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Stereo cine camera, c 1893.
Detail. This camera (shown without lenses) was patented by Friese-Greene (1855-1921) in 1893 and is based on a similar design by Frederick Varley, patented in 1890. It was manufactured for Friese-Greene by A Lege & Co of London. The film was moved intermittently by a cam-operated rocking roller which pushed the film down one frame at a time. This was effected by turning a handle; as it was turned, cams on the shaft caused the shutters to open when the film was stationary. This was a relatively slow procedure.