Portable Dimmerboard (PS.8 Type)  (1957 - )
Strand

8 ways, either 500/1000 or 1000/2000 watt, variable load
Interlocking with wheel master. Slate 'Sunset' dimmers fitted to each way, except for loads over 1kW when Element type are used. 

Documents

1961 Lighting for Entertainment - page 14 (1961)
From Strand Archive

1963 Lighting for Entertainment page 15 (April 1963)
From Strand Archive

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