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VARIOUS APPARATUS 79
10. Select a perfect needle. Insert it in the reproducer securely and place it exactly on the starting mark indicated on the disk.
n. Check all loops, idlers, and sprockets. Make sure that the number on the disk and the film correspond. Be certain that the starting mark on the film is in perfect frame and that the needle is fastened securely, tracks correctly, and is placed exactly on the starting mark indicated on the disk.
12. Turn down the record the required number of full turns indicated on the cue sheet, making sure that the film and the needle are tracking properly during this operation.
13. Strike the arc and start the motor on the cue. When all is up to speed, raise the dowser and on the proper cue bring the fader up to the required mark as per cue sheet.
14. Give the second projection the cue to strike the arc on the second machine, and stand by for change-over.
15. Stand by for the cue indicating the end of the record. Make the change-over on the fader to the second projector at the cue.
Experience has shown that the average record may be run from eighteen to twenty-two times with fairly good results. Occasionally, when there is a defect in manufacture, or because of excessive needle scratching, a record will last only a few runs. Talking records generally do not last as long as music records. It is advisable that three records of each subject be on hand in the projection room for pictures that are played for a full week. Caution should be taken not to permit the supply to diminish to one record and thus make possible an insurmountable emergency on account of any breaking or scratching of this last disk.
In the case of breakage and repairs it is possible to proceed without a stop to re-wind if the break occurs below