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OPERATING MANUAL 137
the projection room if the installation is equipped for film reproduction. 5. Turn off the storage batteries at the battery panel.
With a 46-A amplifier proceed as follows and always in the order given here:
1. Turn off the horn safety switch.
2. Turn off the starting switch on the 46-A amplifier.
3. On D. C. supply, turn off the motor generator switch.
4. Turn off the film pick-up switch on the front wall of the projection room if the installation is equipped for film reproduction.
5. Turn off the storage batteries at battery panel.
4. Splicing film — disk reproduction
Vitaphone film has sixteen frames per foot, and each foot is numbered. Beginning with "O" at the starting mark, the sixteenth frame after the starting mark is marked "1." The sixteenth frame after number 1 is marked "2," and so on throughout the print. There are, therefore, fifteen frames without numbers between each pair of numbers. By this system the position of every single frame in the reel is indicated. In synchronized features there are, in addition, other numbers on the margin of the film, which indicate the scene numbers of the picture. These can be distinguished from the footage numbers because they have a dash at each side; for instance, "-286-," the footage numbers themselves being simply "286," without the dash at either end. In cases where the scene and footage numbers conflict the footage number is omitted but is counted, and reference will have to be made to the next footage number in sequence.
If a footage number does not appear at each sixteenth frame continue counting until you reach the next number, when you should have 31 frames between the two footage