A cabinet-like apparatus, forerunner of the motion-picture film projector, developed in 1891 by American inventor Thomas Alva Edison and his assistant and protégé, William K. L. Dickson. When a nickel was dropped into its slot, celluloid film (recorded in the Kinetograph) would roll through the Kinetoscope, passing between a lens and an electric light bulb (another of Edison’s inventions). A peephole at the top of the Kinetoscope allowed people to view moving pictures as the celluloid rolled past.