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1242 HANDBOOK OF PROJECTION FOR
the spot-lamps, stereopticon and effect projectors this direct connection may not be practical, but for the motion picture projectors and the flood-lights it is absolutely necessary. The room ventilation system should be capable of making a complete change of air in three minutes. The lamphouse ventilation system should be capable of keeping the temperature of the air in the vent pipe eight inches above the top of the lamphouse at not more than 350° F.
It is very doubtful if, for taking care of the fumes from a film fire, it would be unreasonable to recommend a system having a capacity of 5,000 cubic feet per minute. It should be capable of maintaing the barometric pressure in the projection room during the fire substantially below that of the auditorium so that none of the inevitable crevices will exude any traces of smoke or flame.
Your committee realizes that this section of the report is far from complete, and intends to go more thoroughly into the matter of ventilation in the time between now and the next meeting of the Society, treating the matter somewhat in the manner of stack loss problems in power plant engineering.
Now, after all bare physical fundamental requirements have been taken care of, there still remains a vitally important one which is often overlooked, though it is just as fundamental as those of a more definite nature. The audience sees the picture and other projected effects seated amid the most finished and luxurious surroundings that architects and artists can create. Now if the projectionist views the same picture and effects framed by a dirty, oil spattered unplastered wall festooned with a serpentine maze of conduit, etcetera, can his mental attitude be the same, can his standards of judgment be as high as