PRAXINOSCOPE. The praxinoscope, invented in 1877 by the Frenchman Charles Reynaud, was the first device to overcome the picture distortion caused by viewing through moving slots.
a band of pictures is placed inside a shallow outer cylinder, so that each picture is reflected by the inner set of mirrors. The number of mirrors is equal to the number of pictures, and the images of the pictures are viewed in the mirrors. When the outer cylinder rotates, the quick succession of reflected pictures gives the illusion of a moving picture.
source: http://courses.ncssm.edu/gallery/collections/toys/html/exhibit11.htm
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