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OPERATION OF SOUND EQUIPMENT
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(4) If the incoming projectionist does not find all wires carefully tagged or charted he should ask for enough overtime to do the job, calling on the sound service engineer, if the theatre is receiving sound service, to work with him. He should do this for three reasons. First, for his own guidance to quick repairs, in time of trouble. Second, as fair play to his successor in that projection room. Third, because he may be sick or take a day off, and the relief projectionist that replaces him will need the same information.
Other information, in addition to wiring detail, should be made available. Correct meter readings, if not shown by a red line on the dial of the instrument, should be marked on the glass with a red china-marking crayon or in some other conspicuous way. "On" and "off" positions of all covered switches should be similarly marked. So should normal operating positions of rheostats and other controls. Correct battery charging current should be indicated on the charger panel, and so on.
Last, all switches and other controls should be numbered or otherwise plainly identified, and complete operating instructions describing their use in detail then drawn up and posted in a prominent place. These instructions should include everything the projectionist himself would want to know if he entered that projection room for the first time as a new man unfamiliar with its equipment. The manufacturer's information pamphlet should form the back-bone of this data, but must never be regarded as complete in itself for the reason that it does not and cannot take account of individual peculiarities.
Having taken these precautions the projectionist in charge can report sick or on vacation with a clear conscience, knowing that any competent relief man will be able to keep the show running without trouble, and will not injure the apparatus.
Inspection Forms
(5) Since all sound equipment needs both inspection and attention, written or printed routine forms are the