Photographer Eadweard Muybridge visits Thomas Alva Edison after demonstrating zoopraxiscopic images, images that follow one another rapidly and leave the impression of movement on the retina. Edison is deeply interested. Within a few weeks, Edison will invent the Kinetograph and the Kinetoscope: “an instrument that does for the eye what the phonograph does for the ear.” Twenty-five exposures per second for twenty-eight minutes, for a total of 42,000 images.
