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THE PROJECTOR
a poor film splice in the loop— evidence that something
requires immediate attention.
If it becomes necessary to remove and replace a lateral guide follow the manufacturer's instruction hook, or if this is unavailable secure detailed instructions by add: ing the projector manufacturer. Correct placement of the lateral guides is necessary to good projection.
The Automatic Fire Shutter
All projectors are equipped with an automatic fire shutter (122) consisting of a mechanically controlled sheet of metal that drops down, automatically, between the cooling plate and aperture, cutting off all light from the film and the screen the instant projection speed is reduced below the safe limit, which is the moment the film is in danger of ignition because of the slowness of its passage through the intense heat of the spot.
(123) The mechanical operation of the fire shutter varies widely in different makes of projector, but in none of them does it require much attention beyond lubrication. (124) The fire shutter should not rise until projection speed has fallen to at least sixty (60) feet of film per minute. It should drop automatically when projection speed falls below sixty feet of film per minute. (125) Projectionists should check the rising and falling speeds of the shutter at least twice a week to make sure the device is operating properly. Improper action of the fire shutter is a decidedly dangerous condition, especially in one-man rooms.
Size of Loops
(126) Between the upper and lower loops in the projector mechanism the film moves intermittently exactly three-quarters of an inch each time. Both loops must therefore contain that amount of slack film, and a little more. (127) To arrive at the required loop size, thread in a film and operate the mechanism slowly by means of the flywheel; watch the loop action and gradually diminish the loop length until it has just the amount of slack