Fotoplastikon

The Kaiserpanorama is a form of stereoscopic entertainment medium used chiefly in the 19th and early 20th centuries, a precursor to film, invented by August Fuhrmann. It was patented by the inventor ca. 1890. There would be a number of viewing stations through which people would peer through a pair of lenses showing a number of rotating stereoscopic glass slides. By 1910 he is said to have controlled exhibitions in over 250 branches across Europe, and in the central archive have up to 100,000 slides stored.

Source: Wikipedia