Richardson's handbook of projection (1930)

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MANAGERS AND PROJECTIONISTS 1239 two things which no theatre can afford to have happen to its projection staff. CONDUITS, OUTLETS AND ANCHORS.— In the modern projection room there is the necessity for so many electrical circuits that it is both unsightly and highly impractical to run the conduits on the surface. They must be built into the walls, floor and ceiling. It is also essential that all electrical outlet boxes, ventilation ducts, anchor bolts, etcetera, be exactly located prior to the construction of the room, and that the faces of all outlets be located flush with the surface except in special cases where there is good reason for doing otherwise. REWIND ROOM. — This room is for storing, rewinding, inspecting, repairing and assembling film. It should open directly into the main projection room, and if possible into the screening room as well. Every possible precaution in design, finish, equipment and ventilation to make this room clean and dust-free is justifiable when one considers the delicate nature of the sound track on modern sound film. Size wrill vary with conditions, but your committee regards ten feet by twelve feet as representing the minimum acceptable dimensions unless storage cabinets for film and records are built into the walls of the room. BATTERY ROOM.— If battery operated sound synchronizing equipment is to be installed there must be a throughly ventilated room sufficiently large to accommodate these batteries and their charging equipment conveniently adjacent to the main projection room. Batteries, in charging, give off gas and vapors which are inflammable and have a corrosive action on human tissues and on most metals. Hence the absolute necessity for