Film-Tech

The information contained in this Adobe Acr obat pdf

fil e is provided at your own risk and goodjudgment.

These manual saredesigned tofacil itatethe

exchangeof information related to cinema

projection and fil mhandl ing,with no warranties nor

obi igationsfromtheauthors,for qual ified fiel d

service engineers.

If you arenot a qual ified technician,p| ease make no

adj uatments to anything you may read about in these

Adobe manual downloads

www.fi| m-tech.c0m

L E S S D N N O. SP-3

PRINTED IN U-S-A.

INSTALLATION AND OPERATION OF PROIECTION EQUIPMENT

IN ORDER TO FAMILIARIZE

YOU HITH THE EQUIPMENT USED IN THEATERS FOR

THE PRESENTATION OF SOUND PICTURES, HE SHALL TREAT THIS SUBJECT FROM THE

STANDPOINT OF INSTALLATION-

PROBLEMS WHICH ARISE AT TH

THEATER WHICH HAS ORIGINALLY

DESIGNED FORTHE PRESENTATION

OF SILENT PICTURES ONLY» IN

THIS HAY; YOU WILL BECOME

ACQUAINTED WITH EACH UNIT OF

THE EQUIPMENT AS REGARDS IN-

STALLATION; OPERATION; AND

GENERAL MAINTENANCE.

IT |s ALSO HELL TO

MENTION AT runs TIME THAT

souuo PICTURES ARE NOT ONLY

a:|~e ussn m THEATERS ALONE,

BUT EDUCATIONAL INSTITUTIONS

ARE ALSO wow UTILIZING sucu

zounpnsur AS A MEANS ron

IMPARTING INSTRUCTION T0

THEIR sTu0£NTs.

BOTH LARGE AND SMALL

SCHOOLS ARE AT PRESENT

SHOWING EDUCATIONAL Plcvunag

warn SPEECH ACCOMPANIMENT.

Mernous As THIS OFFER A

coon MEANS or DEMONSTRAT-

' THIS CAN BEST BE DONE BY DISCUSSING THE

E TIME OF INSTALLING SOUND EQUIPMENT IN A

Fla. I

STUDENTS INSPECTING Souuo P|c'rum~: Scnssu

"AGE 2 souno RILIHRES

ING THE ACTIVITY IN THE VARIOUS WALKS OF INDUSTRIAL AND COMMERCIAL LIFE,

SO THAT

STUDENTS ARE BROUGHT CLOSER |n CONTACT WITH THE PRACTICAL APPLI

CATION OF THE SUBJECTS ABOUT WHICH THEY ARE STUDYING-FOR EXAMPLE,CLA$g:

Es |~ CHEMISTRY CAN THUS w|TnEsE,AHIEREET4us~ExEEnTHEwTs1As CARRIED ouT

IN s ' ' ‘

one LARGE LABORATORY, STUDENTS OF ENGINEERING CAN BE suown How GREAT

FACTORIES PRODUCE CERTAIN ARTICLES ETc.

SO CONSIDERING PICTURE EQUIPMENT INSTALLATION FROM ALLANGLE$,|T |5

EVIDENT THAT THERE IS A GREATER DEMAND FOR COMPETENT MEN THAT ONE WOULD

AT FIRST SUPPOSE- THIS TYPE OF WORK IS FASCINATING, WELL PAID FOR, AND

OFFERS ANOTHER PROFITABLE ouTLET FOR THE WELL TRAINED RADIO STUDENT.

CONSIDERATION OF AUDITORIUM ACOUSTICS

BEFORE COMMENCING THE ACTUAL INSTALLATION WORK,IT IS ADVISABLE TO

wonos, THE ACOUSTIC CHARACTERISTICS OF THE ROOM MUST ac CAREFULLY STUD-

IED nu THE MANNER AS ALREADY DESCRIBED IN ONE or YOUR PREVIOUS Lsssous,

WHERE WE DISCUSSED THE INSTALLATION OF souuo AMPLIFIERS |~ AUDITORIUMS.

ExcEss|vE REVERBERAT|ON,AND CONSTRUCTIONAL DETAILS CAUSING HoLLow

ECHOING sounos MUST BE ELIMINATEO EITHER BY ALTERATION OF THE ROOM on

ELSE THROUGH THE PROPER usE or WALL DRAPERIES, HEAw CARPETS ETc. QNE

SHOULD ALso sEE To IT THAT OUTSIDE NOISES oo NOT HAVE ACCESS INTO THE

AUDITORIUM.

CONSIDERING THE CONSTRUCTION OF THE PROJECTION BOOTH

ANOTHER POINT To CONSIDER WITH THE UTMOST CARE, BEFORE INSTALLING

LESSON no 3 PAGE 3

souuo PICTURE EQUIPMENT,lS THE PRo.::cnou_sooT|~r lTSELF- A5 WAS MENTIONED

BEFORE, Two PICTURE PROJEcTORS AR: REQUIRED T0 snow A CONTINUOUS PICTURE

wnuour nurcnnuwruou azrwczu REEL$- THE PROJECTION BOOTH SHOULD mane-

FORE as LAID our so THAT ADEQUATE SPACE ‘ii -N

|s ALLOTED row "rue INSTALLATION or THESE ‘ '

PRO-JECTORS,WlTHOUT HAVING TO PLACE man

so moss roosrnsn run 1'14: 0;-canon ms

TO worm m CRAMPED QUARTERS.

Nor ONLY MUST THE PROJECTORS THEM-

SELVES as HOUSED m 1':-us soon-4 aur ALL

OF THE AcczssoR|Es,sucH As TURN TABLES

FOR ousc RECORDING-S,SPOT LIGHTS, AMPLI-

FIER CONTROLS arc. MUST ALso as INCLUDED

IN THE BOOTH. Ir IS asst TO spam: surng

IENT nm-: m n-cc PLANNING or 1'2-as soon:

azroasnmo, rum TO HAVE to MAKE ALTERA-

nons AFTER rm»: EQUIPMENT rs ALREADY m-

STALLED AND ALTHOUGH "rue EQUIPMENT snouw

NOT ALL as cnowoso TOGETHER,YET |'r snouua

nor as SEPARATED T0 we POINT wnzns THE 1

OPERATOR LOOSES VALUABLE TIME m movme FIC-i,'5

rnom om: uruv TO ANOTHER A Turntable Park.

A NEAT ARRANGEMENT or TWO PROJECTORS wnn THEIR TURN—TABLES I5 SHOWN

m F|e.2 AND HERE ‘rm: FADER AND AUXILIARY moan ARE aoru MOUNTED on ms

wALL m FRONT or THE PROJECYORS, so run ms OPERATOR CAN COMFORTABLY RE

GULATE THE moms or "rm-: AMPLIFIER EQUlPMENT_FROM znuza or THE TWO PIC-

TURE PROJECTORS- ALso NOTICE ms VENTILATION uucrs Aaov: rm: LAMPHOUSE or

EACH OF THE PROJECTORS- Tues: nusr uzvzn as omnzo wuzu A CARBON ARC |s

uszo ron 'r|-as ILLUMINATION or" n-as PROJECTOR.

IE PLENTY or SPACE IS AvA|LAaL:,TnEN IT IS IDEAL TO PLAN ON PLACING

THE AMPLIFIER AND wrs Assoc|AT:o souuo EQUIPMENT |u A SEPARATE ROOM-THIS

ADDITIONAL ROOM uzzo not as LARGE BUT ONLY or SUFFICIENT SIZE TO conven-

IENTLY nous: rue ACCESSORY APPARArus. Bv rnus MEANS,MORE OPERATING sPAcE

w|LL as PROVIDED nu THE PROJECTION aoorn AND ONLY THE PROJECTORS, TURN-

TAsLEs,sPoT LIGHTS, sounu

Elfitggk WW1!“ ""°i“‘7°"‘  CONTROLS AND EQUIPMENT or

J 'E°°"" ' nus NATURE NEED as ms1'A-

II ,_ Y‘- LLED m THE BOOTH-IN omen

ksflh  _ vonos,'rn: acorn wouLo now

" . K ONLY CONTAIN THAT scum-

“ - I MENT wmcn nus? AT ALL T|—

"P"?   MES as AT ms FINGER TIPS

- E  HOIIM or THE owcmron DURING THE

°‘;'.;:" PERFORMANCE.

mam-csLL Mum“; _/ .

3 - "°“   . 7 _ ~_msc£LLAu£ous*£ou|PM:.~n

S-did: V I It IS NOT ALHAY5 M55

|=|@_4 ESSARY TO PURCHASE MOTION

Lag-aué of F‘7>—=>_;'¢c¢f=/-I Equ/;¢m¢,1g~_ PICTURE PROJECTION EQUIP-

1'

r

"\TURN YABLE

orfi

\

~ Os.

I

<.§Y'~ \\»\Y§\‘§\\\\‘\\‘.=5<\\ ‘~?E§~. \. \_\

— Aum 70k! (/M —

QQQKEN

L1

r F‘ O H N 5

)

PAGE A souun PICTURES

MENT BECAUSE COMPANIES NOW MAKE A PRACTICE or LEASING THIS EQUIPMENT TO

THEATERS arc. In runs CASE, THE THEATER owncn PAYS ron THEINITIAL cosr

or THE INSTALLATION AND FOR THE RENTAL,AND ssnvncz cnaaess. Tn|s PRAC-

TICE IS FOLLOWED ESPECIALLY wnsns vsnv HIGH PRlCED.EQUlPMENT |s'~ BEING

uszn.

VERY orrzu, IT rs DESIRABLE ro HAVE NON—SYNCHRONOUS MUSICAL ACCOM-

PANIED TO SILENT PICTURES on DURING INTERMISSIONS IN THE PROGRAM zrc.

Fon rues: OCCASSIONS, A TURN—TABLE, sucu AS snown IN F|e.},w|LL PROVE OF

GREAT VALUE. HERE YOU WILL sea now THREE INDIVIDUAL TURN—TABLES ARE

M?"vT£o on A RACK, EACH or THEM BEING PROVIDED wsrn A PICK-UP UNIT. A

"cons:-Necx" LAMP ILLUMINATES THE UNIT»

IN THIS WAY, CONVENTIONAL PHONOGRAPH RECORDS CAN BE PLAYED AND THE

ENDING OF ONE CAN BE NOVEN RIGHT INTO THE BEGINNING OF THE OTHER THRU

THE PROPER OPERATION OF THE FADER-

AT THE PRESENT TIME, IT IS ALSO ADVISABLE TO INSTALL EQUIPMENTL

WHICH CAN BE USED FOR THE SHOWING OF TALKING PICTURES WITH DISC RECORD-

ING, AS WELL AS WITH FILM RECORDING BECAUSE BOTH OF THESE METHODS ARE

BEING USED BY PROMINENT MOTION PICTURE PRODUCING COMPANIES.

LAYING OUT THE PROJECTION BOOTH

THE PROJECTION BOOTH SHOULD BE WELL VENTILATED AND SUITABLY ILLUM-

INATED FOR THE CONVENIENCE AND*HEALTH OF THE OPERATOR BECAUSE CONSIDER-

ABLE HEAT IS GENERATED BY THE EQUIPMENT WHEN IN OPERATION AND HARDLY

ANYTHING IS MORE NERVE-RACKING THAN TRYING TO READ SOME NOTATION OR MAKE

AN ADJUSTMENT WHEN SURROUNDED BY DARKNESS-

SINCE CONSIDERABLE POWER WIRING IS INVOLVED IN THE INSTALLATION OF

LESSON NO 3 PAGE 5

TALKING PICTURE EQUIPMENT, CERTAIN CITY on COUNTY LAWS AND SPECIFICAT-

IONS MUST as FULFILLEDWITH RESPECT TO THE WIRING eTc. TuIs Is NATURALLY

DUE TO Tue FIRE-HAZARD or sucu EQUIPMENT AND so aeFORe PROGRESSING WITH

THE WORK, IT Is ADVISABLE To FIRST CONSULT vouR LOCAL REGULATIONS RELA-

TIVE To THE INSTALLAT|ON- IN THE LARGER cITIes, FOR EXAMPLE, Tue LAW R5

QUIRES THAT ALL WIRING as CONCEALED WITHIN RIGID CONDUIT (Inou PIPE) OR

ELSE IN FLEXIBLE METAL TUBING. IT MIGHT ALso ae WELL To ADD ATTHIS TIME

TuAT No PROJECTION sooru SHOULD ee WITHOUT A coco FIRE EXTINGUISHER,

WHICH CAN as PUT INTO IMMEDIATE use, SHOULD AN EMERGENCY ARISE-

A GENERAL LAY-OUT OF THE SOUND PICTURE PROJECTION EQUIPMENT IS

SHOWN IN FlG-H- FOR THE SAKE OF CLEARNESS,WE ARE ILLUSTRATING THE PRO-

JECTION ROOM RATHER LARGE AS COMPARED TO THE AUDITORIUM BUT FOR THE PRE

SENT, THE SOUND EQUIPMENT ITSELF IS MORE IMPORTANT TO US THAN THE AUDI-

TORIUM-

NoTIce THAT THE PROJECTION ROOM IN THIS CASE MUST AccoMMoDATE THO

COMPLETE PROJECTOR UNITS, WHICH we ARE DESIGNATING As MACHINE #1 AND

MACHINE #2. EAcu or Tuese MACHINES HAS aoru A oIsc PICK-UP UNIT AND A

FILM PICK-UP UNIT- One SWITCH AT MACHINE #1 AND ANOTHER AY MACHINE #2

PERMIT EITHER OF THE souun PICK-UP UNITS T0 ae CONNECTED T0 ITS RESPEC-

TIve MACH|NE~ I

THE PICK—UPS FROM BOTH MACHINES FEED INTO THE SAME FADER AND BY

THROWING THE SWITCH OF THE SWITCH PANEL TOWARD THE LEFT,THE FADER BE-

COMES CONNECTED TO THE MAIN AMPLlFIER- THE SOUND CURRENTS CAN THEN BE

PASSED THROUGH THE OUTPUT CONTROL, MONITOR HORN AND TO THE MAIN SPEAKER

UNITS, WHICH ARE LOCATED ON THE STAGE BEHIND THE SCREEN. IN CASE THAT

NON-SYNCHRONOUS MUSIC IS DESIRED, THEN THE SWITCH ON THE SWITCH PANEL

CAN BE THROWN TOWARDS THE RIGHT AND THIS WILL CONNECT THE NON-SYNCHRON-

OUS TURN-TABLE TO THE AMPLIFYING SYSTEM-

lu FIs.5, YOU WILL see A uoae DETAILED SCHEMATIC DIAGRAM or THE

souuo EQUIPMENT eon A TWO—MACH|NE INSTALLATION. HERE Tue SYSTEM Is rug

NISHED WITH A 110 VOLT A.C. SUPPLY rnou THE LIGHTING LINES AND THE MAIN

AMPLIFIER Is counecven DIRECTLY To THIS A.C. LINE. IT Is OF counse un-

DERSTOOD TuAT Tue AMPLIFIER Is PROVIDED WITH ITS own POWER PACK, WHICF

couvenfs Tue A.C. INPUT INTO D.C. VOLTAGES AND A.C. VOLTAGES OF THE PR2

PER vALues, THE SAME AS IS none IN ANY AUDIO AMPLIFIER FOR PUBLIC ADD-

RESS WORK ETC.

SINCE STORAGE BATTERIES ARE USED FOR THE FILAMENT SUPPLY OF THE E5

CITER LAMP IN THE FILM PICK—UPAND FOR THE TUBE FILAMENTS OF THE PHOTO-

CELL AMPLIFIER, PROVISIONS MUST BE MADE SO THAT THESE BATTERIES CAN BE

KEPT IN A FULLY CHARGED COND|TION- FOR THIS REASON, A BATTERY CHARGING

CIRCUIT IS INCORPORATED IN THE HOOK-UP.

THE BATTERY CHARGER CAN BE OF THE CONVENTIONAL TUNGAR TYPE, BEING

CONNECTED TO THE A.C. LINE BY MEANS OF A SINGLE THROW, DOUBLE POLE SWI-

TCH- THE CHARGER IS IN TURN CONNECTED TO THE TWO 8 VOLT STORAGE BATTER-

IES BY MEANS OF A PAIR OF DOUBLE-POLE, DOUBLE THROW SW|TCHES~BY CLOSING

THESE LATTER TWO SWITCHES OF F|G~5 IN A DOWNWARD DIRECTION,THE CHARGER

IS CONNECTED TO THE BATTERIES AND BY CLOSING THESE SAME TWO SWITCHES IN

THE UPWARD DIRECTIONJTHE STORAGE BATTERIES ARE CONNECTED TO THE EXCITER

P*GE 6 souuo PICTURES

LAMP AND FILAMENT CIRCUITS OF THE PHOTO ~ CELLAMPLlFIER- WITH THESE SKI

TCHES IN THE OPEN POSITION, THE BATTERIES ARE DISCONNECTED FROM ALL OF

THE CIRCUITS.

‘ THE CHARGER IS NOT KEPT IN OPERATION DURING THE TIME A PICTURE IS

BEING SHOWN AND THE BATTERIES ARE PUT ON THE CHARGING CIRCUIT ONLY DUR-

ING THOSE PERIODS WHEN THE PROJECTION EQUIPMENT IS NOT IN USE-

FouR, sERIEs coNNEcTED, H5 voLT "B" aATTERIEs ARE USED To SUPPLY

THE ANODE POTENTIAL TO EACH or THE Two PHOTO-ELECTRIC cELLs AND To THE

RLATEs or THE RHoTo-cELL AMPLIFIER. IN PROJECTION WORK, THE FILM PICK-

DR, CONSISTING or THE EXCITER LAMP, =HoTo-cELL, AND THE PHOT0—CELL AHPLI

FIER Is GENERALLY REFERRED TO As THE "SOUND HEAD" or THE FRDJECTOR AND

WE HAvE NAMED THIS UNIT As SUCH IN FIs.5.

NoTIcE IN FIe.5 How THE "B" LEADs To THE HEAD AMPLIFIERS ARE EN-

CLOSED IN GREENFIELD ARMOR cAaLE AND THAT THE OUTPUT or THE DISC PICK-

uPs AND HEAD AMPLIFIERS ALL LEAD INTO A SINGLE FADER- THE AUXILIARY FA"

DER IS coNNEcTED To THE MAIN FADER av MEANS OF AN EXTENSION SHAFT AND

SUITABLE sEARs, so THAT EITHER CONTROL OPERATES THE SAME FADER.

THE TERMINALs ENCIRCLED AT "A" OF FIc.5 ARE THE AuDIo OUTPUT‘ TER-

HINALs LEADING To THE voIcE COILS or THE DYNAMIC SPEAKERS- THE .MONITOR

HoRN Is CONNECTED T0 THE TERMINALS AT "B" AND THE FIELDS or THE DYNAMIC

SPEAKERS ARE CONNECTED To THE TERMINALS ENcIRcLED AT "C". IN THIs NAT,

THE FIELD CURRENT T0 THE SPEAKERS wILL BE AN A.C.suPPLv BUT THIS Is REE

TIFIED AT THE LOCATIONOF THE SPEAKERS,SO THAT A DIRECT CURRENT WILL BE

FURNISHED TO THE FIELDS- THE INBuT’TERMINALs FROM THE FADER INTO THE AM

PLIFIER ARE MARKED "D" AND THE ToNE coNTRDL PERMITS THE OPERATOR To AD:

.

LESSON no. 3 PAGE 7

JUST THE TONE QUALITY, SO THAT THE MOST NATURAL TONE CAN BE PRODUCED.

THE VIRES LEADING FROM THE AMPLIFIER OUTPUT TO THE SPEAKERS SHOULD

BE RUN IN TWISTED PAIRS, CAREFULLY SHIELDED SO AS TO PREVENT PICK-UP OF

DISTURBING NDISES. THE SPEAKERS SHOULD BE MOUNTED IN BACK OF THE PIC-

TURE SCREEN IN SUCH POSITIONS AS WILL AFFORD THE BEST SOUND DISTRIB!

TION AND THE NUMBER OF SPEAKERS REQUIRED HILL OF COURSE DEPENO UPON THE

VOLUME AND SEATING CAPACITY OF THE AUDITORIUN.

MOUNTING THE SPEAKERS

THE GENERAL PRACTICE IS To FIRST MOUNT THE SPEAKERS on A TEMPORARY

SET UP, so THAT THEY CAN as SHIFTED ABOUT AND AIMED IN urrrznzur DIREC-

TIONS WHEN THE AMPLIFIER I5 IN OPERATION ounnue THE TesTs. HAVING THUS

DETERMINED THE BEST SPEAKER POSITIONS, THEY CAN as PERMANENTLY MOUNTED

AND IN on: or OUR LESSONS on souun AMPLIFIER EQUIPMENT, HE ALREADY cou-

SIDERED THE PROPER METHODS or SPEAK- H

an INSTALLATION FOR AUDITORIUM use.

Howzvsn, |u Fue. 6, we ARE SHOWING

YOU ANOTHER EXAMPLE or SPEAKER PLACE

MENT-

A vznv IMPORTANT Po|HT,wH|cH

SHOULD av no MEANS as OVERLOOKED, as

THE MATTER or SELECTING A scnssn

SUITABLE FOR souuo PICTURE PURPOSES.

TH: scnzzn SHOULD as "TRANSVOCENT",

THAT IS, SPECIALLY woven so THAT

souuu WAVES CAN PENETRATE THROUGH IT

WITH EASE.ORDINARY TYPES or scnszns,

As ussn FOR SILENT PICTURES, ARE Too

HEAVY AND CLOSELY woven ron FAITHFUL

souuo PROJECTION AND THEY HAVE A TEN , L#;?m£n”\u_ I _

ozucv To DEADEN on MUFFLE THE sounos, “‘ "~?“¢?¢¢;~~»‘

WHICH ARE EMITTED FROM THE SPEAKERS.

THE STAGE IN BACK OF THE SPEAK- ‘ F‘G.7 - -

ERS SHOULD ALSO BE ACOUSTICALLY A phO*O-Ca” Ampllflen _

TREATED SO THAT REVERBERATION IS KEPT DOIIIN TO A MINIMUM. IF THIS IS NOT

DONE, ANNOYING ECHOES WILL BE SET UP BACK-STAGE AND THUS PREVENT FAITH-

FUI. SOUND REPRODUCTION. THE REPRODUCED SOUNDS SHOULD BE SUCH THAT THEY

APPEAR JUST AS THOUGH THEY ORIGINATED ON THE SCREEN ITSELF AND A GOOD

DEAL OF PRACTICE IS REQUIRED TO ARRIVE AT SUCH A CONDITION IN A REASON-

ABLY SHORT TIME.

ONE STANDARD PRACTICE IS TO COVER THE HORNS, AND THE BACK OF THE

SCREEN, EXCEPT THE AREAS OCCUPIED BY THE HORNS, HITH ABSORBENT DRAPE5¢

CALIBRATING THE AMPLIFIER

AFTER THE INSTALLATION IS CDMPLETE,THE NEXT STEP as To "cAL|sRAT:"

THE AMPLlFIER,THAT IS TO SAY, IT IS NOV ADJUSTED TO GIVE THE BEST POS-

n

SIBLE RESULTS FOR THE PARTICULAR THEATER. THIS I5 DONE BY MEANS OF TEST

PAGE 8 souuo PICTURES

nEcoRns", aoTH or THE FILM AND ulsc TYPE. THESE 1557 RECORDS MAKE AyA|L

ABLE A WIDE VARIETY OF THE TYPES OF ENTERTAINMENTS TO BE GIVEN AND EACH

|s ALREADY MARKED WITH THE-FADER SETTING FOR THE EQUIPMENT BEING USED-

(TH|s us IN THE cAsE or STANDARD souuo EQUlPMENT,SUCH As WESTERN ELEc-

TRIC ETc.). THE FADER SETTING FOR TH|s APPARATUS HAs ALREADY BEEN oETE§

MINED IN A THEATER, WHICH HAs BEEN CHOSEN As A "sTAHoARo".

’ Bv PLAYING THEsE RECORDS WITH THE FADER SET AT THE RECQMMEMQEQ Pg-

SITION, THE MAIN AMPLIFIER POTENTIOMETER (VOLUME CONTROL) IS ADJUSTED

UNTIL THE PROPER souno EFFECTS ARE OBTA|NED- THE POTENTIOMETER as THUS

SET AT A PRESUMABLY PERMANENT ADJUSTMENT, IN KEEPING WITH THE s|zE or

THE THEATER, so THAT IN THE FUTURE, THE OPERATOR CAN SECURE soon RE-

SULTS rnom ANY RECORDS av ADJUSTMENT or THE FADER ONLY-

GUARDING AGAINST VIBRATION

VIBRATION MUST BE CAREFULLY GUARDED AGAINST IN THE AMPLIFIER EQUIP

MENT, SO THAT NONE OF THE TUBES WILL BECOME MICROPHONIC- THIS IS ESPEC:

IALLY TRUE IN THE CASE OF THE SOUND HEAD AMPLIFIER OPERATING OFF THE EN

EPGY OF THE PHOTO-CELL AND WHICH IS MOUNTED DIRECTLY ON THE PROJECTION

MACHINE ONE OF THESE AMPLIFIERS IS SHOWN IN FIG-7, WITH THE TUBES RE-

MOVED, AND HERE YOU WILL SEE HOW SPRING SUSPENSIONS ARE RESORTED TO, IN

ORDER TO PREVENT MECHANICAL VIBRATION FROM BEING TRANSMITTED TO THE TU-

BES OF THIS AMPLIFIER. .

A MICROPHONIC TUBE IN THIS FILM PICK—UP AMPLIFIER WOULD CAUSE A A

TERRIBLY ANNOYING HOWL IN THE SPEAKERS BECAUSE IT WOULD BE AMPLIFIED

TREMENDOUSLY BY THE SUCCESSIVE STAGES OF AMPLIFICATION- QUITE OFTEN, IT

IS NECESSARY TO PLACE A in RUBBER PAD UNDER EACH FOOT OF THE PROJECTOR,

PARTICULARLY IF THE FLOOR IS NOT FREE FROM VIBRATION-

IN CASES WHERE THE SERVICE DEMANDS ARE QUITE HEAVY UPON THE MAIN

AMPLIFIER, IT IS ADVISABLE TO HAVE AN EXTRA AMPLIFIER, WHICH CAN BE PUT

INTO USE IN THE EVENT OF THE MAIN AMPLIFlER'S FAILURE DURING THE SHOW-

ING OF THE PICTURE.

GETTING READY FOR OPERATION

'HAv:Hs CONSIDERED THE INSTALLATION or souun PICTURE EQUIPMENT, LET

us NEXT TURN oun ATTENTION To THE PROPER OPERATION AND MAINTENANCE or

THEsE UNITS. THE HosT LOGICAL WAY To APPROACH THIS SUBJECT IS TO conslg

ER THE STEPS JUST AS THEY SHOULD BE MADE WHEN ENGAGED IN TH|s wonx.

THE OPERATOR SHOULD ALLOW HIMSELF SUFFICIENT TIME BEFORE THEHSHOW"

TO ARRANGE ALL OF HIS EQUIPMENT AND TO GET HIS MACHINES READY FOR OPER-

ATJON- HE SHOULD HAVE ALL OF THE REQUIRED FILM RECORDINGS ETC. CLOSE AT

HAND, SO THAT EVERYTHING IS READILY ACCESSIBLE, AS A DELAY OF BUT A FEW

SECONDS CAN BE SUFFICIENT TO SPOIL A PERFORMANCE-

THE PROJECTOR SHOULD BE CHECKED CAREFULLY BEFORE EACH SHOWING-THIS

UNIT REQUIRES REGULAR OILlNG,CLEANING,ANO INSPECTION FOR WORN OR LOOSE

PARTS AND THE OPERATOR SHOULD MAKE IT HIS JOB TO STUDY THE FACTORY LIT-

ERATURE SENT WITH THE MACHINE, SO THAT HE IS THOROUGHLY FAMILIAR WITH

LEssoN No.3 PAGE 9

EVERY OIL HOLE ON THAT PARTICULAR UNIT.

ALTHDDGH OIL IS ABsoLuTELY NEcEssARv,vET IT MUST BE usED HITH DIS-

CRETlON,SO THAT NO SURPLUS OIL coLLEcTs ON THE FILM SPROCKETS OR GATEs.

OIL ON THE FILM FOR sILENT PICTURES Is BAD ENOUGH BUT WHEN SUCH ACCUMU-

LATIoNs DEVELOPE ON souND FILM IT PRACTICALLY RUINS PROJECTlON- FDR

THIS REAsoN,IT Is CLEAR THAT ALL SURPLUS oIL sHouLD BE VIPED DFF THE

WORKING PARTS AND THE BEST wAY To Do THIS Is To FIRST OIL THE MACHINE

WHEN NoT LDADED WITH FILH AND THEN To RUN THE PROJECTOR FOR A FEW MOM-

ENTs wITHouT FILH. AFTER THIS Is DoNE,THEN THE SURPLUS oIL cAN BE WIPEO

DFF CAREFULLY NITH A cLEAN "LINT~FREE" RAG.

STRAY BITS OF FILH AND EMULSION ARE FREQUENTLY DEPOSITED IN THE IN

TERIOR 0F THE MAcHINE AND THEsE cAN BE REMOVED WITH A BRUSH AND CLEANER.

ALwAYs wATcH FOR DEPOSITS 0F EHuLsIoN IN THE sLIT OF THE SOUND GATE,Es-

PECIALLY WHEN RUNNING NEW FILM BEcAusE sucH DEPOSITS HILL SCRATCH THE

SOUND TRACK AND THUS DESTROY THE FILM.

THE MAcH|NE,AND ESPECIALLY THE souND

GATE,sHouLD BE WIPED I ouT AFTER EAcH

REEL

CHECKING THE PROJECTOR LIGHT

BEAM ON THE SCREEN

THE NExT STEP Is To CHECK THE DIs-

TRIBUTION oF THE PRDJEETDHE LIGHT BEAN

UPON THE SCREEN- THE LIGHT SOURCE FOR

THE PICTURE SHOULD BE PROPERLY FocusED

To GIvE THE MAXIMUM UNIFORM ILLuHINA- ‘

TION UPON THE SCREEN AND THE LAMPHOUSE I

oF THE PROJECTOR Is PROVIDED WITH coN- F[G,$

TROLS FOR DoING THIs. WHEN PROPERLY AD- Chetkfng ;he ExCE¢,.La,vQ

JUSTED, THE LIGHT sHouLD BE coNcENTRA-

TED oN THE BACK 0F THE APERTURE PLATE (DPENING FOR FRAMING PICTURE) so

As To JUST COVER IT wITH UNIFORHLY DISTRIBUTED LIGHT.THE scREEN ILLDNIN

ATIDN cAN THEN BE CHECKED BY OPENING THE AuToNATIc SHUTTER AND THE Dow-

SER AND THEN TURNING THE PROJECTOR uNT|L THE REVOLVING SHUTTER ALLows

THE LIGHT To SHINE THROUGH ON THE scREEN.

THE INAGE or THE APERTURE SHOULD Now BE CENTERED oN THE SCREEN AND

IF IT Is OUT or CENTER, THE PROJECTOR HAY BE SHIFTED sLIGHTLv To THE

RIGHT OR LEFT AND RAIsED on LDHERED uNT|L IT Is PROPERLY GENTERED. CARE

MUST BE EXERCISED, HovEvER, so As NOT To DISTURB THE ALIGNMENT WITH THE

DISC TuHN-TABLE, IF THE LATTER Is ON A SEPARATE sTAND.

CHECKING THE FOCUS ADJUSTMENT OF THE EXCITER LAMP

THE souND HEAD oN THE PROJECTOR Is ALREADY ADJU$TED.AT THE TIHE or

ITS ASSEMBLY AND UNDER NORMAL OPERATION, ITS OPTICAL SYSTEM SHOULD NOT

GET OUT OF ADJUSTMENT- HOWEVER, UPON REPLACEMENT OF THE EXCTTER LAHP,lT

WILL BE NECESSARY TO REFOCUS IT. THE METHOD OF DOING THIS IS ILLUSTRA-

TED IN FlG.8. TO CHECK THE EXCITER LAMP ADJUSTMENT, THE TENSION_PAD AS-

SEMBLY IS REMOVED AND AN INDEX CARD IS INSERTED OVER THE PHOTO-CELL HI!

P*G5 '0 souno PICTURES

DOW AND THE EXCITER LAMP IS THEN ADJUSTED FOR MAXIMUM LUMINOSITY.A SMOOTH

OVAL SPOT OF UNIFORM INTENSITY INDICATES A PROPER ADJUSTMENT.

THERE IS GENERALLY ALSO SOME PROVISION MADE on THE MACHINE FOR THE

ALIGNMENT OF THE SOUND TRACK WITH THE SLIT AND THIS ADJUSTMENT SHOULD BE

CHECKED FOR EACH FILM BECAUSE THERE IS SOMETIMES A SLIGHT VARIATION BE-

TWEEN PRINTS.

ALL OF THE BATTERIES SHOULD BE CHECKED TO SEE THAT THEIR VOLTAGES

ARE NORMAL AND THAT THE CONNECTIONS OF THE STORAGE BATTERIES ARE TIGHT

AND FREE FROM coRRosIo~,AHo ALso THAT THE SPECIFIC GRAVITY OF EAcH or THE

STORAGE CELLS Is up To THE CORRECT vALuE.

CHECKING THE OPERATION OF THE SOUND HEAD

THE OPERATION or THE souno HEAD CAN BE

CHECKED IN THE FOLLOWING MANNER: FIRET, TURN

on THE HEAD AMPLIFIER AND THE EXCITER LAMP.

THEN TURN THE FADER UP To THE SETTING NORMALLY

REQUIRED FOR A sHow AND FOLLOW THIS av OPENING

THE sounn GATE AND INTERRUPT THE EXCITER LAMP

BEAM av MOVING A PIECE OF PAPER on AN INDEX

CARD IN FRONT or IT AS ILLUSTRATED IN FIG. 9.

Ir THE SYSTEM Is IN PROPER WORKING onozn, THEN

THE SUCCESSIVE INTERRUPTION or THE EXCITER

LAMP BEAM SHOULD cAusE A SERIES or SHARP RE-

PORTS To aE EMITTED FROM THE LOUD SPEAKERS.

SHouLo A SIGNAL OF THE PROPER INTENSITY

F‘G_9 BE OBTAINED av THE INTERRUPTION or THIs LIGHT

Chic‘/Hg ;hE Cygraflbn EEAM, THEH THE APPARATUS CAN NEXT BE TESTED

of ihe Jaufldheadl WITH A SAMPLE FILM. Fon FILM RECORDING, TEST

FILMS ARE AvAILAsLE, CONSISTING OF STANDARD

FREQUENCIES OVER THE RANGE or 60 To 8000 CYCLES, IN ADDITION To soME SI-

LENT sou~o TRACK AND VARIOUS SAMPLES or SPEECH AND MusIc. BY THIS MEANS,

THE OPERATOR CAN BE ASSURED or THE FACT As To WHETHER OR NOT THE SYSTEM

IS GIVING FAITHFUL sounu REPRODUCTION.

THE REHEARSAL

AFTER THIS PRELIMINARY TEST, IT IS ADVISABLE T0 RUN AT LEAST ONE

REEL OF THE PICTURE TO BE 5HOWN,DR BETTER YET,TO REHEARSE THE WHOLE 5H°W-

BY DOING THIS,THE OPERATOR CAN CHECK THE QUALITY AND LEVEL OF THE RECORD-

|NQ AND THU5 DETERMINE THE PROPER SETTING OF THE FADER AND TONE CONTROL.

AT TIMES, ESPECIALLY IN THE CASE OF FILM RECORDING OF THE VARIABLE

AREA TYPE, IT WILL BE NECESSARY TO SLIGHTLY SHIFT THE ALIGNMENT OF THE

FILM WITH RESPECT TO THE SOUND GATE, IN ORDER TO OBTAIN GOOD QUALITY

SOUND REPRODUCTION.

AT THE TIME or REWINDING THE nEELs,THE OPERATOR SHOULD NOTE THE ov-

ERLAPPING FRAMES es THE SUCCESSIVE REELs, so THAT THE VARIOUS REEL5 CAN

BE RUN orr IN CONTINUOU SECTIONS. DURING THIs REWINDING PROCESS, THE ow-

LESSON N0.3 PAGE 11

ERATOR SHOULD ALSO NOTE WHETHER OR NOT THERE ARE ANY SCRATCHES, TEARS,

OIL SPOTS ETC- ON THE FILM. BY NOTING ANY OF SUCH DEFECTS BEFOREHANO,

TROUBLE CAN BE AVOIDED DURING THE SHOW-

THREADING THE PROJECTOR

F|o.1O sHows YOU How THE FILM IS THREADED INTO THE PROJECTOR. No-

T|cE How THE UPPER LOOP IS MADE AROUND THE INDEX FINGER or THE LEFT

HAND. THE INDEX FINGER or THE RIGHT vs ALso usED To HoLD THE FILM IN

HLAcE,THus LEAv|Ns THE MIDDLE FINGER FREE TO PULL THE TRIGGER WHICH cL3

SES THE TENSION PAD AoA|NsT THE APERTURE- SYNCHRONIZATION oF THE SOUND

w|TH FILM RECORDING cAusEs L|TTLE DIFFICULTY BECAUSE INSTRUCTIONS FUR-

NISHED WITH THE MAcH|NE SPECIFY How MANY OF THE SPROCKET HoLEs IN THE

FILM To ALLOW BETWEEN THE APERTURE PLATE AND THE souND GATE- AT ANY

RATE, THIS DISTANCE SHOULD sE AsouT TR?" OR TWENTY FRAMESON sTAHoARD 35

MM. FILM, As YOU wERE ALREADY TOLD IN THE PREVIOUS LESSON- A SLIGHT vA5

TATTDN, sucH As ONE oR Two FRAMEs, cAusEs NO NoTTcEAaLE EFFECT;

|N THE cAsE or DISC RECGRDINGS, YOU WILL FIND A FRAME IN THE LEAD-

ER oF THE FILM MARKED "START", TH|s FRAHE sHouLD BE LINED UP WITH THE

APERTURE PLATE, AT THE sAHE TIME THAT THE PICK-UP UNIT IS PLACED on THE

STARTING MARK oF THE D|sc REcoRD.

THE PICTURE SHOULD

aE FRAMED UPON THE THE

scREEN BEFORE STARTING

THE PRouEtToR,AND AFTER

THE PROJECTOR |s F|RsT

THREADED, IT SHOULD BE

RUN EITHER BY HAND OR

MoToR FOR ONLY A FEw

FRAMEs, so As TO MAKE

suRE THAT THE FILM HAs

sEATED PROPERLYAND THAT

THE LOOPS ARE oF THE

PROPER LENsTH,so THAT

THEY WILL NE|THER BIND

NOR cATcH ON ANYTHING.

TH|s CAN BE DoNE BEFORE

THE PROJECTOR LAMP |s

TURNED DN.

STARTING THE PROJECTOR

THE PROJECTOR LAMP

0R ARC cAN Now BE TuRN-

ED ON BUT FIRST MAKE

SURE THAT THE DowsER

LEVER IS IN THE CLOSED ‘ ——

POSITION, so THAT THE F‘G_ 1C

PROJECTION LIGHT sEAM

°*""°T "55 T*“‘°“G“ "'5 Tfireaa//ng T‘/we Profecfivr /-/eaa’.

PROJECTOR HEAD. THE DO! ‘

PAGE I2 sou~0 PICTURES

SER CAN THEN BE OPENED FOR A SECOND, S0 AS TO CHECK THE ILLUMINATION ON

THE APERTURE-

SET THE FADER AT ITS ZERO POSITION AND BE SURE THAT THE DISC-FILM

SWITCH IS IN THE PROPER POS|TION~ IN THE CASE OF SOUND ON FILM PROJEC-

TION,THE HEAD AMPLIFIER AND EXCITER LAMP CAN NOW BE TURNED ON-

TH|s DONE, TURN on THE PROJECTOR MOTOR AND AS IT comes UP To SPEED

OPEN THE DOWSER As SHOWN |n F|c.11. NoTE THAT THE PICTURE |s PROPERLY

PLACED UPON THE SCREEN AND THEN TURN up THE FADER CONTROL To THE POSI-

TION PREVIOUSLY DETERMINED, WHERE THE SPEAKER VOLUME |s JUST RIGHT FOR

THE AUDITORIUM. DURING THE SHOWING or THE P|cTuRE,THE OPERATOR SHOULD

KEEP A CLOSE WATCH upon THE SCREEN, AS WELL As upon HIS EQUIPMENT AND

IN THE EVENT THAT THE FILM SHOULD TEAR, HE SHOULD aE PREPARED To srop

THE MACHINE IMMEDIATELY.

GUARDING AGAINST FILM BREAKAGE

THE BEST WAY TO STOP THE MACHINE UPON FILM BREAKAGE IS TO FIRST

CLOSE THE OOWSER AND THEN STOP THE MOTOR, BRINGING THE FADER BACK TO

ITS ZERO POSlT|ON- THE PROJECTOR SHOULD THEN BE RETHREADED AND THE FILM

SHOULD BE TEMPORARILY SPLICED ON THE “TAKE—UP" REEL WITH A PAPER CLIP-

ALWAYS BEAR IN MIND TO OBSERVE ALL FILM DEFECTS AT THE TIME OF RUN

NING A FILM AT REHEARSAL AND WHEN REWINDING A REEL, AS THIS PRACTICE

WILL CERTAINLY SAVE TIME AND EMBARRASMENT- IF PARTIAL TEARS EXIST ANY-

LESSON No.5 PAGE I}

IBLE, IT IS NECESSARY TO REPLACE THE REMOVED FILM SECTION WITH A BLANK

PIECE OF FlLM- SMALL GAPS AS THIS WILL PRODUCE NO SERIOUS EFFECT UPON

PROJECTION BUT IF TOO MUCH BLANK SPACE IS ALLOWED, IT WILL BE NOTICE-

ABLE TO THE AUDIENCE.

IN CASE THAT IT IS NECESSARY TO DISCARD ANY GREAT AMOUNT OF THE

FILM, THEN THIS PORTION WILL EITHER HAVE TO BE REPLACED WITH NEW PRINT,

OR ELSE AN ENTIRE NEW PRINT WILL HAVE TO BE PURCHASED. FOR THIS REASON,

IT IS IMPERATIVE THAT THE MACHINE BE SHUT DOWN IMMEDIATELY, WHEN THE

FILM TEARS, SO THAT AS LITTLE DAMAGE OR POSSIBLE WILL RESULT.

SPLICING FILM

FIG. I2 suows YOU THE PROPER METHGD OF SPLICING SOUND FILM. IN THE

UPPER ILLusTRATIoN,You WILL OBSERVE How THE SPLICE IS MADE ALoNG THE

FRAME—LINE AND WHEN REMOVING A sEcTIoN or FILM,NEvER REMOVE LEss THAN

oNE FRAME AND NoT MoRE FRAMES THAN ARE ABSOLUTELY NEcEssARv.THE Two ENDS

TD BE SPLICED SHOULD BE LINED UP ACCURATELY, so THAT THE FILM cAN RuN

THRouGH THE MAcHINE IN PERFECT ALIGNMENT.

A GOOD SPLICE WILL PASS

THROUGH THE SOUND GATE sATIs-

FACTDRILY BUT sINcE IT Is IM-

POSSIBLE To MATCH THE souND

TRACK As uNNoTIcED AS THE PIC-

TuRE rRAMEs,IT WILL—ALWAYS cRE

ATE soME DISTURBANCE IN THE

SPEAKERS As IT MovEs PAST THE

souND GATE. THIs EFFECT, How-

EvER, CAN BE REDucEDMATERIALLv

av PAINTING A NoN- TRANSPARANT

TRIANGLE ovER THE SOUND TRACK

AT THE POINT OF SPLIC|NG- THIs

As SHOWN AT "A" OF FIG.I2.

Co rrecl‘: M z+.I'\ed

‘<fsq-nus llfl Ill IE5:

THIs TRIANGLE SHOULD BE

PAINTED ON THE SOUND TRACK CAREFULLY RITH "ZAPoN" CONCENTRATED BLACK LA-

CQUER #2002-2 AND IT Is VERY IMPORTANT THAT THE sIzE AND SHAPE OF THIS

PAINTED TRIANGLE BE JUST ExAcTLY AS ILLusTRATED AT "A"oF FIG. 12. IF

THIs PAINTED TRIANGLE Is MADE EITHER Too LONG 0R To SHORT As sHowN IN

"B" AND "C" or FIG.12, THEN A VERY PRONOUNCED EFFECT WILL BE PRoDucED AS

THE SPLICE PASSES THE SOUND GATE.

IN cAsE THAT THE FILM HAS PREVIOUSLY BEEN DAMAGED TosucH AN ExTENT

THAT THE ExAcT AMOUNT REMOVED Is uNcERTAIN,THEN THIs cAN BE CHECKED BY

THE NuMaERs ON THE FRAME. THAT Is, EAcH sERIEs OF I6 FRAMEs ARE PRoGRE-

SSIVELY MARKED I-2-3 ETC , BEGINNING WITH zERo AT THE "sTART" FRAME. Do

NoT CONFUSE THEsE FRAME NUMBERS WITH THE scENE NuMaERs, wHIcH ARE ALso

RRovIDED HowEvER, THEsE Two sERIEs or NUMBERS CAN BE READILY DISTIN-

GuIsHED FROM EACHOTHER DUE To THE FACT THAT THE scENE NUMBERS ARE PREcg

DED AND ALSO FOLLOWED BY A DAsH, sucH As -37-.

WHEN USING TWO MACHINES, AS IS THE GENERAL PRACTICE FOR COMPLETE

=AsE IR

SOUND PICTURES

"sHous", THEN IT |s IMPORTANT To DETERMINE B

NEAR THE END or REEL #I FOR THE VARIOUS STAR

own MACHINE IN WHICH REEL #2 |s |HsTALLEo.

TAHcE THAT THE FADING BE PROPERLY HANDLED wH

%vn~"

 H  "1?-B/bf.

__-—

gf§S£

FIG.13

/I 7_;//o/'ca/ Moi-/'0/-1 P/Ir/z/re 501//70’ 7?:/ck.

TAINERS, IS THAT WHICH IS INSTALLED FOR USE

EFORE HAND, THE PROPER CUES

TING

OPERATIONS OF THE SEC-

IT us ALso or uTHosT IMPOR-

EN SWITCHING FROM ONE MACH-

IN TH

INE TO THE OTHER, so

THAT THE PICTURES on

THE SCREEN AND THE

souuo ACCOMPANIMENT

WILL BOTH coHT|uuEw|TH

ouT INTERRUPTION.

PROTECTING THE FILM

F|LH IS ALwAYs

DELIVERED IN METAL cog

TAINERS AND IN ORDER

To PRESERVE ITS QUAL-

lTl£S,IT SHOULD ALwATs

BE KEPT IN THEsE con-

TAINERE. THE ONLY FILM

wH|cH SHOULD EVER BE

LEFT ouT or THEsE con-

E HAcH|uEs AND THAT on

THE REHINDING RACK AHo EVEN THEsE sHouLo NOT BE LEFT LYING AROUND Ex-

POSED FOR ANY GREATER LENGTH or TIME THAN rs AasoLuTELv NECESSARY. Nor

oNLY’1s’THE’buALiTY'oF THE FILM PRESERVED av KEEPING |T "soxsu" BUT THE

FIRE-HAZARD IS ALso REDUCED aEcAusE MOVING PICTURE FILM IS THE HosT IN-

FLAHABLE SUBSTANCE PRESENT IN THE PROJECTION aooTH.

PORTABLE SOUND EQUIPMENT

So FAR, ALL OF THE souuo RECORDING T H

EQUIPMENT, wH|cH HAs BEEN DESCRIBED T0

YOU, as ADAPTED PRIHARILY As A PERMAN-

ENT INSTALLATION IN THE sTuo|o. HOWEVER,

To PHOTOGRAPH SCENES on "LocAT|oH" AT

OUT—OF-THE—WAY PLACES,PROV|5lONS HusTaE

MADE so THAT souno EQUIPMENT OF PORT-

ABLE DESIGN cAH as TAKEN ALo~c. THE

souuo EQUIPMENT FOR sucH PURPOSES IS

TRANSPORTED IN A I5 To 2 TON TRUCK SIM-

ILAR To THAT sHowH IN F|e.lR.

A LITERAL LABORATORY IS CONTAINED

HITHIN sucn A TRUCK BECAUSE IT zs |HPE5

ATIYE TO HAuL PRACTICALLY ALL or THE -

EQUIPMENT vH1cH WOULD ORDINARILY BE RE-

QUIRED IN THE STUDIO. In EAcT,THE REC- ‘

ORDING AMPLIFIER AND THE RECORDING UNIT 1 "E_

ITSELF ARE NEARLY ALwAvs DUPLICATES To ;|5_ |4

THosE USED IN THE STUDlO- A3g¢0r¢h)u; L/nff flv

Cfin¢n¢/ 755/céz.

ALTHOUGH STUDIO TYPE AMPLIFIERS,

LESSON NO.3 PAQE I5

WHEN SUITABLY MOUNTED, CAN BE USED OUT IN THE FlELD,YET THE COMMON PRAE

TICE IS T0 USE TUBES OF LOW POWER CONSUMPTION AND OFTEN,THE AMPLIFYING

STAGES ARE SPLIT UP INTO MORE UNITS THAN USED IN THE STUDIO» FOR EX-

AMPLE, THE MICROPHONE AMPLIFIER, WHICH IS LOCATED CLOSE TO THE PICK UP)

MAY BE MADE UP IN TWO STAGES- THIS THEN CAN BE FED INTO A PORTABLE, DRY

BATTERY OPERATED AMPLIFIER OF THE BROADCAST TYPE, WHICH IS ALSO LOCATED

NEAR THE PICK—UP POINT AND THIS IN TURN CAN BE FED INTO AN OUTPUT AMPLI

FIER OF TWO STAGES, WHICH IS HOUSED WITHIN THE TRUCK CLOSE TO THE RE-

CORDER.

Two INTERNAL vncws OF THE souun TRUCK ARE snowu nu Fnas. nh Aunlj.

Ir ns or SPECIAL nursnzsr nu Fnc.|5, no uor: THE LARGE CABLES AND conu-

ECTORS usso ron c0NNEcTnue nnzuncaopn-nou: - —fi

cnncunrs T0 THE MIXER PAu:L.AL1Housn THE

cuancur CARRIED av rues: LINES ns SMALL

zuousn ro PERMIT THE us: or uucu SMALLER

TERMINAL$,YET wucnz NOISE-FREE couu:c-

TIONS ARE so VITAL As nu PICTURE RECORD-

Iuc, nT ns ADVISABLE TO so TO THE ADDED

EXPENSE or usnus MASSIVE WATERPROOF rznu

INALS- lu FACT, LARGE RINGS ARE scR£w£o

oowu oven rues: couuscrnous AFTER THE

PLUGS HAVE azzu nussnrso nu THE JACKS-

THE SOUND TRUCK, AS WELL AS THE

CAMERA TRUCK, ARE PROVIDED WITH THE NEC-

ESSARY EQUIPMENT SO THAT TEST FILMS CAN

BE DEVELOPED. THIS IS NECESSARY SO AS TO

DETERMINE THE EXPOSURE CONDITIONS, POSI-

TION AND DENSITY OF THE SOUND TRACK ETC.

BECAUSE IF DEFECTS RELATIVE TO THESE

POINTS ARE NOT DISCOVERED UNTIL BACK IN THE STUDIO, A TREMENDOUS EXPEN-

SE WOULD BE ADDED TO THE COST OF PRODUCTION-

FIG.15

/V/l'x/rzg Pans/ /A1 Sou/10’ 7Fuck

THE POWER SUPPLY FOR PORTABLE EQUIPMENT

Ou: 0F THE GREATEST PROBLEMS or PORTABLE souuo squnpucur I5 THAT

or THE POWER SUPPLY. TH: ALTERNATING cuRREuT SUPPLY FOR INYERLOCKING

rue CAMERAS Auo souuo RECORDERS ns GENERALLY SUPPLIED sv A IIO/220 VOLT,

3 PHASE, 50/60 CYCLE GENERATOR. BY usnue THIS sauna: or ENERGY, nr ns

POSSIBLE no OPERATE vac SAME nzcoannuc zaunpusur As THAT uszn nu THE srg

ono wuenc ru: MUNICIPAL POWER SUPPLY ns uosr GENERALLY or rue 50/60 cv-

cns TYPE.

As A RULE, THIS A.C. GENERATOR ns uor onnvzu DIRECTLY FROM A GAS-

OLINE zucnus BECAUSE or THE onrrncuxrv or MAINTAINING THE CLOSE swzzo

REGULATION wnncu ns NECESSARY. So INSTEAD OF runs, tn:-conuou PRACTICE

IS TO HAVE A GASOLINE zusnuz on A SEPARATE POWER rnucx unnve A D.C.eEu-

ERATOR, wnncu nu runu SUPPLIES woven TO A D.C.-A.C. MOTOR GENERATOR on

ELSE AN nuvznrzo ROTARV couvERT£R, vnrn APFROPIATE VOLTAGE REGULATORS,

spasm REGULATING, CONTROLLING AND nzrsnnus zounpusur.

PAGE I6

EvEN THIS COMBINATION cAusEs DIFFICULTIES, DUE TO THE NOISES IT

PRouucEs, AND vH|cH MAY INTERFERE HITH THE RECORDING THAT |s GOING oN

NEARBY. So, TO OVERCOME THIS PROBLEM, A 32-voLT STORAGE BATTERY us

FREQUENTLY USED To DRIVE THE MOTOR—GENERATOR sET, THE MOTOR END or WHICH

ls A j2-v0LT D.C. MACHINE. THIS ARRANGEMENT Ts COMPARATIVELY QUIET AND

MAY BE USED WITHIN A FEW HUNDRED FEET OR LESS FROM THE PICK-UP POINT-

TH|s STORAGE BATTERY cAN BE KEPT IN A CHARGED CONDITION BY A GASOLINE-

DRIVEN GENERATOR, WHICH us OPERATED ONLY DURING THE NIGHT, 0R AT oTHER

TIMES HHEN NO RECORDING IS BEING DONE. '

Fon THE FILAMENT SUPPLY OF THE AMPLIFIER TUBES, EXPOSURE LAHPs,ETc.,

A 6-I2 voLT STORAGE BATTERY or THE I00-I50 AMPERE—HOUR SIZE |s GENERALLY

USED. THE PLATE VOLTAGES FOR AMPLIFYING EQUIPMENT HHEN ON LOCATION ARE

GENERALLY OBTAINED FROM DRY "B" aATTER|Es; ALTHOUGH SMALL STORAGE-TYPE

"B" BATTERIES ARE SOMETIMES USED FOR THIS PURPOSE, IN HH|cH cAsE THEY

cAN BE KEPT IN A CHARGED CONDITION BY A SMALL D.C. GENERATOR.

EXAMINATION QUESTIONS

LESSON NO. sP-3

I» - IS IT ADVISABLE TO INSTALL SOUND PICTURE EQUIPMENT IN A

THEATER ORIGINALLY DESIGNED FOR SILENT PICTURE PROJECTION;

WITHOUT MAKING ANY CHANGES IN THE AUDITORIUMT

2. - SHouLo THE scREEN FOR souun PICTURES BE cLosELY WOVEN oR

LOOSELY WOVEN?

3. - IS HEAVY DRAPERY CLOTH GENERALLY PLACED OVER THE MOUTH OF

THE SPEAKER HORN TO REDUCE EXCESSIVE REVERBERATIONT

H. - IS IT A BETTER PRACTICE TO KEEP THE STORAGE BATTERIES IN

THE PROJECTION BOOTH ON THE CHARGING LINE DURING THE

SHOUING OF A PICTURE, OR DURING PERIODS WHILE NO SHOW IS

IN PROGRESS?

5. - WHAT PRECAUTIONS SHOULD EIEXERCISEDIN CLEANING AND OILING

A PROJECTOR FOR SOUND-ON—FILM PROJECTIONS?

6. - DESCRIBE HOW YOU WOULD CHECK THE FOCUS ADJUSTMENT OF THE

EXCITER LAMP IN A SOUND-ON—FILM PROJECTOR-

7- - DESCRIBE BRIEFLY HOV A FILM HAVING A SOUND TRACK SHOULD

BE SPLICED-

8. - DoEs A souNo TRUCK, WHICH IS USED TO TRANSPORT souuo

EQUIPMENT To "LocAT|oNs", GENERALLY coNTA|N PRACTICALLY

THE sAHE EQUIPMENT As THAT USED IN THE sTun|o?

9. - WHEN USING AN A.C. GENERATOR ON "LocAT|oN", IS IT coHHqN

PRACTICE TO DRIVE THIS GENERATOR DIRECTLY OFF A GASOLINE

ENGINE? '

IO- - EXPLAIN HOW THE OPERATION OF THE SOUND HEAD MAY BE

CHECKED.