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THREE-DIMENSIONAL MOTION PICTURES 159 Chicago. It was procured and mounted on a "Bell & Howell Show-Master projector. The first film-driven polarizer attachment was re- geared to revolve at three times its former speed so as to correspond to the new framing speed of the Morgana movement. Previously while one eye was getting the benefit of three "flicks" the other had to wait through a period of 1/24 second. Now with the Morgana move ment the fluxation of light, with respect to either eye, was uniform. The system which involves shuttling one frame backwards for every two forward, facilitates progression of the film through the projector at stand ard sound speed, and at the same time provides a flicker frequency of 72 frames per second, or 36 frames per second per eye. The polarizer in this case is powered through its gear train direct by the gear mechanism of the projec tor, and not by the film. This change was found to be necessary due to the lack of the film-driven model to stay in exact synchronization at the higher speed re quired with the Morgana movement. The alternate frame principle offers certain advan tages over the split image system. Both the right eye image as well as the left eye image, each occupy a standard full frame on the film. This feature provides for maintaining the quality standard for 16mm projec tion. The alternate frame principle also facilitates pro jection through single undisplaced axis from the pro jector aperture straight to the screen. Because of this feature there exists no requirement to manually register the two images on the screen. Registration, on the other hand is accomplished during the filming or during processing and is accur ately maintained in the film gate aperture of the projector and likewise on the screen. Effects which should result from calculated lateral image displace-