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1050 HANDBOOK OF PROJECTION FOR
serious damage to the sound track, or even to entirely ruin it, which, of course, means ruin to the entire film, because the picture part is useless without its sound track.
If the apparatus is such that deposit is possible, it is imperatively necessary that the projectionist make it his invariable rule to carefully run his finger over the metal above and below the sound gate aperture before he threads in a film. Do not fail in this. A single failure may cost the total ruin of an entire reel of film.
If there is a deposit, no matter how small, remove it before threading in the film, but do not scratch it off. Never, never, never do that! If you do, and more especially if you are foolish enough to use a knife blade or other steel instrument, you will inevitably roughen the metal surface and thereafter may look for trouble constantly from deposits.
Remove such deposits with a wet cloth, or by dampening your finger tip. Use water and nothing else!
It will soften such deposits immediately. It is the only right, safe way!
KEEP THE ENTIRE SOUND TRACK SCRUPULOUSLY CLEAN. — In addition to the necessity for keeping the sound gate sound track clean, it is almost equally necessary that the entire track the sound track passes over from upper to lower reel be carefully examined at least once every day.
Beginning at the upper magazine, examine the fire trap rollers to see that they revolve freely, and are perfectly clean; also that they have no flat spots, though the latter would not, of course, occur unless a roller had