At the Chicago 1893 World's Columbian Exposition, Muybridge gave a series of lectures on the Science of Animal Locomotion in the Zoopraxographical Hall, built specially for that purpose in the "Midway Plaisance" arm of the exposition. He used his zoopraxiscope to show his moving pictures to a paying public, making the Hall the very first commercial movie theater.
William Kennedy Laurie Dickson, chief engineer with the Edison Laboratories, is credited with the invention of a practicable form of a celluloid strip containing a sequence of images, the basis of a method of photographing and projecting moving images.[citation needed] Celluloid blocks were thinly sliced, then removed with heated pressure plates. After this, they were coated with a photosensitive gelatin emulsion.[citation needed] In 1893 at the Chicago World's Fair, Thomas Edison introduced to the public two pioneering inventions based on this innovation; the Kinetograph, the first practical moving picture camera, and the Kinetoscope. The latter was a cabinet in which a continuous loop of Dickson's celluloid film (powered by an electric motor) was back lit by an incandescent lamp and seen through a magnifying lens. The spectator viewed the image through an eye piece. Kinetoscope parlours were supplied with fifty-foot film snippets photographed by Dickson, in Edison's "Black Maria" studio. These sequences recorded mundane events (such as Fred Ott's Sneeze, 1894) as well as entertainment acts like acrobats, music hall performers and boxing demonstrations.
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