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THREE-DIMENSIONAL MOTION PICTURES over one eye and a green glass over the other eye to obtain the stereoscopic effect." 1 ' Teleview Stereoscopic. Motion Pictures first shown publicly at the Selwyn Theater, New York City, during the holidays of 1922-23. This system uses two' cameras for photographing and two projectors for screening. The spectator is furnished with an instrument to hold in front of the eyes, which consists of a handle, topped with a round section having openings, through which one can view the picture. This instrument contains a shutter synchronized with the two projectors, so that first one and then the other eye is uncovered in agreement with the uncovering of the pictures by the respective projectors. The shutter held by the spectator is electrically connected with the generator that drives the projectors. This all sounds expensive and complicated but in practice it seems quite simple, while the question of expense is debatable. If a house would run stereo scopic pictures regularly, say two pictures a month, and the installation per seat is not over $10, then the cost per seat per day would be only about six cents or per show about one cent each. Over a period of time this would be negligible. PLASTICON PICTURES This is simply an adoption of the Du Hauron Anaglyph. The system was adopted because of its simplicity. The camera pulls down two picture areas at a time and exposes both at once. Each lens is pro vided with a prism so that one lens sees about 1 3-8" to the right of center, while the other sees the same distance to the left. The same camera that is used for color pictures was utilized by making a new mount ing for the prisms and lenses interchangeable with the color lenses. Two exposures are made simul-