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that no light can pass through the sound track where you have painted the join, it will be because the thickness of the join itself is actually lifting the film from its usual contact with the sound-drum or roller, and thus permits a brief flash of incidental light to reach the P.E.C. This can be prevented by screening any light from your sound-head and, perhaps, by making a better join next time.
Preventing Damage
Dirt and oil are the arch-enemies of film, but also included in this category are the careless operators — the gentlemen responsible for film mutilation.
Films may be mutilated by careless splicing, loss of loop in projection, careless rewinding, bent spools, worn sprockets and a host of other ways, but in every case the mutilation can be prevented by a well-trained operator using a little common sense and a great amount of care.
If a loop is lost in projection the motor must be stopped at once, otherwise the film will be so damaged that a large section may have to be scrapped.
In some cases the film may ride off the sprockets, and if this happens the sprocket-teeth may punch fresh holes between the perforations in the film. Film which has been interpunched in this manner cannot be handled properly by the smoothing system, and results in sound which has a "wavering" quality. Never try to save the show by trying to push the film back onto the sprocket-wheel — save the film instead; stop the motor, reengage the perforations with the sprockets, and then restart. Unless the film is your own, you must put its care before everything else, even if you have to stop the show, but this should never be necessary if you always lace the film correctly and keep your projector spotlessly clean and in good order.
Some film libraries, worried over the amount of mutilation to their films, have introduced a system whereby the intending borrower must first prove that his projector is sufficiently sound and faultless before using their films. For this purpose they are sending out test films which have to be run through the projector and then returned to the library for examination by their experts, who look for scratches and other signs of wear and strain.
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