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The RGD was a 15 and 30 i.p.s. mono tape recorder[1] present at the BBC Radiophonic Workshop from at least 1962.[2]

It is not the Reflectograph, which ran at 3 to 8 i.p.s.[1].


  1. 1.0 1.1 BBC Monograph no. 51, page 9.
  2. In 1962 she used it for Closed Planet.