The zoetrope invented in 1834 by William George Horner, was an early form of motion picture projector that consisted of a drum containing a set of still images, that was turned in a circular fashion in order to create the illusion of motion. Horner originally called it the Daedatelum, but Pierre Desvignes, a French inventor, renamed his version of it the zoetrope (from Greek word root zoo for animal life and trope for "things that turn.")
A zoetrope is relatively easy to build. It can be turned at a variable rate to create slow-motion or speeded-up effects. Like other motion simulation devices, the zoetrope depends on the fact that the human retina retains an image for about a tenth-of-a-second so that if a new image appears in that time, the sequence was seem to be uninterrupted and continuous.
It consists of a simple drum with an open top, supported on a central axis. A sequence of hand-drawn pictures on strips of paper are placed around the inner bottom of the drum. Slots are cut at equal distances around the outer surface of the drum, just above where the picture strips were to be positioned.
To create an illusion of motion, the drum is spun; the faster the rate of spin, the smoother the progression of images. A viewer can look through the wall of the zoetrope from any point around it, and see a rapid progression of images. Because of its design, more than one person could use the zoetrope at the same time.
www.zoetrope.com
en.wikipedia.org/wiki/Zoetrope
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