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THREE-DIMENSIONAL MOTION PICTURES 109 lions from the curved surface at one end of the screen, were caught and visible on the curved portion of the screen at the other end. Another problem that had to be overcome. As three projectors were used, three distinct pictures were projected onto the screen,, each of the projectors taking care of one-third of the picture, these three pictures had to be "blended" so that the dividing lines between the pictures were not visible to the audience. The pictures thus had to overlap, but this increased the lighting of the overlapped portion. To overcome this difficulty a saw-toothed attachment that oscillates in the light beam at the gate aperture at the extreme edges of the pic ture was installed, this cuts down the light approxi mately 50 per cent at the edges, so that the overlap on the screen appears uniformly lighted with respect to the rest of the projected picture. The projectors were built by Century, each pro jector fills 48 degrees or one-third of the screen. The lenses are matched lenses as to magnification, and other optical requirements. The sprockets on the projector are oversize, and the intermittent sprocket engages in six of the film sprocket holes as against four in standard projection. The film runs at 26 frames per second, it is standard 35 mm. stock with a six hole sprocket frame. The frame is one inch by one and one-eighth inch. The film is edge-guided in the projector to help avoid jump and weave in the projected picture. The film is edge numbered from the "start" mark. So that in case of film break in any one of the projectors or a break in the soundhead, the projectionist on the machine where the break occurs, threads up on any frame with an edge number and reports this number to the console operator, who passes word to the other two projection ists, who roll their individual machines to that same