Named after its creator Daphne Oram, this early sequencer uses a set of 10 ganged 35mm film loops running over photo-electric cells to produce sound. Tones were produced by hand painting forms to control frequency, duration, amplitude, timbre, etc.
It’s doubtful whether anyone other than Oram every mastered the device, but in addition to her own experiments and compositions, she wrote (painted?) music on the machine for commercials (Lego and Heinz) as well as the soundtrack to The Innocents, 1961’s creepily effective adaptation of Henry James’ The Turn of the Screw.
The machine was the result of engineer Oram’s after-hours tinkering at the BBC, where she eventually succeeded in efforts to create an electronic sound lab. The fruits of the Radiophonic Workshop she founded are familiar to Dr. Who fans who would remember artist Delia Derbyshire sound effects and rendering of the show’s theme song.