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FOR THE IMPROVEMENT OF SOUND-ON-FILM PROJECTION
Efficient projection of talking motion pictures depends on the careful handling of the Sound film.
Caution. Never attempt to run a "sound" film on any other than a sound projector. Irreparable damage to Sound Film will result from nmning it on a "silent" projector.
The beam of light in the sound head is so fine, and the photo-electric cell so delicate, that every grain of dust on the sound track or the least scratch in the emulsion will cause magnified, unnatural noises and a distortion of the sound.
The film should never be pulled tight, or "cinched" on the reels. When this is done, each layer of film slides on the next and dust particles scratch the emulsion and damage the sound track.
Keep the film gate clean. As the film passes through the gate, a certain amount of emulsion is scraped off which, if allowed to accumulate, forms a hard scale on the guides. Sometimes the friction of this scale is so great that the perforations of the film are torn by the intermittent trying to feed the films thus tightly held.
When the film breaks. If the film should break, quickly stop the machine to prevent injuring the film, and rethread the remaining portion, putting the tip end of the rethreaded part far enough under the loose end of the previously projected film on the take-up reel so that the loose end of the projected portion will lap over the tip at least one complete revolution of the lower reel, and thus hold it securely when the instrument is started again.
Make no splices in sound films. Breaks in the films will be repaired b}' tlic Library, where the splices will be properly opaqued. Should the film be mutilated, return the damaged part with the reel, so that the Library can make replacement of the identical part, thereby keeping tlie continuity complete.
Never use bent or defective reels which may injure the sound track.
Be sure to read and preserve the book of instructions sent with your projector. Follow threading operations in ez'ery detail. Oil as directed. Nine-tenths of operators' troubles are due to failure to read and follow instructions.