Legend has it that the Bingoscope was a poorly designed projector in many respects in that it had no flywheel, no condenser, no shutter thus the hand-cranking was jerky and the light output was wanting. It has a single tooth claw and runs 30ft. cassettes through a book formed gate and whats more the claw was to large for the central 9.5mm perforations. Basically a toy projector in many ways it did improve eventually. There were four models including a 9volt battery model. And a clockwork model.
Pathescope produced 15ft. mini-films which told a little story which were ideal for these projectors. Bing comes from the likely association with the Francis Bing German manufacturer. In Britain they were made by Construment Products. 1937