via Ken MacBeth's Photos on Facebook
macbethstudiosystems.com
EVERYTHING SYNTH

'Not only is this one of the earliest forms of electronic sound synthesis, it is noteworthy for being audiovisual in nature - i.e. the composer draws onto a synchronised set of ten 35mm film strips which overlay a series of photo-electric cells, generating electrical charges to control amplitude, timbre, frequency, and duration.This system was a key part of early BBC Radiophonic Workshop practice'. I wrote a post on Daphne Oram's work at Dataisnature in 2008."
via this auction