DYNAMIC WAVE-HEIGHT RECORDER TYPE 286-1A by REI SESE a I ER IF EA I SS SR SE SIS F.B. Miller: STRUCTURAL MECHANICS e) INSTRUMENTATION DIVISION : \ RESEARCH AND DEVELOPMENT REPORT / PPLIED O35 HEMATICS August 1957 Report 1123 MES PRNC-TMB-6"8 (11-56) peo 0 ysinaniuinune joHM/ 18 DYNAMIC WAVE-HEIGHT RECORDER TYPE 286-1A by F.B. Miller August 1957 Report 1123 ' i » WES HDD AV eee ‘ , f i ’ ; ; o App ORe SER ny i { a hi TABLE OF CONTENTS Page ABSTRACT i. INTRODUCTION i PART I - DESIGN GENERAL GAGE CARRIER SYSTEM ADJUSTMENT BALANCING UNIT PART II - INSTALLATION, OPERATION, AND MAINTENANCE INSTALLATION OPERATION MAINTENANCE Nan w ww wo F W YH WH YH WNW PERSONNEL AND ACKNOWLEDGMENTS REFERENCES i \O aval De Moe ae | ; n | | oe aber outoy aa } ey, WL AM: Bibb Honma ‘Swormainsex a - op hen em ‘ WORTAATA rr: ‘ is “varrasi0ll 5 ee a " guvamna.rWoKADx aA im : >» ‘et © ae ni tf i " i 1 ‘ i 1 ‘t ’ ? i i i ‘ i i ou i + i el nn i ant! i : i i Figure Figure Figure Figure Figure Figure Figure Figure LIST OF ILLUSTRATIONS Wave-Height Recording Console Dynamic Wave-Height Recorder, TMB Type 286-1A, Top, Front, and Bottom Views Bridge Balancing Unit, TMB Type 286-2A Dynamic Wave-Height Recorder, TMB Type 286-1A, Schematic Diagram Bridge Balancing Unit, TMB Type 286-2A, Schematic Diagram Sanborn Company Driver Amplifier, Schematic Diagram Sanborn Company Power Supply, Schematic Diagram Sanborn Company Recorder, Interconnection Diagram aLatal Page Ii Le we 14 15 16 Ly 18 . soot ddatot aval on “2 warts Abd marine A bi sige rma who amnertats ARGOS seer Ch ai TE RUAN TeV vues wrodase ; a OIE SEE | pL Aatom oot neg te 4 ail xabibeeieh weak: sf ae tga as “ah vant Oe awe Nth St iene hey See y Pe nati alae. = ie rigsg ~ ah “2 AS: gone? a 4 ites Tha Be baer Lt sgh ims ik ~ merged Si rANeAOS ia a ae aia Sema yn iamctsertnds st ange * mnsaaesiog Sshia00n aut eppdeat, a suc bik cheat een ican ABSTRACT This report describes a dynamic wave-height recording system which utilizes an insulated wire probe as a eapacitance-type transducing element. The electronic portion of the system is designed as a plug-in component of a commercial direct-writing recorder console. The output of the system is in the form of a rectangular plot of wave height versus time. Schematic diagrams and operating instructions are included. INTRODUCTION In a facility engaged in ship hull design, the problems associated with the testing of the various models in waves dictate that some types of tests be made in waves of known and controlled dimensions. The waves desired for these tests may be produced by the various wavemakers available at the David Taylor Model Basin. It is desirable to be able to record these wave profiles and produce a permanent record for analysis and correlation with other data. Furthermore, such a record allows the wavemaker to be more easily adjusted to the desired condition. in earlier work, some wave profile recording was done by photographing a grid marked on one wall of the basin. As. the wall had an adverse effect on the wave shape, and as any imperfections in the wall surface further distorted the wave, the method left much to be desired. Also, the results were not available until after the film was developed. During 1952, the TMB Type 145-A Dynamic Wave-Height Recorder’ was designed and produced and has met with notable success in a number of tests since that time. This system exhibited excellent linearity characteristics, and the gage was easy to produce and simple to clean or replace when necessary. No photography was required, and the gage dimensions were small enough to cause little effect on the wave under investigation. In order to meet the needs of the expanding test programs of the Hydromechanics Laboratory, more channels of wave-height recording instrumentation were desired. In the meantime, a commercial direct-writing recording system featuring semimodular construction became available. It was decided to redesign the circuits of the older Type 145-A recorder and package the electronic portion in a plug-in chassis which could be used with the new recording console. All the desirable features + References are listed on page 19 oe if $i ‘ ; i aM wey ‘dinbhest or dag tal oy iw Sai ony ts Fi. ee Pap | oght Lar? Sire Sepa este bere Wedd te Rois ee sana “‘nOE drag’ Sho Poets > aft eta te sv two } a 2 TLS! A KOE oe aL | ; To tual 6a? Shaken tatty. daaekh evar Tc PPL Ay "Dap f ggrted ae a ee wry acts Af oh a ais Periods. Hie Me arth lo seeds omits: Rif Pebotans ta . eeetderg eas) ngtecoh Lion divp <), eames ade [lost # ° SOVEW wl olobow. evoluet ott lo saitewe See fete Se Wor “To hevay: it sana ad 4308) Te) epee eee yang # PRS See, NO. Caw ie: ateaw ar iO TRAM EL halle j o8d (3% Shuai Lays: puesta aR a: Ae Dees s eee ail.-G ay Pifees gen “Ab wf 712 GAG. Labow alga Banos PROBUS. A SAbReig Hee ow LL ie ay. STORY ears || ateh yor, titiw 70) 3a. ‘Bate ste nad wirl be aes! Shor Se. eS Swag wi, Wwoita Peery.’ : HOkS (brea pee): Sneh few oatiiooa: ¢ levy wyew Sie Pr rok aw SA ~eiae ty aid to [lew ene cad bere Bee ie ees te Re Dis Sens, ova Bre AG ui {18 seevha a ee Lg “CAF LSIVOaeL Sith "i entlsve | lew eas al Seerreeye Fiveey os /oaLe ber laed ac 62 Sem Piel tegtee s | ‘anew ke wee Saw. MELT ty oeest: Litre, side rheyay —" Pith A- Cel Set Ser aie Ree Ee sant oGiw tom £ ad be Seonde ay dda Seotesh wears MEPAVE Bod: kapha saris SOMES CLEA NO Weta a: 4 ee Dag Shiai saga Seen weed Lone yortia. a, atees ahs A gets at SGah eRe. Soh errgia Ae. Bi? Ded. es Dupes iw Ne oteuigg sen fi: i eri jects sleet SR was? Cr Rey: sis : i Leite. acaw ae oe AE LO Raye SE mit : pers, ae Kaige test srlhasgKe Bes) Wicepeary, ai see) 3. ‘val oa Inisai-evaw: Po, 2 fencsne CE a Wee PEA a Ae Lipa > ooh se 4 ROME. go) ae oh 2 Sono Bab 2 ae box SRS BW a i ss ane Bal pra Phars l notte id. tte ey Si O68 ZaK., Jslds iP eye. el a etd G2ewong | Bae 4 ak sgt ou ah eEOES wala beer ea Bis ib Save. Si see ai hula 2 ae ret Tt PiITHS IT < ies! oan. vee ~obvenae “phiiae ot we th ier ant i et oeed, Sais, Sle S68 eee i i ae si Hee, of the prototype were retained and several improvements contributing to simplicity of operation were incorporated in the new design. The calibration method has been simplified, as has the bridge balancing-null detection operation. The new units are known as TMB Type 286-1A and are used with the Sanborn driver amplifier“, power supply®, and recorder. PART DESIGN GENERAL The wave-height recording system consists of a gage, the associated electronic system, and the recorder. The gage is essentially a capacitive transducer, the capacity varying linearily with the water height. This gage is used ina capacitive bridge energized with a 10-ke carrier signal. The signal recovered from this bridge is demodulated in a phase-sensitive detector and further amplified. This signal is then fed to:the Sanborn driver amplifier and to the recording pens. GAGE The gage consists of a length of No. 28 enameled wire, Stretched taut, insulated from the water, and positioned vertically through the water surface. The conductor forms one plate of the capacitor, the water forms the other plate of the capacitor, and the enamel is the dielectric. Since the plate area formed by the water varies linearily with the height of the water (if the thickness of the enamel dielectric is uniform), the capacity of the gage is a linear function of the water height. The gage gives a large AC of about 50 uuf per inch of water. For a more complete discussion of the gage, see TMB Report 859, "An Electronic Wave-Height Measuring Apparatus." CARRIER SYSTEM Bridge drive is provided by a bootstrap oscillator and driver of fairly conventional design. This drive is link coupled into the bridge. Both the input and the output of the bridge are resonated at the carrier IIESCSIM\y, AWS, «8 high-drive voltage is obtained at a small outlay in power, and the bridge output is multiplied by the resonant output condition. Bridge output signal shifts 180 degrees in phase with change in direction of bridge unbalance. 2 Laat The bridge output is fed through an attenuator to a pair of cascaded voltage amplifier stages. The output of this second voltage amplifier is transformer coupled in push-pull into the modulator grids. The carrier is injected into these grids in parallel. The phase sense is recovered by this action. The signal is then fed to a demodulator and voltage amplifier, then to the Sanborn driver amplifier. The injected carrier is taken from the driver amplifier plate and fed to the injection point by means of a cathode follower. In order to detect bridge balance, a device to indicate bridge signal voltage is necessary. In this unit, this function is accomplished by removing the injected carrier from the modulator and disabling one side of the demodulator, leaving the other side as a straight amplifier. This removes the phase-sensitivity of the demodulator, and any signal present drives the recorder in one direction. It is then possible to balance the bridge, using the minimum recorder deflection as an indication of bridge balance. In order that the unit may be used with two or more gages by means of a multichannel balancing unit (for example, TMB Type 286-2A, shown in the circuit section of this manual), a switch is installed to disconnect the internal bridge balancing system. This allows the components in the multi- channel balancing unit to complete the bridge and supply the balancing function; see PART I, BALANCING UNIT, page 4, The front panel GAGE connector is paralleled by pins 6 and 9 of connector J-204 on the rear apron of the driver amplifier (9 is ground). Thus, it is possible to bring the gage cables into the rear of the unit rather than the front. When two or more carrier systems are used close to one another, the carrier oscillators may beat with each other and produce a cyclic variation in the output signal at the difference frequency of the individual oscillators. Provision has been made in the Type 286-1A for synchronizing the oscillators to avoid this undesirable effect. The positioning of the recording stylus is controllable from the front panel of the Type 286-1A. ADJUSTMENT The following adjustments are made as part of the construction and should remain fixed short of a major change in one of the associated components. 3 hy 4-4 ie as NS) rei 96! +4 ox rie mali Ants fay Raa IN Ay ne | ve rs Dice nee ‘ are es Se Gein water: tee ON ESD [eee 7/ RR aT ih ¥ ane 7 ilies ae oe ' ‘PR ON i? ie a / £15 et ee: ele i ‘ pang , py Wee ear Te Sa a MC oF A aS a pad es Saks ‘etude 3 aii bt ays ley ae Bid ee ; aa tty, Ait Swill je vt 4 we bay rand Oe ANS: hiihon (Giles ra Ws ie: ais The oscillator frequency determining elements and the bridge driver tank circuits are fixed-tuned and should require no attention. Should the frequencies of a number of these units be very different, it may not be possible to synchronize the oscillators. Should this problem arise, each of the oscillators should be set reasonably close to a 10-ke secondary frequency standard. Phasing of the unit is accomplished by a slight variation in the tuning of the bridge output. This is a broad adjust- ment and is not overly critical. The phasing adjustment should be made for maximum output with a slight capacitive unbalance in the bridge circuit. The bridge DRIVE (and injected carrier) is adjustable by means of a deck-mounted potentiometer. This control is used as a rough sensitivity control, with the front panel FINE SENSITIVITY control being effective over a range of about 10 percent of full scale. With the FINE SENSITIVITY control at about midposition, the DRIVE control on the deck should be adjusted until the full-scale deflection of the recording stylus is satisfactory for the use intended. An approximate full-scale signal may be secured by balancing the bridge, setting the SENSITIVITY control to the 4-inch-full- scale step, then rotating the O-0.001 ROUGH CAP. BALANCE control one step in either direction. This adds or subtracts 100 wuf in the gage arm, corresponding to approximately 2 inches change in the water level. The CAL. ADJ. allows the calibration step to be adjusted over a narrow range. It is intended that the calibration step be full scale on the 4-inch full-scale SENSITIVITY step. The CAL. ADJ. control should be adjusted until the calibration step corresponds to a 2-inch change in submersion of the gage while on the 4-inch full-scale SENSITIVITY step. In order to facilitate bench work on these units, the bridge components are chosen so that the unit may be balanced with no gage or cable comnected. In operation, more than 100 feet of RG 62/U coaxial cable can be used, as the system Will balance with more than 4000 uwuf of external capacity. BALANCING UNIT When it is desired to record wave heights from two gages with the same wave-height recorder, a TMB Type 286-2A Balancing Unit may be used to coupte the two gages to the Single recording unit, and the recorder may then be switched to either of the gages. The internal bridge balancing system Mm sy ; ot ed . sf en i | . i ae ey,” ib , —. gts) Rei Aarti heart ecretiprs eo earnien *eIas toad Rie Boe Wer t-Haek? one qateny ig Mead sess n fogieys SO, heros whary one Sites ower lieetss wh oP SIGRRGA Od 768 ‘Vow M1 .eeStS petes ae teva aid me lide Oe aL Fey ait! Se hora aoe Seéto: ' bat ays 4 Sy Dee A fuiihe) ipa fhoeowets Wy : biel se ee. Yrabhesess mp winge =i i! tants AWittya¢ 2? ie ar eae Witte RUL be: cev gt i) Lot: Aa “Be ho. Gea neti Reteanll wit Tek, 8! AM shh [ote fc: Prepon det aE 9 % (4S SD ee ce yieirzisn sehr ist. . neo etso.e!. bop) SPR eee o 4 a YT Pee Sty aki » ertten ) ready hati see: a ae Ha Tne ehh ey ant Sree ‘erly lp sense eee ag “0 ogee 4 aves ALS 24U LovdwadarTeIVi Tee Y eurdct, SO MaRORO Eas TS ee [ane JO) Oe diecneqegee 46a be 2 Sa TS? ah ; (4ooh im. WWoda ie wae chk |) eee 1 OREN cle. et Deo Sagat ie aa in BSE ye ih Say yan Lert ae) a) wii id #) mag vy uf Hotvses SH an lange > leew hEG? eee ; ity oe {7Hh5 LTTVISTARUS eit ees see ee AIH ra. BELO Bin id Vytie der wen (aes he me ahe CRT sme Witee(ll, “entre me Tare Sere E + 0) SARE ieydoxreo. ete Seep ey ae bi di tafe See ie oanead. af: 5 = y ae mG swolle .Wah ailw 4 a I i. Rie vg! Witt wWOY aos ° ie je: Tet sigon 3] ara { . Fiy racy real, tA SIT: a a Neg icsd ? je2vEs® qysa ifs b vr Vine a a ene ROS. THe i o RRA Oe Hb Siow, wooed st67hiibat oF Orel 5 | ip yale: Lrty Yao. Ga oe) Sat 1 Ai aon a? age) <2) SAP SIG i TO ee ae Jo dhe: Siege. tC) Sie 72 gs? Prete? ie Bey ae e Ce rengsotixsse Gi i iy oes tase 201 SO add" eaerieae tw ecgee lab LASSI iw DEGOS'’ y CE RSH RIVE ot e.: aM) oz GR aS GRETA ew RR Sark y a . ~ a i ‘ om. 18: She Tb Dit BO Pet rhAY - A ,-v : m yar ° cay wis vd oSew, aid DOR ¢ J na Y. al LB ee | , c ‘ : Se OG. PASI Te a, | eee ioe AR mie VBE he ; : re i 7 l : o- - 1 Ao } an of the recorder is then disconnected by means of the switch provided for this purpose, and the balancing function is taken over by two sets of similar components in the balancing unit. Two sets of the bridge-balancing components are necessary in order to achieve a balance on both gages simultaneously pecause of the different values of capacitance and dissipation associated with the individual gages. The balancing unit is pictured in Figure 3, with the corresponding schematic diagram in Figure 5. PART II INSTALLATION, OPERATION, AND MAINTENANCE INSTALLATION Installation of the Type 286-1A unit is similar to the Type 145-A. The gage is positioned through the resting surface of the water and clamped in this position. Approxi- mately half of the gage should be immersed in the water. The gage is then connected to the wave-height recorder by means of any good quality coaxial cable. As the Type 286-1A is used in the Sanborn console, the connections to the unit are automatically made when the unit is placed in the rack. The connections between the driver amplifier, power supply, and recorder are already made by plug-in cables* inside the rack and should offer no problems. Should it be desired to use two gages with a single Type 286-1A unit, a bridge balancing unit, Type 286-2A, may be used to properly couple to the two gages. The internal bridge balancing controls must be switched out of the system by means of the INT-EXT deck switch in the Type 286-1A. The GAGE connector and the two gage cables are then connected to the bridge balancing unit. The functions of the ROUGH CAP BALANCE, CAP. BALANCE, and RES. BALANCE on the Type 286-1A are then taken over by corresponding controls in the bridge balancing unit. The gages are each balanced in turn in the same manner as described in the next section. It is then possible to record from either gage as desired. OPERATION Before use, the system should be connected to the power line, turned on and allowed to come to operating temperature. The direct-coupled amplifiers in the system may be expected to drift during this period. A warm-up time of approximately 15 minutes should be allowed before measurements are made. 5) HO. tea baetiy: brs t's a8 ‘Side * a es ois B49 wie eae . Badu tp i aoeiee ‘aiid Nee abet nea orang Ae Be Oban | bere: acioae ted is tl Viashe ren’ OTe i Ree ate Conus th Fk a Naa 9 t! antsne \ fa Kt Shae te fot Pek ea ee io “BRAT ak ae gars nk Pee: ey i Ta aes impor At COE Ae URS |) een ean i tb Aiba a4 AR AOe eT gle eae L ie tt NIRS eae ESLE OE ge Co a Te Mg EROWERA cei ot oot Re peas Ce eae eat. oh See aey Evia frat it By, Peet by Ba ¢ ener Se omy te * 1 - ue ei. Pere tay oy beim mney By Sw aia? ae irews Nex ; Ont & RAO. oct. Soh ws oelies eh Seay ei eee Li ee Sat bo Acro 00 NG Siiy*., 6 Ue rye, ec? oy Sipe Cle ott asc ohm ei igs tye ihe era eae eid ia sais assed | andtyss ‘ FAS 5's ve ey ui SM Eee sea Rh ty “vbwete wis tom ‘ p eth Lidell: SNe sa hdl Girone 2 BPR Bc De ye: Eo ee CL of. naa ‘en oy ‘big VA: pL mS: ocpie 9 PRR MME ole oe et: yeaa aes oko Afs ol Rita i Tate Ving Y rh ty an hy Bais ; > LEO 4 fa iy Ham Ci eh may Gh RAGS Aree pare: We my Wen te ed ih Carnes ao ronal : “ a ie a fA hein at eT es a sled VALS The UU T tte ae ; Wy aire HA BOLE AS) Er th: COWNLT ey be PS ; ariel sani ant . + Lin eae aad be RD oH etx BOARAAR, Leh . reas ee ee: ove voted: ; 1 i f ae it r ; 0 +7 jaa CP aw peo oy BE fe eae Sere eisied AB ee oe yeh pe cuts om 1 Va aa ay Mg oer i uo PORN Carl ae With the water still, the unit may be balanced by depressing the OPERATE-BALANCE switch and advancing the SENSITIVITY control as far as possible with the recording stylus remaining on the paper. Then the CAP. BALANCE and RES. BALANCE are alternately adjusted to obtain a minimum indication on the recorder. The SENSITIVITY is then advanced and the process repeated. This operation is repeated until a null indication is obtained on the 0.6-inch full-scale SENSITIVITY step. The OPERATE-BALANCE switch is then released. The SENSITIVITY control is then rotated back to OFF and the position to which the stylus shifts is noted. The SENSITIVITY control is then rotated back to the 0.6- inch full-scale step, and the CAP. BALANCE control (or controls, if necessary) rotated until the stylus shifts to the same position to which it moved when the SENSITIVITY control was placed in the OFF position. The stylus will then be found to stay in the same place when the SENSITIVITY control is rotated, provided that the bridge remains in balance. The SENSITIVITY control is then placed on the desired step and the stylus positioned to the center of the paper (or to the desired zero position) by means of the STYLUS POSITION control. in calibrating the system, the SENSITIVITY control should be turned to the 4-ineh full-scale step. This is because the calibration built into the unit represents a change in water depth of approximately 2 inches in each direction, or a total of 4 inches. After calibration, the SENSITIVITY control may be returned to the desired position. The system is then ready for use. MAINTENANCE The electrical components in the Type 286-1A Dynamic Wave-Height Recorder are all operated well within their ratings and should give very little trouble. The console has a blower for cooling. Cables should not be walked upon nor permitted to Stay in the water. The gage should be cleaned occasionally with a soft cloth. This is necessary to remove the foreign matter that collects on the wire. Holes in the enamel have the effect of a leaky dielectric and prevent the proper balancing of the bridge. These holes will seldom be found in a new wire, but will sometimes develop after use. In the extreme case, they are evidenced by the inability to reach a resistance balance of the bridge. 6 i a a In the event of a damaged wire, a new length of No. 28 enameled wire should be installed. It is of interest to note that ordinary Belden enameled wire has proven more satisfactory than the more expensive types now on the market. The new wire should be fitted with a bayonet-type fastening on the lower end and must be cleaned and soldered in place at the upper end. In preparing new wires, it is generally more economical to discard the old bayonet fitting and drill a new one from 1/4 inch diameter bakelite rod than to attempt VOMGCUSCmUNCmboyOneL devalcea LMe Ware. husecllials complevelny insulated from the water with automotive windshield sealing compound or the equivalent. With the gage properly positioned in the water, a d-c resistance measurement of less than 20 megohms indicates a questionable gage. Because adjustment of the phasing of the unit is not normally expected to change, the phasing procedure is included under PART I, ADJUSTMENT. PERSONNEL AND ACKNOWLEDGMENTS The general design of the instrumentation described in this report was the work of Mr. R.G. Tuckerman of the Instrumentation Division. The detail design and final adjustment and testing of the equipment was the work of the author, also of the Instrumentation Division. g feet Fae iy nent Bt r iM ‘ oO pehte abe so Le oe iia 334 op ub CONDI FWMH Wabi \ WO LoS Ree es tle el DAADDAADAAD 2290 PARTS LIST FOR DYNAMIC WAVE HEIGHT RECORDER DIMB TYPE 286-1A OoLO jut 0.01 uf 140 put O20voIl ie 0.005 uf 3900 uf approx. 68 wut OPO Let 2400 uuf approx. 0.001 pf 1200 uur approx. 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Fon (Sal8-M) 238 -ZOEIL aomemes zy 3 ~>H91918-4-m) —— S| 2 > (94 18) 23s-zZoeIL bee QB) <>] 40-M) aoEie 9 > (48-8O-M) 3-110 (18-YO-M) 4-10EIF 58 Se ja “eas inasd ; 3 (ek 10-m) 238-208: WZOEIL © 2-1001L (M91 3 8 > os >= O'-10€Id (d-¥O-M) lez TL s >| > 01518-¥-w) (18-u9-M) d-locir. g << J) e>7 (91418) 938-20. mS Ed >* © > 3 te reeM)mclosir: 6-l0S1d @ I-1OELL 18-¥9-M S te) (49-8 -A) 9-10¢Ir 9N1QN9-90E11 (8) a) bo) (48-A) H-10EIF 210814 (915M) wod Sil E} AL1OEI4 (91,8-M) "HE | OH Sil (48) 7-H08Ir 90611 (Y-eM) ° 3 €-SOEI (78-HD-M) wentpy © (91518) 93S-2OEIL POEL (7B-A-M) 40400 > 3 ie SEOEILd78-m) SOIKbS ty oy RB (8-8-M) 0-10) \-Z0€18 (18-4) So <3 1 6t8-¥ - 2-GOEIP (18-49-M) 26 (91078) 226-zogiL fgocir (YO-M) gr & {d-¥9-M) 1-108 (p-)N-1OEIr =a (8-89-A)A-10EIF (418-4 )2-10EId: (9]g18- ) 23S -ZOEIL (@-m) 9-1081r [rtd A“) HOGI SO A BC tot < « é (91,18-U-M) (91518) 93S-2OClL © #-10c19 (9-wo-m) aE eM) Loe (91g -M)M-10€ I (ua-wo-m) (7a-49-M) I-zosie toe oPp« (91, 8-M)S-108Id “ 2Ss MARKER ASSY 18 REFERENCES ale, Campbell, W.S., "An Electronic Wave-Height Measuring Apparatus," TMB Report 859, October 1953. 2. Sanborn Driver Amplifier Schematic, from Driver Amplifier Model 150-200B Replacement Parts List, Sanborn Company, Cambridge, Mass. (Reproduced as Figure 6 of this report. ) Bs Sanborn Power Supply Schematic, from 60 Cycle Power Supply Model 150-400 Replacement Parts List, Sanborn Company, Cambridge, Mass. (Reproduced as Figure 7 of this report. ) iB Sanborn Recorder Interconnection Diagram, from Four Channel Recorder Model 154-100B Replacement Parts List, Sanborn Company, Cambridge, Mass. (Reproduced as Figure 8 of this report. ) 19 samba ok ae ee antl otamidos tg oat hy B. tf Lode er 2 A ER aster aO) aie ‘irsoasr ane cy De are an ieimartiat area rips cil, ein feat tes thd edagee sneness Gok TOeQe |, eben eh ios ae Decmeedsh ) j ‘AGEN enmaee a at Sed: BLO OR meeee’S ,Oftemetoas v4 aut anno! Snide : EHOW PIOUS fehl Bret Qoomahatear: Ones: {stom fusyoy mht ToT) ae ee Haas orgety iP esantd 158 LO mor} rer: Hortvesnhiour; st et “i ‘abseaell ait (tig Ee SS TA9 TASMSHHLGGH “AOOL-HS1- (2am fo ee 2 5 Ohhh a8 be de chieditte: BOOM cree, Pridintatsh * Ulsecas fi 1 { We 5 iJ ii — uy \ i a i, LM i i f x) in Copies INITIAL DISTRIBUTION Chief, Bureau of Ships, Technical Library (Code BLD) De helchiacialle loaner, 1 Applied Science Branch (Code 370) 1 Special Devices Section (Code 851) 1 Technical Assistant to Chief of the Bureau (Code 106) Chief of Naval Research Director, U.S. Naval Research Laboratory, Washington 20, D.C. Commanding Officer and Director, Naval Electronics Laboratory, San Diego 52, California Commander, U.S. Naval Ordnance Laboratory, White Oak, Silver Spring 19, Maryland Commanding Officer and Director, U.S. Navy Underwater Sound Laboratory, Fort Trumbull, New London, Conn., Attention Mr. Whannel Commander, Norfolk Naval Shipyard (Code 227), Underwater Explosion Research Field Unit, Norfolk, Va. Director, National Bureau of Standards, Washington, D.C. Director, U.S. Coast and Geodetic Survey, Department of Commerce, Washington, D.C. Beach Erosion Board, U.S. Army Engineers, Little Falls Read and MacArthur Blvd., N.W., Washington, D.C. Director, Experimental Towing Tank, Stevens Institute of Technology, 711 Hudson St., Hoboken, N.J. Director, Woods Hole Oceanographic Institution, Woods Hole, Mass. Director, St. Anthony Falls Hydraulic Laboratory, University of Minnesota, Minneapolis, Minn. Dr. Per Bruun, College of Engr., Univ. of Florida, Gainesville, Fla. 20 — et sores an WOLTORIATAT Wha OA CRA ‘a at eich heer Cy ae : " E . pay ey , Sn ae a ai ‘erent Det “hte deat! F : a siete 8k SA ie cs bar. : WOLSISe Aaa eee ebmeae. F STH: Wit Ie VWI AF. Seate lean ks tee! - Z 28% ne be Toke t at) are ee a4 ¥ hed \ - J : ; ve m ~ P , 7 of ee a Esk! tet: Be Ov kh Aeon Bf Lay vail , as Ht | tetnaeks rt ie Ane Ree te Det OSs cata Steen + BrD ith ee, a 1 LAVEH (tOVO ine bite ieattie ro phanent ; (. SRNOTI Ley) Se age tt iat Didintiaeiaanl i He Oterscdad ‘soverhtoO’ Tavek ine wu “Rebnee | ae chgl IMBLEIOM. VOCS Bel are Le bh SOPOT) bee pep ES Bee ae | 4 a teen signed wea, liecmiach? oF oii Li tdal Sygee 5, oo 4 : a eee ts 2 a Se roreageh: ny . ‘ | 0 1) Drayhlls Level vlerwel crheabetibeaatien ci &V ys oP oe 5) OL” See) CTT a Lee ah tea pale sine ste cg Ta ca si) ber TAS ww 5 at? Ey peoium (areal Sa: = i an vy bt % iW ‘ ; oe i es Ores SHo@. 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