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1240 HANDBOOK OF PROJECTION FOR
ventilation. This room should be at least six feet wide by eight feet long, with suitable shelving to receive the batteries.
MOTOR GENERATOR ROOM.— In modern practice it is fundamentally essential that there be a well ventilated room adjacent to the main projection room for housing the resistance units or the motor generator, whichever be employed. Here, as in the projection room, construction should be fireproof, and all conduits, et cetera, should be built into the walls, floor and ceiling, not run on the surface. Size will vary greatly with the type of installation. The fundamental requirement is that ample space and light be provided around each unit. In certain types of sound equipment a motor generator unit replaces almost all of the storage batteries. In such cases more motor generator space must be provided, but the battery room can be reduced to a ventilated cabinet in the motor generator room.
WASH ROOM. — It is fundamentally essential, regardless of the type, class or size of theatre, that, adjacent to, and opening directly into, the main projection room there be a room of suitable dimensions equipped with wash basin and toilet, with running water. To this equipment many progressive exhibitors have added a shower bath which, while not a fundamental necessity, is most excellent dividend paying equipment, especially in warmer climates. The wash room is an absolute necessity now that sound film has arrived, because dirty, oily hands are mortal enemies to sound film or disc records.
OBSERVATION PORTS AND FIRE SHUTTERS.
« — The size and position of all ports are matters governed