January 1, 1923. 60 EAST /E LEITZ\ \KeWWrk7 10th ST. PRICE LIST No. 4 for Catalog G Photomicrographic Apparatus and Accessories Page Cat. No. Price 9 398 With automatic arc lamp of clock¬ work mechanism. $185.00 399 10.00 400 4.00 401 7.50 402 15.00 403 2.50 404 3.00 405 4.00 406 5.00 407 1.00 408 . @ $1.50 7.50 409 5.00 411 40.00 412 With automatic arc lamp of clock¬ work mechanism. 165.00 413 37.50 10 414 . 4.00 415 . 7.50 417 8.50 418 12.50 419 . 08 16 440 . 105.00 441 6.00 442 7.50 443 7.50 444 32.50 447 . 22.50 Automatic arc lamp of clockwork mechanism . 35.00 449 8.50 450 12.50 451 . 08 20 461 . 50.00 462 7.50 463 10.00 464 60.00 465 7.50 466 22.00 Automatic arc lamp of clockwork mechanism . 35.00 467 8.50 468 12.50 469 . 08 21 Micro Summar 24mm. . 36.00 Micro Summar 35mm. . 36.00 Micro Summar 42mm. . 36.00 Summar 64mm . 40.00 Summar 80mm . 44.00 Page Cat. No. Price 21 Summar 100mm . $47.50 Summar 120mm . 55.00 22 Achromatic Objectives 1* . 4.00 1 . 6.50 la . 11.00 2 . 6.50 3 . 6.50 3a . 8.80 4 . 11.00 5 . 11.00 6 . 13.25 7 . 13.25 10 . 35.00 1/12 . 44.00 23 Fluorite Objectives 6a . .' . 17.50 7a . 17.50 8 . 20.00 8 with correction collar . 26.50 9 . 31.00 9 with correction collar . 37.50 l/12a . 57.00 1/16 . 69.00 23 Apochromatic Objectives 16mm . 26.50 8mm . 35.25 4mm . 48.50 3mm. • . 57.25 2mm. N. A. 1.32... 77.00 2mm. N. A. 1.40... 110.00 24 Huyghenian Eyepieces 0 . ’ . 2.25 1 . 2.25 II . 2.25 III . 2.25 IV . 2.25 V . 2.25 24 Compensating Eyepieces 2 . 5.50 4 . 5.50 6 . 5.50 8 . 7.75 12 . 7.75 18 . 6.50 4 or 6 with micro¬ meter . 8.76 24 Projection Eyepieces 1 . 17.50 II . 17.50 III . 17.50 The manufacture of those items listed in Catalog G, but not mentioned in this price list, has been suspended until further notice. 500— 12-22— B. Catalogue No. 43 G. Photomicrographic Apparatus. E. Leitz Wetzlar Germany. Established in 1849. Branch Offices: 30 East 18th. Street, New-York. 320-326 Dearborn Str., Chicago. 9 Oxford Str. London W. Luisenstrasse 45, Berlin N.W. Neue Mainzerstr. 24, Frankfort o/M. Woskressenski 11, St. Petersburg. Notices and Terms. This Catalogue supersedes all previous editions. Instruments, when being ordered, should be described in strict accordance with the Catalogue, and complete outfits should be further identified by the prefix numbers given in each case. In telegraphic orders use should be made of the code-words appended to the prices. All prices are strictly nett for delivery at our establishments. Packing is charged for at cost price. We have Branch Offices in New -York, Chicago, London, St. Petersburg, Berlin and Frankfort as well as Agencies in all University Centres. We shall esteem it a favour if, subject to your convenience, you will kindly place your orders with our local offices and agencies. Telegraphic Address : “Conmover, New-York.” Digitized by the Internet Archive in 2019 with funding from Getty Research Institute https://archive.org/details/photomicrographiOOerns Preface Since publishing our last Catalogue of Photomicrographic Apparatus and Objectives we have materially improved and added to existing models in the light of the experience gained by an ever increasing number of workers in this branch of Science. We have also constructed entirely new apparatus to do justice to the most recent requirements. In this connection we would draw particular attention to the new large apparatus listed with a Camen having a maximum extension of 1 metre, also to the new appa¬ ratus for taking photographs of Insects after Prof. Hermann. As an appendix to this list will be found reproductions of actual photographs taken with our objectives and apparatus, which cannot tail to carry conviction as to their excellence. Any of the following Catalogues will be forwarded post free on application. 1. Catalogue of Microscopes, No. 43 A. 2. Catalogue of Petrological and Metallographie Microscopes, No. 43 B. 3. Catalogue of Dissecting Microscopes, Lens holders, and Magnifiers, No. 43 C. 4. Catalogue of Microscope Accessories, No. 43 D. 5. List of Haematological Appliances, No. 43 E. 6. Catalogue of Microtomes, No. 43 F. 7. Catalogue of Photo-micrographic Apparatus, No. 33 G. 8. List of Projection Apparatus and Drawing Appliances involving the principle of Projection, No. 43 H. 9. List of Prism Binoculars, No. 43 J. Electros of the illustrations contained in these catalogues are at the service of authors wishing to describe, or refer to, any of our instruments in their works or papers. Wetzlar, January 1911. E. Leitz. 5 New Large Photomicrographic Apparatus I a This Apparatus is characterised by its long Camera sliding upon an optical bench. The essentia] advantage of such a Camera consists in obtaining a large variety of magnifications with a single objective, but, in addition to this, greater depth ot focus is obtained by using an objective of relatively low magnifying power with an extended bellows. The optical bench, which is in two parts, consists of steel tubes mounted at either end and also midway upon cast iron feet the two halves being connected by a hinge arrangement. Upon these tubes can be fitted the various carriers, the curved feet of which fit the tubes exactly, any required position being maintained by means of clamping screws. The Camera occupies one half of the optical bench resting upon two carriers, one of which holds the focussing screen, while the other carries the camera front with a portion of the light tight connection. By means of the hinge provided the Camera can be brought into a vertical position, the apparatus may therefore be used either vertically or horizontally as required. The Camera can be extended to any required distance up to its full length of 100 cm. (40 inches), as each carrier can be moved independently of the other. The bellows besides being very substantially made have additional wire supports, two in number, to prevent sagging when fully extended; the lower portion of the bellows is hinged to the focussing screen so that, upon the withdrawal of two bolts which keep the upper portion in position, it can be retracted in order to observe the image from the front whilst making the necessary adjustments. Two Focussing Screens, one of ground glass and the other of clear plate glass, are supplied with the apparatus, together with two single dark slides taking plates 24 cm. square, with carriers for smaller sizes, either English or Continental. The front of the Camera is also fitted with a pneumatic shutter for time and instantaneous exposures, and the light tight connection referred to above, into which, when working with photographic lenses only, i. e. with Microsummars, without the Microscope, the adapters carrying the objectives can be pushed. 6 New Large Photomicrographic Apparatus la. (Horizontal Position.) The other half of the optical bench is occupied by (I) the Microscope mounted upon a sliding baseplate (2) an illuminating lens or condenser (3) a large iris diaphragm, and (4) a Liliput Arc Lamp, each of which is adjustable for height, that for the sliding- baseplate carrying the microscope being controlled by a hand wheel below the level of the steel rods, this adjustment being necessary to compensate for the difference in the height of the optic axis of the various patterns of our Microscopes when placed in a horizontal position. A special mechanism is fitted to the baseplate, which in con¬ junction with a lengthening rod, permits of the fine adjustment being effected whilst observing the image on the screen. New Large Photomicrographic Apparatus la. (Vertical Position) For taking photographs of large objects with the Microsummars, without the microscope, a special vertical stage is provided mounted on a sliding carrier and fitted with a micrometer screw fine adjust¬ ment, to which the lengthening rod referred to above can also be connected should the length of the camera necessitate its use. A series of interchangeable diaphragms are supplied with the stage, the diameter of each of which corresponds approximately to the focal distance of the lens with which it is to be used, each diaphragm being provided with an illuminating lens which will illuminate uni¬ formly and without colour the given aperture. Objectives and dia¬ phragms are marked so that the correct pair can be rapidly selected, and the set, together with the adapters to carry the objectives to the light-tight sleeve, are packed in a case with lock. The whole apparatus is placed upon a table of about 225 cm. (8 feet) in length, which is so constructed as to be easily taken to pieces for packing. No. 398. New Large Photomicrographie Apparatus la, available for use both in vertical and horizontal position with Camera 1 metre (40 inches) in length, mounted upon a steel frame. One ground and one clear glass focussing screen, two single dark slides for plates 24 cm X 24 cm, with carriers for smaller English or German sizes. Time and instantaneous shutter with pneumatic release. Base plate with vertical adjustment to suit any of our Microscopes. Large Illuminating Lens 8 No. on Stand, together with two additional stands to carry the Iris Diaphragm and Source of Light. Magnifying Glass for focussing the image on the screen, and Shutter between Microscope and Camera . 399. Iris Diaphragm to fit on Stand, with cell containing 3 glass discs, yellow, green, and white, with ground surface, for use as light filters . 400. Glass Tank mounted to fit Pillar Stand . 401. Focussing Gear to operate new fine adjustment of Stand from end of Camera . 402. Stage with sliding and micrometer screw fine adjust¬ ment to carry large specimens not exceeding 100 m/m in diameter . $ Code word 120. — Mieonia 8 — Mieranieo 3.20 Mierantho 6. — Mieraspis 12. — Mieraster (when working with extended Camera the lengthening rod is required for focussing.) 403. Diaphragm with illuminating Lens for Microsummar 24 m/m 2. — Mierobal 404. Do Do Do 35 m/m 2.40 Mierobio 405. Do Do Do 42 m/m 3.20 Mieroearpa 406. Do Do Do 64 m/m 4.— Mieroeebus 407. Do without illuminating lens Do 80 m/m .80 Mieroeiona (For the Microsummars 100 and 120 m/m the opening of the stage acts as a diaphragm ; the large condenser provided with the appa¬ ratus will be found as efficient as a special lens for illuminating the microsummars 80, 100, and 120 m/m. With these illuminating Lenses sharply defined images can be obtained without the use of the diaphragms, provided the diameter of the object is somewhat less than the focal length of the objective used.l 408. Set of 5 Adapters for the Microsummars, each engraved with the designation of the objective with which it is to be used . at $ 1.20 409. Wooden Case with lock for the set of Diaphragms with illuminating lenses and the 5 adapters . 410. Liliput Arc Lamp, 4 Amp., with rack feed, centring ad¬ justment, and extension gear by means of which the carbons can be adjusted while observing the image on the screen 411. Table with iron legs, levelling screws, ball castors, and polished wood top, 225 cm (8 feet) long . Packing . 412. New Large Photomicrographic Apparatus lb with Camera having an extension of 60 cm (24 inches) otherwise as above . 413. Table with iron legs, levelling screws, ball castors, and polished wood top, 185 cm (6 feet) long . 6. — Mieroelase 1.20 Mieroeline 18. — Mieuere 32. — Mierolabis 218.80 Mieologieo 5.— 104. — Minurie 30. — Minuetia 43 G am. 9 2 Code word No. 414. Mechanism foi actuating the fine adjustment when using a microscope with the old form of fine adjustment . 415. Incandescent Gas Lamp, with sheet iron chimney and coloured glass discs, mounted to fit the pillar stand 416 Acetylene Lamp, mounted to fit the pillar stand, with separate gas generator . (Acetylene light should only be used when a supply of gas or electri¬ city is not available ) 417. Resistance for Liliput Arc Lamp, for 110 volt current 418. Do. suitable for 220 volt current . . . 419. Carbons for Liliput Arc Lamp, per pair . $ 2.40 Mierauliea 6. — - Mieatio 13.60 Mieabam 6. — Widerstand 10. — Widerstehe — .06 Kohle Large Horizontal Photomicrographic Apparatus I. This apparatus conforms in size and equipment to that described in the preceding pages. It differs from it, however, in regard to the hinge arrangement which is omitted, consequently it can only be used in the horizontal position. The other details given in the preceding description apply equally to this apparatus, which is carried on a similar table. N0 $ Code word 420. Large Horizontal Photomicrographic Apparatus I, with Camera 1 metre (40 inches) in length, mounted upon a steel frame. One ground and one clear glass focussing screen, two single dark slides lor plates 24 cm X 24 cm, with carriers for smaller English or German sizes. Time and instantaneous shutter with pneumatic release. Base plate with vertical adjustment to suit any of our Micro¬ scopes. Large Illuminating Lens on Stand, together with two additional stands to carry the Iris Diaphragm and Source of Light. Magnifying Glass for focussing the image on the screen, and shutter between Microscope and Camera . 100- — Miera 421. Iris Diaphragm to fit on Stand, with cell containing 3 glass discs, yellow, green, and white, with ground surface, for use as light filters . 8. Mieranico Carried Forward 108.— 10 11 Large Horizontal Photomicrographic Apparatus I No 422. 423. 424. 425. Brought Forward Glass Tank mounted to fit Pillar Stand . Focussing* Gear to operate new fine adjustment of Stand from end of Camera . Stage with sliding and micrometer ..screw fine adjust¬ ment to carry large specimens not exceeding 100 m/m in diameter . (when werking with extended Camera the lengthening rod is required for focussing.) Diaphragm with illuminatingLens for Microsummar 24m/m $ Code word 108.— 3.20 Mierantho 6. — Mieraspis 12. — Mieraster 2. — Mierobal 426. Do Do Do 35m/m 2.40 Mierobio 427. Do Do Do 42 m/m 3.20 Mieroearpa 428. Do Do Do 64m/m 4.— Mierocebus 429. Do without illuminating lens Do 80m/m —.80 Mieroeiona 430. 431. 432. 433. 434. 435. 436. 437. 438. 439. (For the Microsummars 100 and 120 m/m the opening of the stage acts as a diaphragm; the large condenser provided with the appa¬ ratus will be found as efficient as a special lens for illuminating the microsummars 80. 100, and 120 m/m. With these illuminating Lenses sharply defined images can be obtained without the use of the diaphragms, provided the diameter of the object is somewhat less than the focal length of the objective used ) Set of 5 Adapters for the Microsummars, each engraved with the designation of the objective with which it is to be used . at $ 1.20 Wooden Case with lock for the set of Diaphragms with illuminating lenses and the 5 adapters . Liliput Arc Lamp, 4 Amp. with rack feed and centring adjustments, but without extension gear*) . Table with iron legs, levelling screws, ball castors, and polished wood top, 225 cm. (8 feet) long . Packing . Mechanism for actuating the fine adjustment when using a microscope with the old form of fine adjustment . Incandescent Gas Lamp , with sheet iron chimney and coloured glass discs, mounted to fit the pillar stand Acetylene Lamp, mounted to fit the pillar stand, with separate gas generator . (Acetylene light should only be used when a supply of gas or electri¬ city is not available.) Resistance for Liliput Arc Lamp, for 110 volt current Do* for 220 volt current . . Carbons for Liliput Arc Lamp, per pair . 6.— Mieroelase 1.20 Mieroeline 14.- Mieroeosmo 32 — Mierolabis 194.80 5.— Mierografo 2.40 Mierauliea 6. Mieatio 13.60 Mieabam 6.— 10.— —.06 Widerstand Widerstehe Kohle If desired the lamp may be fitted with an extension gear for adjusting the carbons from end of Camera at an additional cost of $ 4 — 12 Universal Photomicrographic Apparatus II This Apparatus can be used with the Camera in a horizontal or vertical position, it can also be used as a Studio Camera. The Stand, as in the pattern previously described, consists of two parallel steel tubes mounted upon iron feet at either end, upon these tubes rests a rectangular iron plate covered with felt, which can be moved to any desired position throughout their length. The Microscope is secured to this plate by a cross bar and clamp which holds the front toes and thus fixes the instrument firmly in the horizontal position. A small Optical Bench is also screwed to the same end of the plate, upon which two separate pillars are mounted to carry the illuminating lens and the source of light. Universal Photomicrographic Apparatus II. (Horizontal position). A vertical stage for large sections of which a general view is required can be fixed to the plate in various positions suited to the focal length of the objective in use. This stage is provided with three diaphragms of different sizes suitable for specimens the maximum diameter of which does not exceed 100 m/m, and is clamped firmly in position by milled headed screws. 43 G am, 13 3 A massive column is screwed in a vertical position to a pro¬ jection on the right hand side of the stand, on which slides a fitting which can be clamped in any desired position, rotation being prevented by a key way or groove in the column. This adjustable fitting, which carries two parallel tubes upon which the Camera is mounted, can be rotated so as to bring the Camera from the horizontal to the vertical position, at either of which positions stops are provided, it can, however, be fixed at any intermediate angle by means of a clamp controlled by a large hand wheel. Universal Photomicrographic Apparatus II. (Vertical position.) Upon one of the tubes carrying the Camera slides a grooved fitting capable of fixation by a thumbscrew, at both ends of which clamping sockets are mounted so that the camera front can be readily fixed at either end. The desired camera length is thus obtained, partly by changing from one socket to the other, and partly by sliding the grooved fitting along the bar upon which the length required can be read off. The front of the Camera is provided with rack and pinion adjustment for focussing low power objectives such as the Micro- summars, which are attached directly to it. 14 Such objectives are first fixed to a small plate and secured by an adapter, various adapters being of course required to suit the objectives used, the plate is then inserted into a forked fitting screwed to the front of the camera in place of a similar plate carrying a sleeve, with which it is interchangeable, and which forms a light-tight connection between microscope and camera when the former is in use. This type of apparatus has a camera extension of 50 cm . (20 inches), but a similar pattern, with an extension of 1 metre (40 inches) can be supplied to special order, for use with which it is essential to have the mechanism with lengthening rod for actuating the fine adjustment whilst observing the image on the screen ; with the smaller camera although a convenience, this attachment is not absolutely essential. Universal Photomicrographic Apparatus II. (Arranged for photographing large Specimens. We recommend for use with this apparatus as an artificial illuminant either the Electric Arc (Liliput Lamp) or Incandescent Gas : the Acetylene Light can be used, but is only to be recommended when neither of the above is available. No. 440. Universal Photomierographie Apparatus II, with Camera having an extension of 50 cm. (20 inches), mounted on a steel tube stand; with ground and clear glass focussing screens; two single dark slides for plates 24 X 24 cm, fitted with carriers for smaller English and German sizes. 15 No. Code word Plate carrying the Microscope, suitable for any of our Stands, with Optical Bench ; Illuminating Lens ; Magnifying Glass for focussing the image on the Screen, and Expo¬ sing Shutter . . . . . 441. Incandescent Gas Lamp, with sheet iron chimney and coloured glasses, green, yellow, and matt . 442. Focussing Gear for actuating the fine adjustment of the Microscope at a distance . 443. Stage with Set of Diaphragms . Packing . 444. Table with iron legs, levelling screws, ball castors and polished wood top 1 15cm. (46 inches) long, suitable forabove 445. Universal Photomicrographic Apparatus Ila, with Camera having an extension of 1 metre (40 inches), otherwise similarly equipped as above . 446. Table with iron legs, levelling screws, ball castors and polished wood top 225 cm (8 feet) long, suitable for the Apparatus Ila . 447. Liliput Are Lamp 4 Amp, mounted with centring adjustments to fit the pillar stand . 448. Acetylene Lamp, mounted to fit the pillar stand, with separate Gas Generator . (Acetylene Light should only be used when a supply of gas or electricity is not available). 449. Resistance for Liliput Arc Lamp, suitable for 110 Volt current . 450. Do. suitable for 220 Volt current . 451. Carbons for Liliput Arc Lamp, per pair . Photomicrographic Apparatus 82. — Migrai 6. — Mieatio 6. — Mieraloa 6 — Mierabaeia 100. — Migrava 2.— 26. — Mierotea 120. — Migravano 32. — Mierolabis 14.— Mieroeosmo 13.60 Mieabam 6 — Widerstand 10. — Widerstehe —.06 Kohle III For taking photographs of Insects, suggested by Prof. Hermann. This Apparatus, which is constructed for use in the horizontal position only, is mounted on a stand similar to those previously de¬ scribed, consisting of two steel tubes resting upon two pairs of cast iron feet. The camera, which can be extended to 70 cm (28 inches), is mounted upon steel tubes in a similar manner to the large horizon¬ tal apparatus No. I. It has wire supports to prevent sagging, and the bellows frame can be retracted in the same manner. The front carrying the objectives is fitted with a time and instantaneous shutter. 16 Two Lamps (Liliput Arc, or Incandescent Gas) with condensing lenses, serve to illuminate the object. These lamps are mounted on slotted arms attached to the pill¬ ars carrying the camera front in such a manner that not only the distance of the illuminant but also the angle of incidence of the light can be varied within wide limits, it thus becomes an easy matter to illuminate an object brightly and uniformly, or to control the density and position of the shadow required to give the necessary contrast. The object holder consists of a base plate sliding upon the tubular base to which it can be clamped in any desired position by means of a thumb screw. It has two micrometer screw adjust¬ ments for moving the object in a horizontal plane at right angles to one another, one of which serves for lateral displacement, and the other for focussing the image on the screen. The former is especially useful when taking stereoscopic pictures, and both are provided with lengthening rods, so that the adjustments are easily effected when sitting in front of the focussing plate. Photomicrographic Apparatus III. For taking photographs of Insects, after Prof. Hermann. For the vertical adjustment of the object a rack and pinion adjustment is provided, upon which is mounted a universal aim carrying a glass rod, the possible movements of which are w ell shown in the illustration, the object being fixed to the point of the rod by an adhesive, or by first mounting upon cork. In order to render the Apparatus suitable for taking pictures by transmitted light the universal arm figured and desciibed must 17 be removed from the pillar which is actuated by the rack and pinion, and replaced by a vertical stage ; the illuminant (Liliput Arc or Incandescent Gas) and condenser are then mounted on a special removable optical bench behind the stage. Our Microsummars will be found particularly suitable for use with this apparatus, but if higher magnifications, such as can only be obtained with a compound microscope, be required, a tube carrying objective and eyepiece can be screwed into the front of the shutter, thus dispensing with the ordinary microscope stand. No. Code word 452. Photomierographie Apparatus III, for photographing insects by reflected and transmitted light, consisting of a horizontal Camera 70 cm. (28 inches) long mounted upon an optical bench ; ground and clear glass focussing screens, two single dark slides for plates 24 X 24 cm, with carriers for smaller English or German sizes ; time and instantaneous shutter with pneumatic release; two slotted moveable arms upon which the lamps and condensing lenses are mounted; a movable stage, adjustable in all directions, with mechanism for actuating two of the move¬ ments while observing the image on the screen : magni¬ fying glass for focussing . 72.— Migratur 453. Two Incandescent Gas Lamps with sheet iron chimneys . 12. — Migretis 454. Two Illuminating Lenses 100 m/m diameter . . . 16.— Migueros 455. Accessory Apparatus for use when using transmitted light, consisting of a tube screwing into the camera front, vertical stage, and small optical bench for illuminant and condensing lens . 10. — 110.— Mikado Migravero Packing . 456. Table with iron legs, levelling screws, ball castors and polished wood top 115 cm. (46 inches) long, suitable for above apparatus . 457. Two Liliput Arc Lamps 4 Amp. mounted with centring adjustments and condensing lenses . 458. Resistances for Liliput Arc Lamps suitable for 1 10 volt current, . each 459. Do suitable for 220 volt current . . ,, 460 Carbons for Liliput Arc Lamp, per pair . 2.- 26. Mierotea 36.— Migratos 6.— Widerstand 10.— Widerstehe -.06 Kohle 18 Small Photomicrographic Apparatus IV. This Apparatus, which has a Camera extension of 25 cm. (10 inches), is designed for use in the vertical position only. It consists essentially of a rectangular base-plate of iron covered with cloth, on one side of which a vertical steel rod is mounted in a massive socket. This rod carries the Camera, which, by means of two clamping fittings as shown in the illustration, can be fixed at any required height, and when so fixed rotated for the final adjustment of the specimen on the stage by direct observation, the return of the Small Photomicrographic Apparatus IV. camera to exact alignment with the optic axis of the microscope being insured by the provision of a spring catch on the camera fitting, which engages with a groove in the steel rod. The length of the camera is adjusted by sliding the rod carrying the front up or down in the grooved fitting in which it is mounted. A light tight connection is fitted to the front of the camera for use with the microscope, into which photographic objectives (Microsummars) can be fitted by means of the sliding adapters provided, when the microscope is dispensed with. 19 No. 461. Small Photomierographic Apparatus IV, with vertical camera having a maximum extension of 25 cm. (10 inches) ; ground and clear glass focussing screens; two single dark slides for plates 18 cm by 13 cm with carriers for smaller sizes, Shutter, and Magnifier for focussing . . 462. Incandescent Gas Lamp, on a table stand with sheet iron chimney and 3 glass discs for use as light modifiers, ground, yellow, and green . 463. Condensing1 Lens 100 m/m diameter, upon Table Stand Packing1 . 464. Small Photomierographic Apparatus IVa, with verti¬ cal camera having a maximum extension of 50 cm. (20 inches), otherwise as above . 465. Attachment for obtaining the requisite displacement of the objective when taking stereoscopic pictures 466. Liliput Are Lamp 4 Amp, mounted on a table stand with condensing lens . 467. Resistance for Liliput Arc Lamp, suitable for 110 Volt current . 468. Do. suitable for 220 Volt current . 469. Carbons for Liliput Arc Lamp, per pair . $ Code word 40.- Migravi 6.— Mikail 8.— Illuminize 54.— Migpavisse 1.— 62.- Migravimus 6.— Mikion 16.— Liliputer 6.— 10.— -.06 Widerstand Widersteho Kohle Microsummars. To obtain pictures giving a general view of large transparent specimens, or of opaque objects requiring considerable depth of focus, we would recommend our Microsummars of 24, 35, 42, 64, and 80 m/m focal length, also the Summars of 100 and 120 m/m focus, Series I. Both Series, Microsummar and Summar, have an aperture of F/4.5, and are perfectly corrected, being free from chromatic and spherical aberration and astigmatic error. 20 Microsummars and Summars F/4.5 with Iris-diaphragm. Focus mm 24 35 42 64 Oo O 100 120 Price . . $ 24.- 24.- 24. - 28. 30. 1 CO 40.— Code word Summara Summanetis Summanat Summand Summarize Summa Su mmario Magnifications of the Microsummars and Summars F/4.5, Distance of the focussing screen from the diaphragm of the objective in mm Designation of Objective in mm of focus 120 100 80 64 42 35 24 250 1 IV* 2 3 472 6 9 500 3 4'/2 572 7 11 14 20 1000 7 1 9 1172 15 23 28 46 The maximum diameter of the object photographed should not exceed the focal length of the objective. 21 Achromatic Objectives. Designation of Objective Focal Length (Fo)** mm inch Numerical Aperture (N. A.) Micrometer Values measured with Eyepiece II Price $ Code word 1* 42 15/s 0.08 0.062 mm = 62 /u 3.25* Oakum 1 1 40 17a 0.11 0.054 mm = 54 /u 6.— Oaritls ft 1a 33—24 174—1 0.05—0.07 0.080 — 0,054 mm 80—54 /< 10.— with corr. collar Oasenos 1 2 24 1 0.21 0.030 mm = 30 /u 6.- Obarat / 3 Dry Series\ 1 3a 16.2 7s 0.30 0,017 mm = 17 6.— Ocaleo 13.0 72 0.40 0 0 3 3 II ui 8.— Ocalear 1 4 10.0 7^ 0.47 0.009 mm = 9 ,« 10.— Oderite 1 5 5.4 1 V, 0.77 0.0054 mm = 5.4 /1 10.— Oedipe 6 4.0 V® 0.82 0.0037 mm = 3.7 ,u • 12.— Oflte \ 7 3.2 Vs 0.85 0.0029 mm = 2.9 / 1 12.— Ogdoad Water- Immersion 2,1 V12 1.20 0.0018 mm = 1.8 // 28.— Wateroog Oil-immer- ^/10 2.8 V10 1.30 0.0026 mm = 2.6 « 30. Immersit Lenses rl/12 1.8 V12 1.30 0.0017 mm = 1.7 i> 40. - Immersion ** For explanation of this term see our pamphlet: ’’The Microscope, and some hints on how to use it“. * The formula of objective 1* is that of a single doublet. It suffices for many purposes, though its light-transmitting power is slightly less than that of objective No. 1. 22 Fluorite Objectives Designation of Objective Focal Length (Fo)f mm Numerical aperture (N. A.) Micrometer Values measured with Eye¬ piece II Price $ Code word Dry- Series 1 6a 4.0 0.82 0.0037 mm = 3.7 u ■, 16. — Ofuscar 1 7a 3.2 0.85 0.0029 mm = 2.9 f 16. - Ogmore )• 2.6 0.87 0.0024 mm = 2.4 fi 16. — ** Ohlme 9 2.2 0.87 0.0019 mm = 1.9 fi 28. — ** Oigamos Oil- immer¬ sion Ob¬ jectives 112a 1.8 1.32 0.0017 mm = 1.7 /u 52. Immersivo 1/16 „ 1.32 0.0014 mm = 1.4 ri 60.— Immersorum ** Objectives 8 and 9 may be provided with a correction collar, which adds $ 6.— to their cost Apochromatic Objectives. Designation of Objective Focal Length (Fo)f mm Numerical Aperture (N. A.) Micrometer Values measured with Comp. Oe. 4 Price $ Code word Dry Series 16mm 16 0.30 0.0160 mm 24.— Apochabo Apochanda 8 „ 8 0.65 0.0080 mm CO to 4 „ 4 0.95 0.0040 mm 00 w Correctiou Collar flpocharem 3 „ 3 0,95 0,0030 mm 52.— Apochaturus Oil Immersion 2 mm 2 1.32 0.0020 mm 100.— Apochauit 2 ” 2 1.40 0.0020 mm * 1 o CO T— « Apocho * Although, considering its very high aperture, this objective is substantially mounted yet it is advisable to exercise the greatest care in its use so as to avoid the risk of forcing in the front lens. Should this however occur we are prepared to remount the lens free of charge, provided it is otherwise undamaged. f For explanation of this term, see our pamphlet: ’’The Microscope, and some hints on how to use it“. 23 Huyghenian Eyepieces. Designation 0 1 II III IV V Focal Length: (Fe)f mm 62.5 50.0 41 65 31.25 25.0 20.85 250 , Eyepiece Magnifieati. Fe t 4 5 6 8 10 12 Code-word Oculabo Oculaire Ocular Ocularetur Oculari us Oculariter Price, each $ 2. — . Compensating Eyepieces for the Apochromatic Objectives. Designation 2 4 6 8 12 18 Focal Length Fef mm 90 45 30 22.5 15 10 Eyepiece 250f Magnifieation Fe 2.8 5.6 8, 11.1 16.7 25.0 Price .... $ 6.50 6.50 6.50 10. 10.— 8.- Code word 1 Compe Compensa Compensado Compensare Compensavi Compensing Compensating- Eyepiece 4 or 6 with micrometer: $ 8.50. Code-word: Compensor Compensons Projection Eyepieces. Designation ! II III Focus (Fe)f mm 90 45 22.5 Eyepiece Magnification 2^°! .T C 2.6 6.0 10.0 Price . $ 14.— 14 — 14.— Code word Projicare Projicet Projicis f For explanation of these terms see our pamphlet: ’’The Microscope, and some hints on how to use it.“ 24 Initial Magnifications of Objectives. Objective Objective Achromatic Magnifietn. Apochromatic Magnifietn. Objectives A i and Fluorite objectives A . Fo. 1 Fo. 1 Dry No. V Water- immersion 1 a 3a , 10 Homogeneous Oil immersion 7io_ 7i» 2,7 3.2 2,0—3, 5.8 10.3 14.1 18.2 33.3 46.0 58.1 90.6 70.0 100.0 Apochromat 16 mm Dry Homogeneous Oil Immersion 8 FI uorite No. 6 a „ 7 a „ § „ 9 Visa 11.5 23.0 46.0 66.0 46.0 58.1 69.1 85.2 100.0 7< 16 Apochromat 2 mm 114.0 92.0 The total magnification for any given combination of objective, eyepiece and camera extension can be obtained by multiplying the initial magnification of the objective given above by the number given in the next table representing the magnification of the eyepiece at the extension chosen. For example ; The objective 4 with the projection eyepiece II and camera extension of 400 mm will give a magnification ot 18.2 X 11.0 = 200 similarly an objective 6 with the projection eyepiece I, and a camera extension of 1000 mm, will give a magnification ot : 46 X 11-5 = 530. f For explanation of this term, see our pamphlet : „The Microscope and some hints on how to use it“. 25 Magnifications of Eyepieces. Projection, Huyg-henian and Compensating1 at various Camera extensions. Extension of cam in mm era Fe 1000 800 600 500 400 300 250 200 Proieetion Eyepieces 1 90 11.5 9.2 6.7 5.6 4.5 3.1 2.6 1.8 II 45 27.5 22 16.5 13.5 11 7.5 6 4.5 III 22.5 40 32 24 20 16 12 10 8 / ( t 0 62.5 16 13 10 8 6 5 4 3.2 1 \ 50 20 16 12 10 8 6 5 4 Huyg-henian ii 41.65 24 19 14 12 10 7 6 4.8 Eyepieces i 111 31.25 32 26 19 16 13 10 8 6.4 * IV 25 40 32 24 20 16 12 10 8 ^ V 20.85 48 38 29 24 19 14 12 9.6 . ( sating- 7 Eyepieces / i \ 4 45 22 18 13 11 9 7 5.6 4.4 6 30 34 27 20 17 13 10 8.3 6.7 8 22.5 45 36 27 22 18 13 11.1 8.9 12 15 67 53 40 33 27 20 16.7 13.3 18 10 100 80 60 50 40 30 25 20 In addition to the Projection Eyepieces I, II and III which are specially constructed for Photomicrographic work, the Huyghenian Eyepieces 0, I and II will be found particularly useful. 26 Notes on illustrations The following 12 reproductions from negatives taken with the foregoing apparatus are inserted as a practical demonstration of the excellence of the results obtainable. The prints are on Bromaryt Paper manufactured by The Neue Photo- graphischen Gesellschaft, Berlin-Steglitz, which we can highly recommend for this class of work. Details as to magnification, illumination, and exposure, are as follows: No. 1. Spirochaeta pallida. Magnification X 1000. Objective 712“ oil immersion, Eyepiece No 4. Illumination — Liliput Arc-Lamp 4 amp ; darkground Condenser. Exposure — 5 seconds. Perorto plate. No. 2. Malaria. Magnification X 1080. Apochromatic Objective 2 m/m oil immersion, Compensating Ocular 8. Illumination — Liliput Arc Lamp 4 amp; darkground Condenser ; pale blue screen. Exposure — 10 seconds. Perorto plate. No. 3. Trypanosoma. Magnification X 1080. Apochromatic Objective 2 m/m oil immersion, Compensating Ocular 8. Illumination — Liliput Arc Lamp 4 amp; two-lens condenser, yellow- green screen. Exposure — 1 V2 minutes. Eosine-bathed plate. No. 4. Amphipleura pellueida. Magnification X 1150. Apochromatic Objective 2 m/m oil immersion, Compensating Ocular 4. Illumination — Liliput Arc Lamp 4 amp; Aplanatic Condenser, iris diaphragm closed to 1 m/m aperture and decentred ; deep blue screen. Exposure — 6 minutes. Perorto plate. No. 5. Anthrax. Magnification X 1080. Apochromatic Objective 2 m/m oil immersion Compensating Ocular 8. Illumination — Liliput Arc Lamp 4 amp; two-lens condenser, yellow screen. Exposure — 1 minute. Eosine-bathed plate. 27 No. 6. Meteorite. Magnification X 12. Objective No. 1, Eyepiece 0. Illumination — Daylight. Exposure — 5 seconds. Perorto plate. No. 7. Epithelium, degeneration. Magnification X 200. Objective No. 6, Eyepiece 0. Illumination — Liliput Arc Lamp 4 amp ; two-lens condenser, yellow screen. Exposure — 20 seconds. Eosin-bathed plate. No. 8. Palao Pikrite (Westerwald). Magnification X 60. Objective No. 3, Eyepiece 1. Illumination — - Daylight. Exposure — 30 seconds. Perorto plate. No. 9. Kidney of Rabbit (injected with Woot’s metal). Magnification X 24/a. Summar F/4.5, 120 m/m focal length. Illumination — Daylight; diaphragm 96. Exposure — 15 minutes. Perorto plate. No. 10. Bud of fraxinus, (transverse section). Magnification X 5x/2. Microsummar 42 m/m. Illumination — Liliput Arc Lamp 4 amp ; green screen. Exposure — 1 second. Eosine-bathed plate. No. 11. Philosoma. Magnification X 4. Microsummar 24 m/m. Illumination — Liliput Arc Lamp 4 amp; green screen. Exposure — D/4 seconds. Eosine-bathed plate. No. 12. Throat of Turtle. Magnification X 7. Microsummar 42 m/m. Illumination — Liliput Arc Lamp 4 amp ; green screen. Exposure — 3/4 second. Eosine-bathed plate. 28 12 *