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THE FILM 199
occur in some places and cannot be guarded against), and possibly a weakening of the motor itself, which is unlikely, the pick-up of any projector motor, once calculated, will always be the same.
(82) The process must be repeated for each motion picture projector you have, since there may be decided variations in pick-up speed in projectors located side by side.
(S3) To start close the switch of the idle projector motor when the motor cue appears. The instant the change-over cue appears on the screen operate the dowser.
Checking Synchronism
(84) The standard release may be used for checking synchronism. Any variation in the size of the loop between the projector and sound head aperture will destroy synchronism.
When the start-frame is threaded over the aperture and the loops are of correct length, there will be a diamond mark over the sound aperture. The diamond mark is located twenty frames in advance of the startframe. (85) For perfect synchronism examine the location of the diamond mark at every threading. Turn the flywheel until the right motor-start frame is over the aperture. Experience will enable the projectionist to judge the loop size very accurately.
Disc Record Threading
(86) To thread for disc, place the needle on the record at the synchronizing mark. Thread the projector with the motor-start mark over the aperture. Rotate the flywheel until the change-over frame appears at the aperture, meanwhile counting the revolutions of the turntable in order to short-cut the process next time.
Upkeep of Standard Release Print
(87) Projectionists who take pride and interest in their work will do nothing to diminish the effectiveness of the standard release print. Every frame cut away