Sound motion pictures : from the laboratory to their presentation (1929)

Record Details:

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OPERATING MANUAL 125 on the film and holds it close up against the aperture plate in front of the lens tube. 7. On synchronized feature pictures, by starting and stopping the motor with the starting switch, run off as much film as necessary to bring the end of the "Part No." leader approximately up to the projector aperture. Important Note: Projectionists should never attempt to stop or slow up a projector equipped for disk reproduction by holding the turntable, as this will cause damage to the apparatus and spoil the synchronism for the subject. The turntable coasts about four turns after the power is shut off. Never remove the record clamp or attempt to put it on while the turntable is revolving. III. DISK REPRODUCTION To set up the record and film ready for operation, proceed as follows: 1. See that the fader is at zero and that the pick-up circuits are connected to it. 2. See that the reproducer is in rest. Put in a new needle. 3. Select the film and record to be used and be sure to check the number of the record against number of the film. Mark the record on label to show the number of times used, counting this run. 4. On the projector, place the framing lever in central position. Move the projector mechanism by turning the flywheel on the motor so that the shutter cut-off blade is uppermost, the lens is open, and the intermittent has just ceased moving. Thread the mechanism with film in the usual manner, placing the frame marked "Start" directly in front of the aperture. On Simplex and Motiograph, this step is easier if it is remembered that when a frame is in front of the aperture the lower edge of the aperture plate track will be between the eighth and ninth sprocket holes from the lower edge of the frame. Therefore, splice a white leader on the