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CHAPTER XXXI OPERATION OF SOUND EQUIPMENT
(1) No matter how familiar a man may be with the principles underlying the action of sound equipment he still needs a great deal of detailed information about any projection room he enters for the first time. The type of information needed may be classed under two heads, namely, detailed instructions for operating the particular make and model of apparatus installed, and detailed knowledge of the wiring, fuse locations, etc., in that individual projection room.
Obtaining Detailed Information
Five possible sources of such information are open to the newcomer, (a) The necessary knowledge may be obtained from the projectionist previously in charge, if he is available, (b) If the theatre is one of the large number that are regularly visited by a sound service engineer, that engineer may be called in to instruct. He will be thoroughly familiar with the system and able to answer all necessary questions, (c) If the projection room equipment has been properly marked and tagged and charted, as explained in detail further on, no instruction will be necessary. Any competent projectionist will be able to run his show by referring to that information, (d) Any brother projectionist who has had experience with equipment of the same make and similar model will prove helpful, (e) Lastly, even if the apparatus has not been properly marked, search of the projection room should turn up the operating instructions that every manufacturer of sound equipment furnishes to his customers.
In the very rare cases where all these aids are missing a competent projectionist will still be able to study out
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