A reinforced structure running US-DS on the side of a stage, usually elevated in a gallery, for the purpose of controlling a hemp and sandbag fly system. The operating line is tied off on a belaying pin.
Shown below, on the right (onstage) side of the picture.
http://backstageat.backstagejobs.com/?p=417
Shown below, on the right (onstage) side of the picture.
http://backstageat.backstagejobs.com/?p=417