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106 THREE-DIMENSIONAL MOTION PICTURES three standard 35 mm. films. The sight lines of the three lenses converge and cross one another at a point 11/16" in front of them; at this point, a single revolv ing disc shutter is used for all three cameras to assure a perfect synchronization of the exposures. One knob focuses all three lenses at the same time, while another controls the diaphragm apertures. The picture frames used in the camera are half again as high as those of standard height, and since three film strips are used, this means that the total amount of film used is four and one-half times as much as that for a standard 35 mm. motion picture. The equipment for making Cinerama pictures in cludes a sound-recording outfit, which uses six omni directional microphones to pick up all the sound from every angle that exists in the area being photographed, including the sections on either side and also behind the cameras. The sound is recorded on a magnetic type film recorder which requires no laboratory processing and can be played back immediately to check on the quality of the recording. All of the equipment used in photographing the pictures and recording the sound and also the equipment used in editing the picture had to be specially constructed. The sound system is new, however, in that the six sound tracks are magnetically recorded and reproduced by the film method developed by the Hazard Reeves organization which now own Cinerama. Cinerama uses three projectors installed in three projection rooms. One of the projectors, the one in stalled on the west side of the theater, shoots the picture onto the East end of the curved screen. The projector installed on the east side of the theater, shoots the pic- lure onto the west end of the curved screen, the third projector installed directly in front center of the curved screen, takes care of the projected picture located di-