See 10grm. .25 inel FODEOSINAsateruk ce tsees vo teae seven Merck Blue Label .75 inel:. arc oseeee Yoz. .25 inel ested +=? se ccecccies for sensitiveness IODINE, pureyresablimed:s.00 5. <) cs eceen) -secee acs cents 35 gb .07 4.25 gb “13. (2 eee FODINE? resublimed {acco c.2 ss ene se ee Merck Blue Label .45 incl 5.50 incl 44 |b. 1.50 __inel Nonvolatile matter ........ less than 0.05% Cyanogenes:.. Ss ceceetee less than 0.05% | Guaranteed Chlorine and Analysis Bromine...... less than 0.12% total as Cl IODINE Bentoxiden capt sce sefe-c oscar oc Mae ec eaetins aes 1.10 incl ...0.0.2:5°.2..0 =e FODINEMWaten 6-24 eee e cee 3. nace Merck Blue Label .......... 50 incl .....cn5 eee UES nS naeBooosctoccoe“annr for strength PRONG Bilinga. coarse gareectee cons cere ee Soaks ocrerstntig | alec baer 10 ce .04 © ....5c)- eee pe ARIS kode sgoesac eS eOOSHSSSED Be aO NENG ener eet & 10 ce. 04... 21. eee nei eae DYDERY GrOv ENS WOU arenes aces Son ae ee eo eee oe 55 cb .08 ........4:)_ eee TRONG@bysbydrovent-cseen eee Merck Blue Label .......... 1.25 incl Y%lb. .40 inel Residue insoluble in > Sulphuric Acid. .................. not more than 0.5% Sulphides cece css sae ee sewers cate. less than 0.007% as S\ Guaranteed Sodium Carbonate................. not more than 0.06%, Analysis i not more than 0.0028% sohtho ee: less than 0.0015% MRON SE OWOGE 6-10 sicsceiee ecieee Soi eiesic cans Merck Blue Label .......... -50 incl YY lb. .20 incl Tested for insolubility in Hy: drochlorie Acid Nitrogen ...........-.. not more than 0.0028% | Guaranteed sAYROIIC 5.65 351s 2 )s515 less than 0.1 0015% ( Analysis Foreign heavy metals none TRON Wire, for standardizing, on spool... .................. 15; _ incl) ee eae Ylb. 30 inel Wire SISAMEe aS ahOVe saccade | sac Seams cts eevse acu” alee Se ee Ye lb. .45 incl “Wire, for standardizing on Bpoole so) oMerek BlueDabel’ 2.90.0 =. pee 50 grm. .50 inel “Acetate, c. p., solution, (erric) ia o Sean en cant ae seeeesees. 030 Cb, cOS 42 cee “Ammonium Citrate (Cerri) RES er ook arate ee ne ee oaese 5 Wee ecbanus lb. .40 inel «Ammonium Oxalate, c. p. (ferric).. Baker Analyzed: vps a2 oun. . 80cb .08 lb. .30 inel «Ammonium Oxalate, c. p. (ferrous) Baker Analyzed Je eee SOC DROS Ylb. .25. inel «“ Ammonium Sulphate, c. p. (ferric) yeon Alum) eS Baker Analyzed 10 incl 50cb .08 Wylb. .20 inel EN RR Lo 8 001%) Typical Feros Sal oS ERS Analysts IRON Ammonium Sulphate (ferric) 5..-.-" Merck Blue Label .......... 60 incl Y{ lb. .25 _ inel Ferrous salt ...-........ less than 0. ee Fe” | giant | conn Coppextarns sists ecseeree es less than 0.01% Al vee Alkali fale ee eceironaede not more than 0.04% 28 Meee Rep eetiee arly UN aR Fi LN) airy iO lomads' bogrway Norms, Cea One Mee ASN a6 Maker or Brand IRON Ammonium Sulphate, c. p. eons) Baker Analyzed Felin one gram...... 2... sec eee 0.142-0.143 Cu Typical Analysis IRON Agaeiabans Sulphate (ferrous). nae Merck Blue Label Ferric salts............. less than 0.0008% Fe’’”’ Rectan cieiadaests less than 0.01% vA Guaranteed SSOSDOOSOOODS less than 0. 003% ( Analysis less than 0.0167% | IRON ATamionin Sulphate, c. P: (ferrous) (Phosphorous free).. ..... Baker Special “Ammonium Sulphate, c. Dp. (ferrous) large crystals, for standardizing. . Bert ts Bit ae OTOC a “Carbonate, c. p., moist (ferric)..... Baker Analyzed “Carbonate, c. p., moist (ferrous)... Baker Analyzed “Chloride, pure, lump Come )e: RTE Sesion eee “Chloride, c. p. (ferric).. .....-.. Baker Analyzed Ferrous Salt HCl =A Typical Analysis IRON Chloride, c. p. (ferric) @haashorus , ELEG) mtv shaysic eaere tists esate Baker Special “Chloride (ferric) Net vent SNE eS oe Merck Blue Label Basie Salt and other Substances difficultly soluble in Water Hydrochloric Acid (less than 0.35% Gate tel and Chlorine ...... f less than 0.001% PATONG ERP ety acl ees vcwce den less than 0. po11% Ferrous salt... ..less than 0.0025% Fe’’ \ Guaranteed DPE Tel cate se els weitle ayo sitters less than 0.005% / Analysis BAAN Chat teeters (ie pe: c avails leveiay eV alts less than 0.015% INIEICHA Cid sss <.-ta icles less than 0.025% as N2Os Alkali salts and @alGMM he wea Seas ele 'oje 5 not more than 0.0117% Sip hates sae sue caics cee less than 0.0025% as SOs. IRON Sas solution (ferric).. Merck Blue Label he same impurities as above. IRON, Chloride (ferric). . ee ie ee aah baum CfA Ee MCOHOTINE (LETTIG) |... oct martes shine acs Kahlbaum “C.f.A.”’ Free Hydrochloric Acid ..........none ‘ Bred Chlorine 2250 - vdsie. «x sds none MOLLOUS SALES ome cate ismecimien sels none Sulphate... . INS Graves eee csem ssn setacines wolctarce i Certified Alkalies and Calcium Oxide..... Analysis IRON Chloride, Cc. D: “(ferrous).. .... Baker Analyzed [Ee eee OOE CHEE C ODOC EE Cg COCOA “0.005% a Typical ae SEU iis ooeceinneaptonesdtoos pots present Analysis (Oxidizes readily in the air) IRON Chloride (fenrOUS) paces ere es Merck Blue Label Oxychloride .......... at most a small amount Sulphates........... less than 0.0075% as 0 (Cr) 0) 72) SRR NAOA OSE ac enna ar less than 0.03% \ Guaranteed VATE AD ne BOAO GIOIA less than 0. 0075% ’ Analysis AUKATISAIES S ./c/cejsicetase not more than 0.03% BROWIC einai town heals csc ck less than 0.0015% IRON Ferrocyanide, insoluble Bes ee Joosase> Doses esaIo AIG SS “Hydroxide, c. p., moist (ferric)..... Baker Analyzed “IRON shes Cup:; crystals (ferric) ..... Baker Analyzed 0 Typical TORSEHT ONG [seria hacene dabonGsatOne Seo pe aao anh trace Analysis TRON Nitrate ((erric) pacts > ages) sare ook Kahlbaum ‘‘C.f.A.” SO Ntrate | (EELIC) achat eeeiet: Sea. da Kahlbaum “‘C.f.A.” SHO ee aAconoe nde Gone ames -none < ae SpE ERIOA CAD AOD OO CUE IOIIE none | Aline 23. Ree ccs ea AES ne oO 7 in 10 \ Certified alee Be ae eee ays 19. 407 % grams/( Analysis Crystallized Ferric Nitrate.... 98.08% i \ Mbtnturese scenes nseans ole remainder 2 IRON Oxalate, c. p., crystals (ferric)..... Baker Analyzed peeOxalateyc: pi (ferrous), 2.4.0 te a Baker ‘Analyzed “Oxide, red (ferric), (Jewelers rouge for polishing purposes)...-- ..-.-- 22+ eens nee PRON Oxides caps (ferric) ioe. ook. eee oe Baker Analyzed sf pede. Cips; a Oxalate (ferric). Baker Special ... 0.005% | Typical . 0.001% § Analysis So: = 29 Ounce and pound prices Price in others size packages peroz, cont, 10 incl 10 incl 15 incl per Ib. cont. size pkg. 45 cb .08 V4 |b. -60 incl VY |b. RTC De OSU y 3:.. 26. “metal, free from silver. Sticks 6 inches Bissein ches eee seepage tee ae ae ia ans 9 ane: as) ene 30 incl *))) eee bi (PACE LALO COM ACEYSLSIN Smreieeni: oy oe ak een ree ne ene 20 cb\ .07 °$2 32.0 eee perc Acetate smurets. hcci rts ate ee te eee ee nce CaN e dl aan 25 ch (07 -...2: See LEAD peerates CSD: oe aap eee Baker Analyzed _—_............. -30 ch. .07 —2.....0Ru tne eee Setensnaigitie ni oela wearin toca te eae 0.0003% } e Retoninleiscis sane misicl-eha ican e ate 0.001% | Typical CaO ee rea bcins parame econ 0. met Analysis ING aires me engee mane ccc senceeen trace HEAD VAcetate sen) 22h, Oe Merck Blue Label .......... 50 incl 14 |b. .20 inel Earths and alkalies...... not more than 0.02% less than 0.001% less than 0. ae) Seen cor aainerninae meee less than 0.1% \ Guaranteed Lead Gases and sub- Analysis stances insoluble in Water...at most a trace Chlorides . ..... veo less than 0. 0005% as Cl Nitrates! estcece ccs less than 0.0032% as N20s 2 BEADUA Cetatent-c wt cs te emer nae Kah baumiGrr Ancaster nce oem ctenie ae ech 100 grm. .90 inel 30 Ave cin Hy UF R H. lp JE OP Mi AL OS @ 0)” (ME RT AY OND. Ounce and pound prices Price in other size packages Maker or Brand rien oz. cont. per Ib. at 2 size pkg. per pkg. cont. Foden Sse crate ae bcc eaten ahlpaume@ feAbin oo reer. acing DUO eDmeMesT on mannc) none none slight trace in 10 Certified MOBIC USsteimic scree eatneaeueayies 0.4 zie grams Analysis Cou wveemeeceenceceuccttverccess® none GD PErs sas cack Chee Saracen none LEAD Acetate, c. p., basic, solution, for sugar ‘analy. BIS Rae esr puere Maite CARA Td soca. ately les cP iat Oa a ea eas A oe oy ya ae a : EY paete panic, solution, sp. gr. 1.24 Merck Blue Label .......... AO ar Incl at Skat eek Pek obs cee yc Copper... less than 0.0006% ) Guaranteed LEAD Avstat te hea bree 0.0002% § Analysis cetate, c asic, dry, for sugar > analysis Masai serer ake ae ... Baker Analy zedah ) asta 1-1 50 cb .06 Ylb. .20 incl Fe ... 0.005% . 0.001% | Typical . 0.001% ( Analysis LEAD Aceiai iribasi pe 7 incl COLQUO NCD MULIDASICH Mah a sriccicic. (iscisivsdereateaiuecosate leas cae 7 IMCL AA st SPOUSE ars ese es Bie PAgsendte,lo. p. 38. atl..... 2... Baker Analyzed .20 incl 2.00cb .06 14lb. .65 incl - Hoxie, Ca Diack Feira ins alot ems lait: 29h siliy smal ae a Soap eae aMQhe a = ALDONALE MOLLE dic smyeoac fetes tee eee VARAC Os lniel islets esis, LANE ewocsve GOlicb > O9r ates Mea eeha sae LEAD Carbonate, Gs ayloteonségoosedees Baker Analyzed" ...:...... 50 cb .06 lb. .20 incl enone Wants ciara easier take Baker Analyzed ~§.......... 50 cb .06 V4 |b. .20 incl saSor Lotic 0.001% Re seer onal Typical ao - none ( Analysis Prim Eee erate lets ialeroicivleibisle)a)ealels\elsinicle)elsieyslaiy sie trace LEAD Uiromate; c a a DUES AG Oe ee Baker Analyzed © .......... cb .07 Y\b. .25 incl 0003% | ...-hone T. 1 208 Analy 0.002% oe. Per tdaliaececlatan e Mercke Blue dlabell, .y.... seul 20 incl Ylb. .40 inel G teed TS eta eo RPP MIU SCAR Desir srctaiti chats Siete cise hnioee cette Seine wierefamrouneany (AMIS fone 3.50 cb .07 14 lb. 1.00 incl SEN tLates UTC) CLYStals:© 245 Sacre ccc. ue Suds aslo Oegantons, Poem Neue ore CANS WAU essa sue: Manaesoouck ey ee ae CH Topp sasGeenpeap bic aaee Baker Analyzed ss... .... S2OCOe OO eRe ota aN er Too | Typical woe . 0.0 002% ( MaRE Bee Semen me peeccaccen neces ceue aise cialyiccic none. LEAD Oxalate, c. p. a Sg Goo, Tea ie BakervAnalyzedmi art» o> oe ecc we eb ie 44 lb. .35 incl een xides brown (MeadsPeroxide). .. fe. a: steele se a ael. one wos cee Col 04: ng Set aas BAe saya Ase SS ede; brown (Peroxide), c. p.. Sy Baker Analyzed gatmecnence 80 ch .06 Ylb. .25 incl Seeeonsee 93.6% Typical ae Ve Analysis Kestiaaciaitso Ss abddedans ateaeoonoce trace ““ Oxide, brown (Peroxide), c. p......_ Baker Special .......... 1.25 cb .06 V4 |b. .40 incl LEAD Oxide, brown, for ultimate analysis Merck Blue Label — .25 TT temeeesere ray: <- 1 lb. 1.20 incl Saas Sree paces less ee 0. oe ae } alles. .... no ore a Cesrantect Nitrates...........- less than 0.0032% as N20: TES Garbonatesresetesecm spe atices soetaciaretsice's none LEAD Oxide, brown, granulated, for use in , ’ elementary analysis............... Merck Bluemiabely -25 5 einclip a: sce oc 14g lb. 1.20 inel “Oxide (Orange Mineral) (Manga- geiunbet MEASLES) Mere erie cL ete nas hg ae Actin SA tue ORL Ser GS ZOE CD Ocmtas eerenbns © ae Sherrie LEAD Oxide, brown (Manganese free).... Merck Blue Label .25 imel .......... 16 lb. 1.20 _inel ShlOMdgsse eee cee less than 0.001% as ch Sulphates............ less than 0.0015% as 503| Substances soluble in water Guaranteed (Lead Nitrate, ete.)....... less than 0.0375% ( Analysis Calcium and alkalies... not more than 0. 5%, Manganese.................. less than 0.0002% LEAD Oxide (Red Lead).. bye Moysiarieratepiaeds AGaG CREME SIONS panna eees S A1Srecss OGR Wee ee ye Pee ss Oxide (Red Lead), ¢. D.. a fete € anger Baker Analyzed _—............... e220 cb 104 ence AMER EEA Be 0.005%, | Typical Janse sdodsos soecncpanocssodenondosaabaLe ETACO) (f Analysis data stelslatsteielin =inievei-in e) i nn ee Ett UddtIIEIddIsdSSSt SSS Maker or Brand LEAD Oxide, yellow. Ae aie hare ele es oe Merck Blue Label Substances insoluble i in Acetic Acid...............not more than 0.25% Carbonates. E tciteoaehs ...not more than 0.1% Copper net . less than 0.001% Trance ssieteeesinet ..less than 0.002% \, Guaranteed Aluminum less than 0.1% / Analysis Nitrates and nitrites ...less than 0. 016% as N20: Chlorides. . ..less than 0.002% as Cl Earths, Gy psum, and BLKBIICE Wet sicee sioise olive siererere not more than 0.3% LEAD Oxide (Litharge) ic scence ee Kahlbaum “C.f.A.”’ Oxide" (itharge) teccmsees cee Kahlbaum ‘‘C.f.A.”’ Carbon Rte ire cys .cisisinivieini<(olaisiayal dtetalalai ciate none > GB Orid esti -iaeiassivieisis sinjeleleielerelsleeeteinial=s trace Residue present after precipitating Lead (earths and Sens .12mg.\. In 10 \ Certified Alumina and Iron Oxide.. Oe .none / grams Analysis Copper.. Rngaceehe .none Nitrates and Hitrites. sc hohe eae none Solubility in Acetic Acid........ com plete LEAD Phosphate; c\ pester ce eee a Baker Analyzed Sane: (Oat SHESHR ECAR RAEN RAT nee Baker Analyzed ie . —0.001% 0.0003% Al Typical none f Analysis Roo none LEAD Bahia: CODE See etn et sare Baker Analyzed (SEM ATUPALE iC siDiciserasyer nies wore ete vay: Baker Analyzed LECITHIN, from efg8. lee. nace. ees) nese rgdovdsbECEDE LEVULOSE(Diabetin) iacccmetete ects es Schering °LIGROIN (See Ether Petroleum). LIME, Chlorinated, Cubes.. Active Chlorine. yields at least 25% by weight Merck Blue Label LIME WATER, tested reagent............ Merck Blue Label LITHARGE (See Lead Oxide, Yellow). LITHIUM: tmetal apuresvaenccrie-te cee tak ie cits shilere enue ss L MXN CECH Gono ntona See Monae OO OE ee occ LITHIUM SUNS CRD eet att or Baker Analyzed Y 960% at Typical Analysis LETHIUMsChioride;icape-nesss toes oo aces Baker Analyzed S20, Meee chet lebeleteeielciastoietataiels a0 ovens Typical AliOs ume pese errs 0.005%) Analysis PAT ACUM: Citrates came. snot. ot eter Baker Analyzed S us Nitrate, c. Ds NOR Airco itr oats Baker Analyzed SOas-ce-s.- Bene eset sci OL050% Gs Scene ieie ace bise einai .. 0.002% | Typical ATO gina. ntoneaanteeie Saieiecisiars seelO. 001% ( Analysis Claes acces ciceemitnece cuivecsen selene 0.015% LITHIUM Sulphate, c. p.. AOE ote Me noOT ep Onn s IEEE MUS eubess: pisses ree ce ardoavnty je ahshve Selaemer eure is DOW.GeU seer nessa mele ishcis s)5.e cede goleratereein aatcyarete eis MET MUS Bia ervaarce eis eres mae Merck Blue Label Tested for Sensitiveness LITMUS, Paper (See Test Paper). Pencils, each with one red and one blue point... Beet Se he Solution (Indicator) . are eee ten BA LITMUS Solution, according to Kubel and Tiemann in original packages... WKahlbaum Solution, according to Kubel and Tiemann in original packages... Kahlbaum « Milk (Lakmusmolke kiinstlich “ee nach Seitz)............... Kahlbaum “ Milk (Lakmusmolke kiinstlich nach Seitz).............. Kahlbaum LOGWOOD PExtractizpry cris eeirne eiecotie a i mersimctersia stra EV COR OD TUM ccc ce ti ey eee ee eee lel Aurea Reratae ID GIO) be Goose beet o bia Otome mao acec cere Lehn & Fink IMAGNESEDE Gea icscsennccorectan tee ae Merck Blue Label Loss on ignition......... about 50% *MAGNESIUM, metal apowdererannasetonice iene stad eateie oats Oise metal sribbonsss neers eee wae nee 2 ss metal, ROGEL AGES Ab go Sheded CHO UDG OBR owbe ADE 2 @ al, WiLre cer nase ate Palins neem sata s At MAGNESIUM Acetate, CAD See eae Baker Analyzed Aluminum Sulphate, c. p.. Ounce and pound prices Price in other size packages per oz. aunty per Ib. nae size pkg, per pkg. ants 20 TNC] perenne lb. .80 incl SEALE we hp ahs a BAe 100 grm. .95 incl , LA cae SRE S Se 500 grm. 2.90 _ inel FARR Ae on 1.35 cb .07 4 lb. .40 inel a Sates 50 cb.. .06. 5.4.00 eee Mbexagstociss 50 cb .06 Yb. .20 incl sta ees Sate 1.50 cb .07 lb. .45 incl 1.40 bel eae Yoz. 25 incl ee Se 1.60 ine] 2.00202 See Md SS Bets «35 incl 2... eee Bhs Srl ster AO incl ....04.. 00 eee ORT Cke E aeaoonart lgrm. 1.50 incl Bs eau 1:75'cb) 09» © cts: < Soe eee ee eee 00 Cb 09 VY lb. .65 incl 25 incl 2.50 cb .08 Ylb. .75 inel AAR sic 2.50 cb .08 Yylb. .75 inel 25 incl 2.50 cb .08 Yylb. .75 inel 25 incl 2.25cb .08 %lb. .70 inel ee ers 25 cc) 04 | coo eee cick Nae 40’ cc! 204. NE ae 40 Incl? Me ete set VY |b. 1.25 incl Meta Os ee Te each .20 RP Re Cio i 60 cb’ 08 92.0.) poe eee : EE eer 500 grm. 1.80 __ inel cae es EE 1 kilo 3.50 —_inel lisdoaacet ate eser 100 grm. .25 inel By Ok 500 grm. .75 — inel 30 incl } j.:.573.chieee eee 10 cb .03 1.20'¢b. .08 + ..5) eee eee Aes oe fe ACD AUS gal. 5.00 _—_inel SARA 40 incl lb. .20 inel 25 incl 2.60 nel oye. a. uo 45 ine] |... s oes. eye ateteea Se 30 Incl) i.e ne od eee 45 incl os a) cee ee Sees 90 cb .10 Yb. .35 mel au henson -65 cb .09 Yb. .25 incl ADE SRE OT BS Ue OR Hi. Ro JHeyO2y Mi Ava'S GT OM N Ne MAGNESIUM MAGNESIUM MAGN ESIUM MAGNESIUM MAGNESIUM MAGNESIUM MAGNESIUM MAGNESIUM MAGNESIUM MAGNESIUM Ounte and pound prices Price in other size packages Maker or Brand _ oz. cont. perlb, cont. ea Chloride, c. Ae Baker Analyzed _.............. 35 cb .08 an Hats al Typical none ( Analysis 0.001% esa Merck Blue Label .......... .80 incl Sulphates... . less than 0.01% as SOs) Heavy TELS eRe kee aE none i less than 0.005% | Guaranteed less than 0.002% ( Analysis ieee % as POs Arsenates...... less than 0. 005% : as AsoOs Ammonium Phosphate,c.p. Baker Analyzed _................. 1.00 cb .08 Ammonium Sulphate, c. p. Baker Analyzed _................ 35 cb .08 BDLALOH ON Doss cioeia eo eens ccioes Telia Gi) i hen Dinas aie IBFOMICe ep utaiet es ol oo aen ae DOMPUN LOCL sce caters Carbonate, pure, powder... .............. Sie eee aE. one 20 CC .05 Cocbonete, fb 18 2 basic .. Baker Analy zedinva sae were Sons 90 cb .10 —0. 001% Typical ial Analysis Seer artes Merck Blue Tabeleer etd. se. OO incl Substances soluble in Water...not more than 0.75% Sulghatess seo aceactemens) less than 0.0125% % as =m) iene azsolubiest in ae epaicere ee x 7 none orides - ess than as Barium. . less than 0. 015% > Guaranteed (QEUTSIRT TIT ok ante erga less than 0.06% { ~ ¥ PAN EVAN oe cece oie eatolcicieeroe Suellen less than 0.6% PT eniry motels na c-fierccisec ne nc ao tins nattone none Ohiloride; pure crystals: cages oe nose tcita teal eo 3 ee 25cb .10 Chloride: Cape, crystals. . Baker Analyzed .......... 30 cb .09 103 ote Typical 0. 005% ¢ Analysis PICLY Sbaliss seen fe Merck Blue Label .......... 1.00 incl Substances insoluble in Aleohol..... none | Sulphates.......... less than 0.01% as SOz Phosphates......less than 0.0016% as P20s Arsenates........ less than 0.05% as AsoOs \ Guaranteed Ammonium salts. less than 0. 0011% as | Analysis Barium. .... less than 0.002% eR VITNeLAIS <= - atcee cena con Bie oece none Calcium..... less than 0.005% Chloride, crystals......... Kahl barns haan cece sor anne pee ee Chloride, crystals......... Kshibatimr Cian. mates ctor mneciata se fore, x Calcium Oxide and Baryta...none, Heavy oe SSAD OEE GCES none | | Ammonium salts.........-... none ce In 10 Certified Dulphatesie.cs . sedescasee prams Analysis Phosphate. . AnsenAless et cc 2a acineeaes Insoluble in Alcohol.......... none Chloride, c. p., fused, lump PATTON HET EE) Mets aie is Byore.s'e se’ oye, oleh by Sects 70 cb .08 Chloride, c. p., sticks (Am- ANOMIASETEE) ioe) CARL eee oe aes Ri Se 80 cb .08 INTRA Lesh Diet tee ol Baker Analyzed 10 incl .50cb .09 INTERALes Cy De LUSCU Ss nyt vn einai te clare 15 incl .90cb .09 Oxalate; esp sccemeap cue. 6 Baker Analyzed) sa. ..22-- 1.25 cb .09 Oxidemlicht powder... hie eee soto irs ae aici ofan s 2 60 inel Oxidemhenvy npOWwGerr aul oe oe ae ns ce ees Matic c/s 65 incl OSs (C5 Nan cae arete seo Baker: Analyzed) — 2).o0-a-e- 1.00 cb .12 ace Ae Merck Blue Label .......... 1.00 inel Substances soluble i in water. -not more than 0.75% Substances insoluble in Hydrochloric Acid..... none Dilphintescescesasc see citecice less than 0.375% as SOz (Chlorideasisscescee maces ces -coe less than 0.01% as Cl @arbonatessoos isc: ceces ewes oe less than 4% as COs \, Guaranteed Nitrogen.. not more than 0.0056% / Analysis Barium... less than 0.02% ess than 0.01% Zo less than 0. 025%, Baker Special .......... 1.50 cb .12 size pkg. \% lb. V4 |b. VY lb. 100 grm. per pkg. 15 -30 65 500 grm. 1.60 SS = > V4 lb. 45 cont. incl inel incl incl incl incl inel inel A R tT H U KR OH.» © O M At S fc 5 00ns00uEn=C—n <4 Ounce and pound prices Price in other size packages TOOC—SM OO ——mDO)OWn Maker or Brand peroz. cont. perlb, cont. size pkg. perpkg. cont = MAGNESIUM Oxide, free from Sulphates Merck Blue Label .30 imel .......... Yylb. .90 inel Substances soluble in Water....not more than 0.75% A Substances insoluble in Hydrochloric Acid..... none Chlorides 35.0.2 os semceenenenee less than 0.01% as Cl Carbonsites te con eeacecoct acct less than 4% CO: . not more than 0.0056% \, Guaranteed . less than 0.02% / Analysis Heyy ma Ue ang schdnct sete ascot pasar yecees none Eronissenseeee ...-less than 0.025% Silighaies enseeeeaeeceinseeaen “Jess than 0. 016% as SOs MAGNESIUM Oxide and Sodium Carbon- ate, c. p. (Eschka’s Mix- cre) 2 SE ee eee Baker Analyzed —...---...2: 1.00 cb .10 Ylb. .35 MAGNESIUM Phohats: @o 12 canes Baker Analyzed _—.............. -85 cb .08 Yb. .30 Pyrophosphates.c™ pote... 2) acest. oo PRC U75icb. O08, Leseeee cake G Sulphate, pure, crystals (Epsom Salts)-c2.50ccees ome teh cw ss Ghee tore 10ic0 05" aocee eee cae MAGNESIUM pani ate, CAD Sisco eee Baker Analyzed _............. 20 cb. .08eisseeseee fois 23 Typical ims %, Analysis Merck Blue Label .......... 50 incl Y%lb. .20 Chlorides less than 0.0005% as Cl . less than 0. 0016% as P2O0s5 eee less than 0.05% as AsoOs\ Guaranteed none / Analysis -less than aco008e, ( senic. . -less than 0.0015%, : ; MAGNESIUM Sulphate................... Kahlbaum 'C.f-A\2? 15. 2 ees oe ee 500 grm. .85 — inel “none | | ie -.none\ In 10 Certified bane ace ies onso sees nae none( grams Analysis ewe ee esccncce none um (flame reaction) ...none. ] ax MAGNESIUM Sulphate: Cc. p., anhydrous See eect Pass ce elec le etre Wd o To ESOS 45 cb .08 Ylb. .20— WartratesG@p. <5... 255s oe Baker Analyzed ...-....:. 2.00cb 0S Mlb. 65 | MALELINE: (DidstasefofiMalt)inc snc. cca) sae eee eee eee <65' cb ° (03 °=. 22s... ee MALTOSE Dac eae eins oe OE seek Late oe ere eee es 60icb» 03553.. 4... 22 on cee Bee arta ncieer see tale etalaee si OTS Kahlbaum ir eRhSks. bast ate San LOIRE MANGANESE, metals scout, 9405-2 oes eae ne see ee 20\cb- 03... 5. San DUTE CUS CIE en cerns a na eee eee oe 30 ch” 03" $2) 2e- 03 eee ae “e ‘Acetatemcn pe. cases =~ Baker Analyzedie 4 oeeaee 1.00 cb .08 yy lb. (35a ss BSOLALC SGD ssc ssine soe Aono m OO eae SEE ee ate ae eee cae 2SD°CD) cLUN eee ayefie MANGANESE EOS C: P os Ase ee so Baker Analyzed ............. -70 cb .10 Mlb. .24 Manganic Carbonate... trace | ae: MANGANESE Chloride; Cap wer ne he Baker Analyzed ...:.....- 40 cb .08 Yyqlb. .20 im oe Typical Analysis ’ Merck Blue Label .......... 50 incl Wylb. .20 se ner cece ach: Cee less than 0.01% as SO; (@hiloring 270-92 -6) <<. < less than 0.0023% as Cl (Galera fos oe ee oes. 2 less than ia . less than 0.0008% \. Guaranteed Other foreign metals...............2..2.00005 none / Analysis Salts of Maenestmny: and a the alkalies. . ey .not more than 0.033% Zine less than 0.2% iaaivisain UC PAU S aac. Soe eee 100 grm. .50 Ss In 10 had Other heavy metals....... Sa Bae \ Analysis Alkalies presen pier prscipiesting.- Manganese... 113.2 mg. ; MANGANESE Dioxide, native, ‘granular... ee se oe, eee 10 cc .04 pean oceanside Case) Mysarmertorts Wore bee OSperketaes ake ace secrete “Cedar, for use as a clearing agent in MUCHOS COD Verne ae it Gicieinic/eiGkyheeittecTorenl Wehyete tachi. 90 chi OSs eta ec tee “Cedar, Special, for use as clearing agent in microscopy, guaran- 5 teed to mix with alcohol in all Broportigns without cloudi- FEE cota sage RRM SAREE TIS ANITA BERD Oe EOD OLip ee C.O ICI CRESS Hea clone) crt mom nonr ee enooC SEOs “Cedar, eo for Immersion Ob- JGeilvesarenn accra ecules clelet cielne stein sieseleis eoalebe 20S SOIC DOS mean ect Mc lac sani “Cedar, Special for Immersion Ob- 2 \4 oa eG HECUEY Cha Perth SCO ON Soke) asi deh cbs VCC NMED RO RAT n) LBRO ODN ib CORE eG no B0Z. -» inc | SU CIOVES mi wicerrecbifiedscntcscea cite sare) Ghiswtisi@eieid steluintereietess RFD) ISO Glee. (3h Secomeee: poocOorObe nT Ty =H) O27, [Mi Ase Cc FA 1) a Re 9 (RO) H. Oo M Ph An Nise okt ——— ee enn eee ov OO om OIL Cottonseed:.. 2.5 65.2.5: Sort TANSCOG DAW o.oo ae ee oP. ADANSCOU DOLE nana ata ee ee “ Mirbane (See Nitrobenzole)......... ‘Olive, Lucea Gream..<. 0225... te. -* ‘©* /Origanum, Creticumic. «acc. ss sees se <> Paraftine; white, pulenss- =e Sa SPOVIN cocoate vee See ee “Turpentine (See Turpentine)........ ORGIN, (pure crystals scence eee ccna ee ORPIMENT, (See Arsenic Sulphide)....... ORTOLK SA. fee aan cae OXGALL, neutral, freshly precipitated for bacteriological use............. *“OXONE,” for generating Oxygen........ °OXYGEN, gas, 99% pure, as used in cal- orimetry, carbon combustions in steel, etc. Guaranteed to be free from the Oxides of Car- bon, Hydrocarbons, Chlorine and other deleterious sub- stances. Furnished in seam- less steel cylinders. Made in accordance with the require- ments of the Interstate Com- merce Commission. The price includes one cylinder, con- taining 70 cu. ft. at 1800 lbs. pressure at 68° F. These cyl- inders are returnable for re- tillage only cprie sere ee Sele rs “OXYGEN, gas, 97%, at 1000 lbs. pressure sf gas, 97%, at 1000 lbs. pressure «s gas cylinder connections..... These cylinders returnable for credit or refilling. OZOKERITE, black-2te se eeneee ss sace se: PALLADIUM, sheets or wire.............. Copper and Iron.............. none BATE ADIUMs: bl sickcs: cationic tale cenioe s Dlackis.e Werte taints chee Copper and Fron..:..........- none PALLADIUM Chloride, tested reagent... a Chloride, tested reagent... i se Nitrate, tested reagent... .. - ff Nitrate, tested reagent..... iB Sodium Chloride, tested re- Pyaar eRe tc oa ono eeaaaneee Sodium Chloride, tested re- Ura eee ec ae Un boys eee Ee BAT MCOUSSoRp erste ceeet ae ce neeeas 5 PANCREATING active vcairee doce eee PAPER, (See Test Paper)...............- PARAFFINE, domestic, melting point AbHOUtASSO Taek tases es domestic, melting point about 52°C.. By og ners (For imported _ ’ Paraffine melting at other tempera- tures, see Imbedding Media.) PARA-AMIDO-ACETOPHENON .......... PARA-DIMETHYL-AMIDO-BENZALDE- HYDE for Phriich’s test............ PARA- PHENYLENEDI AMINE, pure eryst. Hydrochloride... SPARALD EE VDE saeco tee awe oe PARCHMENT Paper, thin. . Ties tek Paper, medium... Paper, heavy Maker or Brand Merck Blue Label Merck Blue Label Merck Blue Label Merck Blue Label Merck Blue Label Merck Blue Label Merck Blue Label Ounce and pound prices Price in other size packages peroz. cont. per lb. cont, os Sree 15 cb .08 Bee oe ee -20 cb .08 Peal 20 cb .08 ebaee Woee 60 cb .08 30 cb .03. 4.00 cb .08 ee Se. -20 cb_ .08 Perea one -20 cb .08 RTD" 2inel Wasack cer eee 25 incl 60 = incl... :1sha BA SASS At: 15 incl ear aee “15 incl 4:50(cb. 03). 2 cate ‘S0teb ROL Nn ene [00 Nehee 05) en ae Bs Gare 75 cb .09 Be ere 40 incl seeps 40 inel Sa et ete 40 incl size pkg. per pkg. ont. lgal. 3.50 — inel lerm. .15 inel 16 lb. 2.25 _inel e q 2Ib. 1.50 —_inel ; 17.80, 52.ehoe inel 40 gal. 2.25 cyl. 6.00 100 gal. 5.00 cyl. 12.00 2 shiseets 1.75 ‘Ter. 230 inel 5 er. 1.50 inel 15 gr. 4.25 incl 5egr. 1.10 ine! 15 gr. 3.00 incl 5 gr. =.8hn eae) 15 gr. 2.25 incl 5 gr. 65) spel 15 gr. 1.75 inel cake .10 inel 10 grm. 1.00 inel etme eee ns 0 0s cele s Sieis TN aol 8 ses we) ie ae 3 U R ies by HK 1 See betel ican gollen, Wile seshdoee Bogonosean eS Bromide; CMD sheen caterers Baker Analyzed .......... 30 cb: -O/Mmenealb. 25. incl jical * Analysis POTASSIUM Bromide:.. 2.02... joc 6.c5 os Merck Blue Label .......... 1.00 incl VYlb. 35 inel Potassium Carbonate....less than 0.04% eesti Eroniate 5 sfc less than 0. ae 2 Sulphates ......leas than 0.001959 as SO: \ Guaranteed Barium salts........ less than 0.002% Ba / Analysis Wodides yeh. success ene less than 0. AGI Excess of Potassium \ Chloride.......... not more than 1.3% POTASSIUM Carbonate (Pearl Ash) 90% ..... afotictctextie tusk ove scriméogone oO UE ccoke cones poration ho sh Carbonate, pure, powder... ........+seeeeseee eis LSC USuacceiet sista.” alsveisiecemewle Fy aU aR: Elis Toe VOR Ma Ages €) JO 7 eM AR a= Asn A Re, fel Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb, cont. ; size pkg. per pkg. cont. Baker Analyzedin') ....0. an 25 cb .08 Ylb. 15 inel ATOu 0. Ee ‘ SiOs 5 0.003% \ Typical CaO . —0.001% ( Analysis Ci --- 0.002% SO; . —0.001% J y POTASSIUM Carbonate... Merck Blue Label .......... -80 incl Ywlb. .380 inel HV eav-yoraetalaicmcten clade reese rears none Chlorides..... less than 0. 002% as Cl Sulphates. .. Jess than 0, 0075% as SOs 1 Nitrates .... less than 0.08% as N205 Potassium Cyanide ....less than 0.048%C0N Sulphidestmeseecnsneiece less than 0.02%S \ Guaranteed \ Sulphites........... less than 0.008% as SO2 / Analysis Thiosulphates....less than 0.08% as K2S202 Phosphates........ less than 0.004% as P2Os Dillcateg veneer cesedsmmectinecer sem emaciie none onan idiinscauanbeccnn: hes) Basar (CAI a RaSh copeadaeo- on ess than 0. %, POTASSIUM Carbonate.................. Kahl baum {:@.fsAc) 2 ce 5 eee 100 grm. .60 — inel a Carbonate s.).5, cen. soos Kathi batim <'OsfsAmen in rscer cn etic atnce 500 grm. 1.30 _inel Content K2COs.... 97.15% HOR an 2.88% 100.03% Chloride wenscieer slight trace Sulphate: -aecorcese cae none Phosphate.............- none Dilleaternntusereriscteee none, in 10 \Certified Nitrate...... -none/ grams /Analysis Alkaline earths none Cyanide. .none Aluminal esse cece cn none Sulphite, Sulphide and Sruniose chats Wennseelels none 7 eavy metals..... .... none q POTASSIUM Carbonate, c. p., anhydrous Baker Analyzed elolerelefoieraletoant-4 UCD ge OS 4% lb. .18 inel Fe 0.0003% a “ysese | pore BU) Typical es me : 7 aig Ana 3 0; 701 . . POTASSIUM Carbonate, c. p., anhydrous Baker Special —.......... -60 cb .08 Ylb. .22 —inel (LOK enamparidorocooddsc aco o0u5 0.001% POTASSIUM Carbonate, solution, about 2 : CBAs ABE hays Merck Blue Label .......... 65 incl Ylb. .25 inel Tested for the same substances a) Potassium Carbonate (using 3 ec. { Guaranteed solution instead of 1 gram Potas- ( Analysis sium Carbonate) SPOTASSIUMsChloratewerystalss.casccee eee ee ecee en eee eee -15 ce a at ao 52 | 2 es Ghiloraten powdery vrais eamce eee accent ew Ccterar Te Ree eA5ice: .:04 1065/45. Wee eee he } 2 s Chlorate, c.p.,smallecrystals Baker Analyzed ............ -35 cb .08 Ylb. .20 incl 4 e se Chlorate, c. p., large crystals Baker Analyzed ................ 40 cb .08 Yq lb. .20 inel : a Civorate, c. p., powder. fae BakerzAnaly.zedmmnrie ence 40 cb .08 4 Ib. .20 incl 0.0002% A mona Typical 0. 001% ae 0.001% °POTASSIUM Chlorate..................- Merck Blue Label .......... 50 inel Ylb. .20 incl Chlorides... .less than 0.001% as Cl eey metals....... souuhence “a mene ACLU ee tee isis less than 0.0059 Bromates .. less than 0.08% as Bris Gasrantert Nitrates..less than 0.0016% as N2Os y Sulphates.. .less Yias Casio Os “AYSeniC os. s less than 0.00005% SPOTASSIUMEChIloratete eee eee oe : Mahl baum “CiicAn eee ae eee reee 500 grm. .85 — inel ° ce Chlorate 3. 2 eo Tah barnes: © heARe on a eee 1000 grm. 1.35 inel ATHONICH ese e sae acintees none Sulphate Son none | | 4 Nitrate Sseeyeteenteat none! in 10 \ Certified Chloride..... .none( grams, Analysis Heavy metals. ‘none | \ Chine earths. . -none } 18 04 POTASSIUMEChIoridespure scence) stieieye cise eer Be ve 18 cc. (04; . ..:n/¢e.ce eee cs Chloride, c. p Baker Analyzed ieee ee | 2b cbEe OS! Ylb. .15 incl Fe CaO Al Na.. Acelvais M20. cae POTASSIUM Chloride.................... Merck Blue Label .......... 60 incl Wb. .25 inel Heavy metals......... . none Alkaline f ; f ( earths...... less than 0.01% as Ca Guaranteed Sulphates. less than 0.001% as SO; é Nitrates.less than 0.0032% as N2O3 Analysis Chlorates.less than 0.018%#as Cle! Os Magnesium........less hen 0.002% Aiea kt el: OR Ie. Ti EI (OD) 2M ATS GOS MP aiPT Aner Ni ry Ounce and pound prices Price in other size ) pac kages Maker or Brand peroz. cont. per ib. cont: size Alita per “pke. cont, POTASSIUM Chloride................... Kahl barim'CisAn. - 5 2c ec wats ecan sine 500 erm. .90 incl . none Heavy metals... . none \ in 10 { Certified Alkaline earths Sulphate Saceass Le grams ( Analysis pntent esse ccs ceae ) POTASSIUM Chloride, c. p. (Sodium free)... Baker Speciali@ulees ianveras . .50cb .08 Ylb. .20 inel Chromate, OO ea, Sn aeReeAn ESE AST cant: SAE an Gora .30 8 io BT ae sata reseoe S hromate;meutrall) pures 09 Le Ss veh ogee anid Uist toes ~ooN CD i soosseca “E eee POTASSIUM SG CHP eee selon ces » BakerpAnalyzediay pemara-- 50 cb .07 Y%lb. .20 inel POTASSIUM ¢ REE a NE 1.00 incl Ylb. .35 inel Free alkali ..less than 0.2% as KOH Sulphates ...less than 0.029% as SOs Chlorides. ...less than 0. 0025% as Cl\ Guaranteed Alumina........ less than 0.1% as Alj Analysis Alkaline ; Peer anee ob ( BEsaniNGhomsich:. 0.5... Kahlbatim, HOP Aste ee ee! Terms 75) ane! rf Chromatets eer Ausekecne Kahl baum CiivAs ve ans thaw tones eee 500 grm. 1.95 incl Free alkali... none Sulphate. sone aoe | oriae .none in Cc ifi d a ee ea | ces Content. ses. 5. 98.88% POTASSIUM Citrate, granular...” 65 ce .04 WiNALeS CLAD ULAT Se ete crctcicts, ) Seleie crores slavcie aiare eae Rea EE | ree Reon lc 50 grm. .90 incl & Cyanidetaas.. ae eres 4: Kahl baum *‘@ifvaAl? seul pris ves ari ae E 100 grm. 1.45 inel es ees ecm eels none ) oe adel in 10 ( Certified ..none/ grams/ Analysis . “none| \ Content. sceccress =e 99. 74% ) POTASSIUM Dichromate (See piebromate) Herieyanides coms /crysts on tcc. em oe tes on ed eee TADLOC PR OE Pre rertey cia Gee eerste Y METKICVANIGE) PUTCM ree e-) slsielate = = c= s,c\eselp cist yet etna © sits ROOKCD) a OSG rte tie stae eae POTASSIUM Ferricyanide, CaDh eaten ae Baker Analyzed _............. 1.00 cb .08 Ylb. .35 incl p LA Ser aeeoa tients tate owen « trace) pynical Serene a Analysis POTASSIUM Ferricyanide............... Merck Blue Label .......... 1.60 incl lb. .50 incl F eas not more than 0.056% Fe” t Guaranteed Sulphates. . lees, uae 0. 005% a8 soit Analysis Ch orides...... ess an as POTASSIUM Ferricyanide.......... vce Rab barina GOA RAI Me! Geb 8.8 100 grm. .95 inel Holphate-seaseaseeen none i Ferrous salts........... fonck in 10 ( Certified Chloride.......... faint ral grams ( Analysis Goritent-=. 25.25% 2c: 99.6 POTASSIUM Ferrocyanide, vollawe CO ai ee earn © Bcc Oem ccge che ONCOL Ae eo ereloaralerarerae Ferrocyanide, pure, powder, aie in ' AMY CPOUS er Mss. ew ciecaiy syeuse Netra istee Gctafalet koa « -60 cb .08 Ylb. .22 ine POTASSIUM Ferrocyanide, c. p.......... Baker Analyzed _.............. 60 cb .08 Ylb. .22 incl Deets arirser tants ocacare 0.001% ) op ; emmennmer Analysis 45 AS eR > Hee ORs H Ty’. “Hol One MineAg= ss C(O) Mig PRE Aye Names Ounce and pound prices Price in other size packages Maker or Brand per oz. cont, perlb. cont. ee pkg. per pkg. cont. POTASSIUM Ferrocyanide Teen ee sees Merck Blue Label ..... ApGodmcle heal Y%lb. .380 inel Carbonates. ..less than 0.75% as COz Guaranteed Sulphates.. less than 0.0075% as SOs re ais A Chlorides....... less than 0. 01% Jo a8 Cl) ~ y POTASSIUM FRerrocyanide;. <0. ...-2:s KahlbaumsC.fAl? i acne ctelamumen ona ster 100 grm. .65 incl Rerrocyanide:: 9s... 2. os... Kahlbaums!@ fA a7". feat eee ie ee 500 grm. 1.50 incl Sulphate: tlh sneer aseiccse= none Chloride... | | Carbonatese oencmtes ones none‘ in 10 \ Certified Content, calculated to grams, Analysis 3 molecules water of ( \ erystallization........ 100.45% } POT ASSIUM Fluoride icsps- nee sen Baker Analyzed © -°.../..:... 1.25 cb .09 Ylb. .40 inel Formate sen psscsioo eres BakexAmalyzed) J jac8-. se. 2.00 cb .08 Ylb. .65 inel oo Hydroxide, coml., powder ; bee (Caistic Potash) Sete tere reece ane Gee iil 15 incl 10 lb. 1.00 incl G Hydroxide, electrolytic, sticks .....-.-...-.005.- 0 sees e ene 35 cb .08 Ylb. .18 inel POTASSIUM Hydroxide, purified......... Merck Blue Label .......... 45 incl Ylb. .20 inel Nitrates. ..less than 0.0016% as N20s) Aluminum ........... less than 0.1% Calcium....... less than 0.1% \ Guaranteed Heavy metals at most a trace/ Analysis Potassium \ Carbonate one not more than 5%/ : POTASSIUM Hydroxide, purest.......... Merck Blue Label _ .20 inel scree es 16 lb. .80 inel Sulphate ............ less than 0.004% as SOs Chlorides. . ....less than 0.0025% as Cl Nitrates ......... less than 0. 0016% as N20s5 Nitrogen as nitrates; nitrites and Ammonia . -less than 0.00112% N Nitrites S75. 5 seer Jess than 0. 00011% N2Os Phosphates. . ... less than 0.004% as P2O; Guaranteed Silicates ..... ..not more than 0.02% SiO2, Analysis Alumina) 2s cnacicc se not over 0.0106% as Al| Galeinintie cece scetecainers less than 0.012% Heavyumetals: 5-0 acces nec caus none Substances insoluble in Alcohol........ none Potassium eee Carbonate..........- not more than 2.76% POTASSIUM@Hydroxide, cep byzal Coho lem ce yeteieciniicieiere wi cloy ~/ecieyeparey -60 cb _-08 Ylb. .22 incl POTASSIUM Hydroxide, purified by aleohol Merck Blue Tiabel stoners 70 inel Ylb. .25 inel Sulphates..<.. 00... csc. sense less than 0.004% as SOs Nitra tea teccee seminar cae less than 0.0016% as N20s Nitrogen, as nitrates, nitrites, and Ammonia, etc............- less than 0.00112% N Chlorides asa oeeenerans sexiene less than 0.005% as Cl \ Guaranteed Silicates. . ..not more than 0.06% as SiOz / Analysis WT arninakeet Myer eta sae not more than 0.032% (ORM Ao sonncacdoouadasoossnbonebon less than 0.04% Heavysumetalasescrscactee sr miusenicncle: at most a trace Potassium Carbonate............ not more than 4.15%, POTASSIUM Hydroxide, solution, all Strength swscanh i. es eee a: Merck Blue Label .......... 250 nel Pease) dines Tested for the same substances as under Potassium Hydroxide Pure, but using 2 cc. of solution sp. gr. 1.3, or 5 cc. of solution sp. gr. 1.138 instead of 1 gram Potassium Hydroxide cape : POTASSIUM Hydroxide; pure (by. baryite) oars oe wate hte) ne rere pate ie [ofatavayntetc . 2.50 incl “Lg o.02 6 De eee Todate.c pests het: Siete one sieieaiweinns 55) incl” en eee . a eee Ke lodate es ete sot ae Merck Blue Label .65 incl BASES yy oz. 25 inel Free acids.. ..-less than 0.07% as HIOs Guaranteed Todidesv-sssecce sce less chan 0 0015% I iralveis Chlorates. less than 0.15% as Clz0s va : POTASSIUM LOGIC ES GEIS sos oaseeso eousodecoondeacne sSeriseniejt Ss COLO DI iS aieieiseetete Bro 5 Baker Analyzed 40 ~=incl 4.00 cb .06 nd Ib. 1.25 inel none| Typical °\ Analysis Merck Blue Label .40 incl 5.00 incl Yb. 1.85 __inel otassium Carbonate .-less than 0. wee SAV VM etala ian casa cre en ttcntseccaciens tr senie Sulphates -less than 0.01% as 80s . Cynnidess. ss. Sees cnce ce recines less than 0. 03% CN \, Guaranteed odates .less than 0.001% as 1:05 / Analysis Werricjsalts’. <.)sjacis'eetel< ne'er less than 0: 005% Fe’”’ AeCeUST -less than 0.0016% as N20s Excess of Potassium Chloride........ at most 0.5% 3 : a 4 i POTASSIUM Iodide, neutral............. Merck Blue Label .45 incl 5.50 _ incl Y% lb. 1.50 inel Neutrality. ..... less than 0.003% alkali as KOH Potassium Carbonate............ less than 0. 08% Heavy metals........ Sulphates.... less than 0.01% as SOs Gyanidesie). aeons less than 0.03% CN \ Guaranteed Todates. ... ..-less than 0.001% as 0s y Ferric salts.............. less than 0.005% as Fe” Nitrates sceeeeescnene less than 0.0016% as N2Os Excess of Potassium Chloride...... at most 0.5% 44 (Aner: fel: ME. 20) KR Else. Cla Oe Me AW eS CO) MG Res aN ~< Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb. cont. size pkg. per pkg. cont. POTASSIUM, Todide, ic: pi. ::.¢25.... 22... Baker Special 50 incl 5.00 cb .06 Yj lb. 1.55 incl a Molybdate psccs ccc. sce tins crate oe 45 BG bk cea ate Ee Tice oO oi oe 3 es Nitrate, Sine area ey RAGE Si sy Sheed Tian oo GRE 20) CORE OF Rr eye Nai Siem aterenes 2 ce Nitrate ppure icrystalseem seh mrme mace dace ne uence kien PAU (Le ech UY bev 2 Sa ae ren NenBERE ae ‘POTASSIUM Nitrate c. p., crystals. ..... Baker Analyzed .......... 30 cb .08 Y{lb. .18 incl ee: Caupss Baa rae Baker Analyzed .......... 35 cb .08 Mlb. .18 _ incl ; none = none” Anas trace EONS SAUL Matai late nnaasterais a teas Merck Blue Label .......... 80 incl lf lb. .30 incl aa os ca ote ttesarnicreaicn xs less than 0.0025% as SOs BO Men cosa en tie Oar ns = npn aes sil ESSE Zo a8 Cl2Os\ Guaranteed less than 0. 01% ( Analysis less than 600080, Nitrites.... s than 0.00055% as N2Os LOMAS SUOMLINETALC. occ cc cu eaicle cae siec Kahlpauiie CstiAce mete eins nkelanes os 100 grm. .60 incl . ef INDRALe Renee ice one Kah baum) SCrisAe beret o> Gneewncas 500 grm. 1.50 incl Alkaline earths....... none Heavy metals........ none | | Sulphate... : . In 10 \ Certified Chloride. grams Analysis Chlorate. \ ( Nitrite.. / “POTASSIUM Nitrate, c. p., fused Sree cneeyN Scisisis ote cote i of AEN FIL cen 55 cb .08 lb. .20 inel POTASSIUM Nitrite, c. p., crystals...... Baker Analyzed 15 incl .80cb .08 lb. .40 incl s ats CoprsSticks: ja... _ Baker Analyzed 15 inel 1.15 cb .08 4 |b. .40 incl] . Typical Analysis Merck Blue Label .......... 1.50 incl Yylb. .50 inc) Is = Guaranteed Chl q Drs canyoet less than 0.002' (0) Sapa See sss SO POTASSIUM Oxalateynedtnal Penystalsin. » Satie or vende fess than 0:30 Pb ( pons Substances not precipitated by Hydrochloric Acid................. less than 0.025% SILVER Nitrate; wpurensticks nee eascic oe erctaermer cence Och 04) .2s%i ake eeadted. a eee "SILVER Nitrateyistickss cee ce eee ea Merck Blue Label 1:00; incl’ ~-sitieeeteeiceren arate Chlorides............ -less than 0.002% as Cl eee Nitrate co des ian 2 80 0 ne Sond es . less an u Salts of Bie ath Rilces than 0. 02% Bi auaranieed Baltaiof Leadi'csutheubetta vcs: less than 0.3% a y Impurities not precipitated by Hydrochloric Acid................. less than 0.025% SILVERSNitritescompoe core ace Gee aero einer: eine 1.35) cinel! “Coase teeter sietele/ sitet SITVERANitrites sen ee secre acre eerie Merck Blue Label 2.50 incl .......... woz. . incl Substances not precipitated by Hydrochloric Acid................. less than 0.025% SIUVERESulphate; ic spteeee teen scche sheen eee acter LO!) incl eesrcmes Sos BS09SeE oo: Geto SOAP Castilebara rere cem cnet: sce e Caren cite Reishee ntomno his: fpse 25 InCly) ee | eee re Let 0) Dooo baat ccc otic GOeriCemmErics cori otter Meee aad ohh HO OES oa0 cake .10 incl SODA ASH (See Sodium Carbonate) SODA LIME (See Sodium Calcium Hy- droxide) *SODIUM, METAL ATLOKS Vert cicetee erinteversie ists iene oinieneisin evotevensan stasis 25 incl .90 In¢] ote SODIUM Borate (Borax) purest, crystals. Merck Blue Label .......... 45 incl V4 |b. - .20 Proper Water content... é 47.1% amounts Ie coda ae ‘Tess Paes as GOs | ulphates. ess than 79% as SOs\ G teed aoe es ee Analisis Irons ...-less than 0.0008% Otherimetals: Sees cee ec sees cee eos none SODIUM Borate, crystals................- Isa bat @ haa See ee ere nce) Cree ee 100 grm. .55 He Borate, cee Sadana Tena Kahl bam :t @stvAn acs on | eee 500 grm. 1.00 Residue on denibion . 52.87% . on Sate. Petes zonel | WAS) none\ In 10 | Certified Sees ea =| grams (Analysis Heavy metals........... Content found.. . -100.08% SODIUM Borate (Borax), pure, POWER | © aeckacicds..aeeieh ten Pen ee p 15.ce. ::04)ms. cee eee fe Ue Caps spOW.Uelamer clei d Baker Analyzed’) ese... A0 ch .08 Y% lb. 17 Typical ve Ree SODIUM Borate (Borax), calcined, purest Merck Blue Label .......... 1.00 incl Ylb. .35 Proper Water content. .not more than 25%. carbonates sae es — plese in 285 as cn | u Sh. wcccece ess LUS4 as = Chlorides.......-.-less than 0.005% as Cl» Guaranteed Calcium ...-less than 0.02% Bist irons less than 0.0008% Other metals oscassacneoracaeeeoes none SODIUM) Borate;icap-,sanbydrous; powder 2.6.2 .c0.seesesee seu vec use 60 cb .08 Ylb. .22 WD Borate. pruseda(boraxnGlass) ees pe ccmcninta dene ates. en oe 25ee .04 5 lb. 1 1.00 SODIUM Borate, pee ULES ieee Merck Blue Label .......... 1.50 incl Yb. .50 Carbonates... -less than 2% COz2 Sulphates... less. than 0.00875% as SOs Chlorides.......... less than 0.0005% as Cl‘, Guaranteed Sot Scoctedcabs less than 0.02% / Analysis anaes See less than 0.0008% Other MOA fas epnooossoo donc oCancs none, * SODIUM BrOMAtE; C25: hcse ence Sorel, Sraaiajovieloi els ois siarciads, 45 incl 4.30 cb .08 Ydlbo dase incl Bromaters.cccceu cco eee cee Merck Blue Label .40 ine] Se ie. sce 86 B33.c0)s1 5 (0 (-- Eee less than 0.03% as Br. oe Hromidesc. Dacsecetee en ste Baker Analyzed Battersea 80 cb .08 Ylb. 35 5 50 AYR tee OH TAO! IMAL Ss 4S OW Mie aPat AT EN Y Maker or Brand SODIUM Calcium Hydrate (Soda Lime), “ SODIUM Carbonate, erystals (Sal Soda). . s Carbonate, c. p., crystals....... Baker Analyzed Fe 0.010%} SiO: o.oote; «Typical Gls 0.005% ( Analysis SO; —0 001% SODIUM Carbonate, crystals............. Merck Blue Label Subtances insoluble in water..................-+ none HOdIMMU EnV aTOxId Ols.tene cone snake = ideye less than 0.1% Sulphates........... ..less than 0.00125% as SO; Chlorides. : .... less than 0.0001% as Cl STUN CrA STIS. on apa MCSE SOG lan ea cetera ane c none Nitrates... . less than 0.007% 7o as N2Os IRhosphatessine. cous cece cecste less than 0.001% as P20s' Guaranteed PPOLASAN ETI s eo maine siaisa sei kiavteeimatctele less aKa 04% K Analysis Ammonium compounds... less than 0.0001% as NH; Galoitn acne asc ta nonsccvesioenes less than 0.002% Magnesium... less than 0.0002% lesivayon otalaies catte seers cules ce tceinencnehiatente none Tron..... .less than 0.00008% PAYSON Ovi arniaies cere aie sles nicie soles less than 0.00003% SODIUM Carbonate, crystals............. Kahlbaum ‘‘C.f.A.”’ Contenteacsiesceiestecn oes -.-99:73% Chloride...... none Si pela til AGkuadths oes none IN bra vee tees cee tence inci: none REGS phates torent sacl cchine none In 10 Certified Sodium Hydrate............ .none / grams Analysis SODIUM SODIUM SODIUM SODIUM dry, for Nitrogen determina- tions, granulated 4, 8 and 12 mesh Baker Analyzed ita Jo Typical HOM. Analysis Calcium Hydrate (Soda nee, moist, for Carbon Dioxide de- terminations, granulated 4, 8 and TDimeshteeiktia celeriac at oho elses Baker Analyzed ’ 37% of | Typical anes it Analysis d/o Potassium (flame reaction) . . ANSON IO asl. dalclalstacisinceca ties - Heavy metals..... . none Alkaline earths . none, Carbonate, monghydrated, aegis Carbonate, pure, dried powd.. Carbonate, c. p., anhydrous.... 0.001% - 0.0003% 0.010% 0.001% \. Typical 0 | Analysis .--none . none Baker Analyzed 0.020% Loss on Ten Carbonate (anhydrous) Merck Blue Label Substances insoluble in water...............-.- none Sodium erdroxi dies RO Aaa Sa ee less than 0.19 Sulphates less than 0.00125% as SOs Chlorides ...less than 0.0001% as Cl STEHT eae onawedoo IIe DOOR aL SpOeeemeaceasaTe none Nitrates... .......-.----less than 0.007% as N203 PHOSPHATES hoe ue ceca less than 0.001% as P2Os\ Guaranteed Potassium, . -less than 0.4% IX Analysis Ammonium ‘compounds. . “Jess than 0. 0001% as NH @alciumtaetcee secs peness cece. less than 0.002% Magnesium........ less than 0.0002% EVGA ern CUAIS \ ck oyeeynteiciae cise slates evo 100 grm. 1.10 _inel « KALA enema eee ee ate yh Kahlbaumi'C.PRAvee so. 00. eee 500 grm. 3.45 inel Content... . 99.93% : Moisture.. 22mg Chloride.. none Sulphate... oo.cesevensseaen none Sodium Carbonat none \ in 10 \ Certified Binoxalate......... none /grams / Analysis Organic compounds. none Potassium ap eane res . eos RORER EEE OR EBON none Eroniiseee eee .faint trace fs SODIUM@Perhoratetsencmascr esse riccise se eee bere h eepfore antege pps east -65 _ incl Ylb. .30 inel panes IPErmansanate seca mec soes tis ore PRT Inert Es Dome npr Liseice cc toc = see hal ee Sk Inge dt (yes e ald So nb MAE Bateau Maman tes Pry prismairend oC 85 incl Ylb. 30 iel *SODIUM iC CHGE daadedsdedodedode der Baker Analyzed | era h a7 1.00 —_inel WYylb. .85 inel 88.5% 0.002% .0003% \ Typical pene Analysis Taeolable matter.. "SODIUM Peroxide? « \ seaccsicisjfoet os seen MerckoB lies hbabelis ss-mccceecion alse 100 grm. .70 inel Sulphates. less than 0.014% as SO2 Chlorides. less than 0.0015% as cif Phosphate less than 0.06% as P2Os\ Guaranteed Nitrogen.. less than 0.003% ( Analysis Silicates... Zo Heavy metals.........:5.sscseencesss none *SODIUM Peroxide, Carbon free......... Ma BoauSmESEsED sAnoNat | loo 5s apGeoS 1.30. inch -..2 eee Bei Ae hae Peroxide, c. p., for coal analysis Baker Special 15 inel 1.2 incl Ylb. .45 incl a sy Peroxide pcp tLUsedas vce cen eee ar nee teens -20 incl 1.50 incl Ylb. 55 incl sd Phosphate, c. p., monobasic : ¥ (NaH2P0.+ 41:0) Sah ene : Baker Analyzedingy co -sei-c: -75 cb .08 Ylb. .25 ine a Typical Analysis SODIUM Phosphate, pure, crystals, dibasic wgieidiersiereieivie eleieis cee - elieeeescacle, oLOICD: 9209), 35a 54 Aven ots tobi. /3U) 7 4R Fie sly) Be Ele 208 Mi AR tS CP Oww P A NY Maker or Brand SODIUM Phosphate, anhydrous, powder, GibssiGaeccecsie se GSuceat at: sf Phosphate, c. p., dibasic Mee Oc) a a ane Baker Analyzed trace \ Typical 5 Jo. SODIUM Phosphate, dibasic (NasHPO.-+-12H20) ............ Merck Blue Label Carbonates.. .........less than 2% as CO2 alate oe ieee Paani as as ( lorides.......... ess than 5% as Nitrates.. -less than 0.0016% as N05 Gunaniecs Heavy metals.cey se saskeito: sea ar uf PATSONIO! tes lactase ase less than 0. 005% Potassium............. less than 0.4% as K SODIUM Phosphates ys... <6 ec. iiss ee Kahlbaum “‘C.f.A.”’ . Phasphatetn cc os eee Kahlbaum ‘‘C.f.A.”’ @arbonatercctaescnsetas ce none Hulphate:s. qs. Hanacctaek sees none Ghloride:st.e Ribs o-cinanee- none INANE) Shsase Joga oesangouncoee none \ in 10 \, Certified Sonat none /grams/ Analysis Heavy metals................ none Potassium (flame reac- ‘ tion) =... ..0.4-...-...faint trace; SODIUM Phosphate, c.p., anhyd., dibasic. ................. 4 Phosphate, c. p., dibasic, (Ar- : sSenie) free) see eee Baker Special re Phosphate, coml., granular, tri- ASIC. ......+ By ehate ciel tatM tals srs iaiatel ellnreke (nel ales dvekeze $ Phosphate, c. p., tribasic tee 12H.O 0) STA eo SS Baker Analyzed ROSCOE ORO DUC One OenoeDare tds 0.056% 0.003% \ Typical NY aneeo Bh QOQUb OUMBESOCONBC ORE oC TOOLS trace Analysis faan(esfacsto:sinielelefatapaia afainiaie sia nfetatnts] ain trace SODIUM Phosphate, c.p., meta, (NaPO3) ...........-.eeeee a Picrocarminate Solution, tested MOAPON GAs Aki he Santora actos s sano Merck Blue Label SODIUM Baker Analyzed | Typical a Analysis SODIUM Potassium Carbonate =s eee Kahlbaum ‘‘C.f.A.” Potassium Carbonate........... Kahlbaum “‘C.f.A.’’ Hreesalkkaltccc,scetel cores setae ore none : Chloride.. . slight trace Sulphate. -none Nitrate. none sees -none aoe -none\ in 10 \ Certified ery eee /erams / Analysis Thiosulphates... 15.6... case 0 none Alkaline earths... -.....-none Alumina... Heavy metals. sdgnmar 3 Arseriioneeten. Goi) Lene SODIUM Potassium Carbonate, fused, an- hydrous, tested reagent....... Merck Blue Label o Potassium) PhosphateyGs pir. arc, (rece ae stele fe Potassium Tartrate, crystals (Rachelle; Salis) teres hess) nypeeaad aoe ecqaie epacge ss Potassium Tartrate, powder GochelletSalits) ere nat sana. secnse ce nr eer = Potassium Tartrate, c. p.cryst.. Baker Analyzed e SS S88 p-» powder Baker Analyzed (G { Analysis SO; SODIUM Potassium Tartrate, crystals.... Merck Blue Label Calcium tee sceacemace ieee less than 0. 03% Heavwametalandsrctsreectstn wine cree Chlorides... . ..less than 0.0005% a Sci Guaranteed Sulphates.. . ..less than 0.175% as SO:( Analysis Ammonium r compounds....less than 0.0045% as NHsz, 55 Ounce and pound prices Price in other size packages peroz. cont. per Ib. tase 5-2 22 cb ater .35 cb cont. -09 -08 incl size pkg. ly Ib. \4 Ib. 100 grm. 500 grm. 14 |b. 100 grm. 500 grm. per pkg. cont, 15 35 75 1.65 50 1.10 -30 incl incl incl incl incl incl [Xe TARAS a) lA LOLs IRS FA Hes tO Ma Ages Gy OMe OPE Se acmes Neen ys Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. per Ib. cont. size pkg. per pkg. conte SODIUM Py pOUnUSBHBEe) C.ps; paeiase Baker Analyzed! > s-eeece sot 60 cb .07 Yylb. .20 incl .0003% T. 1 ne “none Rata SODIUM Merck Blue Label .......... 80 incl Ylb. .30 incl Phospt Sulph re ¢ less than 0. 0075% as S| Carbon: ...less than 2% as COz Chlorid less than 0, 0015% as Cl \ Guaranteed Nitrates... less than 0.0016% as N2Os/ Analysis Heavy motals.nijcmoceenes ect x aie AT SONIC tineic cic lemiatere less than 0.0005 POtaSS LM rere settee less than 0.4% as K = SODIUMoEyrophosphate ican a iGiyeneen al Maciel etal tierce Pie reprise 1.00 cb .08 Yb. .35 incl ee Silicate; ;coml- solution. een eres eee any Peer 10 ecb .08 lgal. .50 inel Silicate;|comllidiny. lumpecre cone tree eee emer eee ae -16:ce. .08 258 Fe eee xe Silicate;x;comles powders aa eects ere einen Mena ioe: ~20:cc- (04> Ree Bon os sac: < piliea te, Ge0s CEYSUSISH teetering. ARRAN einen ees tigjam ees ine op tS i4 Bs 8 int : WICOMMOTIGE NC op cree eer tecicc 3) RTA cio orien AR cle rrtciele ete 00cb . 4\b. « inc <¢ gianate, COND Scene tein ioaite LGR ERGO eisl akerihe Cems 1.00 a a Vi lb. .35 inel «e Sulphate;ipure,crystuom powder emeeaeeiee te cee) anes oer 10 cb 109° 2... 222 ee pee ce eT Rees CapaEChysualstrerere Baker Analyzed ........... 25 cb .08 Yylb. .15 inel —0.0001% —0.001% Al Typical none ¢ Analysis . ceecee ..-none, SODIUM Sulanate: Lisiianeheienedeteradaieia aaitwcrts Merck Blue Label .......... A5 inel |. LG, eee Substances insoluble in water.. less than 0.001% ee acl Missa uae secede Gusvanteea TOM sews erm iiceesesitsee less th 6.0008 % Galeium aes ea 0. 0208 °f Analysis asnes less ee ono ‘0 Arsenic. .less than 57” 4 SODIUM Ae ganna eee (Pan anecah bat COP Ac iy: oo oiaae Bhalla 1000 arm. .90 — inel in 10 | Certified Z grams, Analysis Heavy metals. . SI \ Solution. neutra SODIUM Sulphate, c. p.,anhyd., powder.. Baker Analyzed ............ 35 cb .07 Yb. 15 inel 0.0003% ) Sfppaos mone l Typical saieisuiate none (i Analysis Cl 0.0001%) ‘SODIUM Sulnhide, juss Demctrcre ae Sri Ooi: Sa ee a Te ae ce ne . oo eG ae ee : alphide;brownwcrystals:. ccs serie enicicis acre danicge mero ss 10cb . (sab east Sulphide, c. p., crystals eed Cera ral Baker Analyzed)". -5..... 40 gb .15 Mlb. .15 _—_imel R Pierce ccccicae osetia tetonc nics 0.0005 r 5 Aa ooteee| ‘Typical : 0.050% ( Analysis cle . trace, SSODIUMUSulphidets ee ane eee Merck Blue Label .......... 65 incl 14 lb. .30 incl °SODIUM cece, Bere not more than 0.0056% Kahlb CCEA? 100 55 ae UpHide = 44 oes cicitvarte stor cries aveicys Malham So Cf cA ees 15 yep ee eee grm. . inc © ss Sulphideves trac ocho: Kahlbaum ‘‘C.f.A.”” ..... OW eres ete ee ee 500 grm. .95 inel ae op a0 Sed } Ammonium sa tans seres-sonef i, 19 Certified “altel sulphides ©. .77( 0m9( Anabi OMSGUTG seine eer reteieneel= remainder °SODIUM SECS, Solution, Oe Seceretisie. Merck Blue Label .......... -60 — inel 4% lb. .30 inel ‘ aaitties -not ae a 0.00056% < 10 04 § ulphite pure, CRY SUAS eects alerts eee, mcekiien eters ~LOce (047 so ae sagieteate eee SODIUM Sulphite, CPs CLV ALBIS oene ee Baker Analyzed ............ 25 cb .08 1% Ib... -15) ine). Fe.. ) Typical Analysis SODIUM Sulphite, crystals............... Merck Blue Label .......... 50 inel Yb. .20° anell eblonides: 35 ae less than 0.002% as Cl ‘ Guaranteed BSc ooo eae ese less than’ 0.60020) Analysis SODIUM Sulphite, anhydrous, powder....° ...........0.es008 cecceccae “15 ce 040 wacko) see ao a SES Gs jen TEI CIOUS oo “: Baker Analyzed ............ 30 cb = .07 Yb. .15 — inel .0005% 0.005°% | Typical ~bo10 Analysis present SODIUM Sulphite, GTiCd at Re ee er Merck Blue Label .......... 85 incl Y%lb. .30 inc] elias ee ens less than 0.002% as C one Guacantecd eavy TMOURIS. . cee ee reese senente ne Analysis Arsenic his. th cach cseaite: less than 0. 000207 ) SODIUM@Martratesmcuip mates oeeeticerr = = BakerlAmalyzed "oesse-.. -75 cb .08 WYwlb. .25 incl 56 AGE lei | WU = IR Eee Tele On Ms Ay SS FEO oy a Y Ounce and pound prices Price in other size package Maker or Brand peroz. cont. perlb. cont. SODIUM Taurocholate, for use in bac- TENIOLOPICAlWOTkKe ae seer nik au os hehe ee ie ae G00 eb 04s, 3. 3 jae are ols Mletraoxalate,: C.iDsris tscen iaae | Pe ane se Hehe core 20 ~—inel 2.00 cb .08 Ke Thiosulphate, ty Bosuphte); pure, crystals.. z Sis ab lereleqeyeiateex.cte ele Cle nan s eackapataaeners 10cc .04 SES DIBGEES, c. ‘p. A “ery stals.. See Aker Analyzed: Waeieeriie.- 25cb .08 aa ak: 250% of Analysis ++... -none SODIUM Thiosulphate, cry stals NA eevee Merck Blue Label Carbonates......... less than 0.17% as CO: Sulphates and ( sulphites... less than 0.01% as SOs‘ Guaranteed Free alkali. ... - Jess than 0.01% as NaOH ( Analysis Sulphides. .......... less than 0.013% as 3( Galetume ae seek. cccecnc cue less than 0.02% SODIUM hioswipnatess. setae tcc. oss Kahibaum * CAG ee. 2 a2 A aS Whiosniphately .. 00,06. sees a. _ Kahlbaum ‘‘C.f.A.”’ .. Free alkalies. . sec daeeon wit) Sulphate..........--..-.-.---none Sulphite... ...none i -none \ in 10 \ Certified -none /grams / Analysis ..none \ -. 99.8% Mechanical moisture........ 0.19% SODIUM Thiosulphate, c. p., crystals.... Baker Special c : ss Thiosulphate, c. p., anhydrous. Baker Analyzed _............... 50 cb .07 IER aes ance Aen Sees aca 0.002% (GAG) ee eee 0.0014 |. Typical Og ey acaac cs cence ceecaicoce 0.8007 ( Analysis RGei sae oat ee see ore nia anaes sean trace, MPOMonungstate; pure .Crystals-q ss) teak. oa ectelsioteie | a eieenieies 1.25 cb .08 ss Mungstatewe pes cece oe ee esis wie acloce sone -20 incl 2.00 cb .08 POOR Tangstates.. 2 vo. so.c0 danse ae oe Merck Blue Label .30 incl Pri te tent. 2% Chinen oo lea thay OD0UE axl Gunrautced Sulphates .........less than 0. 075% as SOs he DPOMLOME MUN States oo" ho). foe acta eons Kahibaum“‘Gf-Ac? 28 eee Suilplinte sso handset tench none Gihlnrid@:-5 2-2. c cine - -lsab ane trace l in 10 | Certified Residue on ignition....... 88.45% ( grams( Analysis Tungstic acid.. . 69.70% SOLUTION, Acid Phosphomolybdic, NOT eee ieee = Isis ee ts 15 gb .05 .80 incl Acid Phosphotungstic, 10%. 8 Sat oh en 15cb .03 1.00 cb .08 Alizarin, (Sodium Monosul- phonate) for detection of freeREL Cling stomach s.c-.ce sare cntieis deck ecisie «o-oo -20 cb .08 G Boas’, for detection of HCl INMPASLTIC UICC Sms sete aoe ses. oes 15cb .03 1.25 cb .08 oy Chloro-iodide of Zinc, after CHULA ernie irae Mme mts iis ee aisys AR ye4 oy WHOS Bee codes s Congo Red, for detection of TREeLLG kn SlOMACH Re aa attack ease dea eemen cen 80 cb .08 Dimethyl -amido - azo - benzol, 0.5%, for gastric juice analysis @hoepien) sorte tes eases cians COREG Ae 80 ~— incl size pkg. 500 grm. Se Ps < Soe Meee 1000 grm. carton 1 liter 1 liter 1 liter per pkg. -20 -75 1.15 1.40 1.40 conte incl incl incl incl incl TER Ons NG aA CC. Ol UM. OE CAL ee > 2) - x (©) 2) = Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb. cont. size pkg. per pkg. cont. SOLUTION, Giinzberg’s, for detection of HIG ini gastric uxce sc: -waiteuees oo eses eee 60 cb :03° col.g2 st. a ee ss Haines’, for detection of 3 Sugar WING Mecesss Jena © cao eesee se aot Coe 1:00: “ince eee. ae “ Hayem’s, fordilutingblood.. ........... Sos an a gge fies ee ope 225)Cb *.08 0752 Sane eee ‘ Hypobromite, for use in Dore- mus Ureometer........... a eee se. as eer 60gb .l° 22.2 eee rf Iodine, for detection of Starch, Alkaloids and pAlcohol cee. Fe aae per epee erase tia =O) Dy ol ee sf ab arraque Besse ee nee cme ee ee eer 20 0 ec oe ‘¢ Lacmoid} J Loge eee ne Methyl Orange, mdicator. >. = -2.-o2-..-- eee 15¢-cinels «2 .o.20cSc. oe ce Millon’s, for detection of PTOLCTOSs see ee ree a eee ae ae ears 25. incl-2.00' gb. .12)..2 2. 5 eee s Nessler’s, for detection of 7. Ammonialanduitesalts..-2., -.. .Pesyaee.2ees 15 incl 1.00 inch afstucckh? Ses ates se Nylander’ Sn ne Ee a te ones Sats = any inel 1.25 incl...:........3) 5 eee a oe QObermayer'ss. Ge joe see aan vanes Loci 25 incl 1.00 incl -:..27 4 eee aS sf Phenolphthalein, 1% alco- HOMGEVSOLUGION ese n soos ct oe aaa eee eek eae SS) Ge a Secew es 50 cb..08 222.022.) eee a Phloroglucin-Vanillin, for de- tection of HCl in gastric PUMICE 28-5 Res oa toc le od Sele ce -60.cb (03) 2. =. = Sea: ncn sons See 3 Platinic Chloride,cip:;.5%-~. 2-2 2-22 --- = +s seneye 00 =~ ine) <0 Ae eee Pe bid Platinic Chloride, c. p., 10%. Beara) ten 325 > “incl (28252. eee « Resorcin, for detection of HCl : IDTV (eats Ne (DN eee RR oo Saeed BORER AS ETC EAT 415, gb ¢.05°1.40\eb 212) eee > s Ruhemann’s I, for estima- Lion! Of URICEACIU Sy ye enna nc le. ls Seis ceetacomts 25:cb 08 see 2 Ruhemann’s II, for estima- a LIONLOLVUTICPNCIG Rt aa oe «eos sai Sans he oo eee BS8iebe .07''. S94R. =o ee = Soap worwwaAteranalysis.5-<.) cae ss seeecicwose< sees 1.00. gb" 1282 Sus ae oe Soda, Chlorinated, (Labar- PACUCTS) eee tes Nene eine e etintereate Stet a weep see 20° Ninel) 240-22 wee Se * Toepfer’s, for gastric juice Mn alyRis Merete pera eee ee eee eee ic 1S, nell 275 icb yO eee se oisson:s; tonaluiinge bloodes iasceee see a= «tse tn oie oe -50'cb" 08705 eee LS Tropaeolin OO, for detection Oleh ClemeasuriGtUlCO me. | teen fees. face get eres 1.00'cb 08" “229.2 eee us MUNICHIC PINUICAROR foot ee nee sere coe 15 incl1.00.cb © 2.08 (2°. eee order is, therefore, made up specially and cannot be ee until the day after order is received. ACID, Hydrochloric, CLE CLIVONID RD epee heen) MSs ole, Seto aes aie tr seo caer ee liter 1.25 gb SE INKFICHCeeInormales Speer ei oem eee) ene et liter 1.25 gb oe Oxalics decinGEnmalermiee a sone ne tain ee Qneseies tia see Sec e ae eeee liter 1.25 gb Pe woulphuric.decinormalereme: cer ds shat see earcests sehen oe ae liter 1.25 gb AMMONIUM: Sulphocvanides;decinormal’s =. 3.2222. 5-2--25-< seeeee =~) ee eee liter 1.35 gb IODINE Vdecmormal ste ae ee ne en oe ne ee liter 1.35 gb POTASSIUM: Bichromate;decinormal’-3-. a4. .see-n-s202-2-2 occa eee liter 1.25 gb S Hydratesdecimormal es foe) weve en ee kee 6) ae liter 1.25 rb xs Permangvanatessaccso nm ees cekceeetess) e peligee 2 Cae eee liter 1.25 gb SHIVER INITRATE, (decinormalscc toon ce eae eg ee ee. ee eee liter 1.35 gb SODIUM: Carbonate; dectnormal -c. so eases sock lt EA eee liter 1.25 gb ce Chloride; ‘decinormale, eo - 5-22) oc ek cee ccccu. o) JER ee ee eee liter 1.25 gb s Hydrate; (decinormals a7. s-2e ha needs ee ee secs, ae liter 1.25 a a i a RMR eet LOTCG:) {04 eaM eee geet sre TANNIN (See Acid Tannic).............. Tartar Emetic (See Antimony Potassium Tartrate). iis bobs Pi.eCongossheetsial0 x 250mm): : 5. Haeeeet sh. sft ll os creme eereead oye 0 hee noe quire .75 incl se - Convowin booksof2bistrips! cif a. veces sissies CPT lees chrcerere nieces book .05 — inel se ss Gongo;ivislsofMlO0lstrips!t' 2 tec eo aersie cere, eee iann Merete ae vial .10 inel sé a Congoxtapetormanrollst ere eee Coe as, -saphemtommeiten ier csectonee cre roll .10 inel £f uo Litmus, blue, red or neu- tralintsheets; 210:x 250 mm. = 7 saekianviast eee osciceeman, ,¢ asleersesys quire .75 incl “G ne Litmus, blue, red or neu- CUA NED OOKSOL.DoISbLLPS ie Merce t: eee ceil Mea Dee tie ok ae book .05 incl sf a3 Litmus, blue, red or neu- t tral, in vials of 100 Str PScp neste Toe POE oo eene gray Aen geae vial .10 incl 5S Js Litmus, blue, red or neu- AEA UNA EL OLIMAR ENR 5-1 1625.2 oe Sclscesele eae Bemis ey elevens alecoetes roll .10 incl Fe “ Litmus, red and blue com- Sins, iD Win ya eco geoo) Gopu aabcucieoongd Bopdneooon | cig tom sec roll .25 inel ef os Mumenic; sheets clOx250mmi a s2-cee e coeeee otic scenes Ieee den quire .75 incl vs Ss Tumeric, books of 25 Mises) Sedsaposucosuonguo' Madooutoboms wocwate JL book .05 inel ce fs Tumeric, vials of 200 strips Natt Oe ERODE NS fe oa Ra oe MMe TOS ay vial .10 incl 5 sf PUNE RC PEA DE ROLING 8 cinco toi acy corte tee ieisueieteaiiny be ieccaes cet eptiate roll .10 incl TETRAMETHYL - PARAPHENYLENE - k DIAMINE HYDROCHLORIDE...... Merck Bluesbabeligtyassa.c0s, , esis okie as 5grn. .75 — inel TETRAMETHYL - PARAPHENYLENE - , TTS HYDROCHLORIDE...... Merck Blue Label «~........5 ........4: 15 grn. 2.00 incl Inorganic matter...... less than 0.05% 6 THALLIUM, AGU Ges h, Baar 9 eaeetels GR ide Catal Saas esa ie ese ESOS incl es teat Satcciis lgrm. .15 incl INET AtE Sere S terosare Laat abate eestor nist aisteyatns ESO urn lume ceteris Alifrgn eye i BYP sheKel| iN: eon ipioe) otto \iteeis H Ty hie OM Ages GOs MR AG Nee ‘Ounce and pound prices Price in other size packages Maker or Brand ner oz earth per |b. cont. : size pkg. per pkg. cont, THALLIUM, sane uote ealdesns! Sic. 2 lo lietein aes & ateyeren eile 1.80 ADC) ee erro eee lgrm. .15 incl THORIUM, metal, c. SACO MOR OEDUOOrEAO GOCEOKMOAa I oAoUoem caccdscecn ,Goodeugns=. Weiler Ii) Ma : Ninale a Pseteseyelaters aistaveyyesss di je are eee etera ineres ae 50 Het 6.50 incl! —o..385.4tee . WIphate ices peeactste ie sceieces 9 Psa seek ere ee 1:00) “inel. |. ...55 Sacer enn ne eee THYMOL, crystalets. scomensecisee cee cote se) | Seccchsnleie savanre aeee ~25' cb” .04, 3.10'cb/ (09 oo nasa een HY MOL. oon tace aesierenceacee IOUS Merck Blue Label .85 imel .......... 4 lb. 1.00 inel Inorganic matter ess than 0.05% G d Bye vrcsvsvreensn nel Analysis SEEN; foil COMM mete TT oe oe eee eine Wehr eee On eae 15 ine! ois Faas ee So foil) pure: (headiiree) aay pene ectn) cise ae fate loan oe eid tones 90 . ‘incl s..536e5.70! See PEN me granulated (mossy), shot or aa zt ah PUG Shope : Sticks a5 2 Soe epee hecloaene te aker Analyzed) 7... ........ 5 inc S inc Ss metal smowderedaesremaanect cc risee Baker Analyzed _............ 1.00 cb .04 Yb. .25 inel Rado okate ih eee a tmae ene oe 0.0003% PE iirc cet cee roar aE tae 0.001 died sts Cees ae SERS ee Os Tol pynical za. al Analysts As. . . -trace TIN anetaleranulated se seenseee eee Merck Blue Label .......... 1.50 incl lb. 50 inel reed BO aks atelal neni ste not mGre res "0.000856 | Tron and Zinc..... not over 0.04% as Sulphides » Guaranteed Antimony io.- ccs 5- sees seneenees at most a trace | ATOMIC Mo aienyeciccistiseectcsinen niet at most a trace INE Chloridemerystalss(Stannous) \eeee oe weet tsetii ieee yn ee eae 45 cb. .08° 2.2.0 0 eee ce Crome: C.ID}, (stannous) Ldotresaoeon Baker Analyzed!" .22°o..-.. -70 cb .07 Ylb. .24 incl Typical Anaisees TIN elie. (stannous). Merck Blue Label .20 inel .......... Ylb. .75 inel polaeaes Pe eae p08 + less than 01257 = Nit Ammonia Samatncs tos than 0.08070 as NH Guaranteed Bont: seu seeaiadon ve ea mtatlesm ener ae = than 0.00075% y Tseni ic ence ce ccccc ce sc cent cccesesse ess an 1970 TIN Chloride, crystals, (stannous)........ Kahl baum Gsf7A2? 3 2 no ee eee 100 grm. .95 _ inel “Chloride, crystals, (stannous)......... Wahl baum s iC sf3AG? Vic. crse coe ereranieereeeres 500 grm. 2.70 _—_—inel Content (SnCl2-+ 2H2O)...... 96.22% Residue present after precipi- {tting Sac aes bec 12mel in 10 Certified Arsenic.) oon. sac eee oe ae eemone a Analysis emnoninn RA npg cocdoocs faint race ULD DBAS ois cleiciaicieieisivieiuble'acielciviniaieiece a . TIN Ghlomde, c. p., crystals, (tannic). . Baker Analyzed ............ 75 gb .15 Yylb. .25 inel Typical ) Analysis TIN Chioride; Clip sumings(Gtanhic) Marea erre mee ces eee onan tee 1.00 gb | .15 Mlb. 385 — inel TIN) ChioridesSolutioneesenensesoe nieces ’ Merck Blue Label .......... 1.20 inc. 144 |b. .40 inel Substance precipitated by Alcohol ......... none | Guaranteed TIN OME Ce Baker Analyeed 1.25cb 07 Ylb. 45 incl Y LOTM ERG a cee ‘30° "inel 2!00eb 106 14 1b. 70 inel SS Oats Cop (Stannic))seeel err Rae Baker Analyzed _................ 90 cb .06 lb. .35 incl Ge Pee een isoneulnaaincicciteteieateslee's NY rane | Typical S01... ool Za Analysis ..trace_ TIN heasiiates c. p., (stannous).......... Baker Analyzed _.............. 2.50 cb .08 Y% lb. .80 inel ss SULIT Cups; (stannous) Bcveveteret Ghd Baker Analyzed __............. 1.25 cb .07 Ylb. .40 Inel MME wie hice cent ae es ical ee 0.001% ( Analysis pisteixintalathietelelsialsieielelsietelelotel=/eleisfeoleinin|=tsinielele wieisie trace. TIN Suiphide, c. p., (stannous)............ Baker Analyzed ..... 2... 28 1.50 cb .08 YY lb. .50 inel TITANIUM, c. it (stammie). OH Beech ie nUES ROROn anaeacrs agp eee 2.50 cb .08 ‘ce a ing! , metal, c. Pa Se Ray aM cay ARN aya re 300° incl’ Heteeaeeeee Sats Sulphate: gure. OEE ees oe U.100:cincl” ER eeeee lgrm. .15 Incl se Oxide (See Acid Titanic)... Ss Potassium Cralates Cc. Bes sae 75 cb .07 Yib. .25 “inel TOLUIDINE, to & ie Poet i a ab Me ii. Sven RSS eens SABO AORN a eioS Aah a eC eeeNe ¢c itd. bia" BReaeeeeee - TOLUENE (raluol), con Beretta sexes in 20 cb .08 Le ae cn ea (Toluol), coml........... : Ree eter cae ant SLL eee 5 gal. 3.00 cen . S ss (Zoluol)s \ciype ages clee ee Seda ont A eh 30 cb .08 lgal. .85en .25 2 WG (Toluol), CRD eles tener eee aera Sih, ca A eee 5 gal. 3.25 en .50 TRICHLORETHYLENE........... tn Ebates sto RO 5 25.cb: 08.< E020 ak Annee TE RIKRESO Li cc ten ore a Senses a aoe 40 incl ©: 20S). a eee TRIPOLI, powder.. SSCA SOLED ROR. OEE cece et OA roe 10 ce, 04.0 5.2 Se ree TROPABOLIN, CIN ie ga re ai Ala Dene ere 20 incl os... dc. Oe (UR Nice Qinbhroageboae tole no cae steer comteae 20 incl ooo. esos Be Avie ivi k. WU. OR H. Tg blige One MG tr Ae 25 Cie) OMe Pie Ase ONG ¥ Ounce and pound prices Price in other size packages Maker or Brand peroz. cont. perlb, cont. size pkg. per pkg. cont, TUMERIC, so the ae SE oa ICT One ace cee oe ema a te pp Aifitet nny 0: Get ais na a orem per (See Test Paper)....... TUNGSTEN, paetal (Wolfram)icip.;powd:. . .60Eemnell Yylb. .25 inel Tested for value of Zinc Dust................ ) Guaranteed Nitrogen............ not more than 0.00112%§ Analysis ZINC, metal, filings, free Fe Arsenic.... Merck Blue Label .......... 1.00 incl 4% lb. .35 inel Arsenic. LS SUNTCOnTOsGRonASo less than 0. 000025%, ZINC, metal, filings, free from Arsenic, nearly Iron free.... ee Merck Blue Label .......... 1.10 incl Y%lb. .35 inel PATSOUIG sein eisrsiatieteis a's elaine ess than 0.000025% Guaranteed Matter oxidizable b = Panheneanete ay . less than 0.028% as st Analysis ZINC, sheet (4x 14 inches), for standard- : é AZATE eis coterie TT ee kei Baker Analyzed _........... 25 inel Ylb. .15 inel on ROCIO T COMHObCOOEnNanoac SoA SooagonS o108e, ‘Typical ins alalafeleloie’ara'a'a\n’a Salsa nia miatale miclalm n'eielajale’ ft ae Meee atatenete ty ciuista iste omre Siapelotnatatcrerne neiane ets 0.016% 5 Aealveie we ecccc crc cer ccc c ces ec cece eresececsvese none ZING, metal’ yam al parma te dens aesctrins acts (crs eet siarsysicieiaisyelaseievete Inia < c.tccre Bees et!) nl] Ylb. .25 inel x Meal Mplatini Ze dees sen eects ores we acre eros Relea sy Laep cis wiveisle alt 2 incl Y%lb. .25 inel § INCE TALES ULE sa sce ere eI oe ieee elie as taaes Ueisia eh,aiethaats 30 cb ..09.-....\. eee naman acc 40 cb .09 Talb.)- 15 meena ZING PArsenitescaines (OLbNO) ee cesace se EPI oot sy setkee bichon eles 1.75 cb .07 44 lb. .60 incl G Horate, CAD Se eee AE iL SE Ie OE ale etiam s aie 1.40 cb .08 Ylb. 50 inel s TU OC RAE sho gancast ac QOse aaa ror mes Sone ea an eenne 20° inel. 2..0.05l.2 Jiaceee ene eee ZINGmGarbonate csp see nese ee Baker Analyzed ~~ ........ 50 cb .09 Ylb. .20 inel SeeChloride;huscd spuULeetatece chee ee ce eee eG eects. ores ye ai nlarate 25. gb .14-. 2:o5. 3 Sy eeee eee ZINC Chloride, c. p., granular: MSereye's excreta Baker Analyzed __................. 385. cb. .07) ¢ iscnce ose Bs erlonee: c. p., sticks. . Fates EDAKereAMALYZEd sf acl. o sack 50 cb .08 |... 5c a Typical { ace * Analysis ZINC Chloride, DOW Oli aciacrccetestcc cece Merck Blue Label .......... -60 incl Ylb. .25 inel Excess of Zinc Oxychloride less than 2.5% ZnO) \ j Sulphates............. less than 0.002% as SOz( Guaranteed = ersien metals. .. een asbie Miicetr Bete Analysis . HOSE Gacaceny less than 0.05% = ZINC Iodide-Starch, solution............. Merck Blue Label .......... 65 incl Ylb. .20 inel . Tested for.. .... .Sensitiveness °“ZINC BEEN) CMD fas) ete eRe eee iBakenpanalysedusesean ms seat. 45 cb .08 Alb: x15 incl e 0.0002% Pe ea a ee mMANCAL Typical ae acute suntan cnbeeuvscacsis state sree —0.0019 To Analysis | Bree weccrecccccceces eee esc ceseetsesees none “ZINC ae tik TSOP S GL CS Sec scree cys oer eek aioe Cera. os erode wont Sc -60 ep 08 Yylb. .30 inel | < Zidesawhite peters Ce eters hie eeeeerhme 4cb .09 2... .3ipeeeeeeeeee Baker Analyzed _................ 35 cb .09 Ylb. .15 inel .. Typical ’ Analysis ApwoRGewiverri | UR Maker or Brand ZINC sade, Cc. p., wet process.......... Baker Special ww mews ster eres asa seensesesissne « none See 0.0054 Typical Mere a, Scape seen ates: 0.001% | Analysis Soyer be oP UEC EE EEOa Ieee epee 0.005% *ZINC ZINC ZINC “ VAT SATIC 7 acta clots cts stale ete abies less than 0.0015%, Sulphates.. 2 less than 0.0075% as SOs Chlorides: 2. o. cen C.... 2.6... best white, imported, melt- ing point 60-62°.C.........2- best white, imported, melt- ing point 74-762C... 00.0... white, filtered, imported, melting point 36°C.......... white, filtered, imported, melting point 40-42°C.... white, filtered, imported, melting point 44-46°C. . white, filtered, imported, melting point 50-52°C....... white, filtered, imported, melting point 56-58°C....... white, filtered, imported, melting point 60-62°C... PITH iorsectionings-- ce erere eee ener Gruebler Gruebler Gruebler * Gruebler Gruebler Gruebler “ ee cont. perlb. cont. per pkg. cont. ae 85 incl size pkg. wets 2.75 inel Ylb. .90 inel ONS Sits 6c Wglb. 1.50 —_inel sone 60) | (CT et ihe ae 7 S200 incl: ev 0.50) SR eee PERS soc 100 grm. .25 _ inel We ro ot 4 lb. 1.50 —_inel aah A Ll Ap Ol See eee 67.50 incl incl “wjecal: “SR wos el” incl) 2. re wo |S incl: 4.2.23 wee oe20) | Incl ”.5..o. cee woo. 6250) Snel. +3 .... 280 “inel . 2 ee oo. 80) nel... GR ..2. 40 incl ... [eee 2s. OORME nel eee eee cee ee ween ee sorts ne kilo .45 inel Y%kilo .50 incl Media for Mounting Microscopic Objects and for Finishing Mounts ASPHAR TUM eso 5.8552. seerto ee bintiaele ci BALSAM, Canada; dry-en. eeasan ct se erenton ce Canada, natural, paper filtered...... Canada, dissolved in Benzol......... Canada, dissolved in Chloroform....... S Canada, dissolved in cecaed sf Damar, in Benzol.. BELL’S MICROSCOPIC CEMENT... BROWN’S TRANSPARENT RUBBER CEMENT. BRUNSWICK BLACK . tr DEANE’S MEDIUM... on FARRANT’S MEDIUM........ vv] i - me ne ous Poni oa wea 10 25 incl oi eee 50 5.00 incl 20 30 2.00 incl 30 45 6.00 inel 30 45 6.00 incl 30 45 6.00 inel 45 6.00 incl 365. (eee incl 40° ee incl 325) ae incl 30) eee inel ers e 30 Eee > D J ae (e) D ja) 4 ab fe) = > w re) (e) = v > Z ne AG MGWOGPRRMIN Es nC AIO PNONALE Cees nse eee oes init cre wise aie, cevsin fai ASAIN MRA ee pi) a alotaloe sa Frere Agar inel sé PELL VORP ET ciate aici te cheaterabe eroie ates hehseteRebapebanch cle wsteretchovslon, Mastic aus otehe BOL incl (EVO LD) SLA Boe OR RE OA ic Boe rec OR StGe DO EERE TUTE 2 in Saar | ORSR-© 2 Gf SOs OS) tis ey a re 15 75 inel HTT RY CAGED 26 eo) gpa See DOr Arana BNE Ges ties iP neue nets Mn lee eh eR SMS 404 incl (AUTRES) CELE U1 Dee Ol Gd Ses Ae hey a Ee Se a Spenco Ree ty OT See. incl iy SSM L Uk Coe a ree I Poe, way shad Fotateicinin cane hos eI atom eeany. | layed aces 02 oer incl Hy Unto 7! Soe Sak a Sg EOS REI ORCI CME ORT AEETINS © GSO Sha bacy Sym 5 a Se eee incl WIPE SEA EM NG MPA D DWE te, cca cities 6 clue cols clsteec stedceremraoeGiei sans vere ewes Ate Bere inel WUTEUTITE, ZATRIS (0 01 TOS aa 6 OE nod eae eenE Eee ince t SReSrn ace Se rl ane tee BOG e504; incl Media for Mounting Microscopic Objects and for Finishing Mounts From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only- 30 gram 100 gram fainars PAIgG an aula ereculneG MMCUULAL sc ccuis s «sac vce saa auldieie wo ebe-cle e wlanyee oldiewieia's she eieisie oes -60 1.50 incl Tae IT OTST NCGS TOTS, TIL ei ao Ii eS re ee en ae eee 25 -60 incl WLU TEED UI WPI INT on apo dpnn pgs aeosenupeeasaanocss0%0G suScsatee Aeneas: < 1.00 2.50 incl SA PANEO STING cI ITA TOMMEIIN. cos, s:c.5crctes ots bi oiesicos eines ae ote evioaeepres Gee concn -50 1.50 inel Microscopic Stains, Dry From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. Where stains are sold in the original Gruebler packages, we have used the German name in the price list, as experience shows users of these goods to be quite as familiar with the German, as with the English equivalent. Author 1Gram 10Grams 25Grams 100Grams Cont. A.—METHYLENBLAU-EOSIN (Reuter)............. 0 22.0... cece eeee 38 3.60) ace Beate a inel RRSP RATER ESE TA Wort Erte teeta yore ae ain a's ci8/o) ahe,bisis sca esd-a ate ctavesaremtarane wetter 325 dO hae aaeei teres incl CLE) GANTENVTESHECD ) = eee-cen- 330! Ra Be aes incl ROM EMEPER WILAES MEA U Sei se mtrcieym nee cleriatein ae siace ares) Slee aetoaias "tale Sealer ae Senate 210 MS ee as incl RY ADIN Gh DEL OTS On ees Seaharo thon oe cic Gtine acerca Ga mentee sca os,. acacia 8h ycine ot) eA ene incl MOR Bip EUNIEs GRRL. Nine cietoitetn oie cpr Pe wisi sci Seine 2 oe cieis yo siSineiesiouglesseertiseaaiel | \sSlereres Stale estar ip eels incl KRIST. OO, yellowish........... Pa pape nee cach aSlcar aaa tie DOE atte ABS asta incl TNE ORANGE rh pcmyssape ee circles ni eiaieieeaciacem Siiaceembae ee ees een sem ae SDD erins ae BETA re incl METHYLVIOLETT 1S Abd aG aay 36 OSA ERS Ot arn eee sien nae SI Ws SIE T oO incl DRS ROS ds es os SarpeeeM Ieee nese oka hiee caleletws =5 | by dente Pee he come yee incl ee LUO DRS to Ea Gino GU EE REID oot REET AOE Aan Gon. © eee eee SOS hat Sire Pag tae oe. incl S A E Bie ote steiatet eee cds itavetel w csa us a.c crn siege dll a ayaratetsinpalaielelalaat eam heals lace SO a arsine ec usicrots incl e B (Hexamethyl-violett)... SO SEE dao eGae CHEE. UnoDeLas SD Tere ete openeey incl METHYLENBLAU, bacillitstainime. =. .0.s 2 Kocheiie ican een -30 65 2.50 inel (See Colors for Injecting)........ Nr ie hE epee conic oes cesviens) eel ayen synthe Mane y incl sf Bokaro eee ok enus csekig kee Siegmund Mayer ...... CAD Aye eet aa enor incl se TMEALE p UT eee eee esis oe ee Guttmann & IBDN et. 3 Die Ase -50 1.25 4.75 inel ‘ EUG Urptyeee ts crows ire ais, clause erets syn aide ae oie eta cted yee ene ene aN 3.20 incl METHYLENBLAU-EOSIN, Jenner................... May-Griinwald 25 Pap Ale a, cae a ite et het incl WIE ELVIEBNB LAU, G. topes cictocneis Sec aAte ts cacieeedes Leishman 38 BDO Ee etna coecrs: incl Vi EOTME A DISC TIENT sobs Ie te SEDI rRE eC eCIrA ICIS SoC orc Alte Seat Oo ca ane eee OSE Mead veer incl LEED MMEINWLO DB ED semis eye seals od aiatonitelece acon. len Sissi waitin else. slele.clers Sr ASS A Nok dope ate 8 incl EURO ARIVEEIN sy SLO Cooke ee Pre racic cose ccs esses P. Mayer 72 Waa oie ae ae Shere Ate inel PVEUCETANVIAT BIEN Ss. 5 opie erase btaeidis nie aie ah aie cielelv'erd slates P. Mayer CBee oer Sash cere § Cidae ae incl UTR SS VANE RIN ese pe eee yim Se at Nr Nf ORS SS SIAM Perce motos user esas S BO 5 Rees ay tang: incl 1 CACTS TOT EI LAN Bi: sets anc RD RIG os SEB Oe IEE SNe IRS ah eR ae tae SD. SAREE pees incl IN AUER MA LUNIR OE aS UEtS ece eee et ce blidiaiear. nie alte sideman ete nn hee BO) arte ee ae a tere incl INPALELS IMO UNG) OT BIS SS Ang es ee a A ee ree sia EA ic eee ee re incl REET ONG RUNGE eetebe ts aoe delos cscs easria cs tie oe [Aga ene canicomenne oat nee Soe Sea Ety) 98 2 incl INATPIEUVIVA MIENIBSIVAIUING | 66 08 els hide oe oS Oe corhss OB Kalsereeye = ee aan.) Oe Eek rien OE incl NAPBDRYEAMINGEDEB ’(Naphtolgelb) i cccs..ccccsscsis) semescebecetetes neveet Ree pee ars re incl WAR HM VEEN BIZAU @hesermuKristalls joc2ecccteeaee se aigtivesigasiete cece! “eee ns BS earn es somes incl IN EMMIS Oh ACN N32 So bo bteon opp eced S59 ONGsseel aa succesespaesae LOSE ay. Ae A AS AS incl NEUTRALROT, rein, nach P. Ehrlich, f. Ha in vital i Gew. zu Graunlareb harbor is. cc) Sasa sod aa saae U7 DRE Sake VA ARS ee inel NG EE OS EN ere erecta hoor tite oes hiints wre we Side wine | MR DSBS eens eaee aisle we DGm Tiber Senece incl NEB AU EC HNO RELY DUA: 555, oe re Ses resis «cs ee ore eer oe tae afetat AE ae PEAS? incl NIBLAU=SULWAIR: sete he es oo SO 2S IN Rc SR ices AOE me Se ctmaes incl A Rive el, kd el) SR JalG Ty JH SOpaMiay Age Cc Author 1 Gram ORANGBLG ir eens sek al... GDh toss Sete cep coud eee meee etieere reir ORGCHINGIPURS @lsracl, UnnewtAta: .....ssce fenios cde medteocie scone cemers 18 ORGEIN, spec. f. Blastin-farbung, Unna......./..:.. 2.2 sen.ss:5 0. .18 OXVORGEING 225 Foc. sGhis cn noen os aloo se he meee Savini 25 COAST OLD DR aD) qh Onan ny Senda Aeon noone TMD Ase o nano! coooddoobatatone | wnocade PATENDESAURE-RUBING...cchess seo ates tees ee nere Kultschitzky ...... PHENOSAFRANIN (See Safranin, pure)............. RETO XUN ROW ee eicieciie sce ioniclrcreciels sisisiere lois sess Birch-Hirschfeld ...... PIKROCARMIN; SIC xe. cc atassiuseiees ers sie.) Siar © Cuceati 25 “ce “ee $ SS ry ee an Ay eS MAG AORN P. Mayer 25 os SO REA Seton ORO ees eee eeser le Ranvier 25 PIKROLITHIONCARMIN, SICC., ‘‘Gruebler’’ (Solu- tion made by dissolving in boiling distilled water, allowing to stand and then filtering).... ................ 23 See P. it SUD BARGU OR CSaoacodtan pocdatdoccds ba. Saodcdaseccocdcce mou IBYIR ONIN Gietrce rencese stereos erie wine lira ehcnars erent Pappenheim _.......... ROSANIPIN CBase) i. ccectanins teeraciie ssc cicie «= « elsin SEE, Bonen ooo Moorea ROSANTEINGCHEORHY.D RAM Ma rcciicaiivis cctec-croeisinve le icine clasciyeiereuelelsis m cintesehels ROSANIEINGsaltipetersaaresten see oe occ cer criiine leis cle serous -tcistssins | oletoyaless cs SCHWELCISAUTER Neen es -ciee eiciseleretscie eisieles ce Gmiciemieis saiciemh sisievelels ROSANITAINVIOLEERT, WrlanstemmPeancce ac- ccna eemeeeemccccicises lucie ce ROSAZURIN Bere Sn ph gee SSeS war el ee PR PR eS pc MN ryt cr ey Pe a RUTHENIUMROT (MANGIN), per 1-10th gram..... ...........:.... 1.50 SAFRANIN O., soluble in water, Pfitzner, Flemming. ................ .....- SARRAININ, pure (ehenosafranin) 2)... /jocs-eaneecl cee eens ein tees S BOlub esingall COHO sae rr .3.: cusiswtehouncterserocicye” « Peteishefalsacis eeanewale ew oars SAUREALIZARINBLAU OR ees cokes scale vole aevepetSIS SES hes Phe tiave mastartahas eet. _yciaretetete SAURBADIZARINGRUNE seein a fenni ssn tie cde ressriec areckihcwn eden SA UREFUCHSIN (See Fuchsin S.).................... SAUREGRUN Sire ote s a aa see cae Mecauee tale (at ave folovand fiat steer sia eh cisiis lalate oi sastecs kaveeshoragtetere: ave SAUREBRAUN BHEO CA eg aig OS OSU ARIE Peer ECS Tce CIAEIG ae eRe eae ree oe a Pe SCHARDAC HORS oMIChaelism ocd ooscisccae cneetinene | stance hanger enreiian sieve SILBERNITRAT-AMMONIAK....................... Fajerzstajn A3 SMARAGDGRUN Stine te ncr fac hinccarasnueon: EA aeRbaceee ccacee SOLTDGR UNG ee ee eee et ur Stent enn ee EA eet oe ce a SUDANSIID forsfat staiminovafter Daddi.... 022 3. .s.ceee dene snare sec. Sessa THUY ANTS ANON oan ection. cna Go COME eS DOOCGGS Of CISUEE EEO NSC Arey meee Sc AUS UWA INT OH Node geactiioo,5 apie ae Ree aaa ee aeRO Tea TS e Mean RHIONINGRUR wHbrls Hoyer wrerdenhainy..-asiscesamies + ceseeeke ce cee 20 TOLUIDINBLAU, Hoyer less SOLO OT Ree ONS 5 SU Cee ETS Cacia Tate PROPAOUINGOORandrOO0 Ne eee eels tic on hontss, — eigeiigind us tones: fe caeee REROVEVAINR OD eet eE Peri ceacinsicmic + Sb-icicisiepetee Sumoece@ameisioge. Saas MES UIVINBIRAUIN Gene eepien tis wae tincaes tet cia osleuiés KOCH ain FS eee VICTORIABLAUMGR: slhusteartenicn cass ccceccecer cl becca teesesting teconns NIOEEMTS CEW AIR Zarate eee s he cis crt cones Ibe Sen Ieee lore anvee ViTARNE ORO Ta (Ors schulemann)scmccnecocicceccate Ws cineldcterseacceal sie hten WASSERBIAULRUnmnaieAvtere teeta ec ctioces vane cians Ts sagvat saokreens WOLLSCHWARZ, Loffier, f. Bact.-Geisseln.......... .......c.0020005 cee : WRT GET SE SIAN: be ceetreciris semis wine cee nas wocleaveu suiaelah a es 40 Colors for Injecting © «(MSR a A Ng eo 10 Grams 25Grams 100 Grams Cont. 20. ° 8... See ee incl inchs te a pee incl wane Oke Die chee ee incl Ae an ida: oAGoo? incl | Dee acre Oia de incl 30.) eee incl 30! RES iad eae eeae incl ihe nad TER Re ee incl sheave one agai eee incl S085. Se tae Cee incl RAE AC he has r50 incl Sn cit SSA im Bist 3 incl BOD: oo ee ee inel M5 oh incl 338) Nosragsl eee incl 2.29). 3. Ae incl 350194 i.4s Ae incl AS Rh a eS ae incl B0jineis MIS incl 85.0 satire Dee inel SO tine UAL CARE incl 50 eRe inel Ow iE ea incl 50. ae. SN incl 40 bb. 28li.c coer incl 1s RI ES Cit incl 30.” (2c AAR incl 30) ec eee inel i. Ee cee incl 35.) con eee eee incl 38... See incl 40) oct ee inel 25'\er «cSt. ea ee inel 25) o.s Se oe eee incl 28... SRE incl 25). dss ee incl bee ORE a seta c incl pi aeb ee RR oe i, « - incl 35 80) yee incl Lose ke eee incl 0 sans oe eee incl 20 has. eee incl ete Mone occ: ; incl 80 ss aoe ee incl 25 lite hone incl 25)" cin b.ck oe incl 1.50). eee incl Bee a 5.3 0 incl 25 ee ee 2.25 inel BO rach incl 3D) she Se incl 25) 94 ca eer teen incl 38 ince see incl 30! ii ee eee incl SO en 7.50 incl 85) 9. te ee incl 25 2. (Ak ae incl Moet ated c inel From the Laboratory of G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. Author 1 Gram BERLUINERBUAU; insolublesmmwatericecscces ca acs ce. fof ekloediewm as ncke BERLINERBLAU Ia, easily soluble in water......... 0 ...........000020 0 cesses CARMIN COERULEUM, for Cystoskopy, 1 tube of 20 TEDLEtA wD ensuD eer tes cena tac ces ease ccc -80 INDIGCARMIN OPT. Ia pure (Indigosulphonate of Soda), for kidney injection. Heidenhain 35 68 10 Grams 100Grams 1000 Grams Cont. a ee 1.00 8.00 —_inel .30 2:65 P5028 incl «ass oie ee incl 3.40. 3.17 See incl ieee EL AO OR Be fie ten sO) UM At) OS CG. VOR Na ee AS NY OY: Author 1Gram 10Grams 100Grams 1000Grams Cont. INJECTIONS—ROT. for injection in vital organs. AD\isgbYaeye) el eye YP RO oR Ease incl LEIM-INJECTIONSMASSEN—(Gelatine injection HPGVET BET 5 Be Soe OI SE Se ee Oi 2 ce ee 40 3.75 inel se sf (Gelatine injection TAARS) TOG S- esence- SS PALLOUGIZ ig a MER Sie S530) SEAS 50 4.50 incl os: ae (Gelatine injection mass) yellow.....-. PCKORIMAN il beni... 1510's sents -50 4.75 inel M3 sf (Gelatine injection TASS) PD IACKS MEER tea ca n% ceils Ladies ciom Asawne 50 4.50 incl ‘ ¢ (Gelatine injection mass) red, conc. fast SG ReDICL: er cA CRC Ea noe. halts tee cc's alos 1.80 17.50 inel METHYLENBLAU RECTIF., for injection in vital ORPANB Spare ariec es te Ehrlich 15 1 As el aes eerie Freee ae incl Staining Solutions From the Laboratory of Dr. G. Gruebler & Co., Leipzig, Germany. Furnished in original packages only. 10 Grams 25 Grams 100Grams_ Cont. PRESTO Es Sol the POND DR UR Re 2 ck oa wee cars oe eee eis ale SE a oe Some iatls R25 cele -30 1.10 inel GIEMSA’S SOLUTION, for the Romanowsky method...... Sie epee Ae Re 40 1.50 incl METHYLENE BLUE POLYCHROMATIC, nach Unna.....................-...22220000- -25 -60 incl Sea 3 15 50 incl EMO ANIVIIINE) | ANGET NVEIPE DUT! fo sre ole lars eins asso ole cee = 5.2.05 Scio = sala Pe Dry Stains in Tablets, ‘‘Soloid’’ Brand The tendency of solutions of the aniline dyes to decompose has always been a source of trouble in micro- scopic work. The “‘Soloid’’ Microscopic Stains contain aniline dyes of the highest quality, and make it possible to prepare solutions in small quantities as required. By their use waste is avoided, and correct results are assured. These are supplied in tubes containing six tablets each, Instructions for making solutions are furnished with each tube. In Loeffler’s alkaline methylene blue, aniline gentian violet and Ziehl’s carbol fuchsin the solutions ob- tained are only approximately equiv alent to those prepared according to the original formule. The figures avoid small fractions in measurement, enabling the solution to be prepared more readily, without diminish- ing the efficiency of the stain. BISMARCK BROWN, pure 0.1 gram. Dissolve one ‘‘Soloid’’ Bismarck Brown in 7 ce of abso- inteialephol and add :/iceyoma ts tilled Water... o5.0 orci. s ane soe cam elieieistercies.ais « ad scenes poe peer ENE BLUE. Dissolve one ‘‘Soloid’’ Borax Methylene Blue in 10 ce of dis- URCRRVpEB Oe meee he RR Sys oa ic ayerece es te SI SRO oars SI ae ES ca a Sia kak SE EIE EHRLICH’S TRIPLE STAIN (Biondi-Ehrlich- Heidenhain Triple Stain). Dissolve one “Soloid” Ehrlich Triple Stain in 25 ce of distilled water, one “‘Soloid”’ Acid Fuchsin in 2 ec of distilled water and mix. The mixture is ready for use and keeps well................... EOSIN, pure, 0.1 gram. To obtain a solution of eosin suitable for general s staining, one “‘Soloid”’ product may be dissolved in 20 ce of 50% alcohol. This gives a 0.5% solution............ EOSIN-AZUR (for Giemsa staining) 0.038 gram. Dissolve one “Soloid”® product in 5 ce of a mixture of equal parts of glycerine and\pure methylial cohols ss oes teee-. = === see eee EOSIN-METHYLENE BLUE (Louis Jenner’s Stain) pure 0.05 gram. Dissolve one ‘‘Soloid’’ pLoaucuHnN 10, cc, of pure methyl alcohols =. 2.51 cccicwsan date sete oe eloe fae ce ne oe ale oe FUCHSIN (Basic) pure, 0.1 gram. Dissolve one “‘Soloid’’ Fuchsin in 2.5 ce of absolute alcohol MME OM OLCCLOMOISCLLLEMEW HUES 30.0 o7 - ciel le sie a ersichek ioe er eet obit one an oboe HMO. cael be GENTIAN VIOLET, pure, 0.1 gram. Dissolve one ‘“‘Soloid’’ Gentian Violet in 7 ce of absolute ml conoAnGraAd Gas iCC.ON, GISGULEG -WALER. <2 cjaciselos siatsre ana daials seleite ha SES Oe oie ea atin dee GRAM’S IODINE SOLUTION, 15 cc. Dissolve one ‘‘Soloid’”’ product of reagent Ain 10 ce of distilled water, add one of reagent B, and when solution is complete, dilute to 15 ce with PamtitlenawALeD wm aie ook Stayt earaue' erste nc ew Ste ated nis oes ARM Se Meaaaals PIA PRAM rote Sis HAEMALUM—Each ‘“‘soloid’”’ product contains Haematein, .0005 grm, and Ammonia Alum, 0.25 grm. To prepare the stain, one product is ground up with 5 cc of distilled water, and boiled a few minutes. A clear solution is thus obtained.................--2..-0.-+0 0-00 HAEMATOXYLIN, pure, 0.1 gram. Dissolve one ‘‘Soloid’?’ Haematoxylin in 1 ce of absolute CONG MmANGIAdGEA GeZOteGIRtULLEC. WALES cn. vas A acncisiete ete sclera oe aie = MEE win nts Sins ech a METHYLENE BLUE, pure, 0.1 gram. Dissolve one ‘‘Soloid’’ Methylene Blue in 7 ce of abso- Mierusholgandeaddusce Of distilled water: 6. -. occ ante ojos ne sane ean se eee oe METHYL VIOLET, pure, 0.1 gram. Dissolve one ‘‘Soloid’’ Biaduc in 1 ce of absolute alcohol ANOMOOG NC GOMGInGINed WALGER: <2. -22 5506 <=. 2ce <2 se har : : : - ROMANOWSEY STAIN (Leishman’s Modification). Dissolve one ‘‘Soloid’” rc duct in 10 ec GinpliresmeumylealcGhpltr. ck 20k diene Se dees cetens Saleae ce S ; By, : at ROMANOWSKY STAIN (Wright’s Modification). Dissolve one ‘‘Soloid’’ product in 10 ce of PULENOHADIEICO NO] eee rte ee emcee es bt re alae eRe ees re A THIONIN BLUE, pure, 0.1 gram. ' Dissolve one ‘‘Soloid’”? Thionin Blue in 10 ce of absolute aleohol and add 5 cc of distilled water.............seeseceeeceeeesees 5 CC Oe eee 69 Per tube Per doz. tubes bo UI aR Hi. Tt joy AOl-eM Sea ss CO - Mae FAS > nD ~ ae Pertube Per doz. TOISON BLOOD FLUID. For the preservation of blood corpuscles and the counting of the same. Dissolve one ‘‘Soloid’’ product in 3 ce of glycerine and 16 ce of distilled water. The solution should always be filtered immediately _ before use. It acts as a simple diluent, prevents clotting and preserves the natural appearance of the red corpuscles. At the same time the nuclei of the white corpuscles are faintly tinted, so as to facilitate their recognition and counting; but no means is afforded for discriminating between the different varieties. . 25 2.55 METHYL ALCOHOL, pure, in hermetically sealed glass phials containing 15 ce.............. 25 3.00 Staining Material in Solution These solutions are made in every case in accordance with the author’s latest formula, and from Gruebler’s dry stains. Because of the instability of many of these solutions, we cannot guarantee their performance unless they are used promptly after delivery. We recommend the purchase of dry stains and the preparation of solu- tions in the laboratory, as the most ‘satisfactory and economical method. The solutions listed below are those for which we have most demand and are kept in stock ready for immediate delivery. Others made promptly to order Author 25 Grams 100 Grams AMMONTAUWATER-GENIDTAN VIOLET cate saacides eis ici cece oe ole Weigert......... -28 45 ANILINE S WA LER-GENDTPAN) VIOLET. <2 cnc aes e cicciclcaee ee vec cleeeere ele Gram: 5. eo nee 45 BIONDE-EHRLICH-HEIDENBAIN’S TRIPLE) MIXTURE......:..-...55.. =... 0-ee dene 30 -60 BISMARCK BROWN; saturated aqueous solution: ... (250-25. - 2-2-5. 0n--5 sank Renee -20 35 BRO WIN Re ee etre sittcs ci resis eee eee RRO ee eI Weigert......... 25 45 -. BROWN, saturated alcoholic’solution...... 2202.22.20 tke Week tees 30 -60 BORAX=d CAR MIEN st scree siete ool ons Se ence ol ours cere eaimeinetee Grenacher...... -20 30 « CARMINE falc oholichtes 5: poten nas tee abe ohare ins ae alert e es Grenacher...... -30 Ast CARBOL-FUCHSIN. (Gabbett’s Solution I.) For use in staining tuber- euli bacilli in connection with Gabbett’s Methylene Blue............. Ziehl-Nielson. . . 20 -40 CARBOLPXYTOL, for cleanin gress ce eerie ies eee cps eileen eee Weigert......... -20 CONG ORRED ee Ae 1s Ae Oe eye CL ee Se ee -20 3D CONGO RED SOLUTION ainidiluted‘alcohol es en ee eee aoe ee .30 55 EHRLICH, TRIACID SOLUTION, for neutrophile granules............... 0 ........22..-05- 45 -80 a3 TRIPLE) MIXTURE; for eostinophilous'cellsits.--2 2.222. -.-22) Useeeee eee ees -60 1.10 ROSINABEUIS Bee ere ak Ge see ene e Wadinin ca Ac ia ae ne ee ae 25 45 « YELEOWISH: saturated ‘alcoholic/solution... 222-5 o2.22sece: oc oa eee eneaoee 30 -60 sid YELLOWISH: saturated aqueous'solution2.......:..--02.2 005250 le oceaesi eee ee 20 -40 EOSINATE) OF METHYLENE, BLUES cnet oak nas eon coe tee Jenner ee 40 sid GABBET, Bacillus Stain, Solution II. For use in staining tuberculi bacilli ANCONNECUON. With Carpol MUCHSIN hes ccs sce tease sec e ak sce sn aetene = qe eReeeEeeE nee 25 -40 GENTIAN VIOLET, saturated aqueous solution................ leks «ce Da eee 25 45 VIOLET saturated alcoholicisolution’.:.cee. 0. 20.44 eeee. DLE 25 45 se V1 100 FS se etc ano oe Oe Et Rae nne OEE Sen CReeiots Homnanace Ehrlich: ......... 25 45 GIEMSA’S STAIN. For use in staining malarial parasites. [qual parts of AZurevilcand Hosin-solucionsreagyitOr use... ... sos cee code een) Ute eee eee 30 -50 GOLDHORN, Polychrome Methylene Bliess...2...uss00.-.. :oaueeesu.. 2a eee eee 45 1.50 One SOlUtIONV Ao Jee LUO as a ae oe an lo IAL ee ate. Bie OL ee -60 1.65 HAEMATOXYLIN, CONCENLTS beans nev ee Berean yeas ieee see RE eS ITS Delafield........ 35 -60 ERON; SolufionyNon lear: eee eek eee een eee Heidenhain..... -20 35 6 TRON; Solation No: 2 eee ec eee ae Heidenhain. .... -30 50 HARRIS’ MODIFICATION OF ROMANOWSKY’S STAIN................ -40 Ae DETAS TEN Ges SAUIN ee a Seno ose c oy snc ae ES RAO RTT LO PRIME Ls Fic: -50 1.25 IODINE JS OLURION Bae ee eas ree Ses Cen ok BENE eee .20 35 JENNER’S EOSINATE OF METHYLENE BLUE....................... : -40 -75 ERISCHMANS BEOODISTAINE eo cee eeine noe see nee Aes .30 2/53 METHYLENE BEUR Sforg bacillus ces terce cen oreo oe ce Sie sige Sk Rocio 25 45 BLUE, Acetic acid, for diphtheria bacillus................ 25 -40 s BLUE, (Soapymethylene lie) Re ae eee eee te ' 30 50 S BUURS Gabbetis ee oore cin. wate: Seguin eat Seen aE 25 40 £ BEUBSEoly chromatic Pree etic ee aoe in Se 45 1.50 ef BLUE, saturated alcoholic solution........................ 50 1.00 ef BLUE, saturated aqueous solution......................... 40 -80 INEUSSERISIS AUN Ee ee i eee erate Tee Facog SS eek EIB ST Sih i 20 35 PAB PE NHEDMUSIPAUN cir secre ae rtn ori ne eel ate efit. ee 20 35 TINCTURE FOR STAINING ELASTIC TISSUE.. hte tion: Ae 55 1.00 TOISSON SOLUTION.. oe a hens 20 35 VAN GIESON SOLUTION... aite ES Pee. 35 65 WRIGHT’S STAIN, guar: anteed ..... Soo nae 5 See accor Do ection eee 50 ae ZIEHL-NIELSON CARBOL FUCHSIN............ the eke eee | Shee eee 25 40 70 He ee hie On 4MD ACS: Ge ROR AME Bes Ano Ne oY: > rs) 4 at, Ee be) Reagents for Serological Work These reagents are furnished in original packages only and are manufactured by the H. K. Mulford Company. Size pkg. Per pkg. AGGLUTINATING SBRUMG Cholera: sisyit Oe ma ae. cee teiite eae eae ee ey Ta 1 grm. 2.00 SERUM ian orgy. Mi tek ee Ney et eRe SIE Te Maco Nn eae 1 grm. 2.00 Us SERUM raratyphoids Aue Minos. Bike PCP eon! oo eee 1 grm. 2.00 ce SERUM Ppbaratypnolden iB cette tra nets oe Stee GOB IAS 5. dius hs omen SER 1 grm. 2.00 ANTIHUMAN HEMOLYTIC AMBOCEPTOR BARBER Ser ese h eee coca sockets een etOltests 3.00 ANTISHEEP HEMOLYTIC AMBOCEPTOR.. Ae AeA tn bibs oo ee at 1 ce. 5.00 ss HEMOLYTIC AMBOCEPTOR PAPER. RRR aN eT ROR CITE Ut Eee eGo et eOLOMteSts 3.00 PANEL GP ING NO) Ge UW OH Me seems ein ee eats AN eis tas oy alk aos Scraes Clin site cette o's cieealetld wists cra 10 tests 3.00 ANG ENe@ holescenin enonbilie day. sem weer iciioe bicicic clara aes cla an eins imine w soe eawle ote esate 10 tests 2.00 BORDEN OUTFIT for Serodiagnosis Ofsyphoid Hever. saenite ie sotaen Ta, «see eee Outfit 3.50 Ba SS us lL tor serodiaenosis of -lyphoid ever. ...0.....0.-5+sccee+s dee ssssetade sees. 60-120 tests 2.50 NOGUCHI REAGENTS, Antigen and Amboceptor..............0.0.ce eee ce eee eceeeenees 10 tests 5.00 Kahlbaum Collections Kahlbaum collection of 200 different Carbon combinations, in stoppered glass specimen vials with foot, each containing from 15 to 150 cc. of material. Imported to order only. Price ‘‘duty free’’...... $75.00 Kahlbaum collection of 98 substances in glass vials, arranged according to Knorr & Duden for the intro- duction to the study of organic chemistry. Imported to order only. Price ‘‘duty free’’........ 9.00 Kahlbaum collection for demonstrations in physical chemistry without loss of material, after Prof. Dr. E. Bose, experiments 1 to 17, with printed directions, packing included, but without tube No. 8b of Carbonie Acid. Imported to order only. RELCO smn UL VRLNCE gts ciNarste aiaisieielate) PY a ovsctlcierctelerciteciaiay«i suka. is Slam mate cette Hedclers wails eye ane eeer eRe 52.75 Liquified Gases Liquefied Gases, in glass tubes for demonstrations, Kahlbaum. Each tube furnished in a velvet lined case. Imported to order only. Duty Free AITMONi aKa CATHIMONT A) Sen cea ocak se sae mee esas. Shai ee eee Eh USE OSU mONSe -20 Cinliye (CIM Oui). ca 3S eas ed et otie ni tA ier On GRO eee ts Er Pi on es Re Me ei en a 3.20 Gvana(@veanorcen) sees Geelas capa sek wteiare ee DEG es BS 8 es Ss ae a Ritts Pe ne 5.12 Kohlenoxysulfid (Carbon Oxysulphide)............... OE Ea oa» NO RM Te i ae 20S mc et ee? ete Kohlensiure (Carbon Dioxide).............. Be Aan I eas SEI a Use eR ee ee ... 4.80 Methylather (Methyl Ether).. ed ena A Ae Se See ae SN Methylchlorid (Methyl Chloride) . BAA eet. ee pied Be ssh 2.88 Nitrosylchlorid (Nitrosyl Chloride) .. FO AETe A rit Ate A tort re nine oO ; S ay 4.48 Bhoswent (hOseene) ack vee etjea das css asiecs es ec - MR A5 Sieis eae 2.56 Salzienre sGhly drocblonicvAGl) mest, s c/ses «ccm cov oleniepie chet le ane nies os sae 3.84 Schweltice Saures( Sulphur DIOxIde) a s.cco-. dass spe easesbiewa dee vokelecudeean ee 2.56 Schwefelwasserstoff (Hydrogen sulphide). ; sont 5.12 Stickoxydul (Nitrous Oxide) .............. ae 4, Stickstofftetroxyd (Nitrogen Peroxide) ..... he ee i - 7 ‘ < ee ones. ~~ a : ioe pikes —- enn a at = one sede a f AAW Rar WurThta OTT ee > ei melhs Tu Ate 2 av VA OST i Athi i 2 hep a pete af wie ¢ : A a) se Peetib REG j 7 +80. ae - joven lien SA he abs pubs ts hy dapipacaoatle AM 4 vo of ee Ltt rier eg, Be ast - i; jd ; 4 we % “ng " i : ey i) Sasa Aa c ee GL } - our? 7 ¥ MiretiAy # ah J slusAt sate nig Lie PERCSS Y, , tae 1) ote Q Laboratory apparatus and 184 reagents PLEASE DO NOT REMOVE CARDS OR SLIPS FROM THIS POCKET UNIVERSITY OF TORONTO LIBRARY