The phenakistoscope used a spinning disc attached vertically to a
handle. Arrayed around the disc's center were a series of drawings
showing phases of the animation,
and cut through it were a series of equally spaced radial slits. The
user would spin the disc and look through the moving slits at the disc's
reflection in a mirror. The scanning of the slits across the reflected
images kept them from simply blurring together, so that the user would
see a rapid succession of images that appeared to be a single moving
picture.
A variant of it had two discs, one with slits and one with pictures;
this was slightly more unwieldy but needed no mirror. Unlike the zoetrope
and its successors, the phenakistoscope could only practically be used
by one person at a time. The phenakistoscope was only famous for about
two years due to the changing of technology.
Source: http://en.wikipedia.org/wiki/Phenakistoscope
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