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THE PROJECTION ROOM 341
Rheostat Room
(48) If rheostats that are not units of the motor generator equipment are employed to control projection current, they should be located in a separate, thoroughly ventilated room adjacent to the main room. (49) This is necessary not only for the comfort and health of the projectionists, but also as a matter of safety. Hot rheostat grids or coils, and inflammable film, are dangerous combinations in the same room.
Motor Generator Room
(50) Motor generator sets should be located in an airy room adjoining the main projection room. There should be sufficient free space around them to enable all necessary work to be carried forward with reasonable convenience. (51) The generator room should be sound-proofed. (52) Never locate storage batteries in the same room with motor generator sets or other electrical equipment.
Battery Room
(53) Storage batteries should be located in a separate room connecting with the projection room. When charging, batteries give off spray that is injurious if breathed in considerable quantities, and likewise does serious damage to the insulation of electrical equipment nearby. This spray must be exhausted to the outer air as fast as it forms.
(54) Wood floors in battery rooms should' be covered with linoleum or painted with an acid-proof paint. Battery acid and spray will rot an unprotected wood floor quickly and may cause accidents.
(55) Storage batteries may be adversely affected by extreme temperatures, either hot or cold. They should never be in the same room with rheostats, nor exposed to low temperatures through improperly placed ventilators.
Projection Room Ventilation
(56) Proper projection room ventilation is important for a number of reasons, each one of which deserves