Portable Interlocking Dimmer Board (1930 - 1957)
6 way or 12 way
6 or 12 slider dimmers locally operated by tracker wire from wheeled dimmer handles on top single shaft with master wheel. Fuses, switches and sockets on front face. Fitted with large castors. Originally angle-iron construction and 2-pin sockets. First pre-1930, last 1957. Replaced by PS.8.