be necessary since the device may be placed on top of the constant supply of batten weight on the arbor, thereby further raising the second platform level. This device has proved completely successful at Temple's Tomlinson Theater, inexpensively and quickly solving an arbor loading problem without reducing the function or capacity of the rigging system, and without any costly structural bUilding renovation.D Exploded View of Arbor Platform Assembly ,/ ./ ,/ ./ / / 1 2 3 4 5 6 7 26 Standard counterweight arbor 2 X 2 X 'I. angle, 13'12" long (4 required) '12" Schedule 40 steel pipe (2 required) '12" Schedule 40 steel pipe spacer, %" long (4 required) '/2-13 X 2'12" H ex head bolt (4 required) '/2-13 Hex head nut and lock washer (4 required) Weld pipe to angle, both sides (Typical 4 places) Theatre Design & Technology US ITT /Spring. 1978