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OPERATION OF SOUND EQUIPMENT 633
for the show, starting the show, operating it, and closing down at the end of the day.
Routine Before Starting
(7) It is common practice for the projectionist to start work from fifteen minutes to an hour before the scheduled beginning of the show. Many theatres pay for such additional time, and all will find it worthwhile to do so. Many small items of care, resulting in the aggregate not only in a better performance but in prolonging the life of equipment, cannot be attended to properly while a show is running.
(8) The procedure before the show varies from theatre to theatre, and according to the type of apparatus. In general it runs approximately as follows :
(a) Apply lubrication, according to a prepared routine that makes certain nothing is overlooked.
(b) Check condition of storage batteries (if used) and of dry cells (if used).
(c) Switch on the system, and check all meter readings.
(d) Inspect exciting light focus of both projectors, adjusting it if necessary.
(e) Make click test for sound. This test is made by removing the sound gate (if necessary) and interrupting the exciting light. Moving a pencil or a finger rapidly through the beam is the usual method. A rumbling or clicking sound will be heard in the speakers if the system is functioning. Click test of the disc reproducer is made by brushing a finger against the needle. The microphone is tested by speaking into it. These tests should be applied to both (or all three) projectors, to all disc reproducers, synchronous or non-synchronous, and to all microphones that will be used in the course of the day's show.
(f) Where there is more than one stage speaker the click test should be repeated for each speaker separately, to make sure that all are working. This last, however, is not possible in all theatres. In some the speakers cannot be switched on and ofT individually.