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crime to compel him to breathe such air. First, there must be vent flue in the ceiHng, or in the wall at ceihng height, leading directly to the open air, and this vent should be of metal, with locked joints. It should have an inside diameter of eighteen inches and should be thoroughly insulated from all wood work, since it is apt to become very hot in case of fire. In this pipe, should be installed an electric fan not less than i8 inches in diameter, so wired that while its speed may be controlled by the projectionist, it cannot be stopped while the projector is running; also the wiring should be so arranged that the dropping of the fire shutters will automatically start the fan going full speed, in case it is running slowly. This latter is of the utmost importance as an adjunct to fireproofing, since in case of fire, unless the smoke and fumes be pumped out, they will or may filter out into the auditorium, where
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Sectional detail of adjustable observation port shutter, with special detail showing construction of channel iron grooves for same.
upon the inevitable cheerful idiot will yell, ''Fire!" and you all know what happens then. Second, there must be one or more fresh air inlets at or near the floor line, leading directly from the outer air. In this connection, I would recommend the Massachusetts law, which requires a fresh air inlet not less than 15 inches long by 3 inches high on each of the four sides of the projection room, same to be located not more than lyi inches above floor line. There should also be an inlet in the center of floor, if possible, otherwise in center of rear wall, not more than 1)4 inches from floor, same to have an area of 160, 200 and 280 square inches, respectively, for one-machine (six feet wide), two
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