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FunctionA balopticon is an early to mid- twentienth century device that is the transitional form between a magic lantern and a modern overhead projector. It was used for placing objects, such as prints or other opaque images, or transparencies on the balopticon. Then, the image would be projected on a wall or screen for viewing, to trace drawings, or to otherwise copy the image.
Related WorksDavid Robinson, Stephen Herbert, and Richard Crangle (editors), The Encyclopedia of the Magic Lantern, (South Park, U.K.: Magic Lantern Society), 30.