Pennsylvania Statutes Title 53 P.S. Municipal and Quasi-Municipal Corporations § 24948. Part of stage not used for scenery, etc.

All that portion of the stage not comprised in the working of scenery traps and other mechanical apparatus for the presentation of a scene usually equal to the width of the proscenium opening shall be built of iron or steel beams, filled in between with fireproof material, and all girders for the support of said beams shall be of wrought iron or rolled steel.