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MANAGERS AND PROJECTIONISTS 693
racks, sleeve rollers, etc. This lamp lubricant is put up in cans by the International Projector Corporation. Be sure and do not use too much of the lubricant, and do not get any on the mica insulation. You will be surprised how much better you can handle the light. Keep metal clean where carbons make contact with it. Scrape and clean thoroughly at least once a week. Dirty carbon contacts induce heating and loss of power and light. Be sure the wires make a good electrical contact with lamp binding post. When terminal lugs become burned, throw them away and put on new ones. It does not pay to use burned lugs. When wires inside lamp house become burned (the life gone out of them) cut away the burned portion. Burned wires cause high resistance and loss. Unless removed, they will eventually burn off entirely, causing vexatious delay.
POWER'S ROLLER PIN INTERMITTENT MOVEMENT —HOW IT WORKS
IN drawings A, B, C, D, Fig. 245, you see principal parts of the Power's Roller Pin Intermittent Movement in four successive stages or cycles of operation. The cam and pin cross are assumed to be revolving in a clockwise direction as indicated by the arrow. The intermittent sprocket is engaged with a short strip of film. The section marked E of this film lying between the two heavy black cross lines represents one frame or picture.
In figure A the four rollers of the pin cross are shown in engagement with the locking ring of the cam, rollers No. 1 and 2 being at the outer circumference and pins Nos. 3 and 4 at the inner circumference of the ring. The ring is free to revolve between the four rollers but cannot impart motion to the pin cross as the rollers are securely locked between the inner and outer surfaces of the locking ring and consequently the pin cross, sprocket and film are at rest and one frame or picture is being projected to the screen while stationary.
In Figure B the end of the locking ring is just passing out from between the four rollers and the diamond of the cam is starting to engage with roller No. 1. As the movement of the diamond progresses the roller and pin on which it revolves is pushed forward and downward, thus imparting a rotary motion to the pin cross spindle and the intermittent sprocket attached to it pulls the film downward. Figure C shows the position of the parts of the intermittent movement near the