ABSTRACT
From the beginning of photography it must have struck many of those who were acqainted with the phenomenon illustrated by the phenakitiscope invented by Plateau. The photography could produce with advantage the series of pictures used in that instrument, on account of their possessing a greater degree of accuracy than when made by hand. If a number of binocular photographic pictures were taken of a machine in various consecutive stages of its motion, these pictures, applied to a phenakitiscope, would give a complete illusion of the machine in perfect relief and in its full action. By moving the slide one way the right eye can see the picture representing the figure in one position, and the picture showing the other position is invisible to the left eye. Now, by moving the slide the other way the left eye sees the figure in the second position, and the first position is invisible to the right eye.
