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MANAGERS AND PROJECTIONISTS 779
new tooth surface to the film, if the teeth are worn on one side.
INSTRUCTION NO. 57.— We would by all means advise all purchasers of the Baird projector either at the time of purchase or later on to secure a complete part comprised of 40P, 41P, 51P, 42P and 44P, P. 2. Then when your intermittent sprocket, shaft, bushing or star is worn, all you have to do is to remove the complete part, substitute the new one and send the old one to the factory for inspection and repairs. This is in every way much better than to attempt to put on a new intermittent sprocket. The intermittent sprocket is the heart of a moving picture projector, and it must not only be true down to as little as one-tenthousandth of an inch, but it must be mounted absolutely true also, and the projectionist is seldom in a position to do a delicate job of this kind properly.
INSTRUCTION NO. 58.— The wear of the bushing carrying shaft 170P, P. 1, supporting lower sprocket 452P, P. 1, will have the effect of increasing the distance between the sprocket and its idler. Should you begin to have trouble with losing the lower loop, first see if you can move the outer end of the lower sprocket up and down perceptibly. If you can, the bushing is probably somewhat worn and the distance between sprocket and idler has increased. The remedy is to loosen the idler. (See Instruction No. 55.) When you are making this adjustment hold down on the sprocket; then adjust idler roller to suit this condition.
INSTRUCTION NO. 59.— There should be just sufficient pressure between friction disc wheel 622P, P. 4, and driving friction wheel to cause disc wheel 622P, P. 4, to continue to revolve when belt 659P, P. 4, is slipping on pulley. This pressure is regulated by a knurled nut at the rear end of the shaft, carrying disc-wheel 622P, P. 4. To test the drive, start the motor and grasp the flywheel firmly, causing the belt to slip on the pulley. Any unnecessary pressure between friction disc-wheel 622P, P. 4, and the driving friction wheel will cause excessive wear and loss of power and probably heating of the motor.
INSTRUCTION NO. 60.— At the lower end of rod 63VP, P. 4, is a casting supported by a stud attached to the rear wall of the compartment. This casting is supported on the stud by a clamp lined with fibre. Should at any time the knob 512P, P. 4, develop a tendency to work up or down while the