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180 MOTION PICTURE PROJECTION
FILM
Motion picture film is a strip of flexible, supple, transparent celluloid 1%" wide. One side of the film is given an emulsion coating much the same as on an ordinary photographic film pack. The margin of the film is perforated, there being 64 perforations to the foot of film or four on either side of each picture (16 pictures to one foot of film) these perforations are for the purpose of feeding the film through the camera or projector. The film comes to the projectionist on metal reels, each reel containing approximately 1,000 feet of film, generally five or six reels making one feature picture. The projectionist should always examine his film before running it through the projector; this he does by running the film from one reel on to another, by using a rewinding machine and letting the film pass between the first finger and thumb of the left hand; care should be taken to see that all patches are secure, that the film is free from "frame-ups" and that the perforations are in such a condition that the film will pass readily through the projector without jumping off the sprockets. The reels should then be placed in a fireproof film cabinet in chronological order, care being taken to see that the film is wound on reels emulsion side out and that the beginning of the film subject comes off first, in other words that the film does not go through the projector tail-end first. Remember that the film passes through the projector upside down and emulsion side to source of light. As soon as the film has