See the moving p[icture


Demen˙’s Phonoscope

Using Marey’s 1882 fixed-plate chronophotographic camera, Demen˙ photographed himself as he uttered such phrases as “Je vous aime” (“I love you”). He then arranged waxed-paper prints of his image in sequence around the circumference of a metal disk (left), which was placed with a shutter disk in an instrument that Demen˙ called the photophone (center). When the apparatus was placed in front of a light source and the two disks rotated in manner of a phenakistoscope (see Figure 1.6), the viewer beheld simulated motion. In 1892, Demen˙ replaced the metal disk with glass and was able to project animated images by means of a light source placed behind the photoscope box (right). He patented this new invention as the phonoscope. Demen˙ later claimed to have been successful in synchronizing sound by means of a phonograph, but there is no extant evidence to support this claim, which seems doubtful.

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