Motion picture projection : an elementary text book (1928)

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856 MOTION PICTURE PROJECTION Inside of Control — Put a little heavy grease in eccentric pin slot on rocker arm No. 113 and oil the rocker arm pivot screw. Do not oil pawls or ratchets. Do not fill the control box up with grease as this will tend to interfere with the free action of the pawls. Caution : Do not oil armature bearings or any part of the feed magnets. Care of Lamp : See that all screws and nuts, especially on the burner, are tight. Any screw or nut clamping a lead or a contact must be tested with a wrench or screw driver from time to time to see that they stay tight. On such apparatus as a lamp that runs hot, screws and bolts are constantly loosening up and if not tightened in time may cause no end of trouble. The hex head bolts holding the negative head must be watched closely. If they loosen up, which they will in time, on account of the insulation washers No. 71 shrinking because of the heat, the negative will get out of line with the positive. Don't let dirt accumulate on the burner. In General : Carry enough spare parts to take care of any emergency. We would suggest that the following be always on hand in the booth : 2 No. 3 Positive nose cap 2 No. 4 Upper contacts 4 No. 5 Upper contact springs 2 No. 15 Third Electrodes