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neglect, rust, dirt, frost, snow or expansion by heat or warping of framework. If glass is used it shall be protected against falling on the stage by a wire screen so arranged that if clogged the effective area will not be reduced or the operating mechanism interfered with. Automatic fusible links shall be used to open the damper or sash in case of fire in addition to manual control provided by a cord run to point on the stage designated by the superintendent.
Section 17. Protection of Stage
There shall be a standard wet pipe system of automatic sprinklers controlling the entire theatre except the auditorium, lobbies and foyers. Sprinkler openings shall be placed around the proscenium opening in back of the curtain so as to form a water curtain when they are opened. There shall be a standard system of standpipes with two 2^-inch diameter outlets at each level of the auditorium and at stage level. Also one outlet at each dressingroom level and gridiron. Each outlet shall be provided with a sufficient length of 1^-inch hose so as to reach all parts of the tier which it controls. There shall be a full equipment of axes, hooks, chemical fire extinguishers and water barrels placed in various parts of the stage to combat the spread of fire. All stage scenery, curtains and decorations made of combustible material shall be painted with a non-combustible material.
Section 18. Lighting
Electric light only shall be permitted on the auditorium and stage portions except that gas light may be used to indicate exits. If exits are indicated by electric Hght, this service shall have a separate control and be connected ahead of the main service. Section 19. Boiler Rooms and Carpenter Shop.
Boiler rooms, carpenter or scenery painting shops shall be separated from the auditorium and stage by a fireproof floor or masonry wall or both, and have automatic fire doors in the connecting openings.
Section 20. Stage Floors
The gridiron shall have a metal lattice floor designed to carry a live load of 75 pounds per sq. ft. Fly galleries shall be of fireproof construction designed to carry 90 pounds per sq. ft. All of the stage except the part usually covered by floor traps of no greater width than the proscenium opening and depth from proscenium to rear wall shall be of fireproof construction. The non-fireproof part shall be of heavy timber or steel beam construction. All shall be designed to carry at least 100 pounds live load per sq. ft. Section 21. Projection Room
Every projection room shall be large enough to permit the projectionist to walk freely on three sides of the machine. Walls shall be of concrete or tile at least 4 inches thick and all doors leading from the room to be self-closing fire doors. Openings for picture projection shall be protected with heavy sheet metal drops arranged to slide in grooves. They shall be controlled by cords arranged in
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