Tm 9-1653 Data Transmission System m6, 1942

8/13/2019 Tm 9-1653 Data Transmission System m6, 1942

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ctedmatter Theinformationcontainedinre-

eessentialcharacteristicsofrestrictedmateriel

n knowntobeinthe serviceoftheUnitedStates

edloyaltyanddiscretionwho arecooperatingin

notbecommunicatedtothepublicor tothepress

arypublicrelationsagencies.(Seea/soparagraph

mber1942.)

NELONLY

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1942

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onofthe

19-23

24-32

r33-42

mbly43-51

climatic

trations

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rthe informationandguidanceof

ersonnel.Itcontainsdetailedinstructionsfor

assembly,maintenance,andrepairofthe

mM6,supplementarytothoseintheField

eparedfortheusingarm.Additionaldescrip-

sareincludedto aidinprovidingacomplete

materiel.

ystemM6is forusewiththe90-mm.

stemnormallyservesafour gunbattery,

aybeusedequallywellwith asmaller

mis similartothedatatransmissionsystem

unmountswere equipped.

ystemoperatesasoneunit ofthecomplete

chincludesaheightfinderandan A.A.

a(firingazimuth,quadrantelevation,and

battery,originateattheA.A.director,and

ordials.Thedatatransmissionsystem

eadingselectricallytoindicatordialson

Handwheeloperatorsatthecorresponding

rsontheindicatordials toapplythedatato

nsmissionarrangementisusedbetweenthe

irector.

5volts,60 cycles,alternatingcurrent)

nsmissionsystemis suppliedbyagasoline-

ntgeneratingunit,M6orM4.Thesegenerating

ratetechnicalmanuals.SeesectionX.

ththissystemisfuzesetter M13(pre-

hisfuzesetteris describedinaseoarate

tionX.


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TEMM6

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andrepeaters4

catorM411

ntofoff-carriagecomponentsisshownin

ponentsforonegunareshowninfigure 3.

gs.7 and8)connectsthedirectorand

bycableandplugassemblies.Theactual

gecablesconnectedtothemain junction

ownin figure2,dependingontherelative

ectedequipment.Thecableandplugassembly

tfindertothedirectordoes notpassthrough

roughtintothe guncarriagethrougha

chispartof thecontactringassemblyand

tionary)part ofthecarriage.Thecable

ring assembly,whichprovidesasliding

boxontheupper (revolving)partofthe

ingofthecableasthegun istraversed.The

rminalbox (fig.11)arelocatedcentrally

nt.

nalbox endsinaplug whichfitsinto

unctionbox(fig. 12).Thegunjunction

rwhichprovidesa6-voltpowersourcefor

psintheazimuthand elevationindicators


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BLY

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Y

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muthandElevationIndicatorsM4

echlight (fig.16).Thetwocablesfrom

uted totherightand leftsidesofthe

econduits,oneleadingtotheelevationindi-

junctionbox.

g.13) ontheleftsideof thecarriage

hefuzesetter isconnected,andaclamp

gthebreechlight.Aconduitand cablelead

dicatorsM4areidentical.Theyare

readeasilyand convenientlybytheazimuth


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TEMM6

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epeatersUsedin

4

operatorsofthegun.Theazimuthindicator

eandtheelevationindicatoronthe right

nfigure4.

MITTERSANDREPEATERS.

nsmissionsystemis basedontheuse

mittersandrepeaters.Thetransmittersand

ernatingcurrent.Foreachelementofdata

,analternating-currentsynchronoustrans-

ting-currentsynchronousrepeaters,andcon-

ed.Transmittersandrepeatersaresimilarin

esameelectricalconstruction.Repeatersofthe

andelevationindicatorareshowninfigure5.

erepeaterwith thenecessaryelectrical

hematicallyinfigure6.Itwillbe noticedthat

tersresemblesmallelectricmotors.How-

donotrevolvecontinuously,asin thecase

definiteangularpositionwhichisdetermined

smitterarmatureshaft.Therepeaterarmature

fthetransmitterarmatureshaft.Thetrans-

rector,andhasitsarmatureshaftpositioned

herein.Asthecomputeddatachanges,the

telyandtherebyprovidesacontinuous,definite

eddata.

sticofthistypeofdatatransmissionis

eshaftautomaticallyresets(synchronizes)

arpositionwith respecttothetransmitter


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S

E

ansmitterandRepeater

d.Becauseofthischaracteristic,thesystem

us."

amedata todifferentpoints,several

edinmultipletoa singletransmitter.Each

ghitwereseparatelyconnected,andisnot

atersexceptundercertainabnormalcondi-

VI.

gs.7 and8)isentirelyportableand

enientpositiontoaccommodatethedesired

irector.Itconsistsof adecagonalcast

ovablecover.Thebodysupportssix19

ainsanannularterminalring.Assembledand

njunctionboxareshownin figure17.

eptaclesCS6703(fig.18)arepainted

doneispaintedgreenfor thedirectorcable.

9409(fig.19)withmalecontactfingersis

ercablefromthe generatingunit.Thecover


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ox(D28880J

wtheunitsto beconnectedtovariousre-

ecoverinthecorrectrelationtothe bodyis

Gasketsunderthe coverandreceptacles

nnectionsforassemblingcablestothe

wninfigure 20.Thisfigureisarrangedto

receptacleshavemalecontactfingers,and

pringterminals.

ns20 terminalplatesforinterconnecting

heseterminalplatesaremarkedwithnumerals

eralsontheterminalsof theconductors.The

owshowthe variousreceptaclesareinter-

minalring.Allfourgunreceptaclesarewired

alsandsymbolsto designatetheconductors


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oxwithCoversRemoved

mployedin accordancewiththefollowing

.

arse.

volts.

5volts.

forconnectionoftheportablecable to

by thefixedendofthe contactringcable

consistsof acylindricalhousing,which

shrigging assembly,andaterminalsegment


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EMM6

Mounf

dsectionedviewsofthecontactringare

othefixedundercarriageinthecenterof

eadingto thecontactringfromtherecep

ntisconnectedtotheterminalplatesin the

blyandtheseterminalplatesarein turn

gcontactscrewsinthebrushrigging assembly.

volveswithinthebrushrigging assembly

swiththe springbrushescontainedtherein.

he20 conductorsleadingfromthespindle

dconnectedinaccordancewiththecoding

erminalsare connectedtothecorresponding

inalbox(fig.30).

inaccordancewiththewiringdiagram

) mountsdirectlyoverthecontactring

ctringspindle.Thecableleading fromthe


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TEMM6

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otheterminalson theterminalstrips,(figs.

minalsareinturn wiredthroughanother

unctionbox.

ableandhasagasketforwaterproofing.

etweentheterminalboxflangeandthesup-

carriage.

s.12 and33)hasa rectangularbody

r.Thetopcoveris sealedbyagasket.The

tedwitha drainplugcontainingafiberglass

69409(fig.19) onthefrontofthe gun

matingplugofthe cable(fig.32)fromthe

clecoverisscrewedontothedummyrecep-

danglingwhenthecableisconnected.

eptacle(fig.34)and alightswitch

untedonthefront ofthebox.

ngglandstoaccommodatetheconduit

ductors.

area step-downtransformerandtwo

eterminalstrips carrystampedterminal

ncewiththewiringdiagramshownin figure

their attachedwirescanbeliftedoutof

removed.

gs.13 and37)hasacircularbody and

overissealedbya gasket.Thesumpinthe

dwithadrainplug containingafiberglass

77962(fig.38) receivesthematingplug

setter.

glandsto accommodatetheconduit

doutgoingconductors,andacableclampto

ghtcable.

are twoterminalstrips(fig.39).The

pedterminalplatesforwiringin accordance

owninfigure 47.


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SEREPEATER)

ElevationIndicator,M4

reboltedto therepeaterhousings.Thead-

edbyslottedflexibleshafts,accessibleoutside

foradjusting theupper(coarse)repeater

ht-handsideoftheindicatorandis acces-

ckcoverisswung open.Theslottedshaft

e)repeateris locatedonthelowerleft-

nd isaccessiblewhentheslidingcoveris

repurposelyadjustedat assemblytoturn

ibilityofaccidentalchanges.Stopscrewsare

eeth forlimitingtheadjustingmotion,to

ngtherepeaterwiring.To permitlargerad-

ommodatedwiththeslottedshafts,theinner

earrangedsoas tobeshiftedreadily,relative

ectiverepeaterswhenthethreeclamping

loosened.

terhasassembledonitsshaftthe inner


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heannular outerindex(fig.41)rotates

erindex.Thisouterindexis drivenfrom

driveofthe mount,throughadifferential

adjustmentsfororientingpurposesareintro-

andouter fineindexesisinthe ratioof1

o)changeinelevationorazimuth.Each

singleindexgraduationandtogetherthey

erelementsofa follow-the-pointersystem.

andtransmittedanglesisindicatedwhenthe

ched.Theouterindexalsoindicatesangular

tionsoftheouter(fine) scale,whichisgradu-

numberedat 10-milintervals.

eaterdrives theinnerindexforthe

arouterindexrotatesconcentricallywiththe

exis drivenbyawormfromthegear on

heinner andouter(coarse)indexesisin

0mils(1:1 ratio)changeinelevationor

e)scaleisgraduatedandnumbered(final

tervalstoprovidea coarseindication.

dtotheindicatordrivemechanismofthe

suchthat thedriveshaftmakes1turn for

ninazimuth,orelevation,asthe casemaybe.

ctingtheshaftwiththe correspondingdrive

rt ofthemount,notofthe datatransmission

anicaldrivesothatthe coarseandfine

actualazimuthorelevationofthe gunis

ntialgearmechanism(fig.41).Anysuch

bymeansofthemechanicalindexadjusting

toothededgeengagedbythedetentto

onceadjusted.Theknobisaccessiblewhen

caseoftheazimuthindicatorthis adjust-

timethe batteryisemplaced.Theelevation

essuchadjustmentonlyonce,wheninitially

dicatorishousedisweathertight.The

a suitableoilseal.Thewindowframeis

oftheinstrument,andis sealedbyagasket.

erableglassandis heldinplacebya

escaleand indexes.Twoarelocatedin

ft-handsidewhenfacingtheindicatorand

ntheright-handside. Forreplacementof


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,reflectorsareremovablebymeansof 4

right-handside,theshieldmayberemoved

top.Theselampsare standard6-8volt,2-3

G-6,(%-inch)bulbanddoublecontactbayo-

heindexesarepaintedwithluminous

thewiringoftheseindicatorsand the

atedtherewith.Theplatesontheterminal

erminalblockisassembledtothe cover

henthecoveris swungdown.

ntedontheguncarriageasshownin

sectionedviewsofthebreechlightare shown

breechlightbracketcontainstwo6-8

1)withG-3Vi,(%6-inch)bulband bayonet

edina receptacleassemblywhichisreadily

replacement.Thereceptacleassemblythreads

andis lockedbyaclampingscrewinthe

ntplasticcarriesthe lightfromthelamp

.Thisrod hasapeculiarpropertywhich

oundbendsandcorners.Therodis furnished

eassembly.Thetubeassemblyisheldinthe

dwhichpreventsentranceofmoistureto

heoff-carriagewiringare 20-conductor

.Eachcompletecableassembly(fig.43)in-

mblyC69778(fig.44)ononeend andaplug

ontheother.The receptaclehasmale

ughasmatingspring terminals.Contactfingers

ed.Theindividualconductorsareidentified

edtothecontactfingersand terminalsaccord-

gure46.


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ssembly(C56703JforMainJunctionBox

ssembly(C69409JforMainJunctionBox,

eptacleBox


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LE

LEAD

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EAD)

OTECTOPENING-

ACE

N

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oxAssembledViewsandCrossSection


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ptacleforGunJunctionBox

tacleforGunJunctionBox


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gramShowingArrangementof

tingDevices


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ramShowingGearingforOuterIndexes


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SSIONCABLE

DUCTORS

ALS

DUCTORS

ACE

RACE

E

CE

ACE

E

E

CE

E

CE

ACE

for20ConductorCable


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4

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ECH

OGETHER,SOLDERED

E;

ACTRING

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4

(fig.49)arefurnishedas accessoriesfor

nge:0-15and0-150volts.

ge:0-3and0-15amperes.

:0-10and0-1,000ohms.

eterareofthe movableironvanetype,

cent.Thevoltmeterandammeterarefurnished

erleadsbeingheavierthan thoseforthe

equirecareinselectionoftheproper voltage

f highervoltageorcurrentthanthatmarked

burn outthemeteror bendthemeter

thehighest rangefirst.Theammetermust

h,neveracross,theline.

et-sizeinstrumentforcontinuityand

urnishedwithtestleadsand aninternalIVa-

ructionsforuseareprinted onthebackcover

rcompensatingforchangeinbatteryvoltage,

agneticshuntisprovided.Thisshuntis to

eriesofreadingsso thatthemeterreadszero

orted.(Thebatteryrequiresreplacementif

stedtozeroreading.)Inusing the10-ohm

nalsareshortedby thelinkprovided.The

edifconnectedtoalivecircuit;it istherefore

movedfromthesystembeforeusing the

ERMl.

whenthedata transmissionsystemis

dpowerlinesor sourceofpowerotherthan

nit.Itis issuedonlyonspecificrequestof


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and M6,designedforusewiththe data

orporateatimedelayfeaturewhichappliesa

alsecondsbeforethefullvoltageis applied.

synchronoustransmittersandrepeatersto

ositionsslowly.

llvoltage,asfroma powerline,might

s:

tingrapidly,mightpickupsynchronous

tis,continuetorun athighspeedasa motor.

inreverseas arepeater,mightliftits

utingdevice)andthenallowit tosnap

msurface.

e currentfrompostorcommercialpower

ransmissionsystem,thevoltagecontroller

ssible damagefromtheabovementioned

ollerincorporatesatimedelayfeaturesimilar

nit.

peratesfromsingle-phasealternating-cur-

0cycles.

infigure50.

foreachof theportablecables,are

nsmissionsystem.

ereel,placetheplugor receptacleendof

lipatthecenterof thereeldrum.Laythe

epressionand startthefirstfewturns at

windingthefirstfewturns,checkto seethat

strained.Whenthefirstfewturnshave

y,continuetowindthecableinclose,even

engthisonthe reel.

sforusein repairingcablesofthedata

tconsistsofa conventionalportabletool

erandvarioustoolsandsuppliesnecessary

tionsandsheathrepairsonmultipleconductor

mpletesetofinstructionscoveringtheuseof

theequipmentcomprisingthekitasin-


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eringironof thekitareelectrically

orfrompowersuppliedby thegenerating

tpresent hasnoreceptacletoreceivethe

tools,butwillbe modifiedinthenearfuture

acles.Untilthesereceptaclesareadded,

nbemadeby connectingtheappliancewires

erearoftheinstrumentpanel voltmeter.With

onthemainswitchdoesnotcontrolthepower

he generatingunitmustbeshutdownwhen

ngthewires.

urnishedwith thesystemplugsintothe

unjunctionbox.


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materials20

es22

cators23

tedyellow,locatedontherearof the

dforconnectionoftheportablecable.As all

eenergized,itis necessarythatnodirectcable

efromtothedirector,heightfinder,orgun

tionshouldbemadeonlytotheyellowrecep-

box.Failureto observethisprecautionwill

ynchronoustransmittersandrepeatersinthe

otherwiseresultinseveredamagetothe

ERVINGMATERIALS.

ftinstrumentsandmachineguns(for

required).

cial(GREASE,special,lowtempera-

eregreaseis required).

rcleaningmetalcomponents).

gorALCOHOL,ethyl(forcleaning

aningindicatorwindows).

rd.

edwiththedatatransmissionsystemM6

btainable.Theimportanceofgivingthe

ecannotbeoveremphasized.

withstandrepeatedkinkingortwisting.

nashort radius,orallowingitto chafe

clesto runoverunprotectedcables.


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TEMM6

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reelsprovidedforthem,andprotectthe

notinuse. Storeinacool,darkplace.Heat

eteriorationofrubber.

kindtoaccumulateinthe plugsorrecep-

econnectionsaccomplishedbythem.

connected,closeallplugsandreceptacles

oasto excludedirtandmoisture.

nected,thematingplugsand receptacles

uredtogetherbymeansoftheroundnut

screwthecoverstogethertoprotectthe

able,graspthebodyofthe plugtopull

eorspring.

essarytotapetheendsofanyof the

cables,userubbertapeonly.Thesolventin

ontapewill intimedissolvethelatexin-

mentaltorubber;careshouldthereforebe

ablesare keptfreeofthesematerials.Ifoil or

bber,wipeitoffandwash theplacewith

NALBOXES.

variousboxesfastenedtightlyatalltimes

tandmoistureinto theboxes.

sarytoremovethecoverfroma box,care

amagethegasket.If thegasketisdamaged,

ertomaintainawatertightseal.

ontheboxesbymeansof thecoverspro-

nthecablesare notpluggedin.

ebottomof thecontactringhousing,

moisturewhichmighthavecondensedin

blyonly,lightlylubricatethebushingsat

ng spindlewithGREASE,lubricating,

TIONINDICATORS.

rtto "runaway,"thatis,runas amotor

utoffthe poweronthesystemimmediately.


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sedat alltimesexceptwhenactually

pairswhichrequirethatthecoversbe open.

topreventdamagingthegasketswhen

frame,ortheright sidecover.Ifagasket

placedinordertomaintainawatertightseal.

enotpermittedtolubricatethe indicator.

ntenancepersonnelshouldlubricateball

sandallothersliding surfacesoftheindicator

special.Thebearingsandsurfacesshould

blywithabrush.A fewdropsofOIL,lubrica-

tsandmachineguns,shouldbeplacedon

reshaftsenter thehousing.Repeatersare

adeto wipethewindowwiththehand

ueduseofa cleaningclothwillscratchthe

o seethrough.Removedustwithacamel

aper.Removeoilorgreaseby applyingliquid

olsparinglywithcamelhair brushandwiping


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TEMM6

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S

6

ction27

ess,appearance,etc28

es29

elevationindicator30

ION.

poseofdeterminingtheconditionofthe

ystem,whetherrepairsoradjustmentsare

ecessarytoplacethesystemin serviceable

ormedonthe systemisabasicinspection

ofthesystemand tolocatebasicfaults.

scontainedinthissectionareinstructionsfor

tofthis inspection,properdispositionofthe

ecessaryactiontakenorrecommended.

7228andO.O.F.7229,fig.52)areprovided

the inspection.Instructionsconcerningthe

ntedonthebackofthe form.

andcorrectioninstructionsinSectionVI

umentrepairmanifthe basicinspectionshows

ts.Fromthesedetailedinstructionsthere-

performsthespecificrepairrequiredto place

blecondition.Theprocedurefordetailedin-

ayvarywitheachsystem,dependingonthe

cinspection.Inspectionformsandmethods

edetailedinspectionaredescribedin

de,TheInstrumentRepairman."

rrors,arespecifiedwherenecessarytoindi-

cyrequiredinperformingcertainadjustments.


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S

EMATERIAL,

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TEMM6

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sconsideredunserviceableiftheerror inany

tolerance.However,itmustberealized

eisintendedtoserve mainlyasaguidefor

supplementedbygoodjudgmenton thepart

erancesdonotnecessarilyinferthatthe

uldnotattempttoreducetheerrors tolower

nspermit.

EMENTS.

nspectionforthedatatransmissionsystem

theentire systemconnectedtothegener-

yadjusteddirector,heightfinderandthe

ncanbereadilyperformedat thegunbat-

atatransmissionsysteminthe field.The

nwillthenincludethefollowingtests:

NJUNCTIONBoxANDON-CARRIAGE

SS,APPEARANCE,MECHANICALCONDITION,

SOFFOLLOWERS,ETC.

torsbetweencorrespondinglynumbered

edcircuits).

betweenallseparateconductors(noihort

nthe plugsandreceptacles.

ceptaclecovers.

dreceptacle.

TIONINDICATORSM4.

devices(slottedflexibleadjustingshafts

b).

indexes.

al(outer)indexes.

CHRONOUSREPEATERSINTHEFIVEPRIN-

ONCHANNELS(FINEAZIMUTH,COARSEAZI-

COARSEELEVATION,FUZE).

onasconnectedtransmitter.

orintermittentfaults.

mpingdeviceinrepeater.

ssibletoperformthebasic inspectionby

cribedabove.Inthiscase itwillbenecessary

unitformechanicalconditionandforcon-


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S

ngconnections.Itcanbeassumedthatif

anicalandelectricalrequirements,andis

dproperly,thecompletedsystemwillfunction

ORINSPECTION.

electricalfundamentals.

ment(par.14).

heseareinthe instrumentrepairkit

emaintenancecompanies.)

eList(SNL)F-222(tocheckcomplete-

MPLETENESS,APPEARANCE,ETC.

ersofthe azimuthandelevationindicators

eofindicator)andanyadditionaldata

tification.

letenessofthesystem,andforcomplete-

uipment.RefertoStandardNomenclatureList

elistingof thesystemcomponents.

nboxandon-carriagepartsfor complete-

echanicalcondition.Seethatplugand re-

e,whereprovided,andthattheythread

eceptaclebody.Noteanysignsofabuse

torngaskets,etc.

ertightness.Anunbrokenfilmofpaint

lgenerallyindicatethata propersealexists.

ovethecoveroverthejointand examine

erdefects.Trythepackingglandfollowers

heinspection,whenpowerhasbeenap-

lluminationinthe azimuthandelevation

echlight,andtroublelamp.Trythe action

gunjunctionbox.

ABLECABLES.

thforcutsor tears.(Damagefromcuts

thatevenaslightcut ortearmayeventually

able.Sheathrepairsshouldbemadeassoon


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TEMM6

unMountMl)

nuityofall conductorsbetweencorre-

tacts(noopenorcrossedcircuits).Usethe

10ohm)settingfor thistest.Placethecable

ogetherandremovetheplugandreceptacle

ertestprodintothe plugterminalmarked

t prodtothereceptaclecontactfingermarked

showaverylowresistancereading(not over

.Continuetotestall correspondinglynum-

ctfingersinthesame manner.Anopencir-

eindicatedby averyhighor infinite

ormoreconductorsarefoundopen,test for

dcircuitwillbeindicatedbya continuity

orswhicharenotcorrespondinglynumbered.

cuits,orhighresistance(over2ohms)circuit

before thecablecanbeplacedinservice.

rcuitsarefound,testeachcableforinsu-'

econductors(noshortcircuits).Usethe

0-1,000)ohmsetting;atthissettingthe meter

hort circuit.Testfromeitherendofthe

makecertainthattheotherendof thecable

hconductorsystematicallyagainstevery

circuitis foundbetweenanyconductors,the

r.42).

f theforegoingtestsisincreasedcon-

xedprogressivelythroughoutitsentirelength

ermittentcablefaultsthatmightotherwise

ositivelylocatedbythisprocedure.

sin plugsandreceptacles.

ndreceptaclecovers.

receptacleproperlyengagesitsmating

chcableinthereceptacleontheotherend

togetherwith thenutofthe plugtosee

y.

UTHANDELEVATIONINDICATOR.

s.14 and15)onthe rightandleftsides

osesthetwoslotted flexibleadjustingshafts

entoftheelectricalindexes.Usingascrew-

ofturnsofeachshaft inbothdirectionsto

systemisknownto beinadjustment,take


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umberofturns tothestop,so thattheshaft

naladjustmentsettingoncompletionofthe

keaboutseventurnsbetweenstops,and

hroughoutitsrange.Thecorrectadjustment

matelymidwayintherange.Roughmotion

stingwormorflexibleshaft,probablycaused

sttheactionof thestop.Ifthe motionis

urnsit isdueto improperfunctioningof

screwsthreadedintotheadjustingworm

epairas thereisapossibilityof tearingthe

ftsideof theindicatorandturnthe

oughseveralrevolutions.CAUTION:Ifthe

djustment,notethecoarseandfinescale

etest,andreturnthe adjustmenttothese

test.Donotelevateor traversethegun

hould turnsmoothlywithnoloosenessor

ical(outer)indexesshouldfollowtheknob

shbyrockingtheknobgentlybackandforth

otion;backlashatthispointmust notexceed

eadjustingknob.If backlashisinexcessof

rrected(par.51 g.(4)).Turntheadjusting

finemechanicalindexestotheirzeroposi-

exes.shouldread zerosimultaneously.Note

ndexestobind againstthescaleorinner

ionsshouldbeclearlylegible.If possible,

eself-luminousmarkings.Thiscanbeper-

ngatthe indicatorfaceunderadarkcloth.

nductedwiththesystemconnectedand

TM9-370(90-mm.antiaircraftgunmateriel,

uredescribedbelowisto berepeatedfor

atatransmissionchannels(fineazimuth,

tion,coarseelevation,andfuze),usingtest

ngthedirectorthroughseveralof theauthor-

eelectrical(inner)index onthesyn-

ldduplicateanysettingofthe corresponding

Ifthere isaconstanterror,adjustthe re-


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TEMM6

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ttedshafttomakecertainthattheoperating

mentrange.

eelectricalindexto oscillateaboutits

ightoscillationispermissible,butalarge

veralsecondsindicatesadefectivedamping

peaterwitha defectivedampingdevicewill

naway."Sucha repeaterisunserviceable,

51).

stnottouch01 dragagainstthemechanical

ereisanydoubt,removethewindowover

byturning thedialgentlywiththe finger

owerforthistest.

ethrough360degrees,while watching

ringorreversaloftheindex positionprob-

contactinthecontactringassembly.

emustberepairedoradjustedto render

snotedandactiontobetakenmustbe entered

eachsystem.Theactionto betakenwill

esavailable.Ifthe facilitiesofthesection

accomplishmentoftherepairoradjustment,

nentswillbepassedontoa highermaintenance

msshouldthenbeissuedtotheusing arm.

dbythecompletionofthebasicinspec-

nedtobe inserviceablecondition.Ifminor

correctedarefound,thenecessaryrepairs

stemtherebyplacedin serviceablecondition.

end themselvestosimplerepair,asthey

eforethenecessaryrepaircanbe accom-

und,further inspectionwillbenecessary

nprocedureindetail,anddeterminethespecific

acethesysteminserviceablecondition.Pro-

tionandcorrectionisdescribedinSectionVI,

fieldare,of necessity,themostrapidand

ablethatwillrestorethesystemtoan operable

maybe necessarytousespareconductors

gethewiringfrom thatinthe'standard

obe necessarytodisturbthestandardized


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t(par.34)ofthesynchronousrepeaters.

sarepermissible,butmustbeconsideredas

.Athoroughrecheckofconnectionsandad-

rdizedconditionsmustbemadeassoon as

doso.


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AR

ection33

gelectricalzero34

peatersremaininoperativeor fall

operation35

peatersrotatein oppositedirection

mitter36

peaterslag behindthetransmitter

on37

sto cometorest,butoscillatesabout

8

mainsstationaryfora time,thensud-

andagainremainsstationary39

tsincontactring40

of illuminationintwoormoreunits 41

LEDINSPECTION.

aseoftheinspectionaregenerallythe

the basicinspection.

ignedforthis datatransmissionsystem

eshopsandarsenals.Thetestinginstrument

ectorbecauseitcontainsfivesynchronous

atethesametypeoffiringdata asthatwhich

ttotheguns. Thesynchronoustransmitters

rewired andadjustedinaccordancewith

dthereforeshowcorrectoperationofthe

hetestinginstrumentisnotfurnishedforfield

operationare thereforenotincludedherein.

InstructionGuide,TestingInstrumentfor

dicatorsofDataTransmissionSystems,M4,

ms,MlandM2,November15,1941) for

ctionswhenusingthisinstrument.

TERMININGELECTRICALZERO.

erchangeabilitybetweensynchronous

mittersandrepeatersarecommonlysetto a


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ositionknownas"electricalzero."Thisposition

nastheposition whichtheunitwillassume

ctionsaremadetoacertainstandardized

ngset toreadzeroonits scale(fig.53).

enstandardizedonelectricalzerowillread

justmentwhenconnectedina normaldata

dthatanelectricalzerosettingisnot

peration.Theonlyessentialrequirementis

ame asitscorrespondingtransmitter.Ifthe

tmade,the featureofinterchangeability

st.

calzeroofa synchronousunitproceed

oftheunit marked1,3,and5(odd-

e 115volts,alternating-currentpowerline,

d4 (even-numbered)totheotherside.

nergized,therotor, ifunrestrained,will

verycloseto thatdennedasthezero posi-

adegree).

urbingtheconnections,breakthecon-

rked2,leavingit open.Withthepower

r,ifunrestrained,willassumeeitherthe exact

aposition180 degreestherefrom.The

stinguishbetweenthesetwopositions.

andardizediftheelectricalindexreads

(or canbebroughttozero readingbythe

haft)whentherotoris intheexactelectrical

izingadjustment,turntheslotted ad-

f itstravel.Adjusttheelectricalindexto

scalewhentherotorisi ntheexactelectrical

adjustmentbytemporarilylooseningthe

theindexontherotor shaftandturningthe

thattherotoris notdisplacedfromits

ctionalforces.

erterminals4and5must notbeinter-

.Thatis, theterminalmarked4onthe

nalmarked4onthe repeatermustbecon-

thepowersupply.Reversalofterminals

d180degreesoutof agreement.


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TEMMA

nMountMl)

ElectricalZeroSeting

kingoftheterminalsofaunit, therotation

otation,correctbyreversingtheconnections

3. Reversalofanyotherterminalswill

0degreesoutofagreement.(Itwouldbe

ecorrectlymarkedbeforebeingissued.)

RMOREREPEATERSREMAININ-

OFSYNCHRONISMDURING

dicatesanopencircuitor shortcircuit

,repeaters,orconnectingcable.Itmayalso

onin azimuthduetoafaultycontactring.

haracteraresometimesdifficulttolocate

istently.Therefore,whenanintermittentfault

utdisappearsbeforebeingcorrected,acom

nceshouldbemadebyusing personnelto

eshould itrecurlater.

minewhetherthetroubleis duetoa

anindexbindingatsomepoint. Seepara

mechanicalfaultshouldbe definitelyelimi

withtheelectricaltests.

oceedtolocatetheparticularunitat

onof thecircuitinwhichthefault occurs.

arepeater,allotherrepeatersconnected

somewhat,butthefaultyrepeaterwillusually

ffect.Whenthefaultyrepeaterisdisconnected,

off powerwhiledisconnecting)atthere

onbox,or(forfuzeindicatorsonly)gun

nt,thebalanceofthesystemwillfunction


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ptis notsuccessfulinlocatingthefaulty

aprocessofelimination.

transmitter,allrepeaterswillbeaffected

etoeliminatethefaultby disconnecting

typemaybe.foundin eithertransmitter

nsistofa defectinabrush,brushrigging, or

circuitinterruptionataspecificangular

maybeineither thefieldorarmaturede

rer'spractice.Thelocationmaybefound

erorvoltmeter-andammeter.Inanycase,

edwithinaunit,theunit mustbereplaced

ceable.Noattemptshouldordinarilybe made

eror repeater.

madewiththeunitdisconnectedfrom

eaters,attheappropriateplug.Powermust

notremovedbytheabovedisconnection.

obe connectedtoanyconvenientplugor

hareconnectedtotheunit(refertowiring

successivelytheresistancebetweenterminals

reerotationineachdirection.Opencircuits

edbya sharpswingofthemeterneedle.

hatthefield (4-5)terminalsbeenergized

s,60cycles,withotherterminalsdiscon

medbydisconnectingattheappropriateplug

singleadstopointsconnectedtotheabove

uslytoavoidshortcircuits).Connectthe

successivelytoterminals1-2,2-3,and1-3,

hevoltagevariationovera 360degreerota

voltageshouldrise andfallsmoothlyfrom

it isrotated.Asuddenvoltageinterruption

dicatesa defectiveunit.

d armaturecurrentsmayalsobemade.

ersare measuredunderthesameconditions

cingtheammeterinserieswiththe power

saremeasuredwiththesystemcompletely

ng.Thevalueofthearmaturecurrentat the

uldbeveryclosetozero.High currentindi

rcuit,anopenfield circuitoranincreasein

emechanicalfaultssubsequentlydescribed.

ntsinexcessof0.3amperemayresultin

catethatpowershouldberemoveduntil

ectedorthefaultremedied.


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andresistancereadingsfortheforegoing

esereadingsmay,however,varyconsiderably

5volts

)approximate..7ohms16ohms

mate0.9amp0.4amp

3):

105volts105volts

,2-3,'or3-1)

ms

undintheindividualunits itwillbe

cebackthroughallcircuitconnections,check-

ndcontinuityofconductors.Refertowiring

RMOREREPEATERSROTATEIN

MTHECONNECTEDTRANS-

a repeatermaybereversedbyinter-

matureconnections(1,2,and3). Ifthe

scorrect,itmayberetainedby confiningthe

marked1and3on therepeater.Theother

atetheelectricalzeropositionbyplusor

hangemaybemadeanywhereinthe wiring

ndtherepeater.Inthe caseoftransmitters,

ters,reversalatthetransmitterterminals

will reverseallfourrepeaters;reversalat

carriage)willreverseonlythe singlere-

fectingthedirectionsoftheothers.

RMOREREPEATERSLAGBEHIND

HERDIRECTIONOFROTATION.

excessivemechanicalload,orinsufficient

eamountof lagwillbefoundto varywith

andmaybecomezerowhenatrest.

rthevoltageat thegunindicators,or

maybeincorrect.Asystemvoltagebelow

over40voltsbetweentransmitterandre-


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AR

ocausethisdifficulty.Anopencircuitin the

ror repeaterwillalsocauseagreat reduction

nassumingeitherof twopositions180de

ity.

alloadsuchasatightbearingor binding

ion.Theoverloadinthis caseismore

hatdescribedabove,butasimilar procedure

ationandremedy.

ssibleindexes,asimpleandofteneffective

xasmallamount(say1 degree)firstinone

If theindicationreturnedtoinboth cases

aldifficultyoradeficiencyoftorqueis

EATERFAILSTOCOMETOREST,

TSSYNCHRONOUSPOSITION.

fectivedampingmechanisminthere

ple repeaters,allrepeaterswillusuallybe

hedefectiverepeaterwillusually'oscillate

misbuiltinto therepeater,anditsrepair

Thedampingmechanismisdesignedtobring

180degreesdisplacementwithinthreeseconds.

rge,itmaybe possibletoretaintheunit

erageratherthantheinstantaneousmotion

rdrive.Whentheoscillationistoolarge for

withtheuseofother connectedrepeaters,

ectedasunserviceable.Ineithercasethis fault

erepeater.

efectivedampingdevice,therepeater

nd,ifit startstorunas amotor,powermust

ematonce.

EATERREMAINSSTATIONARYFOR

OTATES180DEGREESAND

ARY.

catesanintermittentshortcircuitbetween

s andwillbeaccompaniedbyanabnormally

rpositions.Powermustbe removedfrom

henthisfaultisnoticed,as excessivearma

windingsmaybe burnedout.Thiscondition


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TEMM6

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eactingtorqueonthe transmitterwhich

catemechanismsconnectedthereto.Pro-

rcuitsinarmatureleadsis giveninpara-

CATINGFAULTSINCONTACTRING.

ssemblyismountedon theguncarriage,

edureistodisconnecttheplugconnectionon

st betweenthisplugandthereceptaclein

box.Thetestisconductedinexactlythesame

g(par.29). Tocompletelytestthecontact

ytotraversethe guncarriagethrougha

geachconductorforcontinuity.

in thismanner,theconductorspass

swell asthroughthecontactring.Hence,

dcircuitsarefound,checktheconnections

proceedingwiththe moredifficultoperation

actring.Anopenorshort circuitthrougha

anbe takenasapositiveindicationofa

Ashort circuitoffairlyhighresistance(a

andohms)generallyindicatesexcessive

ghousing.

arecorrectedbydisassemblingtheunit

eaningtheinteriorsurfaces.Removecorro-

actring surfaceswithSOLVENT,dry-clean-

elightlywith CLOTH,crocus,orPAPER,

merypaperoremeryclothon thecontact

EISFAILUREOFILLUMINATIONIN

eofilluminationfailureisburned out

sremedyistoreplacethelamps.If, how-

branchofthewiringremaindark afterre-

g(terminalsLjandLL,)inthat branchfor

inationwillprobablybedue toade-

tswitchinthegun junctionbox.Verifyby

sterminalsL(andL.,in thegunjunction

eadingis6 voltsorslightlymore.If there

erminalswith thesystemenergized,checkthe


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AR

ormerprimaryconnections(terminals4and

nectedintheprimarycircuitofthetrans

eis detectedandlocated,thecablemust

erformsheathrepairsandother cablerepairs

ecablerepair kit(par.17).

blecableandthearrangementis,orcan

cablesfurnishedarenotinuse, substitute

yonewhilemakingthe repair.Allportable

terchangeable.

uentlyberepairedbysubstitutinga spare

hefaultyconductor.Ifthe faultisashort

reconductors,oneconductormayremain

erofthe shortedconductorsmustbediscon

dup(userubbertape only)atbothends.

nishedhasoneidle conductortapedupfor

,theconductorsconnectedtoterminals4

ugsand receptaclesareconnectedexternally

neoftheseconductorsmaythereforebe

neoftheotherconductorsdevelopingan

sareavailable,itmaybe necessaryto

ductorandsubstituteanexternalwire,im

Ordinarily,No.14rubberinsulatedwire,

wiring,maybeemployedsatisfactorily.Since

rminalstripconnectedcannotthenbeclosed

utionsmustbetakento prevententranceof

othercovering,

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TEMM6

nMountMl)

MBLY

andassembly44

5

eceptacles46

oxes47

contactringfromgunmount49

g50

ndelevationindicatorM451

semblyproceduresdescribedhereinare

cemaintenancepersonnel.

emshouldalwaysbekept totheminimum

ecessaryrepairsor adjustmentstobe

semblyisdeterminedbytherepairman

dinspection.

hereverseofdisassembly.Thevarious

tbeassembled,andthenthesubassemblies

esystem.Wheretheassemblyoperationsvary

ocedureofthosefordisassembly,adescrip-

f assemblyisincludedinthismanual.

entinmarkingortaggingpartsas they

evaluabletimewhichwouldotherwisebelost

ng reassembly.Handleallpartscarefully.

SEMBLYANDASSEMBLY.

heseareinthe instrumentrepairkit

emaintenancecompanies.)

tainersof sufficientsizetoholdsmall

bled.

.

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MBLY

LDERING.

apethesurfacestobe soldered.Copper

henproperlycleaned.

pasteform,orinthe self-containedcore

sarefurnished.Whenusing paste,daba

asteon thecleanedsurfaces.Fluxinself-

specialapplication,asitwillflow properly

applied.

aroundtheterminaldeviceorother

t amechanicallysolidjointbeforesoldering.

edaroundcontactfingersorterminalsin

tmustbestrippedbackaboutVi-inchand

e.Rememberthatthe solderisintended

calcontact,andisnotintendedto with-

ointofa hotsolderingiron,andflow

ejoint. Removethesolderingironand

oodjointshouldshowathin continuous

psorexcessofsolder.Iftoo muchsolder

hejointwith thesolderingironandallow

iron.

dpartsapplya hotsolderingirontothe

,thenpullthepartsawayfromeachother.

ofpartsto preventcharringtheadjoining

ronis attheproperworkingtemperature

nned,notmorethanafew secondswillbe

olderingoperation.Anironthat istoocold

s,andrequireprolongeduseofthe ironin

ts. Anironwithapitted orimproperly

faults areacceleratedbyoverheatingofthe

e,andwillalsoprolongthe operation.

GSANDRECEPTACLES.

ptaclesusedthroughoutthedatatrans-

either oneoftwosimilarbasicpatterns,

ntactfingersandtheotheremployingspring

eceptaclesusedontheportablecablesare

hesepatterns.Thedisassemblyandassembly

sandreceptaclesmay,ingeneral,befollowed

ceptaclesinthesystem.

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MBLY

mblyofPlugAssembly(fig.54).

exposethespringterminalopenings.

ewdriver,pryoneend ofthesplitre-

ygroove.Continueworkingfromthisend

forremovalfromthe groove.

gringhasbeenremoved,theinsulation,

hespring terminalinsulatingplatecanbe

wn.

ytoincreasetheslackinthewires to

nthefoll&werandpush thecablethroughthe

rnquitehard whenbeingloosened,because

ndagainstthe grooveinthefollowerand

nagainstloosening.

minal,unsoldertheoldterminaland

ace.Seeinstructionsforsoldering,paragraph

refromwhicha terminalhasbeenunsoldered

olefromwhichitwasremoved.Seefigure46

ycolorcoding.

,slip eachspringterminalintoitshole

etheinsulationoverthegroup orterminals,

slotsinthe plateandinsulationinline with

ctgroupintothe plugbody.Thelocating

sedkeyinthe body.Workthesplitretaining

thebody.Tightenthefollower.

yandassemblyoperations,involvingre-

ure 54maybeperformedifrequired.

mblyofReceptacle,Assembly(fig.55).

overtoexposethecontactfingers.

verorsimilartool,freeanedge ofthe

ncarefullypullthe gasketclearofthecontact

ewdriver,pryoneend ofthesplit

odygroove.Continueworkingfromthisend

forremovalfromthe groove.

gringhasbeenremoved,theretaining

andtheinsulatingplatecanbe liftedout

ytoincreasetheslackinthewires to

nthefollowerandpushthe cablethrough

llturnquite hardwhenbeingloosened,

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MBLY

willexpandagainstthe grooveinthe

erablefrictionagainstloosening.

ger,unsolderthe oldcontactfingerand

.Seeinstructionsforsoldering,paragraph45.

omwhicha contactfingerhasbeenun-

same holefromwhichitwasremoved.See

ofwiresby colorcoding.

ptacle,slipeachcontactfingerintothe

and thenplacetheretainingplateoverthe

eepingtheedgelocatingslotsin theplates

thiscompactgroupintothereceptacle

eup withthepressedkeyinthe body.Work

ckintoitsgrooveinthe body.Fitthesoft

tactfingerssothat thenumberedholesin

umberedholesin theretainingplate.Seat

ts groove.Tightenthefollower.

yandassemblyoperations,involvingre-

ure 55maybeperformedifrequired.

FROMBOXES.

sfromboxesorterminalstrips which

etime,it willoftenbefoundthatthe rubber

hecover.Tofacilitatebreakingthis bond,

opermitthe insertionofanarrowchiselor

erloose.Afterthecoverhas beenloosened,

ttoinsert thetooltoa pointwherethegaskets

stalsobe takennottonickthesealing sur-

nd thusimpairtheeffectivenessofthe

ersmustbeproperlyreplacedandtightened

mpness.

variouswiringboxesareconveniently

rminals.Terminalsandterminalplatesare

fication.Thewireconnectedtoeachterminal

fyingcolor.Refertofigures 46,47and48

orcoding.

EMOVINGCONTACTRINGFROM

gunmountabouttwofeetfromthe

Elevatethegun untiltheequilibratorparts

owworkingspace.


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gTerminalBoxWires

erminalBox


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xcoveranddisconnectthewireterminals

.56). Besurethateachwirecanbe properly

n.Ifmarkingsorcolorsdonotagree withthe

gs.46and47),tageachwire beforediscon

x(fig.57)

eceptacleretainerplateovertherecep

eptaclebox(fig.58).

ottomclosureplate.Tapealengthof

ble.Removethecontactringretainingscrews

ring tothefloor(fig.59).

actring,proceedinthereverseorder

l.

NTACTRING(fig.60)

segmentwiresleadingintothecontact

ox.Besurethat eachwirecanbeproperly

n.Ifmarkingsorcolorsdonotagree withthe


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TEMM6

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ontactRing

gs.46and47),tageachwire beforediscon-

ws(1,fig.60) intheedgegroovesofthe

spindleandbrushrigging assembly(2)out

workingparts willthenbeaccessiblefor

mbly.

brushrigging assembly(3),removethe

hesupportingchannelandprythechannel


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MBLY

ndfineindicatorswillbe requiredatthis

owever,forminordisassembly,itisadvisable

ymarkinga lightpencillineacrossthe

xmeetsthe adapter.

escaleand indexes,adjusttheouter

eroreading,asfollows:Turnthedrive shaft

arseindexstandsatthezero graduationof

escrewswhichhavebeentemporarilyplaced

dex,andrefastenthisindexinthe position

ssembly(figs.67to72).

crewsintheedge ofthecover(fig.67).

helampshieldandlamp(fig.66). Thelamp

ge withoutfurtherdisassemblyofthe

ASSEMBLY.

dterminalscrews(fig.69)so astofree

ssembly.Removethecotterpin(fig.70)

n

EMBLY.

ockassemblyisseldomrequired.For

fpartsrefertofigures 71and72.

tingKnobCoverAssembly(figs.73

tounlatchthecover,thenraisethecover

retainingspring (fig.73).Removethe

.Thelampsmaybereplacedat thisstage

blyoftheindicator.

ASSEMBLY.

erretainingscrew(fig.74)and pullthe

heindicator.

rtsis seldomrequired.Forremovalor

rtsrefertofigure75.

thRepeatersAssembly(figs.76to80).

kwasherin thefineindexadapter(fig.

asheroutofitsgroovein therepeatershaft

lkeywhichfits intothekeywayinthe


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inebetweenthegearandthehub as-

hegear.

ustingshafts(fig.77).

alindexadjustingknobgroup(fig.78).

pitwill benecessarytoapplynewsealing

eoftheadapter.)

ormbracketassemblies(fig.78).Each

escrewsandlockwashers,andlocatedby two

ngthesebracketsbesureto meshtheworm

aterwormgear,betweenthestopscrews.)

mbly(figs.78and86) leavingtheball

thehub. Thespecialtoolshowninfigure78

utis difficulttoremove.Thistoolisnot

trepairkit,but shouldbepreparedlocally.

wormbracket,assembly(fig.78).The

escrewsandlockwashers,andlocatedby two

sandlockwashers(fig.79) whichsecure

sassemblytotheindicatorcase.Pullthe

time,fromthepassageslotin thecase.

andpullit forward,outoftheindicator

omBracketwithRepeatersAssembly

tthepoints showninfigure81.These

terminingtheproperslackintherepeater

Todetermineproperslack,dressthewires

e repeater(fig.82)andturnthe repeater

motion.Itmaybe helpfultotemporarily

ormbracket.Thereshouldbejustenough

gmotionof therepeaterswithoutstrainor

adjustmentlimits).

bound withheavycottoncord(fig.82).

y,andthe wirespulledthroughthebracket

erscanberemoved.

ter,removetheclip(fig. 83)oneach

henpulltherepeateroutof tHebracket.

romBracketwithRepeatersAssembly.

,assembly(2,fig.84) andthenut(3)

movethekeyedwasher(4).Pullthegear


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shaft(ball bearingsneednotberemoved

ferentialspideron asolidsupportingblock

n(6)whichsecuresthespider (7)tothe

roup offtheendofthe driveshaft.Pull

he endofthedriveshaft.

differentialparts(fig.84) maybeper-

itbe necessarytodriveoutanyofthe

woodendriftand tapthebearingout

incleanwaxedpaperimmediatelyon

hedriveshaftparts,spotmark both

ocatethemaccuratelyforreassembly.

removetheretainingrings. Pushthedrive

of thebracket.Theouterbearingrace

mtheremainderofthe bearing,asthisis

etotypeballbearing.Pushtheouterrace

eassembleitwith theremainderofthe

sincleanwaxedpaper.

driveshaftand differentialparts,replace

rcase.Checkforbacklashinthe mechanical

ckingtheknobgentlybackand forthwhile

onary.Ifbacklashexceedsone-halftooth

nob,itmustbe removed.Totakeupback-

romthecaseandpush thedriveshaftforward

ontretainingring (fig.85)andtighteningthe

cklashiswithin thelimitsdescribedabove.

tsfromCoarseRepeaterwithGear

movalshowninfigure86.

rnalkeywhichfitsthekeywayinthe

sfromFineRepeaterwithGear

movalshowninfigure87.

antthatbothballbearingsinthe hub

ondition.Anyhighspotorbinding ineither

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nspots,aswell asunavoidableblemishes

ustingoperationsshouldbetouchedupwith

practicalcolormatchoftheoriginalfinish.

the azimuthandelevationindicatormay

ack(or white)paintonthefront(or rear)

emptshouldbemadetorepairtheluminous

slucentscalegraduations.Iftheindex mark-

lydamaged,replacetheentirepart.

aintedbeforeissueandfrom timetotime

onditionsandclimaticconditionstowhich

mustbe supervisedbysomeonefamiliar

nstruments.Careshouldbe exercisedthat

withscales,gearteeth,bearings,or locating

ntonbearingsandother finelyfinishedparts

must bedryandfreefromdirt, oil,grease,

SOLVENT,dry-cleaning,andrinsewithhot

m.Itmustberememberedthatfrequent

entsinthesamebatchofsolventwill soon

se,sinceiteasilybecomessaturatedwith

ventmust bechangedfrequently.Rough,

nishedshouldbefiled orgroundtoremove

ltin apoorfinish.

T.

oundmarredpartsbymeans ofPAPER,

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mesfromthe can.Allowtheremovertostay

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twitha brushorspraygun.Exercise

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ALCLIMATICCONDITIONS

sunderdesertconditions54

e55

URFACESUNDERDESERTCON-

hedglasssurfacesorfinishedmetalsur-

ovalofdustandsandto preventabrasion

tRequired.

with fairlystiffbristles.

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oth10inchessquare.

ing.

ebrush.

voidscratchingtheglass.

entlestrokesof thecamel'shairbrush.

singthe glasssurfaceswithwaterand

aningfluidtothe glasswiththecamel's

esecloth

OISTURE.

cedinsomeclimateswiththeaccumu-

ataindicators.Thefollowingprocedures,

rimentunderadverseclimaticconditions,have

edyingthiscondition:

partialoverhaulandcloseinspectionof

veaccumulatedmoisture,todetermineand

eaksinto theindicatorhousing.Toaccom-

questionshouldbeuncoupledfromtheir

dremovedtoadry roomwherethevarious

,andcoverplategaskets,etc.,maybein-


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yprocedurestakenforrestoringthemtoa

rect seepageintotheindicatorcases

ailproceduresforobtainingwatertighthous-

nedbytheactualconditionsencountered

rexample,thesmallmachinescrewsused

ave,in somecases,permittedseepage.On

er,thesescrewholesarenotsupposedto go

nd,if properlymachined,willcauseno

ppedthrough,thescrewsshouldbeslushed

omakethemwatertight.Theextraboss for

onductorconduitshouldbecheckedforser-

dertheclosureplug,and thepackinggland

hould bebackedoutandtheconepacking

oesnotcompletelysealthecircumference

edrive shaftoilsealshouldbe examined

placedif necessary.

rsandother internalpartsfromthe

eattemptedunlessabsolutelynecessary,and

ersonnel.Evidencesofsurfacemoistureon

movedbylight swabbingwithdrycloths,

bjectedtoa flowofdry,hotair forathorough

ngthevariouscovers,etc.Thereconditioned

atorsshouldthenbelubricated,reassembled

ctivegunmounts.

nsthepreservationoftheabovedry con-

plishedoveraperiodof oneyearfromthe

bjectingtheindicatorstoaperiodicalwarm-

re operatedonehouraWeek.Thispractice

cordancewithclimaticconditionsoractivity

uldbestrictlyobservedduringrainyseasons

materiel.

heaboveprocedureswillmaintainthe

onditionforatleastoneyear.It is,therefore,

endofeachyearthe indicatorsbesubjected

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sts56

57

LATURELISTS.

n,M6(for90-mmA.A.

mmA.A.gunmount,

211

Ml(Keuffeland Esserand

M2(BauschandLomb). .SNLF-189

167

F-5

F-227

nt,gun,antiaircraft,90-

andequipmentSNLD-28

SNLF-202

3SNL F-200

uipmentSNLF-206

r,Ml bodypartsand

ubricationmaterials,recoil

aritemsof issueSNLK-l

clatureListsareastabulated

NL'sis maintainedasthe

SupplyIndex"OPSI

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icatingandweldingmaterials

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0-mmgun,Mlandmounts,

ppercarriageTM9-1370A

0-mmgun,Mlandmounts,

ageTM9-1370B

ze,setter,M13(previously

eightfinder,MlTM9-1623

eightfinder,M2TM9-1624

nualDirector,M7 for

mmA.A.gunmaterielTM9-1658

atingunit,M5andM6....TM 9-616

eneratingunit,MSTM9-1616

umentrepairmanTM9-2602

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NS

owareincludedasa supplementtothose

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TARYOFWAR:

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Documents

Tm 9-1653 Data Transmission System m6, 1942