gridiron(redirected from gridirons)
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the upper part of a theater stage, circus arena, or film studio shooting area.
Gridirons are used as a place to which to rig pulleys, lifts, and other stage equipment and on which to set up the lighting apparatus. The basic element is a latticed flooring of rectangular wooden beams. The latticed flooring makes it possible to raise or lower props at any spot on the stage. Gridirons communicate conveniently with the area they serve, with the help of work galleries and stationary fireproof fire escapes.