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machine (nine feet wide) or three-machine (12 feet wide) room. The same law requires a twelve, sixteen, or eighteen-inch vent pipe, respectively, and fan for different size rooms, but with this I am unable to agree, since a burning film will make just as much smoke and fumes in a small room as in a large one. Eighteen inches should, in my opinion, be the absolute minimum diameter for projection room vent flues. Third, all lens and observation ports should be covered with glass in order to prevent the pulling in of foul air from the auditorium as well as to prevent smoke entering the auditorium in case of fire. The inlet fresh air ports should be provided with shutters, arranged to automatically close in case of fire, when the port shutters are dropped. The dropping of these shutters will compel the exhaust fan to suck air in around the cracks of the port shutters and door, thus preventing any smoke from seeping out.
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Showing elevation of adjustable shutter, and detail of its relation to the regular port fire shutter.
Sanitation: It is absolutely essential that the projection room be applied with toilet facilities. This is so obvious that argument should be and is, I think, unnecessary. There should also be a wash bowl, with running water. The projectionist's hands become soiled with oil and carbon dust, and it is better to wash this off with water than to wipe it off on films worth $125.00 per reel — yes, quite considerably better.
Observation and Other Ports: This is an extremely important item, and one subject to great abuse. It is utterly absurd to expect a projectionist to put on a high-class reproduction of a photoplay if he must squint at it through a sort of glorified knot hole. // is absolutely essential to high-class projection that the observation port be of size sufficient to allow the projectionist a full view of his entire screen from ordinary projection position. The position of the observation port as to height from the floor will depend, of course, upon projection pitch. I have always
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