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634 RICHARDSON'S BLUEBOOK OF PROJECTION
(g) In some theatres the above tests are followed by a trial run of sound, as a check upon quality.
The above list represents what is perhaps average procedure. In any individual projection room there will be other items, perhaps many others, that can and should be checked before the show is started. In this matter individual conditions are the only guide.
Routine During the Show
(9) Having completed his preliminary inspection the projectionist threads up the first two reels of the show and waits for the starting buzzer or for the scheduled starting time.
Where two projectionists are engaged they commonly check on each other's work in threading up the film. This is a routine precaution of inestimable value.
At schedule time or at a buzz from below the projectionist starts the motor of the projector that carries the first reel of the performance, switches his fader to that projector as soon as proper running speed is reached, and adjusts his volume control, if necessary, for that monitor volume which corresponds to correct volume in the auditorium.
His responsibility during the show with respect to threading, removing, inspecting, repairing and storing film is explained on Pages 167 to 200. His responsibility with respect to projecting a bright, clear and steady picture requires no explanation.
(10) His sound responsibility sometimes includes listening to the monitor and adjusting volume whenever necessary to compensate for inequalities in the recording, but this is poor operating practice. As explained below, volume should always be controlled by signals from1 the auditorium. When the monitor is used it should always be kept as low as possible, since if heard in the auditorium it sounds like echo coming from the rear wall. Even where the projectionist is solely responsible for volume the monitor is often turned off entirely, except for changeovers, during pictures in which the recording is known to be of constant level.