military searchlights (1912)

8/22/2019 Military Searchlights (1912)

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ARTILLERY NOTESNo. 32

SEARCHLIGHTS(Hrvision of Artillery Note No. ~1)

PUBLISHED t)"J\:DER SUPERvISION OF THE

SCHOOL BOARDCOAST ARTILLERY SCHOOL

PREPARED IN DEPARTMENT OF

ENGINEERING AND :\HNE DEFENSECOAST ARTILLERY SCHOOl.

Fort Monroe. Virg in iaCOAST ARTILI.ERY SCHOOL PRESS

1912


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TABLE OF CONTENTS

PART I.(Pages 1 to Zl.)

TYPES OF SEARCHLIGHT PREVIOUS TO MODEL 1910.

Parts. : Electrical Control and Training System. Controller.. -TrainingMechanism. Hand Training. The Arc.PART II.

(Pages ~8 to 70.)GENERAL ELECTRIC 60-INCII PROJECTOR.

Methods of Control. The Training System. The Lamp.Occulting. Rheostat. Switchboard. Tools and SpareParts. Nomenclature of Parts: Projector, elevatingmechanism, lamp, pilot motor, focusing carriage, train-ing and elevating motors, controller, couplings, contactplungers, miscellaneous, spare parts and tools not illus-trated, rheostat.

PART III.(Pages 71 to 74.)

CARE AND PRESERVATION, TRANSPORTATION AND NOTES.

Care .and Preservation. Transporta tion.APPENDIX.(Pages 75to 81.)

Notes.

PORTABLE SEARCHLIGHT SET.

Portable Searchlight Set. Searchlight Truck.Power Plant Truck.PRESENT STATUS OF THE SERIES OF ARTILLERY NOTES.

(Page 82.)


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~ILLUSTRATIONS1. 6o-Inch Projector and Controller.2. Diagrammatic Sketch of Searchlight Lamp, Early Type. ,3. Searchlight Lamp.4. Parts of 6o-Inch Lamp l\lechanism.5. 7-\Vire Controller.6. Sketch of 7-\Yire Controller Circuits.7. Connections in Detail for 6-\Vire Controller.8. 9-\Vire Controller.9, Sketch of Circuits for 9-Wire Controller.10. Connections of Electric Control nnd Training Mechanism. 9-Wire Type.11. Connections of Electric Control and Training Mechanism. 8-Wire Type.12. Diagram of Improved Electric Control System for Sea'rchlights.12a. Front View of LenIanc Searchlight Controller ..12b. Rear View of LeBlanc Searchlight Controller.13. Vertical Section of Training Mechanism, 9-\Vire Type.14. Training Mechanism. 6-Wire Type.15. Training Mechanism. 7-Wire Type.16. Sketch of Horizontal Training Mechanism, 9-Wire Type~17. Sketch of Horizontal Training :Mechanism. 8-Wire Typt".18. Mechanism for Horizontal Training, 8-Wire Type.19. Old Type Projector ancl Controller. 7-Wire.20. Old Style Projector and Controller. 6-\Vire.21. Carbon Showing Crater in the Positive.6o-Inch G. E. Projector. Frontispiece to Part II.22. Vertical Training l\lech:mism.23 .. Section of Elevating l\lechanism. ,2.1. Section of Training and Elevatin~ Mechani~m.25. Lower Side of Lamp.26. Rheostat.27. Switchboard and Rheostat Wiring.28. Connections of Switchboard anel Tlheostat.29. Pilot Motor Connections.30. Connections of Electric Projectors, 6o-Inch Form N-2.31. Top View of Connections. .32. Connections to Trainin~ nnd Elevating Mechnnism Roxe!433. Barrel Crated.34. Base Crated.35. Projector.36. Projector.37. Parts of Lamp.38. Parts of Lamp.39. Parts of Pilot Motor.40. Parts of Focusing Carriage.41. Parts of Training and Elevating Motors.12; ..:Parb of Controller.43. Parts of Courlings.44. Plungers. Connectors anel AdJusting Hod.4j. Portable 36-lnch Light.46. Portable Power Plant for 36-lnch Light.17. Portnhlt" Pow ..r Plant for 3R-Tnch Li~ht..'

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PART I.

TYPES OF SEARCHLIGHTPREVIOUS TO

MODEL 1910

Illustrations from A rtillery Note No. 3 I


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1'1'. t,( Illch ProJtl!ol


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3PARTS

The principal parts of a searchlight are: A reflector, abarrel, a glass front door, arms for supporting the barrel, a turn-table for enabling the barrel to be revolved in azimuth, a basefor supporting the turntable, training mechanism for changingthe directidn of the beam in altitude and azimuth, and an arclamp for supplying the light. (See Fig. 1.)

The reflector used almost universally is a parabolic glass silver-backed mirror. An arc is maintained at the focus of the reflectorand a beam with the rays essentially parallel is projected from it.Searchlights are designated by the diameters in inches of thereflectors. Those in the Coast Artillery service are: 2.1-inch,30-inch, 3G-inch and GO-inch. The first two are obsolete typesbut several of them are still in use.

Metallic mirrors, gold-plated, silver-plated,. nickel-plated,and of Monel metal, have been experi~ented \vith and some havebeen issued, but all of them are markedly inferior as reflectorsto the silver-backed glass mirror.The barrel is a metallic cylinder carrying on the back thereflector, on the front a glass door, and on the bottom a lampbox for supporting the lamp and a rack for changing the directionof the beam in altitude. It is supported by the arms, \vhich arefastened to the turntable; the latter is mounted on the ba..o;;eand is moved by horizontal traversing mechanism to changethe direction of the beam in azimuth.The gla.o;;sront door consists of a metal ring on which aremounted strips of glass. The only function of this door is clos:.

ing the front of the drum. .The parts mentioned above are essentially the same forall types of searchlight, the different types resulting from differ-ences in the lamp mechanism, training mechanism, and appa-ratus for controlling the training mechanism. .The lamp consists essentially of a pair of carbon-holders,mechanism for starting the arc, mechanism for feeding the carbonsso as to maintain the arc properly. Starting the arc and feeding Ithe 'carbons may pe. accomplished automatically, or by hand,the mechanism for the purpose consi~ting of .~lectromagnets;feed-screws, pawl, and~ ratchet wheel, as shown ..diagr~mmatic-ally in Fig. 2. . . . ,':,The upper feed-screw has a little longitudinal play. ~':-U~a.t~it. with the negative carbon-holder may be moved a short di~:-:~,tnrice by the armature of the starting magnet; both carbon ...

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4holders are moved when the feed-screws are turned by mean~of the ratchet wheel.

The actions in starting the arc and feeding the carbons areas follow: The carbons being apart, power is supplied to thelight, whereupon the feeding magnet attracts it~ armature,cau ing the pawl to move the ratchet wheel a notch, thus mov-ing the carbons slightly together; the circuit is broken by

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F1S?' l. DIA rammatic Sketch of archlight Lamp, Early Typthis movem nt, th :pring withdraws the armature, disen~aginghe pawl frolll the ra.tchet wheel and again closing the circuit;thL, in urn, ('au: ... the p~t\\I to engag the ratchet whe I againand mo -e it another note-h. Each repetition of this proces.bring 1,h carbon. clospr and ('loser tog "her and when theytouch, th . tarting magnet atLrads an armature which with-rlra . 1h n Rative carhon-holder, and an arc is form fl. The'

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Adjusting-spring for feeding-magnet.

Adjusting-screw for ratchet and arm.Starting-magnet.Fepding-magnet.

7spring of, the armature of the feeding magnet is adjusted sothat the current through the magnet due to the proper voltageacross the arc wiII give a current producing an attractive forcein equilibrium with that of the spring. If the voltage acrossthe arc is too small, (arc too short), the spring wiII keep the feedmagnet circuit broken and the arc will become the proper lengthby burning of the carbons.

If the voltage across the arc becomes too great (arc toolong), the current through the f('ed magnet wiII overcome theaction of the spring and the carbons will be fed together. .Thearc is kept at the focus of the mirror by moving the lamp with ahand feed-screw not shown in figure.

Fig. :1 shows a type of lamp for the :1G-inch and smallerlights. The parts of this lamp are:

A. Negative carbon-holder.B. Positive carbon-holder.C. Clamping-screws for carbon clamps.D. Vertical adjusting-screw for positive carbon.

Horizontal adjusting-~.wrew for positive carbon.Negative carbon-support.Positive carbon-support.

H. Lamp frame.K. Main lamp-contact shoe.

Hand feed-screw.M. Fixed nut for focusing-screw.N. Stud of lamp switch for cutting out feed ma..,.{net.O. Ratchet and pawl.P. Feeding-magnet armature.Q. Contact of circuit-breaker.R.S.T.U.

Fig. 4 shows the parts of the lamp for type of GO-inch lightprevious to Model l!)}O (Type N-2, G. E. Co.).


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8ELEC'TRIC Co TROL AND TRAINING SYSTEM

CONTROLLERThe electric training mechanism consists of sets of gears

actuated by two motors whose power is supplied through a pieceof apparatus called the controller. One motor with its gearsmove' the light in altitude, the other in azimuth. With the

Fi~. 5. 7-Wire Controller.

olde. t type of controller, th' armatur' current passes throughthe controller, the fi leis for the motors being in series acrossthe Plain:: of thi .. t~.J)l' of cont roll 'I' there are two classes, 7-wireand fi-wir'. the latter b'ing t he later type. 'I'h' G-wir modelWW' repla(' cI h~ what is kno\ n as the relay type, in which thearmatur curl' nt doe not pass through the controller. Of


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9this type there are two classes, 9-wire and 8-wire, the latterbeing the later type. The latest t:rpe for l\Iode11910 (N, G.E.Co.)is described in Part II. The classes 7- and 6-, 9- and 8-wireare based upon the number of conductors in the controllingcable.When the controller handle is in its normal or neutral posi-tion the motor armature is short-circuited. If the fields are+ ..horizontal 'JjU/nI'?j Co.7tacf

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Fi~. 6. Sketch of 7-Wire Controller Circuits.

energized under this condition and the turntable rotated, themotor will act as a short-circuited generator and offer greatresistance to the motion, thus acting as an electric brake. Thisis true for all types of electric controller. \Vith some types ofcontroller the handle flies back automatically to this normalposition when a turning force is removed; with others it remainsin any position to which it may have been turned.

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10The electric circuits for the 7- and 6-wire controllers areshown in Figs. 6, and 7.Referring to Fig. 6, horizontal training side, it will be seenthat each of the motor leads has two terminals, one of which maybe thrown in contact with the positive main and the other with

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Rheostat

the negative main; and, further, that five taps to a resistance areindicated. \Vhen the controller handle is turned, contacts Aand B or C and D are made, depending upon the direction 'ofthe turning; portions of the resistance are cut out from the cir-cuit depending upon the tap point at which a contact finger

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12operated by the handle is stopped. As there are five suchstops it is possible to vary the resistance in the armature circuit. \, I

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131\. (or C). I, motor, ~. H, (or I>I. IO \\(, 't tap of t\1(' I'r.'i.'LIIH'l',111:1ll.

H,v 1I100'ing thl' handll' up and dm n tlH' :\('t ion of tIH' \ l'l'-(i(':11 (I':lilling motol' i.' .'imilal' to that of tll


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16


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17

in parallel wit h t hr rr. i:t anrr (B) in th(' motor armature circuit.Variations in :plrd are ohtainr

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1 1l1l111ller of I ' '. i. 1; nr' ar} upplied \\ ith 111(' contro\lrr.111


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18TRAINING MECHANISM

The training mechanism actuated by the motors has beendeveloped along with the controllers, the various types usedbeing shown in Figs. 13, 14, 15, 16, 17 and 18. The mechanismfor the 6- and 7-wire types are shown in Figs. 14 and 15. An ..this mechanism is beneath the turntable and very inaccessible.The mechanism for the 9-wire controller is shown in Fig. 13.

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Fig. 13. Vertical~Section of Training Mechanism, 9-Wfre Type.A. Clutches and mechanism for horizontal trainin~.B. Shaft for hand horizontal training. .C. Turntable roller ring.D. Standard.E. Horizontal motion gear-wheel.F. Clutch for vertical training mechanism.G. Reduction gear-wheels for vertical training.H. Turntable gear-wheel for horizontal motion.I. Turntable.J. Bevelled ~ears for vertical training.

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K, \' C'rt ical t rammg motorL. Horizontal t raininl.! motor.M, Pedest a!.

For \'C'rt ical t ,.aining. motion i.' tran ..mit t I,d from th \'er.tical t raining mot ')1' to t h


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20and either of the gear-train~ may be operated by either speed,the turntable may be given four speeds in a horizontal direction.The operation of putting either gear-train in motion may heunder toad by reference to Fig. 16.The electromagnets A and J are fastened to a shaft whichi.. actuated by the worm D on the motor shaft. When clutchi energized the armature B causes the train of gears terminat~

ing in 0 to be revolved. 0 is fastened to the shaft P, which

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Fig. 15. Training Mechanism, 7-Wire Type.

('aITi '. a rear for a tuating the turntable. 1n a similar manner,when J i. en rgized the armaLlir I revolves with it and causesa moLion of the Lrain of gears tl'lTninating in L, which actuate.the turntahle through the shaft P, to which it is key d. Thesetwo gear .. are d 'signed to givC' Lh proper spe'd in connectionwith the two motor'p cis.The ('!utrh.. ;11'(' en('rgiz('


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21The vertical training mechanism designed for use in con-nection with the 8-\\'ire controller is the same as that for the 9-wire. The motor shaft has a worm meshing into a worm-gearon whose shaft there is a bevelled gear meshing with a gear on ashaft containing the vertical rack pinion. The pinion receives

power from the shaft through a spring clutch.

P/I and J = E/l1cfrom0!7nt!"t$. 0" Worm "" n7otor shQ'~/ aha! B. /lrmatvr~s. p:l ~r"tab/t" !It'ar/ng shQ~t.

Fig. 16. Sketch of Horizontal Training Mechanism in 9-Wire Type.

Fig. 17. Sketch of Horizontal Training Mechanism, 8-Wire Type .

.for horizontal training, there are two speeds of the motor;the gearing is arranged as described below, so that for each motorspeed two speeds of turntable are possible; so that there arefour speeds in each horizontal direction. One of the gear-:rainsin this case is direct, the other is differential; the former gives aspeed fifteen times that of the latter. The selection of the gear-


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train is made by mean: of a single electromagnetis clutch, asexplained below. The horizontal training mechanism is shownin Fig . 17 and 1oft. The hard core is as hard as the carbon proper and is heldin place by a carbon selvage not so hard. The soft core is madesofter than the carbon proper. Cores are provided for thefollowing purposes. .1. Centering the arc.2. Increasing the length of the arc so as to expose as muchof the crater as possible to the reflector.3. Causing the crater to cup in such a way as to givebest illumination.


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Fig. 19. Old Type Projector and Controller, 7-Wirl'A. Hand. tar wheel for ~low V('rtical trainin~ (hand control),B Clamp nut for horizontal trainin~ clutch nul.C. Hand whel'l for ,'low horizontal trainin~ (hand eont,)'ol).U. ...ut for horizontal trainin~ elutch.Eo \\ (lod handl(',' for liuic\' hand contra\.F. Cluteh for throwin~ out \'I'r!.ical trainin~ rT)l'chanism for hand control.(;. ConLroll-r ,'\\ itch.II. ConLroll(-r hand II'.I. ConLro]1pr fu,'(' block:-;.J. Plug r('('l-p leiI' for conlroll(>r eahll'.K Foeu 'ing ,'crl'\\' for brin~in~ rays of lll'am sl'nsibly paralle\.L. .'ockpt for in.'l'rtin~ \\Tl'n(.h for opl'rating f{'pd ma~n .j, Hwitch .. t. .'ockPt for in,'l'rling \\1'('neh for f('l'ding lamp by liand.

, Q . .'liding door,' U.'I'.1 for adjustin~ lamp and el('anill~ mirror and frontdoor.


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FIg. 20. Old tyle Projector and Controller, 6-Wire

Shaft for. lo\\ VI.rt ical nwchaIlIcal tra1l11l1g";c("('ntric for t hrc)\\ in~ out horizontal training 'I'ar.Shaft for ,'lo\\ horizontal m, chanical trainin~.( lutch for throwing out \ l'rti(':t1 training nw('hani. III lorquick hand controlMain lall1p ,witch.('onlrollt.r handit ..('ontrolll'r fu, I' Illock.({I'('l'pt.al'11' for ('ontrulll'r cabll' cuupling!{l'('('plaelp for main liIH' cahll' ('ouplin~.1{1'('I'ptaelc' for mot I' \ in',Sidl' Jl('Pp-. i~ht.V('rl i('al P('('p-. ight for ob.-('n illg imagl' 01 craterSo('kl'l, for in.'l'rtill' H,.nci1 for f((.din r lamp h~ hanc!.FlH'u.'ing .'cn'\\.SlJ('lt.t for in.'t'rting wn'!wh to Opl ratl' f('I.


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1f the positve core is too soft the crater will be Loo deep,with consequent loss of light. Furthermore, cracks develop.With hard-core carbons the selvage often burns out around thecore cau'ing evere cracks. The development of cracks is fatalto the proper burning of the carbon; cracking is always accom-panied by fier.;e hissing and screaming, large pieces of the carbonfalling off eventllall~' and ruining the arc. As soon as crack I"develop re-carbon, especially if they develop soon after starting.In earchlight operation more trouble results from poor carbonsthan from all other defeeLs together.

Carbons are, upplied in ealed boxes which should not beopened until the carbons are required for use. Carbons whichhave been e.'posed to the :-IiI' for any length of time are much

r l~, 21, Carbons Showing Crater in the Positivtl,impw\'


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The important characteristic is the current and every pre-caution should be taken to keep it constant. After tryingseveral special types of generator it has been found that theordinary 110-volt compound wound generator and a resistancein series with the arc give by far the best current control. Thelatest arrangement is sho\\-n in figure on next page. Ammeterand voltmeter are necessary at the light in order that the attendantmay operate it intelligently.

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60-Inch G. E. Projector.


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PART II.

SEARCHLIGHT, SWITCHBOARD,CONTROLLER

AND TRAINING MECHANISMMODEL 1910

Projector : Type EC. F onn N-2. Oa5S 60-10. General Electric Co.

Extracted from General Electric Co. InstructionBook, No. 84/3, July, /9/0


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30METHODS OF CONTROL

Electric.-This projector is equipped with a synchronoustype of control; that is; the movement of the beam in boththe horizontal and the vertical planes follows the movementsof the controller hand wheels, the rate of travel of the projectorbeam being proportionate to the speed of rotation of the con-troller handwheels. This is explained below.Hand.-A clutch is provided on the training and elevatinghandwheels, so that the control may be changed from electric ,to hand control by pulling the vertical handwheel 21 (Fig. 35)and the horizontal clutch 50 (Fig. 36) outward toward the opera-tor. It will be noted that a part of the clutch for the verticalmechanism is formed by the hub of the handwheel 21. The pro-jector is then operatoo 1Jy means 'of the handwheels 20 and 21.Free.-By throwing the clutches 21 and 50 out of engage-ment, the electric control gear is disconnected and the beammay be moved f~eely, in both horizontal and vertical planesby grasping the barrel and one of the arms.

THE TRAINING SYSTEM , .TheController.-The controller, Fig. 42, is provided with twohandwheels, parts 322 and 323, for the purpose of training theprojector electrically; one in altitude, the other in azimuth.These handwheels rotate shafts on which are mounted simplecurrent changing devices (contact cylinders, part 353), by meansof which the direction of current through leads Nos. 1, 2 and 3(Fig. 29) of the pilot motor is made to change according to thetable (Fig. 29). On each of these current changing devices orcontact cyHnder.s Jive ~ontact fingers rub; one plus finger, oneminus finger arld'thre'e plIot motor fingers connected respectivelyto leads Nos. 1, 2 and 3 of the pilot motor.Geared to the horizontal training handwheel is a graduatedazimuth circle, part 362, showing through an opening in thecover of the controller and illuminated by a small lamp. Thisazimuth circle revolves with the horizontal handwheel of thecontroller and consequently, as will be explained, with the pro-jector beam, indicating the number of degrees through whichthe beam ..has.,moved. _'.., .. ,The Pilot -AJolor.'.-.:.':'Referriilgo. 'Figs. 22, 29 and 39;~it willbe seen that the pilot motor, part 63, consists of six stationaryarmature pole pieces, part 249, on each of which are mountedtwo coils, part 229, which will be referred to as the armaturecoils. The armature poles are arranged on the circumference


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of a elrel m:idp of which i.' placed a movable field, part 24 , thep eiting ('oil., p.ui ~2('. for the field bing connect d in erie.across tlw training ('irnlit. a :ho\\"n in Fig. H. Br l' ferring toI~'igs.~!) and :W . it will h . en that the ann. turf' coil: on each1'01(' pit'(.p art' connr('(prent polppiccps hping int '/'{'onlw


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32in the controller, the current is caused to enter the pilot motorfrom the positive side of the circuit through leads Nos. 1 and 2,passing out through lead No.3 to the negative side of the circuit,the movable field will advance one-twelfth of a revolution. Itwill thus be seen that different current combinations through,the pilot motor will cause the field of the pilot motor to rotateThe successive current combinations, polarity of armature polesand positions of revolving fields are shown in the table, Fig. 29.Fig. 29 also shows the method of testing each individual"armature spool, the series connection of two spools on each 11Iannature pole for the proper polarity of armature pole and the,method of interconnecting the six pairs of armature spools. .

Operation.-Referring to Figs. 22,23, 24 and 39, the opera",tion of the elevating mechanism will be described. Rotatingthe elevating handwheel of the controller through two-thirdSof a revolution causes the revolving field, part 248 (Fig. 39)'1of the pilot motor, part 63, to advance one-third of a revolution'tThe rotation of this pilot motor field causes the cam cylinder'4part 240 (Fig. 39), to rotate through 20 degrees by means of th~spur gears, parts 225, 221, 222 and 224, and the bevel box gearing,part 226 (Fig. 23), and the bevel gears shown mounted im,idthe cam. cylinder, part 240 (Fig. 39). The movement of thicam cylinder, part 240, operates contact fingers, part 258, (Fig.39), connecting the elevating motor, part 65 (Fig. 22), to thlcircuit for the proper direction of rotation. The projector the~immediately begins to rotate by means of the worm, partthe worm gear, part 67, and the spur gears, parts 68, 69 andthe gear, part 48, engaging with the elevating rack, part 22 (Fig35). The projector, through the bevel gears, parts 70, 219 an220, the latter engaging with .the gears inside the cam cylinder:rotates the cam cylinder, part. 240, in a direction oppositedirection of rotation caused by the pilot motor; the movement OJthe cam cylinder being the resultant of the movements induceby the rotation of the pilot motor field ~nd the rotation of thprojector. . .Summary.-These movements have been described separately. As a matter of fact they occur simultaneously. Thinstant the pilot motor field moves, the elevating motor isnected to the circuit and rotates the projector, which in turltends to rotate the cam cylinder back to the off position.'Vhen the controller hand wheel is advanced through severrevolutions and stopped, the pilot motor field revolves, advancinthe earn cylinder, which, in turn, connects the elevating

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to the circuit through the contact fingers, the elevating motoradvancing the projector. In advancing, the projectorthe cam cylinder back to its original off position, opening thecircuit to the elevating motor and causing the projector to st.op.A slow movement of the controller handwheel advances the caIllcylinder an amount sufficient to connect the armature of theelevating motor through a resistance, thereby operating theelevating motor at a slow speed. A fast movement of the con"troller handwheel advances the cam cylinder still further,circuiting this resistance and causing the elevating motor torevolve at full speed. It will thus be seen that a slow movementof the controller handwheel results in a slow movement ofthe beam and a fast movement of the controller hand wheelwill produce a correspondingly fast movement of the projectorbeam.It is possible, by revolving the training handwheel of thecontroller at a very rapid rate, to rotate the pilot motor field, andthus advance the cam cylinder at a rate which cannot be counter~balanced by the full speed of the training motor. The camcylinder will then advance until it reaches a stop, which preventsfurther rotation. By continuing to revolve the handwheel,after the cam cylinder has reached the stop pin, the controllerand the projector beam will be thrown out of orientation; that is,while the azimuth circle in the controller may have been rotatedthrough, say 180 degrees, the beam, under this condition, mayhave moved through an arc a few degrees less in magnitude .

. THE LAMPRating.-The lamp is rated Type H, Form D-3, Class 60 in.The normal current is 175 amperes, and. the voltage at the arc is65 volts; the difference between 'the arc voltage and the linevoltage being taken up by the'rheostat which is in series withthe arc.Type.-The lamp is of the Double Feed Type, the carbonsbeing fed together or apart, according to the conditions of thearc voltage. This lamp differs from previous lamps, in that thestriking magnet is omitted; this being replaced by the feedapart armature of the feeding magnet which is controlled by thepilot magnet.Carb011ing.-In carboning the lamp, lock the feed apartarmature, part 201, (Fig. 25) of the feeding magnet by means

of the lock, part 173, and separate the carbons by means of thehandle attached to the main feed screw or by inserting the hand


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36.feed wrench through the opening in the rear of the lamp casingframe end, part 17 (Fig. 36).Insert the carbons in the clamps, making sure that thelarger or positive carbon points toward the mirror. The carbonclamp screws, part 122 (Fig. 37), should be set up tightly toinsure good contact between the carbon and carbon clamps.The positive carbon may then be lined up by means of the adjust-ing handles, parts 44 and 45 (Fig. 36), extending through theside of the barrel. These handles are marked for the movementsof the carbon in both horizontal and vertical planes. It is not ,necessary to release the lock, part 173, as this is done automatic-ally when the lamp circuit is closed.Operation.-Separate the carbons slightly and close the cir-cuit breaker. As no current is flowing there is no drop in vol tagein the rheostat and full line voltage is thrown. across the terminalsof the pilot magnet, part 159 (Fig. 38). The feed togetherarmature, part 171, and the feed apart armature, part 172, ofthe pilot magnet are attracted, locking the feed apart armature; t'part 201, and unlocking the feed together armature, part 200, ;of the feeding magnet, part 205, (Fig. 25). ,

The feed together armature of the feeding magnet now fbrings the carbons together, and as soon as current begins to ;'flow through the carbons the voltage across the carbons decreases, idue to the drop in voltage in the rheostat.The excitation of the shunt winding of the pilot magnet,the terminals of which are connected across the arc, is reducedto a minimum and the heavy current flowing through the serieswinding of the pilot magnet,' acting in opposition to the shuntwinding, further reduces the magnetic fiux through the pilot Imagnet. Both armatures of the pilot magnet releas.,e, locking /'the feed together armature, part 200, and unlocking the feed .apart armature, part 201, of the feeding magnet. iThe carbons are then fed apart until the voltage across thearc has reached its normal value of 65 volts; when the flux throughthe pilot magnet, part 159, is sufficient to attract its feed apart\ armature, part 172, locking the feed apart armature, part 201, ofthe feeding magnet. It will thus be seen that, under the condi-tions of normal arc voltage, the flux through the pilot magnetis sufficient to attract its feed apart armature against the tensionof its spring, part 16:3,'while it is insufficient to attract the feedtogether armature against the tension of its spring, part 164.Under these conditions, both armatures of the feeding magnet,are locked, and the lamp cea.o;;eso feed. \

I

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37As the carbons burn away and the voltage of the arc increases,the flux through the pilot magnet increases sufficiently to attrac'tits feed together armature, part 171, releasing the feed togetherarmature, part 200, of the feeding magnet and feeding the carbonstogether until, at normal voltage, the flux through the pilot

magnet decreases and the tension of the spring, part 164, forcesthe feed together armature, part 171, of the pilot magnet out-ward, locking the feed together armature, part 200, of the feed-ing magnet.Summary.-It will be noted that, when voltage in excessof the normal voltage of the arc is present across the carbons,the carbor.s are fed together until normal voltage has beenreached. \Vhen the voltage across the arc is less than normal,

both armatures of the pilot magnet are released, locking thefeed together armature and unlocking the feed apart armatureof the feeding magnet and restoring normal voltage at the arc.Adjustment Each lamp is carefully tested and adjustedbefore leaving the factory, and no changes should be made inthe adjustment unless the lamp fails to maintain normal voltageacros the arc when 175 amperes are flowing through the carbons.]n this connect on it should be noted that with a given arc cur-

rent the voltag which the lamp win automatically maintainacross the arc is less upon first starting than it i~ after the tem-perature of the pilot magnet has increased. This is due to thefact that the resistance of the pilot m~gnet upon first startingthe lamp is less than it is after current has passed for some timethrough the magnet and consequently when starting a lowervoltage is required to produce through the pilot magnet a fluxsufficient to attract its armatures.]n adjusting the lamp, lock the feed apart armature, part201, of the feeding magnet 'and adjust the tension on the spring,part 163, until the pilot magnet armature, part 172, is attractedat 65 volts if the lamp is cold and at 67 volts if the lamp is warm.The feed together armature, part 200, should then be lockedand the tension on the: spring, part 164, should be adjusted sothat the pilot magnet armature, part 171, will be attracted when~he arc voltage has reached 64 volts if the lamp is ~old and at

67 volts if the lamp is warm.In adjusting" the springs, parts 163 and 164, the set screw,P~rt 170 (Fig. 38), should be turned in a counter clockwisedIrec;tion, the screw, part 167, turned clockwise to increa.."'ethetenSIon on the spring and counter clockwis~ to decrea..c;ethethe tension on the. spring. ,\Vhen the proper adjustment has

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88been secured, the set screw, part 170, should be turned in a clock-wise direction, clamping the screw, part 167.* * * * *

OCCULTINGIn order that the crater of the positive carbon may be keptheated and eady for immediate use, an extra or occulting resis..tance is contained in the rheostat connected between the termi..nals marked "Arc " and "Switch" and is controlled by a single f.pole single throw switch on the center of the witchboard marked"Open to Occult Light." This switch is normally closed when

the lamp is in operation. This extra or occulting"resistance isdesigned to cut down the current through the carbons, whenin intimate contact, to 75 amperes, although the current willvary according to the contact area and the pressure between thecarbons.Tooccult the searchlight the followingprocedure is necessary:1st. Trip the circuit breaker.2nd. Open the occulting switch.3rd. Closethe circuit breaker.4tho Feed the carbons together by hand.5th. Raise the knob, part 173, to lock the feed apararmature of feedingmagnet.In occulting the light it is a"ways necessary to first trip the1;drcuit b-eaker as, if this is not done, a severe spark and burningi:or the switch clips will becausedby openingoccultingswitchwhen\the circuit breaker is closed. .'

To throw the-searchlight.back to normal conditions.1st. Separate carbons slightly by hand feed.2nd. Throw down knob, part 173, to unlock feedinmagnet.3rd. Closeocculting. witch.In throwing the searchlight back to normal operating con-ditions, always separate the carbons by hand before closing the,'.occulting switch, as the tips may :ometimes fuse together.

* * * * *tRHEOSTAT

The rheostat is composed of three sections of resistance.1st. The pe manent section.2nd. The variable section.3rd. The extra or occulting section.


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447446442

440

4>'9

Fig. Ui. Rh 0 tat

443444-44')

44 /


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~oth the permanent and variable sections are composed o' "iron grids of sufficient capacity, when connected two in paralle},lto carry the full rated current of the projector, or 175 amperei'. I..The permanent section has five taps which are brought out 41to the five terminals marked "Line." Several gcids of a section ,~of the permanent resistance are short circuited by means of ::Ljumper. In case a grid in the active section breaks, it can bereplaced by one of these short circuited grids. .The variable resistance has equally spaced taps connectedto the various clips' with which the movable blade engages.The current may be reduced by moving the handle of the r.heostatto the left or increased by moving the handle to the right.The extra or occulting resistance is composed of iron gridSof sufficient capacity, when connected two in parallel, to carrya current of 75 amperes when the searchlight 's occulted.

SWITCHBOARD

A circuit b~eaker controls the entir.e current for the b~ar except that earned by the double pole smgle throw fused sWltch,~at the upper left hand corner of the switchboard, which is wiredoutside the circuit breaker, or across the line between the sourclof supply and the circuit breaker, and supplies the station lightsl~At the upper right hand comer of the switchboard a doublpole single throw .used switch controls the current passinlthrough the feeding magnets of the lamp, the field and armatur~.currents for the elevating and training motors and current forthe pilot motors, which is delivered through the' contact cYli.nder/ln the controller. .'The occulting switch in the center of the switchboard shortcircuits the extra or occulting resistance contained in the rheostat'this switch being marked "Open to occult light.'" IThe ammeter indicates the amount of current passing throughthe lamp, and the voltmeter, by means of the small switch locatedbeneath it, will indicate the voltage of the supply circuit wherElrt enters the switchboard, or the voltage across the carbons 0the lamp, the positions of this switch for indicating the line anJ

J.arc voltage being marked on name plate above the switchDirectly below the ammeter is a receptacle into which the at each '"ing plug of the portable lamp may be inserted. By openinone side of the circuit to the portable lamp near the lamp andremoving the insulaiton Onboth sides of the opening in the wireL~

these free ends may be used as a testing circuit to discover ground'

'


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or open circuits at the projector or rheostat. After being usedfor this purpose the wires should be carefully twisted togetherand covered thoroughly with several la~rers of tape.

21, +l/adalJ~

-JVmper-PermantPnt

Fig. 27. Switchboard and Rheostat Wiring.

The t


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48

;!~~< I I I + ~. + I I , ++ +~d~I" I ++ + I I I ++ ... I I~'ll~~ .. + .. I I I I I I +.f 'C l .... "'~t::t: I/):t:~t:11\ :t:,:t: 't .. II) II) :t: :I:. II) ..~t:'1t .... :I:. II) .. II) :I:.

~l!:_lI) 11')" :t: :I:. :I:. .. II) I/) ::t 'tr.a .. :t::t::t:..,II) .. ~~:I:. ... 1I')"~ .. ~:t: ~t:C:II)II)II):t:,,':tfi-Z ..,- .... 'Q OI_~d

~ ~ ~~ ~ ~ ~ ~

~ ~ ~~~


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44


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45

Fig. 31 Top View of Connections.


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it

ui.. Q)0/Xl

-l Srn-. 'aC\l+ .cl...I Q)b():3C\lQ)

"=Q1

a;s-II b()

r-, Qr-u 'a....

a;s- '"I f-t.E

rrnQ:3...Q)QQ

t0t)

1 r--i

II I Ioil

i:;;

.t,1

~

-

~

- ~

~

~

~

~


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47


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48TOOLS AND SPARE PARTS

\Vith each projector a box marked "Tool Box A 60 in. S.L."is furnished. A di,trict box i, also furnished. containing thespare parts Cor several projectors. This box i, marked "ToolBox B 60 in. S. L."

The" A " box contains the following articles:

37

Fig.No.3838

3738383736

41354242

39,3939

37-38

5[,3633644284294:W431432433434435 .. "

122-129-130 37105 37425426106174206115. 43

255-256-258229228427315

PartNo.1 Set (2) Pilot Magnet Armature Springs 163-1642 Feeding Magnet Armature Springs; . . . 1961 Set Positive Carbon Clamps and

Screws 122-3-4-5Set Negative Carbon Clamps andScrews '. . . . . ,2 Pa\\'ls 0 0 5 10/32 Hexagonal Brass Nuts .5 12/24 Hexagonal Brass Nuts ..

4 Pawl Springs ' ... 0 0 0 0 0 2 Feeding Magnet Contact Screws .2 Feeding Magnet Contact Springs .6 Glass Beads ....................1 Set (2) Sight Glasses .6 Pilot Motor Contact Fingers, completewith Springs .:l Pilot Motor Armature Coils .1 Pilot Motor Field Coil ..... 0 0 1 Piece (lOin.) Pin \Vire for \Vorm Gear8 Training Motor Brushes .... 0 1 Plug for Lamp Feed and Training Cir-cuit 0 00 1 5 c.p. Instrument Lamp .1 Lamp Receptacle .1 Ruby Glass in Frame .1 Carbon Tongs , ; .. ,1 Spanner \Vrench for Cable Coupling .,1 Carbon Clamp \Vrench " o 1 Chamois Skin '1 Large Dust Brush .................1 Small Dust Brush 0 2 \Vrenches for 10/32 and 12/24 Nuts ....1. Set (42 pieces) Mica Insulation forLamp

~

" "

0


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49Part Fig.No. No.1 Set (two 15 ohm and one 35 ohm) Re-sistance Units for Training Motors. . 76 22

18 250 volt 10 amp. Fuses, Cat. No. 349521 Portable Lamp Guard, Cat. No. 112158with attaching plug. Cat. No. 34153and 25 ft. No. 16Twisted Lamp Cord1 Socket Wrench for Hand Feed.. ... .. 436The "B " box contains the following articles:1 Set complete Pilot and FeedingMagnetsfor Lamp . . . 381 Set Feed Screws, Nuts, Gears and Ratchet for Lamp 371 Training Motor Armature "411 Set (2) Training Motor Field Coils .. . . . . . . . . . . . . . . 412 Sets (4)Motor Brush-Holders, complete with Springsand Insulation 411 Set Lamp Cables and Terminals. . . . . . . . . . . . . . . . . . 361 Set Contact Plungers with Springs and Insulation(6 Main Contacts with 3 Bases and 8 Training Cir-cuit Contacts with 2 Bases 441 Set Interior Fittings for Couplings for ControllerCable. . . . . . . . . . . . . . . . . . . . . . . .. . . .. . ... . .. . . . . 431 Set (2) Contact Cylindersfor Controller. . . . . . . . . . .. 422 Sight Glassesfor Controller . . . . . . . . . . . . . . . . . . . . 42i Set (10)Contacts with Insulations for Controller. . . . 42consisting of8 Plunger Boxes with Plungers and Springs2 Contact Fingers38 PiecesMica InsulationWhen' spare parts are removed from these boxes for use onthe projector, lamp or switchboard, a requisition should be madeimmediately for new parts to replace them.

NOMENCLATURE OF PARTS. In making requisition for parts, always give part number. 'name of part, figure number and Instrucbon Book number ..In making requisition for parts shown in Figs. 22, 23, 24,35, 36, 39, 40, 41, 43, and 44 give complete name plate stampingof projector.In making requisition for parts shown in Figs. 25, 37 and 38give complete name plate stamping of lamp.In making requisition for parts shown in Fig. 42 give com-plete name plate stamping of controller.


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50

Fig.No.353535353536:3535.3636363535353535353536353536353535353635353636 .353535

Name of Part.Part.No.

In making requisition for parts shown in Fig. 26 state thatthe parts are required for 60 in. searchlight rheostat and givename plate stamping of the rheostat.. In making requisition for switchboard parts state that theparts are required for switchboard for 60 in. searchlight andgive name plate stamping of switchboard.

THE PROJECTOR

1 Base........................................2 Turntable , ..3 Base Sheeting .. .. .. .. .. .. .. .. .. : . .. .. .. .. .. ..4 Ann Elevating Side .. , '. . ,4a Bolt for Ann and Turntable , ..I) Ann Training Side .. ' " '. " .. " " " " "6 Trunnion Block Elevating Side .. " " .. " .. " " "6a Bolt for Trunnion Block and Ann .7 Trunnion Block Training Side ,8 Mirror Ring and Sheeting, complete .9 Barrel Sheet Metal , .10 Front Door Ring ,. 11 Box for Training Mechanism ,12 Box for Elevating Mechanism .13 Cover for Elevating Mechanism Box , , .. ,

14 Cover for Training Mechanism Box ' .15, Front Ring ..16 Rear Ring ..17 Lamp Casing Frame End (rear) .18 Lamp Casing Frame End (front) ,19 Door for Lamp Casing Frame End .. , , .20 Training Handwheel ,; .21 Elevating Handwheel " '. " " " " " .. "22 Elevating Rack ' ' .23 Rear Stop for Elevating Rack ..24 Front Stop for Elevating Rack ..25 Strut for Front Door .26 Front Door Strips : : : : : : : : : : : : : : .' : : : : : :27 Top Ventilator ...28 Bearing Block for Front Door Strut , .29 Bearing Pin for Front Door Strut " ,30 Notch Pin for Front Door Strut " ,31 Bolt for Front Door Strut Bearing Block .32 Front Door Handle " " ' " ,


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51Fig.No.Name of Part.

PartNo.:33 Cap Screw for Front Door Handle " :35:),1 Latch for Front Door 35:35 Bolt for Pront Door Latch 35:~6 Bearing Block for Front Door. . . . . . . . . . . . . . . . . .. :is:37 Trunnion Block for Front Door.. :3S

39966484016424

2322/324A424.3

5755

--15

10263736'3'1283332

. 3534/918/4II24Z

/2

4075453

Fig. 35. Projector.

:~8 Bearing Pin for Front Door. . . . . . . . . . . . . . . . . . . .. 36:~9 Side Rod. . . . . . . . . . . . . . . . .. :3640 Sid e Rod " 36ill Nut for Side Rod. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. :3(1


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52

Fig.No.Name of Part.

PartNo.

43 Side Sight Glasses " " 3644 Carbon Adjusting Handle, complete, (Horizontal) . . 3645 Carbon Adjusting Handle, complete, (Vertical) .... ' 3646 Tie Rod for Front and Rear Rings " " " .. 3647 Locking Strut for Barrel.. .. .. . .. .. .. .. .. .. 3648 Gear for Elevating Rack .. " " 3649 Door for Lamp Trough " 3650 Clutch for Training Handwheel 3651 Main Lamp Cable (+).. . . .. .. .. .. . .. .. .. .. 3652 lIlain Lamp Cable (-)......................... 3653 Controller Cable Plug, complete, for Projector Base 3554 Cap for Controller Cable Plug Projector Base .. '" 3555 Plug for Lamp Feed and Training Circuit. . . . . . . . . 3556 Receptacle for Lamp Feed and Training Circuit. . . . 3557 Cap for Lamp Feed and Training Circuit Receptacle 3558 Thumb Screw for Training and Elevating Mechanism

Boxes " 3659 Bracket for Elevating Rack " .. . . .. .. 3660 Barrel Cable.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3661 BalTel Cable .... , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3662 StUffing Tube for BalTel Cables .. " " " " " " " .. 36

ELEVATING MECHANISM

6:1 Pilot Motor, complete.. .. .. .. .. .. .. .. . . . . .. . . . . 2264 Friction Clutch for Elevating Mechanism .... " '" 2265 Elevating lIlotor, complete.. .. .. .. .. .. .. . . . . 2266 Training Motor , '.. 2267 Wonn Gear for Elevating Mechanism .. '" '" .. " 2268 Spur Gear for Elevating Mechanism. . . . . . . . . . . . . . 2269 Spur Gear for Elevating Mechanism '" . . . . . . . . . . 2270 Bevel Gear for Elevating Mechanism .. . . . . . . . . . 2271 Spring for Elevating MeChanism Clutch. . . . . . . . .. 2272 Nut for Elevatirlg Shaft.. .. .. .. .. .. .. .. .. .. 227:1 Bearing for Gear Shaft " " " .. " .. 2274 Bearing Cap for Elevating Shaft .. " '" " " " .. " 2275 Bearing Cap for Elevating Shaft.. . .. .. .. 2276 Resistance Tube for Elevating Motor . " 2277 HOllowShaft for Elevating Mechanism .. '" '. .. .. 2278 Collar for Elevating Mechanism Shaft :. 2279 Solid Shaft for Elevating Mechanism .. : . . . . . . . . . . 22

~


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PartNo.808]82RB

LAMPName of Part.

Upper Lamp Frame .Lower Lamp Frame .Lamp Cover and Dust Guard .Bw:;hing for Carbon Clamp Lead. . .

Fig.No.3737:37~i7

-/6d.9 -/2/5

3936 4/3"8 74.5 4428 40;'3 4.130.2"'626/0 /746

b/49 22,j23/4 /..150t >

424 6020 /2

41.j"! .J 8.5/ / /48 .5')

Fig. 36. Projector.

848586H7

Nut for Carbon Clamp Lead Bushing ere\\"Screw for Carbon Clamp Lead BushingPositive Feed Screw .Nut for Positive Feed Scre\\'.

:37:37~37:n

-


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;).1

Fig.No.:37

:n:n

..

Name of Part.J

(

Parto

IO()I0 IIO~10: :!UI10.-)I Of i]()"j'10,10!)I I (lIIIII~I\::III11.-)I1fi117II11!lI~()I~ I]~~

Collar for I10sit in' 1"p('


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PartNo.127128129180131] 32] 33

55Name of Part.

Plate for Positive Carbon Support .Plate for Carbon Supports .Negative Carbon Clamp (upper half) .Negative Carbon Clamp (lower half) . .Negative Carbon Clamp Lead .Negative Carbon Support ., .Negative Carhon Support .. . . .. . .

Fig.No.:17:17:37:37:17:n

Fig. 37. Parts of Lamp.

1:34 Screw for Negative Carbon, upport and Carriage.. :n1:35 Negative Carbon Carriage .. . . . . . . . . . . .. :n1:1() Frame for Positive Carbon lamp... :171:37 Bearing for Positive Carbon Clamp. . . . . . . . . . .. :17J:18 Spiral for Positive Carbon Clamp. . . . . . . . . . . . . . .. :n1:39 Knuekle Joint, complete for Carbon Clamp Spiral.. :n140 Insulation for Carbon Clamp, piral :37


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50

.....o


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PartNo.

57Name of Part. rig.No.

141 Sleeve for Carbon Clamp Spiral.. . . .. .. . . . . .. .. .. 37142 Worm for Positive Carbon Clamp.. .. .. .. .. .. .. .. 37143 Shaft for Carbon Clamp Worm. . . . . . . . . . . . . . . . . . 37144 Knuckle Joint complete for Carbon Clamp 'Vorm.. 37145 Insulation for Carbon Clamp Worm.. .. .. .. .. .. .. 37146 Sleeve for Carbon Clamp Worm ....... '. .. .. .. 37. 147 Plate for Negative Carbon Clamp. . . . .. . . . . . . . . . . 37148 Retaining Screw for Feed Screw Brake.. . . . .. . . .. 37149 Lamp Frame Leg .......................... :. 37150 Locking Screw, complete. . . . . . . . . . . . . . . . . . . . . . . 37151 Stop Sleeve for Positive Feed Screw. . . . . . . . . . . . .. 37152 Stop Sleeve for Positive Feed screw ' 37153 Mica Insulation for Positive Connection Strap 38154 Mica Insulation for Positive Connection Strap. , . .. 38155 Positive Connection Strap. : . . . . . . . . . . . . . . . . . . .. 38156 Positive Connection Stud .. : .. ; . . . . . . . . . . . . . . . .. 38157 Negative Connection Stud and Blade.. . . . . . . . . . . 3S158 Screw for Positive and Negative Connection Studs. 38159 Pilot Magnet complete with Flanges and Pole Faces 38160 Glass Beads for Magnet Leads. . . . . . . . . . . . . . . . . .. 38161 Terminal for Magnet Leads 38162 Base Plate for Pilot Magnet. . . . .. . . . . . . . . . . . . .. 38163 Pilot Magnet Armature Spring (Feed Apart Side) .. 38164 Pilot Magnet Armature Spring (Feed TogetherSide) 38165 Foot for Pilot Magnet Armature Spring (Feed ApartSide) 38166 Foot for Pilot Magnet A mature Spring (Feed

Together Side) . . . . . . . . . . . . . . . . . . . . . . . . 38167 Adjusting Screw for Pilot Magnet Armature Spring 38168 Plate for Pilot Magnet Spring Foot. . . . . . . . . . . . .. 38169 Screw for Plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 38170 Clamping Screw for Pilot Magnet Armature Spring 38171 Pilot Magnet Armature (Feed Together Side) : . . . .. 38172 Pilot Magnet Armature (Feed Apart Side) . . . . . . . . 38173 Lock complete for Feeding Magnet Armature. . . . . . 38174 Feeding Magnet Contact Screw. . . . . . . . . . . . . . . . . . 38175 Nut for Feeding Magnet Contact Screw '. 38176 Bracket complete for Feeding :Magnet Contact Screw 38177 Insulation for Contact Screw Bracket. . . . . . . . . . . . 38178 Screws for Positive Connection Strap and Stud .... 38179 Positive Connection Stud and Blade. . . . . . . . . . . . . . 38


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58Fig.No.

Name of Part.PartNo.180 Connection Blade for Feeding Magnet Circuit. . . . . . 38181, Screw for Terminal Block and Frame. . . . . . . . . . . . 38182 Terminal Block ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38183 Connection Strap for Pilot Magnet. . . . . . . . . . . . . . . 38184 Insulation Block for Feeding Magnet Connection

Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38185 Connection Strap for Feeding Magnet. . . . . . . . . . . . 38186 Turn Buckle for Pilot :Magnet Link. . . . . . . . . . . . .. 38187 Link for Pilot Magnet Armature. . . .. . . . . . . . . . . . . 38188 Series Coil for Pilot Magnet. . . . . . . . . . . . . . . . . . . . . 38189 Shunt Coil for Pilot Magnet. . . . . . . . . . . . . . . . . . . .. 38190 Insulation Flange for Pilot Magnet. . . . . . . . . . . . . . 38191 Strap for Pilot Magnet Armature Spring. . . . . . . . .. 38192 Latch for Feeding Magnet (Feed Apart Side) : . . . .. 38193 Latch for Feeding Magnet (Feed Together Side) . .. 38194 Link for Feeding Magnet. . . . . . . . . . . . . . . . . . . . . . . 38195 Nut for Feeding Magnet Latch Link. . . . . . . . . . . . . . 38196 Feeding Magnet Armature Spring. . . . . . . . . . . . . . . . 38197 Adjusting Stud for Feeding Magnet Armature

Spring .. 38198 Arm for Feeding Magnet Armature " " 38199 Arm for Feeding Magnet Armature. . . . . . . . . . . . .. 38200 Feeding Magnet Armature (Feed Together Side) .. 38201 Feeding Magnet Armature (Feed Apart Side) .... " 38202 Pivot Pin for Feeding Magnet Armature. . . . . . . . .. 38203 Latch Block for Feeding Magnet Armature (FeedTogether side) 38201 Latch Block for Feeding Magnet Armature (FeedApart Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 25205 Feeding Magnet Coil. . . . . . . . . . . . . . . . . . . . . . . .. 38206 Feeding Magnet Contact Spring. . . . . . . . . . . . . . . . . 38207 Stop for Feeding Magnet Armature. . . . . . . . . . . . .. 38208 Screw for Feeding l.Iagnet and Lamp Frame . . . . . .. 38209 Connection for Feeding l.Iagnet. . . . . . . . . . . . . . . . . . 38210 Screw for Pilot Magnet and Lamp Frame. . . . . . . . . 38211 Terminal Block for Lamp (Same as 182, Fig. 38) .. 25212 Main Lamp Blade (Same as 157 and 179, Fig. 38) . . 25213 Feeding Magnet Connection Blade (Same as 180,Fig. 38) " . . . . . . . . . . .. . . 25

PILOT MOTOR '\",214 Supporting Frame for Contact Fingers,. . . . .. . . .. 39


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PartNo.

59Name of Part. Fig.No.

215 Bearing Bracket for Pilot Motor. . . . . . . . . . . . . . . . . 39216 Screws and Insulations for Contact Plate. . . . . . . . . 39217 Screw for Supporting Frame. . . . . . . . . . . . . . . . . . . . 39218 Screw for Supporting Frame. . . . . . . . . . . . . . . . . . . . 39219 Bevel Gear for Pilot Motor (Large) 39220 Bevel Gear for Pilot Motor (Small 39221 Spur Gear for Pilot Motor , 39222 Spur Gear for Pilot Motor. . . . . . . . . . . . . . . . . . . . . . 39223 ,'Bearing Screw for Pilot Motor Spur Gears 39224 Spur Gear for Pilot Motor. . . . . . . . . . . . . . . . . . . 39225 Spur Gear for Pilot Motor. . . . . . . . . . . . . . . . . . . . . . 39226' Bevel Gear for Pilot Motor. . . . . . . . . . . . . . . . . . . . . . 39227 Bushing for Pilot Motor Shaft. . . . . . . . . . . . . . . . . . .39228 Pilot Motor Field Spool 39229 Pilot Motor Armature Spool. . . . . . . . . . . . . . . . . . .. 39230 Connection Lead (Long) ','. . . . .. 39 .231 Connection Lead (Short) ,............ 39232 ' End Plate for Pilot Motor. . . . . . . . . . . . . . . . . . . . .. 39233 End Plate for Pilot Motor. . . . . . . . . . . . . . . . . . . . .. 39234 Screw for Supporting Frame and Top Plate , 39235 Screw for Connection Board and End Plates ., . . .. 39236 Guide Block for Contact Fingers , .. , 39237 Guide Block for Contact Fingers . 39238 Insulation for Pilot Motor. . . . . . . . . . . . . . . . . . . . .. 3923'9 Insulation for Pilot Motor , . . . . 39240 Pilot Motor Cam Cylinder Complete , 39241 'Connection Board .. , , ., 39242 Terminal Block for Connection Board. . . . . . . . . . .. 39243 Nuts for Terminal Block , , .. , , 39244 Connection Straps , .. , , . . 39245 Contact Plate , .. , . . . . . . . . . . . . . . . . . . . . . . . . .. 39246 Contact Plate , . , ,. 39247 Insulation Block for Contact Fingers .. , . " . . . . . . . 39248 Field for Pilot Motor .. , , , , , . . . . . . . . . 39249 Pole Piece for Armature Spools: .. , , ., .. .. 39250 Core for Armature Spools. '0 ' , , 39251 Roundhead Screw for End Plate and Armature Core 39252 Flathead Screw for End Plate and Armature Core 39253 Contact Finger Complete , , 39254 Nutfor Contact Finger Studs. , , , . . . . 39255 Spring for Contact Finger, , .. , ,. , , . . 39256 Connection Leaf for Contact Finger , . , , 39

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c

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64/83

Name of Part.artNo.257258259260261

262263264265266267268269~70271272273274275276277278279280281282283284285286287288289290

291292

61Fig.No.

Stud for Contact Finger 39Spring and Tip for Contact Finger 39Frame and Roller for Contact Finger 39Cotter Pin for Contact Finger Stud .. 39Screw for Contact Finger 39

FOCUSING CARRIAGEFocusing Carriage ..... 40Rack for Focusing Carriage . 40Focusing Rod .... 40Focusing Crank . .40Handle for Focusing Crank 40Rail for Focusing Carriage 40Rail for Focusing Carriage (not illustrated) . 0 0 40Cap Screw for FocusiI}g Carriage Rail. 40Stop for Focusing Carriage 40Worm Gear for Focusing Carriage Shaft. . . . . . . . .. 40Screw for Bearing of Focusing Carriage Shaft. . . . .. 40Bearing for Focusing Carriage Shaft 40Focusing Carriage Shaft 40Pinion for Focusing Carriage Shaft o. . . . . . . . . .. 40Worm for Focusing Rod 40Insulation Block for Contact Clips 40Screw for Contact Clip Insulation Block ..... 40Small Contact Clip with Flexible Connection, com-plete 40Large Contact Clip with Flexible Connectioncomplete ... 40Washer for Large Contact Stud. 0 0 40Washer for Small Contact Stud , 40Insulation Block for Connection Studs. 40.Screw for Contact Stud Insulation Block .. o o. 40Contact Stud (Large) 40Nut for Large Contact Stud 40Contact Stud (Small) ..... o. 40

Nut for Small Contact Stud .. 0 0 40Locking Nut for Lamp .. o. . 40Stop Pin for Focusing Carriage 0 0 40TRAINING AND ELEVATING MOTORS

Bearing Head, Commutator End 41Bearing Head, Worm End , 0 41

0

0 0 00

0 0 0 0

0 0

0

0 0 0 0 ~ 0

0 0 ., 0 "0

0 0 0 0 0 0 0

0 0 0 0

0

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0 O' 0

0 0 0 0 0 0

0 00 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0

0 0

0 '0

0 0 0 0 0 0 0 0 0 0

0 0 0 '.

0

0 0

0 0 0 0 0

0 0 0 0 0 0 O'

0 0 0 0 0

... .. .. .. .. .. ....

0 0 0 0 0 0 0 0

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66/83

65Fig.No.4242424242424242424242424242

Narne of Part.Bracket for Lamp .Screw for Top Plate and Frame .Screw for Frame and Support .Screw for Lamp Bracket and Frame .Dial Cover (1 in. Diam. lJr; in. thick Glass) .Retainer for Dial Cover .Rubber Gasket, Dial CoverContact Cylinder, complete ....................Shaft for Training Handwheel '.' .Shaft for Elevating Handwheel .Pointer .Support for Medium and Small Gear '," ,Collar for Elevating and Training Handwheel ShaftsScrew for Large Gear, and Indicating Dial .Pin for Contact Cylinder and Elevating and TrainingHandwheel Shaft 42Taper Pin for Elevating and Training Wheel Collars,and Shafts (No. 0, in. long) . . . . . . . . . . . . . . . . .. 42Nut for Large Gear and Pointer Support. . . . . . . . . . 42Plunger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 42Large Gear with Bushing. . . . . . . . . . . . . . . . . . . . . . . 42Medium Gear , . . . . . . . . . . . . . . . . . . . . . .. 42Small Gear 42Screw for Plunger Receptacle and Contact FingerSupport, long . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Screw for Medium and Small Gear Support.. .. .. .. 42Nut for Plunger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Plunger Receptacle, with Plunger, Spring and Nuts, 42Spring for Plunger. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 42Mica Insulation for Plunger Receptacle, Medium. . . 42Mica Insulation for Plunger Receptacle, Large. . . . . 42Mica Insulation for Plunger Receptacle, Small. . . . . 42Plunger Receptacle with Plunger, Spring and Nut,left hand. . . .. . '.............. 42Plunger Receptacle, with Plunger, Spring and Nuts,right hand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42Contact Finger, with Support and Contact Tip, righthand .0..................................... 42Contact Finger, with Support and Contact Tip, lefthand 42Mica Insulation for Contact Finger Support. . . . . . . 42Indicating Dial. . , . , . .. . . .. .. .. . . . . . . . . . . .. .. .. 42

360359

361262

350351:352353354355356357

344345346347348349

343

358

PartNo'328329330331332333334335336337338339340341342

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Fig.No.4242424242424242424242

67Part Name of Part.No.363 5 c.p. 125 Volt Incandescent Instrument Lamp .364 Receptacle for Lamp ,complete .365 Receptacle, complete, for Controller Base .366 ' Cable Receptacle, Shell only. . .. . .367 Insulation Block for Cable Receptacle .368 Cap for Cable Receptacle .369 Chain for Frame and Cable Receptacle Cap .,370 Female Contact .371 Center Contact .372 Screw for Frame and Cable Receptacle .373 Insulation for Contact Cylinder .

COUPLINGS374 Plug for Controller Cable (Controller End) .. , .... , 43375 Interior Fitting for Controller Cable Plug and Plugin Projector Base , , , . , , . , " 43376 Controller Cable Receptacle Projector End , . 43377 Interior Fitting for Controller Cable Receptacle and, Controller Receptacle " 43378 Gasket for Controller Cable Plug and Receptacle.. 43379 Interior Fitting for Lamp Feed and Training CircuitPlug , , , 43380 Rubber Washer for Lamp Feed and Training CircuitPlug , .. ,.,....................... 43381 Rubber Gasket for Lamp Feed and Training CircuitPlug .... ,................................. 43382 Brass Washer for Cap of Lamp Feed and Training

Circuit Plug , " 43383 Interior Fitting for Lamp Feed and Training CircuitReceptacle , , , , 43384 Rubber Gasket for Lamp Cables" ,', " ., , 43CONTACT PLUNGERS, ETC.

385 Carbon Clamp Adjusting Rod , . . . . . . . . . . .. 44386 Ball and Socket for Carbon Clamp Adjusting Rod. . 44387 Locking Lever .for Carbon Clamp Adjusting Rod. .. 44388 Spring for Locking Lever. . . . . . . . . . . . . . . . . . . . . . . 44389 Handle for Carbon Clamp Adjusting Rod. . . . . . . . . 44390 Connector (Outside) for Main Contact Plungers. . . . 44391 Connector (Inside) for Main Contact Plungers. . . . . 44392 Main Contact Plungers 'with Insulations. . . . . . . . . . 44393 Main Contact Plungers with Insulations.. . . . . . . . . 44

..


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70/83

69Fig.No.44444444

l1ame of Part.Main Contact Plunger , ., , ., .Nuts for Main Contact Plunger .Spring for Main Contact Plunger .Cap for Main Contact Plunger Spring Box ., .Small Contact Plungers with Insulation" for LampFeed and Training Circuit , . . . . . . .. 44Small Contact Plunger .. " . . . . . . . . . . . . . . . . . . . . .. 44Nut for Small Contact Plunger. . . . . . . . . . . . . . . . .. 44Spring for Small Contact Plunger. . . . . . . . . . . . . . .. 44Cap for Small Contact Plunger Spring Box 44Spring Box for Main Contact Plunger ., , . .. 44Spring Box Gong) for Main Contact Plunger ., , 44Spring Box for Small Contact Plunger " 44Terminal for Plunger and Connectors 44Locking Bolt for use during transportation o' 35

MISCELLANEOUS

PartNo.394395396397398399400401402403404405406407

408 Nut for Center Bolt .. " , . . . . . . 24409 Nut for Center Bolt .. 24410 Center Bolt " 24411 Small Contact Rings '. . . . . . . . . . . . . . . . . . .. 24412 Large Contact Ring (outside) , . . . . . . .. 24413 Large Contact Ring (inside) 24414 Insulation for Contact Rings 24415 Tread Roller 24416 Spoke for Tread Roller Spider. . . . . . . . . . . . . . . . . . . 24417 Collar for Tread Roller 24418 Bevel Gear for Training Mechanism , . . . . . . .. 24419 Bevel Gear for Training Mechanism , 24420 Nut for Gear Stud. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 24421 Gear. Stud 24422 Spur Gear for Gear Ring , 24423. Gear Ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24424 Washer for Handwheels 24

SPARE PARTS AND TOOLS NOT ILLUSTRATED425 l~ Horizontal Brass Nut426 ll- Horizontal Brass Nut427 .Pin Wire for Worm Gear428 Ruby Glass and Frame429 Carbon Tongs430 Spanner Wrench for Cable Coupling

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71/83

70Fi~.No.

PartNo.431432433434435436

Name of Part.Carbon Clamp WrenchChamois SkinLarge Dust BrushSmall Dust BrushWrench forl~ and -U NutsSocket Wrench for Hand Feed

RHEOSTAT437 Large Grid. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26438 Small Grid . 26439 Mica \Vasher for Grids. . . . . . . . . . . . . . . . . . . . . . . .. 26440 Tenninal 26441 Nut for Connection Stud , 26442 Contact Blade , 26443 Handle for Switch Arm .. .. .. 26444 \Vasher for Switch Arm Handle.. .. .. .. 26445 Switch Arm .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 26446 Slate Base , 26447 Cap Screw for Slate Base. . . . . . . . . . . . . . . . . . . . . .. 26


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PART III.

CARE AND PRESERVA TION.TRANSPORTATION AND NOTES


73/83

72CARE AND PRESERVATION

An inspection of all parts of the light should be made onceeach month "and the lamp mechanism 'cleaned carefully aftereach period of operation, being careful to -remove all carbon dust.All parts of the light should be kept free and clean from dirt. atall times. The moving parts should be oiled occasionally wItha small amount of good oil; if the oil hardens or gums on any ofthe parts it should be removed with a cloth moistened withkerosene oil and fresh lubricating oil applied. . .

The feed-screws of the lamp, magnet, armature bearIngs,and latches, should be oiled with a very small amount of goodclock oil. Special attention should be given to the following partsof the Model 1910 searchlight; they require occasional oiling.The same is true for the similar parts of the other types of light.

A. Parts 415, 418, 419, 422 and 423, Fig. 24. To reachthese parts it will be necessary to remove the base sheeting.B. Bearing-pin for front door, part 38, Fig. 36.C. All gearing in training mechanism boxes and the shaft,part 79, Fig. 22.D. The field of the pilot motor; it may be oiled throughoil-holes in the pilot-motor end-plates.E. Parts 263, 271, 273, 275, 276, Fig. 40.F. The latches, parts 192 and 19:3.All electric contact points should be kept brigh~.The electric motors need the attention usual for such appa-ratus, special attention being given to brushes, commutator andoil for. the bearings. The oil should be renewed occasionally,

whether or not any signs of heating appear; if there is any heat-ing, the plugs at the bottom of the bearings should be removed,the oil drawn off and replaced by new. In smoothing the com-mutator and fitting the brushes to it, sandpaper should be used.EMERY CLOTH MUST NEVER BE USED ON THE COM-MUTATOR OR BRUSH. .The searchlight should never be operated with the arc insidethe fOjeus,that is, between the mirror and the focal point, as the

excessive heat from the arc might cause the silvering to peelor the mirror to crack. (A divergent beam indicates that thearc is inside the focus; a crossed beam that the arc is outsidethe focus.)Moisture should not be allOWed to accumulate on the sur-face of the mirror or run down between the mirror and its ring,


74/83

73as its presence in the barrel is detrimental to the silvering. Thebeam should not be elevated above 30, as hot carbon particlesmight drop on the mirror and crack it. .Clean the mirror as follows: Rea:ove all dust with a dust-brush and then polish with a chamois skin. If the mirror. hecomes dirty or greasy, clean with the following preparation:!parts precipitated chalk (by volume), .! parts water, 2 table-spoonfuls alcohol to a quart of the preparation. The prepa-ration should be applied carefully with a sponge and in Yery.small quantities, polishing when dry with a piece of clean cheese-cloth. Never use anything which will scratch the face of ~hemirror. '

In removing the lamp Model 1910 from the barrel lock thebarrel with the st~ut (part 47, Fig. 36, Part II.) which engageswith the pin on the locking rack. \Vhen the carbons are red-hot, first remove the hot carbons with the door open 45. Ifthe door is swung open 90 the hot carbons may crack the middleglass strip. .When operating the lamp-feed by hand, insert a woodengauge between the feed-together-arrnature of the feeding-magnetand the leg of the lamp, for the purpose of keeping the feed-together-pawl out of the engagement with the ratchet.When the light is not in operation, keep it cmiered with acanvas cover.

TRANSPORTATIONThe barrel, with the mirror and glass door in place, is shippedin one crate, the barrel being suspended on heavy cross timbers.

The base,:'With the arms in place, is shipped in another crate'(Figs. 33 and 34, Part II.) ,The' crating throughout must be of the most substantialconstruction, to insure the safety of the light. The skids shouldbe not less than 8" x 3", the uprights supporting the barrel notless than 4" x 6", and the cross timbers not less than 4" x 6J1'.The base must be closed in underneath by planking to protectthe open connection plugs; the handles on the side must be pro-tected by the crate, as shown in Fig. 34. For shipping the Model1910 light, a locking bolt (part 417), to be inserted in place ofthe bolt 4A, Fig. 35, is supplied. The locking bolt pa..


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74CAUTION!!! LOCKING BOLT. THIS BOLT PREVENTSMOVEMENT OF TURNTABLE DURING TRANSPORTA-TION AND SHOULD BE REMOVED AND STANDARDBOLT SHOULD BE INSERTED WHEN THE LIGHT IS

INSTALLED.If the particular light to be shipped has no locking-boltas described above for Model 1910, provision similar to thatdescribed above for the Model 1910 light should be made.NOTES

The beam is focused best by instructions from an observer .well off to one side. .In order to get satisfactory results, the controller operatormust be in the vicinity of those for whom the target is to beilluminated.Experience is the only guide as to how the beam shall bedirected for best illumination.It is absolutely impossible for an observer on the water toestimate his distance from an o~erating searchlight.The ranges at which targets may be illuminated by a 60-inch light for satisfactory observation are as follows:-_.---.- ---------; . Heavy.Very clear Average Slight haze Mediumhaze hazeatmosphere. atmosphere. (or rain). (graydawn). or

--------__ fog.10,000 yards(Further underexceptionalconditions)

6,000to8,000yards

3,000to4,000yards

1,000 0to2,000yards

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APPENDIX

PORTABLE SEARCHLIGHT SET

Illustrations from A rtillery Note No. 3 I


77/83

76PORTABLE SEARCHLI GHT SET

The necessity for some form of portable searchlight has beenlon~ felt and one or two types have been designed. Figs. 45, 46and 47 show a portable set of recent make of which quite anumber have been purchased. These were constructed forcoast artillery purposes and are suitable to be taken on fair roadsat ordinary speeds.

As may be seen from the photographs the power plant ,andsearchlight are mounted on. separate trucks, each to be drawnby a pair of horses. The power plant and its truck completeweigh 6,580 pounds, and the searchlight and its truck completeweigh 5,800 pounds. .The large figure for the latter is due con-siderably to the weight of the cable, the power cable being 500feet of four conductor cable (one pair being 90,000 c.m.) and thecontroller cable 1000 feet of eight conductor cable. Bothtrucks are equipped with brakes.

SEARCHLI GHT TRUCKThis truck carries the searchlight, a cable reel, and a mec~a-nism by which the light may be elevated, keeping it in Its

vertical position.The mechanism referred to is as follows: A pair of armsare fastened to the truck through pivots and in a similar mannerconnected to the projector's base, see Fig. 45. These arms areheavily constructed and carry most of the weight. A pair ofarms of light construction are similarly connected below and toone side on the truck and to an extension from the projector's base,making a four bar* linkage of -the form of a parallellogram.The bar between the pivots on the truck being fixed, it is evidentthat whatever position the mechanism takes, the bar betw~enthe pivots on the projector's base and base extensions remamsparallel to it. Hence the searchlight will keep upright. Motionfor moving the light up and down is obtained through a bellcrank fastened to a cross-arm at about the middle of the twoupper bars, the other arm containing a nut into which a scr~Wengages. By turning the screw the light may be raised or lowe:edas desired. The screw is turned by a crank, the handle bemgremovable. \Vhen the projector is put in its elevated position,it may be further supported by means of an auxiliary bar,shown loose in the photograph. This support may be necessaryin high winds to give stability.

*As appJi~d to a mechanism, a bar means a rigid connection betweentwo points. .


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(j


79/83

78The projector its~lf is the 8-wire type already described.It is equipped with a voltmeter and ammeter, mounted in thethe same case, attached to one of the drum supports. A plat-form for the attendant extends from the base. This platformfolds up when the projector is brought down on the truck. Thecables are carried on independent reels mounted side by sideon the same shaft.Plug .and socket joints are used for the cable connections. Inconnecting up the projector the two cables are drawn from thereel and the plugs inserted in the sockets of the generator and.exciter respectively. The other ends of the cables are broughtthrough the reel shaft to sockets at its ends, in which the plugs ofthe lamp cable and training mechanism cable respectively maybe inserted.

POWER PLANT TRUCKThis truck carries a 3-cylinder gas engine direct connectedto the generator and exciter.The engine is cooled by water circula~ion with a gear pump.A small water tank is used and the water after coming from the

cooling chambers of the engine is taken to a radiator where afan is brought to play on it. The fan is of the radial type andbelt connected to the engine shaft.A jump spark ignition is used for the engine, the currentbeing furnished the primary from a battery of a few storagecells. The battery is connected to a small generator (Apple type)through an automatic switch so that it is automatically discon-nected when the battery is charged and begins charging whenever

the battery becomes slightly discharged. The battery sparkcoils and switch are all together in a box. On account of troublewith this system, it is to be modified when conditions require it,by substituting for the "Apple" generator a permanent fieldmagneto to operate directly on the spark coil, and for the storagebattery, a set of four ignition dry cells which will be used whenstarting the engine. A double throw switch will serve to throwthe coil from the dry cells to the magneto when the engine has .come up to speed. The magneto will give 7 volts when thecoil. is using the proper amount of current, which. is about ,80amperes.

The generator is a 9.6 k.w. and runs at 600 r.p.m. It gives130 amperes at 74 volts. This generator has a series field anda field differential to it, the latter being separately excited. Theexciting current is furnished from a t k.w. generator mount~d


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79


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82/83

81on the engine shaft, its v9ltage being 110 volts. In additionto furnishing the exciting current, this generator furnishespower for the electric control and for four 16 c.p. lamps on theengine truck. " .. Since the main generator is enclosed and also located closeto the engine, it is necessary to use a. fan to supply a good cir-clliation of air to keep the temperature down. The' fan is ofthe "radial typ~ and. belt connected to the engine shaft .

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83/83

Present Status of the Series of Artillery. NotesNo. Title .

t 1 Instructions for Regulating Powder Charges of Coast Artillery inTarget Practice .t 2 Armor Attack Sheet.t 3 Directions for Setting Up, Adjusting and Using, the Lewis Type..A to Depression Position Finder .t 4 Proceedings of a Board of Officers, Convened at Governor's Island,New York, for the Purpose of Preparing and Formulating a Syst~mof Electrical Communication for Artillery Fire Control..t 5 Construction of a Difference Chart t 6 Description and Diagram of the Telautograph .t 7 Curves and Tables of Robinson's Anemometer t 8 The Lewis Depression Position Finder. Function and Method ofOperation of the Elevating Screw. Device for Illuminating theCross-\Vires. Supplement to Artillery Note No.3.Searchlights. b 10 Mortar Zones and Mortar Range Tables.11 Seacoast Engineering.12 Notes on Oil Engines.fc 13 System of Nomenclature of Parts o( Modern BaUerIes.t 14 Form for" Report of an Inspection Relative to Coast Artillery In-struction, the Condition of the Batteries, and the Fire Control andDirection System. to.t 15 Test of Experimental Fire Control Installation at Pensacola, Florida . td 16 Notes on Explosives.17 Notes on the Telephone .t 18 Theory of the Storage Battery.

19 Digest of Orders and Circulars Issued by the War Department Per-taining to the Care and Use of Seacoast Armament (rom January I,1896, to January I, 1904. t 20 Correspondence Relative to Preparation of Data for Elevation Scalesof Seacoast Guns.21 Topical Index of Artillery Subjects .t 22 Practical Method of Adjusting a l\fodern Gunt 23 Discussion Bearing on the Tactical Use of Mortars.24 Topical Index of Artillery Subjects. Supplement to Artillery NoteNo. 21.b 25 Note on Ballistic Tables : 26 Construction of a Difference Chart.

27 Topical Index of Artillery Subjects. Second Supplement to Artiller)'Note No. 21.

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military searchlights (1912)

Documents