Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION
Transcript of Tm 5-7045 SEARCHLIGHT, 60-INCH MODEL 1942 AND CONTROL STATION
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S
el1942
s:
uctionsManual
Lists
anual
Publ
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ructionManual,
ODEL1942,and
hedbytheGENERAL
ishedforthe information
ned.
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ROLSTATION
EARCHLIGHT
6879INCLUSIVE
S.ARMY
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sbeenpreparedtoaid intheopera-
neralElectric60-inchAntiaircraft
constructionandcoverstheopera-
controlstation only.Maintenance
recoveredbyaseparateMaintenance
perationandmaintenanceofthe
ecoveredrespectivelybyaPowerPlant
7049)andaPowerPlantMainte-
).
havebeen numberedconsecutively
re suitablytitled.Alistof these
numberonwhichtheyappear,will be
ghtto theantiaircraftproblem,as
plesunderlyingthedesignofthe
cussedinanaddendumtothis Manual.
thereferencenumbersofpartsand
hereferencenumbersofthesameparts
chlightandControlStationParts and
epurposeofthis istofacilitatethe
njunctionwitheachother.
ecommendedthatitbestudiedin
ge1.Skippingaround,especiallyinthe
edandtechnicaldescription,willlead
eitmore difficulttounderstandthe
t.
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3
..................................IX
.......XI
nsions............................XI
.................................149
STRUCTIONS
..............1
..............................3
4
....6
............7
.............10
...............................12
........13
mechanismAssembly..............16
oller.............................17
Frame...........................17
...........18
er-baseAssembly...............18
embly.............................20
..........20
ESANDMISCELLANEOUS
Cables..........................22
ent..............................22
ox..............................22
wageBox..........................23
............................23
s..................................23
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nt'd)
towing24
PMENTSETUP
on26
tup27
29
ntPoint.30
ctionofUnits32
ndCarboning33
ons35
l35
odsofD.E.C39
rol39
ol40
ontrol42
3
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nt'd)
NDTECHNICAL
ge
stem46
fLampOperation48
on48
8
49
tion49
rent54
ruments56
6
s58
58
ce58
eaderSystem58
m59
m60
rolTransformers60
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nt'd)
s62
apterRelay62
PilotLight63
use63
Switch63
TROLSYSTEM
D.E.C63
atibn64
chlightandControlStation65
odsofD.E.C65
matSearchlight66
matControlStation72
m73
rator74
oftheAmplidyne....74
ftheAmplidyne75
eGenerator76
ghtOperation76
77
ubsystem77
78
er78
s81
81
cuit82
cuit83
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nt'd)
Low-speedSystemsCombined...84
thLow-speedSystemAlone..84
5
ManualD.E.C86
86
6
86
tor87
88
ctor88
tSwitch88
witches89
s89
BRICATION,
ON
91
7
sformers108
ControlTransformer109
ControlTransformer114
mits117
118
t119
sion120
22
23
thClutch.123
th-flywheelClutch124
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nt'd)
n125
eZero-indicationSystem128
icationSystem128
peration128
edIndicators129
cator129
dicator130
eedIndicators130
icator131
dicator131
E.C.Operation131
ystem132
LEM
39
ectorDiameter140
the Source142
ciency143
143
osphere144
cteristicsoftheTarget145
er147
fGlasses148
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EquipmentXII
gPosition1
tationPosition2
2
4
anismBox16
bly17
3
earchlightEquipment27
t36
tion37
GeneralArcSystem45
LampGearing51,52
7
Zero-readerSystem59
TransmitterandControlTransformerat
TransmitterandControlTransformerin
on61
AzimuthD.E.C.System64
SearchlightGearing67,68
Control-stationGearing69,70
Power-driveSubsystem74
eratorTheory75
Electrical-actuationSubsystem78
ElectronicAmplifier79
nbetween1-speedand33-speedSystems84
ProtectiveSubsystem87
mp-mechanismBox92
mpandMirror94
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ont'd)
earchlightAssembly94
hassis96
ase96
rntable96
zimuthCorrector98
nctionBox98
zimuthControlBox98
evationControlBox100
evationControlBox100
evationControlBox100
ontrolStation102
ontroller102
evationInstrumentHousing106
ontrollerInstruments107
urntableLevels108
evationControlBox110
evationHigh-speedControlTransformer.111
PointsinjunctionBox112
o-indexPointer113
ontrolTransformerAdjustingWorm..113
vationHigh-speedControlTransformer114
ontrolTransformer.115
vationLow-speedControlTransformer.116
vationLow-speedControlTransformer.117
amp-mechanismBox118
earchlightLamp119
esinPosition 120
hermostatMirror121
round-glassFinder122
ontroller123
rSearchlightandControlStation135
ramforSearchlightandControlStation137
Arc140
Arc140
genceT141
eIntensityofBeam142
fAngleofAspect146
sibilityof theTarget147
sitionwithRespecttoArcon Visibility
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ileddescriptionofthe operation
chlightequipment,itisimportant
with therelationshipofthisequipment
aftbattery.
chabattery istodefendaposition
heantiaircraftgunsarethe nucleusof
roperlydirectthegunfireona swiftly
roldirectorisemployed.Inthepresent
viewthe targetinorderto obtainthe
tationoffuturetargetposition.At
ansofilluminatingthetargetmustbe
tionofthe searchlightequipment.
pointinspacetowhichthe search-
d,thepositionofthetarget isdeter-
gulardisplacementofthesearchlight
fromthelocator.However,fortactical
rable,especiallyafterthetarget
olthesearchlightbeamfromacontrol
entrequirements,thelocatorandcon-
at pointsdistantfromthesearchlight,
ollingthesearchlightfromthesere-
Thisisthe functionofthedistant-
stem.Thenecessarypowerforproper
unitsis suppliedbythepowerplant
or.Adescriptionofeachunit ofthe
lbefoundinSectionI. Ageneralar-
entisshownin Fig.1.Actualemplace-
edindetailin SectionI.
NDDIMENSIONS
Binoculars
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ghtequipment
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TRUCTIONS
ations,associatedreferencesandtext,provides
esearchlightequipmentsufficientonlyforoper-
rchlightequipmentconsistsofalltheitemsshown
however,willnotbediscussedinthis book,
sand MaintenanceManualprovidedseparately
riousparts willbemadeinmore detailinsub-
visionsofthesearchlightareshownin Fig.2,
hlightarrangedbothforoperationandfor trans-
onsaredesignatedbyletterreferences,inorder
edandreferredtothroughoutthis instruction
fied.
atingposition
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HTANDCONTROLSTATION
portationposition
smBox
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UIPMENT
howninFig.3. Theillustrationinitselfpre-
ofmanyof thedetails,andsuchitemsrequireno
ection.Foroperation,andfor otherdetailswhich
escriptivecommentshavebeenprovidedwith
usin-
e
ergize
their
rting-
mbly
and
trans-
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OX
s
h
able
able
eed)
ble
y)
gative
he
orfor
erre-
ator
nput
cir-
output
matic
on
cebe-
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HTANDCONTROLSTATION
sociatedreferencesdescribe,themajorcom-
bly.
Trans-
volt-
e
sition
es)
th
ator
hen
nous
on
mer
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ONTROLBOX
thitsmechanicalandelectricalelementsare
x
dicator
muth
rom
ers
or
-gen-
cuit
uth
ve
33-
em
r
th3 3-
or
hen
nous
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HTANDCONTROLSTATION
x(Cont'd)
h
ampli-
dazi-
dicator
33-
em
tor\
h
embly
caland
constitutingtheturntableassembly.
ook
bly
nter
min
hlight
n
while
ntable
n
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E
e
mbly
or
run-
sing
or-
tor
ontrol
gs
and
e
onof
th1-
r
bleand
d
ble
erto
dcon-
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TANDCONTROLSTATION
ndits principalmechanicalandelectrical
Fig.8.
x
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CONTROLBOX
ch
Arms
Sock-
ol
ts
Selec-
ws
cir-
mp
ment
ampli-
caland
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HTANDCONTROLSTATION
mplifierandfuseboardareillustratedin
r
er
evation
on-
tion
tor
speed
3-
r
ampli-
nts
al
nal
ower
r-
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TROLSTATION
rfocal
on
r
hlight
ment
ntoa
on
re-
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STATION
mer
rm-
eader
sta-
yn-
ver's
o
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RMOUNT
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HTANDCONTROLSTATION
ESANDMISCELLANEOUSEQUIP-
embliesforusewiththis searchlightequipment
torcableorafifteen-conductorcable,furnished
t,isrequiredforconnectionbetweenthelocator
fteen-conductorcableiskeyeddifferentlyfrom
leusedbetweenthesearchlightandthecontrol
eofthesecablesis impossible.Theplugsareso
onin,or withdrawalfrom,theirpropersockets
he plugbodies.Anattempttowithdrawaplug by
sult inbrokenconductors.Allplugsmustbe
ymeansoftheirassociatedwingnuts. Maleplugs
with protectivecapswhichmustbefirmlyattached
tsassoonasthe cableisdisconnected.Thiswill
heskirtbeing forcedoutofround.Atough,flexible
both powerandcontrolcables;care,however,
ventdamagetothe sheathandtoavoidsharpbends
ent
veboxes,cablereelsandreplacementcarbons
hlightequipment.Ageneraldescriptionofeach
providedbythe directlyfollowingparagraphs.
ationsparepartsandtools,togetherwiththe
nsportingcase,formaseparatesingleitem ofthe
.1.Parts andtoolsarelistedupon theinnerside
forreference,arealsolisted intheMaintenance
chitemis eitherapparentorwillbedescribedin
anceManual.
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INGANDSTOWING
sthecorrespondingclampassemblyontheturn-
the"A"framecannotbesecuredto theturntable
"A"framesarehigherthantheircorresponding
urntablearms,turneitherthe right-rearjackscrew
nacounterclockwisedirectiontolowerthe
eft-rearjackscrewortheright-frontjackscrew
ssisuntilthesocketsengagetheir respectiveclamp
arelowerthanthe clampassemblies,turnoneof
sitedirectiontothatgiven aboveuntilthesockets
ampassemblies.Afterboth"A"frameshavebeen
aiseall ofthejackscrewsandsecurethemwith
positionfor loading,andattachtheload-
bolt.Thetowingbarshouldbeusedto assistin
ringtheloadingprocedure.
dsecureit inplaceonthetransporting
ntofthevehicleturnbucklestothechassishold-
rnbucklesbymeansoftheirlockingnuts.Remove
hassiseyebolt.
wingbar onthesearchlightchassisrack.
tendedhandcontrollerin theproper
nsportingvehicle.
nvascoverandstowit atasuitableloca-
hicle.
sandopensightfromthe binocular
nS498fromthebinocularmount.Collapsethe
sition,andlockit inplacebythelinkagepin.
ntuntiltheyokeis overheight-adjustmentcrank
meansof thecrankifnecessary.Nowlowerthe
okestraddlesthecrankhousing.Releasebinoc-
hecontroller,andremovethebinocularmount
.PlaceandclampsocketcoverS63inthe socket
ebinoculars,opensight,andbinocularmount
xshowninFig.15.Lockand stowthisboxin
nsportingvehicle.
edthumbscrewsontheundersideof the
resoarrangedthat releaseofthecontrollercan
sremainingattachedtothe tripodproper.The
dbythehandlesS32. Stowthecontrollerinits
rtingvehicle.
braces,collapsethelegs,andstowthe
eon thetransportingvehicle.Properstowage
mentofthetripodjackscrews.
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CHLIGHT
ntof
towingspringfromthel ugontherear
toitsstoragehookT90on theturntablearm.
esbylooseningtheclampson theturn-
htis standingonslopingorunevenground,
ovethe jackscrewlockingchainsandpartially
owingaproceduresimilartothat outlinedin
the'"A"-framesocketscanbedisengagedfrom
"framesdownwardtoanapproximatelyhori-
agetheframesfromthe jointsupportsonthe
groundunder thechassis.
rake,lowerthedrumto itsapproximate
ndresetthebrake.
upport,suchassolidground,or rockor
stsatthejack-feetlocations.Turnthesearchlight
pointedoverthejunction-boxendof thechassis.
yremovingtheirchains.Levelthechassisbyscrew-
screws.Thejackscrewsmustbeloweredtosuch
e searchlightwillberemovedfromeachofthe
esearchlightwiththedrum inthepreceding
ostaccuratelevelingforall azimuthpositions,
hatthelevelbubbleswillnot remaincentralat
nylevelingprocedure.
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HTANDCONTROLSTATION
theirretainingholesonthetripod, and
setfirmly,andapproximatelylevel,inplace.
ositionon thetripod.Exercisecarein
thereceptacleandthecenteringflangepassthrough
Rotatethecontrolleruntilthe shouldersonthe
softhecontrollerbase.Should thecontrollerbase
ller,duetoslippageofthe azimuthclutch,lift
otakeits weightoffthetripodwhilerotatingit
heshouldersengagetheholes.Securethe con-
ethreeknurledthumbscrewsonthetripodtop.
mountsocketcoverandattachittoits
ontroller.
ntcouplingS438atthelowerendofthe
eeofsandor dirt.
eholeinthe sideofthebinocular-mount
sertthebottomof thecolumnintothemount
tilthealigning slotengagesthealigningkey.
tslowly,usingaslightoscillatorymotionof
0tofindwhenthecouplingsengage.Turnbinoc-
33whilepushinginon ituntiltheclampengages
thebinocular-mountcolumninplace.Raisethe
einchwiththecrank.
linkagepinandsetthelinkagein its
cethepintolockthelinkagein thisposition.
headjustinghandlesuntilelevationindex
orthe maximumdistancebetweenthe
bincocularhingeintheslotof binocularmounting
ecesatal owerpositiontowardtheopenyokeof
ewonopensightSl6 asfaraspossible,
astenedtothe bottomofthescrewuntilit is
tbar.Insertthe indexendofthesight barinto
blockslot,andslide thebarintothe slotuntilthe
ointof thebinocularhinge.Tightentheclamp
kappliesmoderatepressureonthe binocular
cularsinplace.
embledcontrolstationbyadjustmentof
piecestoa suitableseparationforthe
nocular-mountheightwiththeadjustingcrank.
lantcontainsthe necessaryfuel,oiland
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N
breakeris intheOFFposition.Complywithin-
ePower-plantOperator'sManual.
lestothejunction-boxreceptaclesat
ssociatedreceptaclesatthepowerplant. The
gsareidentifiedbyplusand minusmarksandby
ys.Itisimpossibleto seatunassociatedpower
mpletely.Locktheplugssecurelyinplaceintheir
-nutclampsprovided.
wercablesusedaffectstheresistanceof
thevoltageatthe searchlight.Ballastresistor
rovidedsothatfixed resistancesmaybeputin
s,tapson thisresistorcanbeutilized tocom-
resistance.Properadjustmentcanbemadeby
heballastunitand attachingthecabletothe
ed"FOR200FEET,""FOR400FEET"or"FOR
gthcableisused.IRRESPECTIVEOFTHE
CABLES,ALWAYSBESURETHATTHE
WHICHENTERSTHETURNTABLEBASE
RMINALSTUDMARKED"FOR600
cablefromthejunctionboxis connectedtoits
bove.
bleplugsandreceptaclesatboththe
tioninthesamemanneras previouslyindicated
ons.Thesereceptaclesandplugsarealso pro-
andkeywaystopreventincorrectconnections.
elocator-cableplugsandreceptaclesat
cator.
srequired thatthelocator,searchlight,and
orientedtoa commonbaseline,andsynchro-
tion.Underthis instructionitisassumedthatthe
ensetup; thatnoparallaxcorrectionisbeingpro-
ll electricinterconnectionshavebeenmade;
;that searchlightazimuthandelevationclutches
HANDpositions;thata-cselectorswitchJ77
on(unlessalocatorsupplyinga-cpoweris
d beinitsEXTERNALposition);thatD.E.C.
ontrolstation isinits AUTOMATICposition;
sareclosed;and thattheamplidyneswitches
scellaneouslightingswitchesareintheirOFF
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HTANDCONTROLSTATION
edthatthepowerplanthasbeenplacedin opera-
ePower-plantOperator'sManual,andthatsupply
werreceptaclesonthe searchlightjunctionbox.
ntPoint
whichtheequipmentcanbe readilyoriented.
shesorientationbydirectingallthepertinent
dadistantpoint,suchas astarora fixedlight,
ved.Sincetheinfluenceofparallaxwillvary
etothepoint used(orientationpoint),chooseas
orientationpointinaccordancewithin-
eOperator'sManualforthatequipment.
atinglamp E30attheelevationcontrol
rakeatthe elevationcontrolbox.
rchlightdruminazimuthand elevation
s sightedatthecross-wireintersection,F23,of
E56atthe elevationcontrolboxtoits
azimuth-scaleclampingscrewsandrotate
zero pointisdirectlybeneaththeazimuthpointer.
escrews.Donotmovethesearchlightfromthe
th-correctorclampT130atthelower
pon beingassuredthatthelocatoris directed
nt,observethepositionofthe searchlight1-
atorpointerontheelevationcontrolbox.Thezero-
ersaremarkedwithluminouspaintand can,
rvedinthedark.With caretakennottomovethe
zimuthposition,observewhetherthe1-speed
theGO RIGHTortheGOLEFTsector.
rectorknobT138inthedirectionindicated
e(clockwiseforGORIGHTorcounterclockwise
ndicatorpointeris alignedwithitscenter
thepointerwillfirst moveawayfromthecenter
en returntothezero pointaftertheazimuth-
rtherinthe samedirection.Thecorrectorknob
ectionindicatedbythezero-indicator-pointer
mentmustbecontinueduntilthezeropointeris
extremelyunlikely,thatuponfirst notingthe
o-indicatorpointer,itwill beatitszero position.
ecorrectorknobineither directiontodeflectthe
proceedasinstructedabove.]Tightenthe1-
clamp.
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N
muthclutchleverA109to itsD.E.C.
loperationmustbeperformedonly
ectorisequippedwithboth1-and 33-speed(low-
nsmitters:loosen33-speedazimuth-corrector
hcontrolbox.Withcaretaken nottomovethe
zimuthposition,observewhetherthepointerof
icatorA43isin theGORIGHTorthe GOLEFT
-speedazimuth-correctorknobA203inthe
correctornameplateuntilthezero-indicator
centerindex.[Ifthepointeris initiallyatzero,or
stobethewrong direction,followtheinstruc-
raph28a(6)in connectionwiththe1-speed
enthecorrectorclamp.Afterthisadjustmentis
evershouldbelefti nitsD.E.C.position,since
tiondisengagesthegearingbetweenthesearch-
muthcontrolbox,thus breakingthemechanical
muth33-and1-speedcontroltransformers.This
ondencebetweenthesetwocontroltransformers.
benecessarytosetthesearchlightat itszero
e1-speedzero indicator,andthentorezerothe
mers.
larlocatorisusedwitha searchlight,
softheelevationtransmittersinthe locatorandthe
mersinthesearchlightasfollows:accuratelyset
vation.
a1-speedtransmitter,placeelevation
itchEl87initsLOWSPEED(1-speed)position.
nthe directionindicateduntiltheelevationzero
rumshouldnowbe atzero-milselevation.
33-and1-speedtransmitters,setthe
ro-milselevation.Placetheselectorswitchinits
osition,andturnthedruminthe directionin-
atorreadszero.The drumshouldnowbeat
withoutmovingthedrum,throwtheselector
osition.Thezeroindicatorshouldstill read
enot met,refertoParagraph64ofthese in-
evationclutchlevertoits D.E.C.posi-
witchatthe controlstationtoitsON
uthand elevationzero-readeroperators'hand-
tilthe control-stationzero-readerindicatorsare
wheelsatthese settings,andpointing
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HTANDCONTROLSTATION
telyinthesamedirectionasthecontrollerhous-
ousinginazimuthwith respecttoitsbaseand
vationbyadjustinghandlesS483 untiltheorien-
hecenterofthebinocularfield.Afteraligningthe
onpoint,repositiontheminelevationto thezero
oindexmarkon gearboxS457withindicator
thebinocularsarenotavailable,theopensight
roximatelythepropersetting ofthebinocular
.E.C.transferswitchS71totheMAN-
and elevationamplidyneswitcheson
positions,standingclearin casethesearchlight
er,thesearchlightwillnotmoveiftheforegoing
andaccuratelyfollowed.
ctionofUnits
orientationpointisnotdiscernible,the
dbytheinterdirectionofunits. Undersucha
sarytoprovidesuitableillumination.Orientation
tsasindicatedbytheprecedingdistant-point
gdetailedexceptions:
dicatedbyParagraphs28a(l) and
rdirectlyatthecenterof thesearchlightdrum;
ghtheorientationsight,ata pointapproximately
enterofthelocator.
containedinParagraph28a(5) toset
azimuthscaleat3200mils (or180degrees),
200mils (180degrees)inazimuthtoread zero,
cator.
lledforinParagraph28a(13)and (14),
d.Withthe elevationandazimuthclutchlevers
othamplidyneswitchesON,andthecontrol-
tchinitsMANUALposition,turnthesearchlight
tionhandwheelssothatitpoints directlyaway
oldingtheoperatinghandwheels,sightthe
cturer'smonogramattherearofthe drumthrough
controllerhousingandelevationmovementofthe
Returnthesearchlighttoitsoriginalpositionby
ositetothatinitiallyemployed.Thismethodwill
justmentofthe binocularswhenthesearchlight
parison.
nt,setupandorientation,acheckoftheequip-
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CHECK
erminethat itisin satisfactoryoperatingcondi-
heckprocedureareas follows:
E.C.transferswitchinitsAUTOMATIC
throughseveralrevolutionsclockwiseandcoun-
lsoupanddowntheelevationrange,andobserve
moflocatorandsearchlightcanbemaintained
iththecontrol-stationD.E.C.transferswitchinits
inewhetherthesearchlightcanbe movedin
entofthecontrol-stationzero-readeroperators'
atthebuzzer-signalcircuitsfromthecontrol
romthelocatorto thecontrolstation,andfrom
htareoperable.
ngthesearchlightbyeitherautomatic
LEAVETHEDRUM,FORMORE
ES,ELEVATEDORDEPRESSED
TALIMITSWITCHISACTU-
approximatelyindicatedbytheeleva-
ositionlimitswitchis actuatedat2200
sitionlimit switchisactuatedat 175
etothedesirabilityoftransportingthe search-
lledinthel amp,anditisthereforeassumedthat,
carbonsarenotinstalled.Priortoinstallationof
heelevationcontrolboxshouldbe placedinits
onmadeconcerningtheapparentsatisfactory
htventilatingmotorandelectricallydrivenlamp
FFthearcswitchaftercheckingfortheabove.
hestotheirOFFpositions,butLEAVE
ATIONCLUTCHHANDLESINTHEIR
edrumat itszero-elevationposition.Operate
engagedposition.Lightthe recarboninglamp
tdrumdoorfor accesstothedruminterior.
tlinedand illustratedbyFig.17.CARBONIN
AIROFCARBONS.
L384onthe lamp.Insertapositivecarbon
gofthefront glassdoorandthehole inthelamp
muntilitprojectsfrom%toJ inchbeyondthe
nosecap.Rotatethecarbontofacilitateentry
hes.Operatethepositivelevertoengagethe car-
rollers.
ersin openpositionbypushingforward
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HTANDCONTROLSTATION
n
y
-
m
everassemblyL410tothe positionshownin
nd ofanegativecarbonthroughthenegative
4inchfrom thetipofthe positivecarbon.Operate
gethecarbonwith thenegative-feedrollers.Close
erecarboning-lampswitch.
rake,andpositionthesearchlightin both
hatthezero-indicatorpointersare approximately
plidyneswitchestotheir ONpositions.
ORSUDDENMOVEMENTOF
THESESWITCHESAREOP-
rchlightvoltmeterindicatesapproximately
mmeterisatitszero point.Anyrequiredvoltage
eatthepowerplant inaccordancewithinstruc-
er-plantOperator'sManual.Failureoftheam-
equire adjustmentoftheammeterpointer.
ofground-glassfinderF29 andpeep
-drivecrankL168andpositive-feedbutton
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NTOFCARBONS
smboxareintheir lower,orout,positions.Also
ate-adjustmentknobL232onthelamp-mechanism
mumfeed.
ons
engthcarbonswhenrecarboning.Entranceto
hroughthe leftdrumaccessdoorinorderto avoid
nteringthe drum,takecarenottodrop carbons
when removinghotcarbonstubs;andhandle
voidbreakage.Onlyspecialhigh-intensitycar-
slamp.
leverbypushingits lowerendtowardthe
ouldberemovedby meansoftongs.Caution
ngthestub,toavoidthepossibilityof thestub
eheadanddroppingonthemirror.Spreadthe
apartbyraisingthepositive-carbonclamping
rbonwithapair ofrecarboningtongs.Tofacili-
arbon,it issuggestedthattheendof thenew
ed endofthepositivehead,and bepushed
ed stub.Thenewcarbonshouldbepushed
ecarbonprojectsbeyondthepositivenosecap
h.In theinitialposition,thenewcarbonwill
gatthecenterof thefrontdoor.Re-engagethe
sitive-carbonclampinglever.Insertthepointed
rboninto therearofthenegativehead,and push
s within^inchoftouchingthepositive carbon.
oorsarefullyclosed.
l
videdfurnishestwomethodsforremotedirec-
CDISTANTELECTRICCONTROLand
ICCONTROL.Thatis,thesearchlightmay
aticallyfromthelocatorormanuallyfromthe
guponthesettingofthe transferswitchatthe
ainswitchshouldbeONwhilepre-
ngtracking.Thisis necessarytopro-
ndthe indicatingsystemssothatthe
alignmentwiththe locator.
18and19indicatethe locationsofthevarious
hallbereferredto.In caseoffailureofthe
lightmaybeoperatedbyhandbyuse oftheex-
ricControl
iresthat:a-cselectorswitchJ77be inits
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CTRICCONTROL
lstation
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HTANDCONTROLSTATION
Control
ontrolstationfortrackingthetarget and
cator.The sameequipmentsetupasaboveexists
hattheD.E.C.transferswitchshouldbein its
o-readerinstrumentsatthecontrolstationwill
mbetweenthelocatorandthecontrolstation;
mentsatthesearchlight(onthe elevationcontrol
nismbetweenthecontrolstationandthesearch-
oper procedureforManualD.E.C.operation:
E.C.withhand-controloperation.
trackedbythelocator,theazimuthand
ratorsatthecontrolstationshallobservemove-
nstrumentpointers.Maintenanceofsynchronism
ontrolstationisindicatedbythe centering,or
r-instrumentpointers,andissecuredbymoving
s'handwheels.Forpropersynchronization,move-
ustbein thedirectionindicatedbytheinstruction
nstrumentwindow.Thatis,tomovethezero-
t,i tsrespectivehandwheelmustberotated
ockwiseforaleft-handmovementofthepointer.
an oppositedirectionitindicatesthatthetrans-
e controltransformeratthecontrolstation
ase.Correctionforthisconditionisobtainedby
ntinuouslyinonedirection,whichwillcausefirst
tionandthenanultimatereturnto thezeroposi-
-operators'handwheelsassmoothlyand
tofacilitatethetargetpickup.Thisis particularly
arc strikeinorderto minimizethejumpwhich
pply voltagemomentarilydecreasing.
rshouldstandby hisstationatthebinoc-
yreadilyobservetheilluminatedfieldwhenthe
cis struck,theobservermustcarefully
throughthebinoculars,inorder toascertainthe
uctionsforstrikingthearc andoperatingthe
h32 whichfollows.
otseethetargetimmediately,thezero-
xplorethefieldaroundthe positionindicatedby
irhandwheelsS258andS348,so thattheinstru-
wlyfromonesideto theotherofthezero index.
eenpickedupbytheobserver,he should
targetwiththe observer'shandwheelsSi85
zimuthhandwheelisprovidedwitha two-
edbyplungerSi88 passingthroughtheknob
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TIONALCONTROL
eeddrive,whichisengagedby pressingtheend
screwhead,is particularlyusefulinfollowing
gtarget.
owed,thebinocularsmaymovefromthe
rallaxbetweenthesearchlightandthe control
htontotheil luminatedfieldagainbymovingthe
byadjustinghandlesS483.Thesehandlesmaybe
ocularsbothin azimuthandelevation.Such
slightlyaffectthealignmentinelevationbetween
ntrolstation.
odsofD.E.C.
rationsitwillbeessentialthat transferbe
ethodsofcontrol.Thistransfermustbe accom-
ovement,orjump,ofthe searchlightbeamto
cedurefortheD.E.C.transferis outlinedbythe
pmentisoperatedfromthelocatorwith
tatargethasbeenpickedup bythelocatorandis
hlight,itmaybe desirabletoreleasethelocator
ethe searchlightandcontrolstationcontinue
This transferisobtainedbyturningcontrol-
tchS71totheMANUALposition.Detrimental
ebeamcanbepreventedif thezero-readeropera-
onthe azimuthandelevationzero-readerinstru-
istransfer.The aboveprocedureisfollowed
mpislightedor isnot.
maintainedunderManualD.E.C.andit
utomaticD.E.C.,itis essentialthatthecontrol
esodirectedthatthe zero-readerinstrumentsat
zero orthatthelocatoris broughtbackinto
controlstation.Suchreadingswillshowthat
rchlightandthelocatorare insynchronism,
vementwilloccuratthe timeoftransfer.After
tozero, turntheD.E.C.transferswitchto
rol
nddirectionalcontrolofthe searchlightcanbe
wingmanner:
azimuthclutchleversin theirHANDposi-
muthandelevationamplidyneswitches.Re-
dinserttheextendedhandcontrollerin itssocket
x.Applyaslight pressuretowardthesearchlight
untilthecouplingsmateand thelatchfallsintoits
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HTANDCONTROLSTATION
sproperlyengaged,thesearchlightwillturn
ationofthe handwheel.
controlofthesearchlightmayfollow
mentoftheextendedhandcontrollerkeepingthe
reader-instrumentpointersontheirzero positions.
struckandthetargetpickedup,manual
earchlightshouldbecontinuedbydirectobserva-
f byinstrumentindications.
orthreemethodsoflampcontrol,designated
atic,andmanual.Theautomaticcontrolisintended
emiautomaticandmanualcontrolsprovidemeans
fthelampin theeventoffailureofcertain features
eference,Fig.20indicatesthelocationof the
ampoperation.Underanycondition,makesure
arboned.(Referbacktocarboninginstructions
30.) Neverstartanoperationunlessthepositive
toprotrudeatleasttwoinchesfrom thefeedend
defrom%toJ inch beyondthenosecap.The
minalvaluesof150 amperesand78voltsas read
ents.Themethodofsettingthe abovecurrentis
efollowinglamp-operationmethods;andthe
cribedforthepowerplantby thePower-plant
ependsuponproperpositioningoftheposi-
adbeamtheoperatorshouldfrequentlycheck
tivecratertipismaintainedcloseto theblackor
assfinder.THEPOSITIVECARBONSHOULD
BURNBACKBEYONDTHEREDOR
alsodependentuponmaintenanceofproper
sshouldbecheckedfrequently.Theadjustmentis
0oftheseinstructions.CAREMUSTBEEXER-
THEPOSITIVECARBONREMAINSOF
LURETOOBSERVETHISPRECAUTION
IVECARBONBEINGFEDTOTHE
GQUICKLYBURNEDTOSUCHAN
HLIGHTWILLBECOMPLETELYOUT
ol
iresthatpositive-drivecrankL77,positive-
ative-drivecrankL168beintheir out,orlower,
edrate-adjustmentknobL232beatitsmininium-
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OL
m
-glassfindercoverF34andpeep-sightcoverF82
maccessdoorsbeclosed.Operationprocedureis
eE217).Theventilatingmotorand the
lstart rotating.Thelampmechanismwillauto-
ecarbontostrikethepositivecarbon,andthen
egativecarbontoobtainalampcurrentin accord-
djustmentofthis setting,whichshouldbefor150
tammeter,ismadeatthe lampcontrolbox,andis
raph68 andintheMaintenanceManual.
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HTANDCONTROLSTATION
rcstrike,observethroughthe peepsight
positivecarbonhasremainedapproximately
thatitis notbrokenbadlyenoughtoendangerthe
seof abadbreak,thepositive-feedrateknob
etoitsmaximum-feedposition,andthepositive-
rpositionandrotatedrapidlytobring thepositive
dthepositivenosecap.When thepositivecrater
ositive-feedrateknobshouldbeset backto
e-drivecrankreleased.
oes notautomaticallypullawayfromthe
touch,thenegativecarbonshouldberetractedby
e-drivecrankandturningitcounterclockwise
50amperes.Thenthenegative-drivecrankmay
utomaticcontrol.Ifthecarboncannotbere-
htoOFF,enterthe drum,disengagethenegative
s,andreengagethe negativecarbon.Closethearc
ethermostatpreventsunderfeedingof
esnotpreventoverfeeding.Ifthe pro-
onincreasesbeyondtheusual %to
ive-feedratebyturningthe positive-
inimum-feedposition.
s'operation,theimageofthepositive
sfinderdoesnotterminateat theblack,orfocal,
sight andobservewhethertheprotrusionofthe
oximately%inch.If theprotrusioniscorrect,
ngknobR50to bringtheendofthe imageonthe
hangefromthissettingduringoperation,immedi-
ositive-carbonlengthbyobservingwhetheritis
ead.Ifthepositivecarbonis longenoughtoro-
offthefocalline, resorttosemiautomaticoperation,
gsubparagrah.
minatingagreaterfield atshorterranges
nedbyturningthefocusingknobina counter-
movingthelampclosertothemirror.Afterthis
andredli nesontheground-glassfinderno
ce.Theoperationofthearc,therefore,mustbe
throughthepeepsight.
ontrol
ouldfail,the lampstrikeisunaffectedand
memannerasforautomaticlampcontrol;the
arbon,however,mustberegulatedbyturning
bclockwisetowarditsmaximum-feedposition.
ocausethepositivecarbonto feedatsucharate
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L
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NDTECHNICALDESCRIPTION
descriptionprovidedbythissectionrelates
stemsofthe generalsearchlightequipment.It
cquaintthereaderwith allessentialfeatures
hegeneralsearchlightequipmentisdividedinto
eyaretheGeneralArcSystem,the Zero-reader
ectric-controlSystem.Eachoftheseprimary
therbreakdownintoitssubsystemsandassemblies.
mofgeneralarcsystem
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HTANDCONTROLSTATION
stem
cludes:thesearchlightlampandlamp-con-
witch;searchlightpowerinstruments;theven-
ilspertainingtothe lampanditscontrol;and
quiredinthegeneral-arc-systemcircuit.Fig.21
eabove-mentioneditems.Referencetothisfigure
mbolswillbe madethroughoutthissubsection.
mpleteconnectiondiagramandschematicwiring
chlightequipment.
ositive-carbonrotationandforpositive-and
escribedinthefollowingtext.Notethatthe method
hepositiveand negativecarbonsemployscontact
mpheads.Feedrollers,gearing,gearing-support
noseareinsulatedfromthe current-carrying
s insulationpreventsarccurrentfrombeing
er
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AMPASSEMBLY
-
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LAMPOPERATION_
isobtainedbypropersetting ofthe
mentknobL232which,throughan eccentric
utomatic-feedcontactsL245andL246.These
greaterorlessrelativetimeof contactagainstfeed
ositive-feedmagnetfora correspondingperiod
c-feedcontactsL245andL246arein parallel,
atcontactsL441andL442(Fig. 21)sothateither
matureL273.
anualfeedisas shownfortheautomatic
atpositive-feed-magnetarmatureL273ismanual-
dbuttonL276.
utomatic-feedandretractiondriveis
pmotorLa4. Thelamp-motordriveisthrough
tonegative-clutcharmatureL151.Thenegative-
slideonthedriveshaft whichcarriesbevelgear
haftsothatit rotateswithit.Inits normalposi-
tcontactnegative-drivediskLl63a.However,
orthefeedcoil isexcited,thearmatureispulled
scontactwith diskL163adrivingitin eithera
kwisedirectiondependingonwhichcoil is
ounterclockwiserotationofthenegative-drive
rodL6,bevelgearsL4 15andL 416,wormL4 17,
tive-feed-rollergearsL403,andfinallytonegative
withthe negativecarbon.Thenegativecarbon
ed toward,thepositivecarbon.
anualfeedorretractionis asdescribed
rbonautomaticfeed,exceptthattheinitialdrive is
rotationofnegative-drivecrankL168andbevel
hare engagedbypushinginthenegative-drive
tion
luminousballofvapor,whichis formedin
arbon,atapresetpoint inrelationtothepositive
,thisis performedbyutilizingtheheat
onto controlpositive-feed-magnetarmature
used bymeansofthermostatmirrorL435(refer
heyareproperly directedonthermostatbimetal-
hesestripsbendwith heatandaresoassembled
nttemperature,thebendingis thesameinboth
hstripcarriesa contact;thesecontactsactasa
-magnetcircuit.Themirrorandthermostatare
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HTANDCONTROLSTATION
the positivecarbonthat,whenthepositive-
oint,theheat raysareequallydistributedonthe
ngeachstripanequal amountandbendingboth
ee.Underthiscondition,thethermostatcontacts
rcuitto thepositive-feedmagnetopen.The
gagedposition.Astheedgeof thecraterburns
thattheyaremoreonthe rightbimetallicstrip
windowinthe thermostathousing)thanonthe
ght striptobendmorethan theleftsothat the
handclosethecircuittothepositive-feedmagnet
ve-feed-magnetarmaturecausesthedetentto
eel,andthuscausesthe positivecarbontofeed
onfeedsforwarduntiltheheatraysagain fall
heats theleftstripand allowstherightoneto
hermostatcontacts,andtherefore,thecircuitto
Whenthefeedmagnetopens,thedetentdisengages
dthefeed ofthepositivecarbonisstopped.
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DCONTROLSTATION
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HTANDCONTROLSTATION
whichisdescribedbythedirectlyfollowingpara-
derautomaticoperationduetothe factthatthe
edcontactsL245andL246isinparallelwith the
enthethermostatcontactsarenotclosed,thefeed
peratedbytheactionofthese positive-feedcon-
ttentpositive-carbonfeed.Therateofthe feed
ob L232,butshouldneverbesetat suchahigh
ngofthe positivecarbon.Overfeedingisacondi-
erateoffeed isgreaterthantherate ofburning.]
operation,thethermostatandelectric
onsideredinoperative.Insteadofthermostat
dthroughpropersettingofpositive-feedrate-
chpositionsthepositive-feedcontactsin
losingthemand energizingthepositive-feed
dthussuitablypositioningthepositivecarbon.
n,properfeedingofthepositivecarbon
agraph37d.Note thatcontrolisprovidedonly
tivecarbon,andthat thepositivecarboncannot
eenoverfed.
rent
enegativecarboninsuchapositionwith
bonthata nominalcurrentof150amperesatthe
aintained.
hecurrentthroughthe arcdecreasesas
rclengthisthe distancefromthenegative-carbon
rater,andtheproper arclengthissuchas to
he searchlightammeterof150amperes.To
rrent,thenegativecarbonis fedforwardorback-
emechanismwhichhasbeendescribed.The
sbyarc-currentregulatorLaithroughwhich
edandretractcoils indriveclutchLa2isobtained.
magnetcoil,a pivotedarmaturewhichisat-
ullofthe coil,aspringwhichopposesthemagnetic
ontactsL100,L101,L102andL103,whichare
ntofthearmature.Whenthearccurrentis atthe
cpullonthe regulatorarmatureisexactlybal-
gulatorspring,andtheregulatorcontactsarenot
onisprovidedforeitherclutchcoil,andthe
tchtothe lampisstationary.Asthenegative
lengthincreasesandthecurrent throughregu-
RefertoFig.21),therebydecreasingits magnetic
pringovercomesthemagneticpullofthearma-
1andL102on theregulatorareclosed.These
cuittofeedcoilLl46a,causingtherevolving
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AMPOPERATION
akecontactwiththenegative-drivediskandfeed
rd.Asthecarbonmovesforward,thecurrent
untila balancedconditionexistsandthefeed
herebystoppingtheforwardmotionofthecar-
tionablepeaksofcurrentatthearclamp,retract
reverseoftheaboveprocess,causingthenega-
nuntilthe balancedconditionisreached.When
hroughthe regulatorcoil,thepullofthe spring
eedcontacts.
phexplainshowthesettingof thearc-
titsperformanceand,therefore,thearccurrent.
yintendedtogovernthe arccurrent,sothatthe
btained.Detailedinstructionsconcerningthe
orarecontainedinthe SearchlightandControl
ual.
withanegative-carbonhand-feedcontrol
ventoffailureof theforegoingautomaticsystem.
ebeengivenaboveunderParagraph37ffor
tivecarbon.Electriccontrolunderthiscondition
L174whennegative-drivecrankL168(Fig.23
eration.Thisswitchconsistsofa metalwasher
chengagesacontactpointon theterminalblock
e negative-driveclutchassembly.
maticallywhenthearcswitchis closed,
-drivecrankispushedin.Inautomaticoperation,
ed,the negativecarbonisquicklydrivenforward,
tsL101andL102controllingthefeedcoil are
ined.Whenthenegativecarbonstrikestheposi-
ighcurrentcausesthearc-currentregulatorto
ontactL100whichenergizestheretractcoilof
egativecarbonisretracteduntilthecurrent
nedbythe settingofthearc-currentregulator.
nthecurrentishigh,as atthetimeof arcstrike,
steadoftheregularretractcontactLl00.The pur-
actL103is toreducetheresistanceinserieswith
neticclutchinordertocompensateforthedrop
hehighcurrent.This insuressatisfactoryopera-
themagneticclutchduringthestrikingperiod.
uponopeningthearcswitch,thenegative
hepositivecarbon,whichwillallowaquick
krestrikingofthe arcisdesirablesothat the
ptlyafterithas beenpickedupbythelocator.)
s follows:
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HTANDCONTROLSTATION
opened,boththeventilating-fanmotor
motorbegintocoasttoa stop,whiletheregulator
Theventilating-fanmotorasitcoastsgeneratesan
feedcontactsontheregulatorareclosed,the
beactuatedbythiscurrentand willcausethe
otatingasthelamp-mechanismmotorcoaststo
dgearingina directiontofeedthenegativecar-
oncontrolbox,illustrated inFig.25,isa
tructedtoprevent'excessivecontactburning.
k-breakfeatureofthisequipmentprovidesfor
forclosingandopeningthe arccircuit.
ruments
rumentsattheelevationcontrolbox(See
ationofthe lamp,lamp-control,andventilation
mmeterandvoltmeterarerespectively0-300-
oving-coilinstruments,suitablefortheoverloads
earchlightoperation.Eachinstrumentscalehas
lineat thenormallamp-operatingpoint,andeach
hanexternalzero-adjustmentscrew.
a ventilatingsystem,shownbyFig.26,sothat
drum arecontinuouslysweptwithfreshair.The
esforadequatecoolingofthelamp-controlmech-
hrougha labyrinthinthelamp-control-box
mpisprovidedby astreamofair throughthelamp
sitivebrushesandthenose cap.Airisdrawnby
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HTANDCONTROLSTATION
dintherotor toapproachzeroandthenreverse
fthetransformerrotorlags inacounterclock-
Fig.29,the instantaneouspolarityoftheout-
meastheinstantaneouspolarityofthetrans-
mentsaretwo-elementmetersinwhichthefield
eelectricallyisolatedbutmagneticallycoupled
gofeachinstrumentisconstantlyexcitedfrom
xcitesthetransmitterrotor. Thearmaturewinding
imitedangleandthe indicatingpointerisfas-
rmaturewindingof eachinstrumentiscon-
espectivecontrol-transformerrotor.Thenormal
ointeris atthecenterofthe scale,thusindicating
armatureofthe instrumentiszeroandthat
ed.Conversely,deflectionofthepointerindicates
ure.
being controlleddirectlyfromthe
andthelocatoris movedinrelationtothe
pliedtothe searchlightzero-indicator-instru-
chlightismovedto followandcatchupwiththe
dtotheindicatorinstrumentarmaturewillbe
being controlledfromacontrolsta-
ementofthelocatorcausesavoltagetobeapplied
reader-instrumentarmature.Ifthecontrolsta-
catchupwiththelocator,thevoltageapplied
ducedtozero,regardlessofthesearchlightposi-
he pointermoveswilldependupon
neouspolarityofthe a-cexcitationtothecontrol-
e.Themagnitudeofthisvoltageisindicatedby
ris deflectedineitherdirectionfromthezero
bedeterminedfromthepositionof thepointer
limitedextent,howmuchtheequipmentmust
lignment.Thepointerandthescaleof thezero
ithluminouspaintinorder thattheymaybeob-
use ofscalelights.
s
mapartofthe zero-readersystem:
-adapterrelay(Jf)andresistor(J34and J35)
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ISCELLANEOUSDEVICES
x,Fig.4,are providedtomaintainapproxi-
yvoltagetothe dynamotorundercontrol-loadand
ation.Sincetherelaywindingisinthe searchlight
herelay contactsareclosedunderarc-loadcon-
control-loadconditions.Theresistoris placed
ycircuit,andis cutoutofthe supplycircuitunder
closingofthevoltage-adapter-relaycontacts.
matelyconstantdynamotorsupplyvoltage.A
dedon thisresistorsothat thepropera-cvoltage
ormaybeobtainedundercontrol-loadcondi-
hrowselectorswitch(J77)forcontrolofthe
dinthe junctionbox.Inadditiontocontrolling
hprovidesforconnectingthesearchlighta-c
ceofalternatingcurrentwhichmaybe furnished
externala-cisused,the switchisthrowntoits
hedynamotordoesnotoperate.
use(J60)forthe a-csupplyisinthe junction
E30)forindicatinga-csupplyavailabilityis
ntrolbox.
o preventthedynamotorfromdrawingex-
alsoin thejunctionbox.
isprovidedin theelevationcontrolboxfor
zeroindicatortoeitherthe1-speedor the33-speed
heconnectiondiagramandschematic
researchlightequipment.
TROLSYSTEM
D.E.C.
htdiffersfromtheprecedingsearchlight
toits methodofdistantelectriccontrol(D.E.C.
eseinstructionscoversadescriptionofthe means
gthesearchlight.Itisimportantthatthe oper-
efundamentalsofthis controlsystem.
rentby observingthesearchlightinopera-
distinctivefeatures.Itpermits rapidacceleration
chlightinazimuthandelevationin orderthata
getmaybemorereadilyfollowed.Itprovides
ng,steplessspeedsfortrackinga distantor
nchronization,ormeansbywhichthe searchlight
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HTANDCONTROLSTATION
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HTANDCONTROLSTATION
matControlStation
ftheD.E.C.systematthecontrolstationinclude
rol-stationcontroltransformerswhichwerede-
onwiththeZero-readerSystem;fordrivingthe
ers;andformovingthecontrollerhousingin
rsinazimuthandelevation.Thesemovementsare
dwheels.ThemechanicaldevicesforD.E.C.atthe
nFig.32, andoperateasfollows:
andbinocularsarerotatedin azimuth
operator'shandwheelS258,bevelgearsS250and
86,wormgearS308a,clutchS306,shaftS298,
yringgearS37. ClutchS306,justreferredto,per-
tobe movedinazimuthindependentlyofany
drivesideofthegeartrain. Thepurposeforsuch
ybeendiscussedinParagraph28underorientation.
beshiftedinazimuth withrespecttothecon-
lutchS447,for correctionofparallax,asalso
smovementisnotlimitedbystops,butattention
fectofsuchazimuthmovementonthepositionof
.
andbinocularsmayalsobe rotatedin
rver'shandwheelS185,throughclutchS222,and
,or S233andS261,dependinguponthedrive
sso arrangedthatshiftingplungerS188in the
angesthespeedratiobetweenthehandwheel
nazimuth.Fornormal,or distant-target,track-
positionedthatitssmoothend willbeflushwith
scase,thedrive isthroughbevelgearsS220and
o1.Whenrelativelylow handwheelspeedac-
trackingisdesired,theplungeratthe handwheel
ositedirection,thusengagingtheclutchwithbevel
rivesshaftS260throughbevelgearS261,giving a
freelyonshaftS260,is drivenfromthis
andgearsS280,S293b,S293a,andS276. The
o preventexcessivelyrapidaccelerationsandde-
ghtinazimuthunderManualD.E.C.operation,
esmoothcontrolofthe searchlightmotionin
frictionclutchin thegearingtotheflywheelis
bserver'shandwheelinits low-speedratio,itis
vertoaccelerateanddeceleratetheflywheelas
Thispermitsthesearchlightto bemovedmore
werepositivelygearedtoshaft S260.
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RIVESUBSYSTEM
smitterSa5aisdrivenin fixedrelation
wormS286,wormgearS308a,andgearsS308b
uthcontroltransformerSa6aisgeareddirectly
gearsSi7laand SlS0a.Nohand-operatedad-
eitherthetransmitteror thecontroltransformer.
adjustmentsaregivenintheMaintenanceMan-
movedin elevationaboutshaftS470
69,wormS461,shaft S442,gearsS55,S381
94andS372, shaftS350,andzero-reader'shand-
gearsS376andS351, orobserver'shandwheel
S327andS351. Thepositionofthebinocular
tS470maybe changedbylooseningthetwo
chS478.
freelyonshaftS350,is drivenfromthis
69,S388b,S388a andS366.Thisflywheelpre-
celerationsanddecelerationsofthesearchlight
D.E.C.operation,and,ingeneral,promotes
chlightmotioninthis typeofoperation.
nsmitterSa5bisdrivenin fixedrelation
wormS374,wormgearS406,andgearsS409
vationcontroltransformerSa6bisgeareddirectly
gearsSl71band SlSOb.Neitherthetransmitter
dedwithany hand-operatedadjustments.In-
djustmentsaregivenintheMaintenanceManual.
cularmountwithrespecttothecon-
stedto suittheobserver.Thisis accomplished
ormS428,wormgearS425b,pinion S425a,
m
bsystem,whichisshownin Fig.33,comprises
vingthesearchlightin azimuthandelevation.
riveninazimuthand elevationbythedrive
hichhasalreadybeendescribed.Thepowerto
nishedbytwo amplidynemotor-generatorsets,
irectlydrivinganamplidynegenerator.The
theoutputcurrentof eachamplidynegenerator
uppliedtoits controlfield.Thesourceofthis
edin alaterparagraphofthis section.
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EMOTOR-GENERATOR
oad.Thevalueof thiscurrentisdirectlypropor-
tageandinverselyproportionalto thearmature-
rentthroughthearmaturewindingsproduces,
agneticlinesof force)whichisalwaysatright
lux;itis stationary,eventhoughthearmatureis
eforcethatproducesthisarmaturefluxiscalled
theordinarygenerator,isa nuisance,preventing
mptsusuallyaremadetoneutralizearmature-
lidynegenerator,however,thisarmature-reaction
.
ort-circuited,theexternalresistance
alarmature-circuitresistancewouldbeverylow.
recurrentisinverselyproportionaltothis
ta verysmallcontrol-fieldfluxwouldcause
d,consequently,ahigharmature-reactionflux.
hastobuild uponlytoa lowvalueandthe
cuitedarmatureisverylow,fullloadcurrentwill
nallyshorttime.
fluxmaybeutilizedbyaddinganother
lestotheshort-circuitedbrushes,asshownin
mature-reactionfluxinducesavoltageinthearma-
"load-axis"brushes.Ifa resistanceloadis
xisbrushes,thecurrentthroughthisloadwill
mplitude,thefluctuationsofthe currentflowing
oil.
TIONAL
DGENERATOR
....
AD
YNEGENERATOR
generatortheory
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HTANDCONTROLSTATION
eratureofthecathodeto thepointwhereitfreely
shell surroundingthecathode.Aslong
atapositivepotentialwithrespectto thecathode,
mthecathodewillbeattractedto theplate.The
thecathodeto'theplate constitutesanelectric
flow,fromtheconventionalviewpoint,isopposite
theelectriccurrentflowsfromtheplateto the
spiralwindingof wireextendingthe
edbetweenthecathodeandtheplate.The spacing
comparativelylarge,so,mechanically,thecon-
ablyobstructtheelectronflow.Thepurposeof
ol,electrically,theflowofelectronstotheplate.
egativepotentialwithrespecttothe cathode,the
reduced,sincethenegativechargeonthecon-
electronsbacktowardthecathode.Asthecon-
glynegativerelativetothecathode,theelectron
dwhenthegrid ismadelessnegative,theelec-
ce,whenthecontrol-gridvoltageisvariedin
theplatecurrentalsovarieswith thesignal.Be-
voltagecancontrolacomparativelylargeamount
s "amplified"bythetube.
spiral windingofwireplacedbetween
ate.Itismaintainedat apositivepotentialwith
tsinceits turnsareshadedfromthecathodebythe
elyfewelectronshitthescreengrid.Hence,the
omparedwiththeplatecurrent.Thepurposeof
theplatecurrentpracticallyindependentofthe
ratingrange.Thescreengrid alsoactsasanelectro-
ontrolgridandthe plate,thusreducingthegrid-
esetwoeffectsallowgreateramplificationtobe
es(8a)areverticalmetalshieldswhich
reengridandthe plateatoppositesidesof the
-formingplatesareinternallyconnectedtothe
eseplatesisto concentratetheelectronsintoa
scomingfromthecathodehittheplate athigh
edislodgedfromthemetaloftheplate. Theseare
rons,andthephenomenonassecondaryemission.
omthecathodetravelto theplateina well-de-
yelectronsarerepelledbacktotheplate.Other-
dtraveltothescreengrid, therebyloweringthe
ngthescreen-gridcurrent.
hotduringoperation,andcautionshould
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HTANDCONTROLSTATION
omthecorrespondencepointislessthanthe above
iseffectiveincontrollingthe system.Atthesame
signalisalsobeing appliedtothecontrol-grid
henthedisplacementfromcorrespondence
alue,the 1-speedsignalisofsuchmagnitude
hecontrolsystemis notappreciablyaffectedby
edsignal.
ManualD.E.C.
endesignedsothatthe searchlightwilloperate
ombined1-and33-speedcontrol,orwith1-speed
emoperatessolelywith1-speedcontrol.No
orusingthe 33-speedcontrolalone.
ithmostautomaticcontrolsystems,tendsto
epointof correspondenceunlessmeansarepro-
dency.Huntingisdueto thefactthat,asthe
ecorrespondencepoint,theoutputvoltagesofthe
easeuntiltheyreachzeroatthepoint ofcorre-
powerinputto thedrivemotordecreasesuntilit
encepoint.However,theinertiaofthe rotating
htslightlybeyondthepoint ofcorrespondence.
tputvoltagesofthecontroltransformerstoin-
snowsuch astocausethesearchlighttobe driven
spondence.Repetitionofthisactionconstitutes
einertiaoftherotatingparts ofthesearchlight,the
dynegeneratorisappliedto theantihuntcircuit
ctionsaresomadethat thepolarityofthisanti-
hasto opposethecontrol-transformervoltages
agramoftheD.E.C.ProtectiveSubsystemis
ystemcomprisesanetworkof miscellaneous
elaysasdescribedbelow:
kswitches(F10,Fll)aremountedatthe
angedthatitis necessaryforbothofthedrum
ther theazimuthorelevationD.E.C.system
itchesareprovidedtopreventaccidentaldirec-
henanoperatorisinsidethedrum.
134ismountedinthe azimuthcontrolbox
zimuthclutchleverto theD.E.C.position,it
eazimuthcontrolcontactorA28.Theprime
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TVESUBSYSTEM
mofprotectivesubsystem
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NALPRECAUTIONS
lows thesystemtooperatesoas todepress
tswitchE399a.Asimilarconditionoccurswhen
htocloselower-limitswitchE399b,thereby
ingseleniumrectifierE38()b.
minthe amplidynegenerator,thedrummay
switchhas closeduntilitcomestorest against
actionisnormalandwill notharmtheequipment.
S44whichmaybelocatedinthe main
cdiagrams(Fig.71and72),arelocatedinthe
ndthecontrolstation,respectively,andarecon-
uzzersareoperatedby meansofbuzzerswitch
r byabuzzerswitchat thelocator.Thepurpose
providemeansforsignallingfromthe control
rfrom thelocatortothesearchlightandcontrol
eprotectivedevices,eachamplidynemotor-
witha thermostaticallyoperatedoverload
hisisa single-pole,single-throwswitchmounted
ectedtoterminalsOLlandOJL2.The switchopens
eraturereachestoohighavalue,andreclosesauto-
coolsdown.
onamplidynemotorisin serieswiththeeleva-
switchC265intheazimuthamplidyneis inseries
ecircuit.Operationoftheswitchopensthe
ntrolcontactor,renderingthecorresponding
e.
s
kswitcheswhichcomprisetheProtectiveSub-
eprotectionagainstinjurytopersonnelordamage
properoperation,theycannottakethe placeof
art oftheoperator.Twopointsareparticularly
HDRIVESTHESEARCHLIGHT
ONHASSUFFICIENTPOWERTOIN-
APERSONINAPOSITIONTOOB-
ESHOULDBETAKEN,THEREFORE,
RECLEAROFTHESEARCHLIGHTWHEN-
ELYTOMOVEUNDERD.E.C.OPERA-
movingrapidlyin eitherazimuthor
440voltsmayexistinthedrivecircuits.These
dbytheamplidynegenerators,andarecarried
tbythewiringhavingits terminalsmarkedCl
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TANDCONTROLSTATION
onchii
onb*sc
nlumUblc
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ON,TABLES
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HTANDCONTROLSTATION
oncontrolsbtion
oncontroller
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TROLTRANSFORMER
elevationhigh-ipeedcontroltraniformer
-cyclea-cpowersourcetopoints51
edwire(jumper)frompoint 51to
aybeused asthesourceofa-c
supplytoit andplacingthea-cselectorswitch
osition.Thed-csupplyshouldbe suchthat
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HTANDCONTROLSTATION
gagesin position
olts
eadwithrespectto thepositive.Theproper
yinsertingthealignmentgagesinto thelamp,
houlderattheendof thetaperedsectionofthe
houldbeflushwiththe frontofthepositivenose
everL410asecuredasindicated,turnnegative
negativegageuntilitstaperedtip justtouches
tivegage.Thebottomedgesofthetwotips should
tip shouldbeonaverticalline throughthecenter
etyprecaution,nod-cpowershouldbesupplied
eckingthealignment.
sion
ation,thepositivecarbonshouldproject%
osecap.Ifthe protrusionofthepositivecarbon
tatmirrorL435should beadjustedasfollows:
tweenthe positiveintermittent-feedcontacts
dL243in thelamp-mechanismbox,Fig.65.
easttenminutes.Whilethearc ison,
matureL273ofthe positive-feedmagnetLa5
nearlyregularintervals.Ashasbeen explained
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TANDCONTROLSTATION
thatitdoesnotslip duringnormaloperationof
zero-reader'shandwheels.Ontheotherhand,it
preventthe controllerhousingfrombeing
gorientation.Toadjust theclutch,itis necessary
o-readerinstrumentanditsmountingbracket
gonalnutS304which isonverticalshaft S298
gpressure.
th-flywheelClutch
gearingtotheazimuthflywheel,S273,should
server'shandwheelinitslow-speedratio,it is
vertoaccelerateanddeceleratethe flywheelas
Toadjustthis clutch,turntheroundknurlednut
ngthe clutchspringpressure.
teallcircumstancesandcombinationsofcir-
usefaultyoperationofthesearchlightequipment.
andtheircorrectionsmentionedin thisManual
beeasilydetectedandwhichcanbe correctedby
moredetaileddiscussionoftroublesand their
uldbemadetotheMaintenanceManual.
rovidedinthespare-partsandtool boxisa
mmeter,andohmmeter.Itwill befoundindispen-
ndcheckingthe variouselectriccircuits.This
eable tocheckallthe differenttypesofcircuits,
ngesofsensitivity.Caremustalwaysbe exercised
rlyconnectedandadjustedfor measuringsafely
s,currents,orresistancesdesired.A frontviewof
g.57.
readings,connectthetestleadsto the
NEG.TurntheA.C./D.C.knobtothe desired
eselector (thelargecenterdial)to thedesired
sured.In casethevoltagetobe checkedisun-
000 voltsandreducetherangesuccessivelyto
ts,or2.5volts,ifthe priorreadingindicatedthat
tbe greaterthanthehighestvalueofthe next
gd-cvoltage,makesurethatthe POScordgoes
circuittobe read.Besuretoread theproperscale.
rrentnot inexcessof10amperes,con-
erminalsmarked"10A.+".Formeasurement
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POPERATION
milliamperes(one-halfampere),connectthetest
terminals,turntheknobtoD.C.,and turnthe
edmilliampererange.ReadtheD.C.scale,mul-
ythe properfactor.Itisrecommendedthatthese
easurementarenotused,however,unlessacheck
ampererangeindicatesthatthecurrentislessthan
,turntheA.C./D.C.knobtoitsD.C.
eadstothe POSandNEGterminals,andturnthe
edposition.Threepositionsare provided:
The1,100,and1000are thefactorsbywhich
heohmsscalehas tobemultipliedtoobtain
e.Eachtimebeforemeasuringtheresistanceofa
testrodsfirmlytogetherandadjustthe ZERO
erindicateszeroat theextremerightendofthe
n
aultylampoperation,withcrossreferencesto
relistedinthe followingtable:
otstrikeor feed,
aftturning.
aftnotturning.
otretractafterautomaticstrike,
aftturning.
aftnotturning.
tstoofar,breakingthearc.
backandforth.
trotatewhenpositivehead
yandgivesoffsoot.
rethan150amperes,
sthan150 amperes,
o great.
(Seealso"g"and"h"above)
hanJ -inch(judgedthrough
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HTANDCONTROLSTATION
malarc
ceof
thatofthesolid carbonshell,thegasvaporex-
edbythe shell.Inorderto maintainacraterwall
tivecarboniscontinuouslyrotated.Theball of
aterisfurther confinedbythestreamofhigh-
nsdirectedagainstitfromthetipof thenegative
otographofthe normalhigh-intensityarc,
chofthecrosssectionofthearc. Itwillbenoted
duetothe angleatwhichitis directedtowardthe
)capstheball ofgas,andalso(2) causesgas
heso-called"tail flame."
fthegases inthecraterwillincreasewiththe
hecrater,the greatestintrinsicbrilliancywill
craterwherethedepthisgreatest.In thesame
amcandlepowerofthesearchlightistobefound
.Thebeamcandlepowerisdependentuponthe
riesas theratioofthe areaofthereflectortothe
ositivecarbon.
ectorDiameter
centgasballmaybe consideredasradiating
eraysthatstrike themirrorarereflectedfromit
chlight.Thisbeamismadeupof thesolidangleof
essubtendedbythemirror.Thebeamis,there-
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1
1
8
nSubsystem77
ems84
tem66
tion72
t71
ation73
ht71
stem73
tor74
em86
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