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THREE-DIMENSIONAL MOTION PICTURES tant role in the viewing of motion pictures, is only part of the over-all reason why such images seem real. Cinerama starts from this basis and, by skillfully com bining other elements of human vision and intricate compensatory optical and mechanical equipment, pro duces a stereoscopic effect in the projected screen picture. The illusion of reality created by the Cinerama process is closely linked to the functions of the retina of the human eye and the drum of the human ear, While a person's attention may be directed primarily at one particular object, his field of vision also encom passes everything on either side of it as far as the cor- ners of the eye can see. Likewise, a man walking down a city street, hears not only the sounds directly in front of him, but also those on either side and behind him as well. Cinerama seeks to attain these effects of real life by surrounding the viewer completely with action and sound. Peripheral vision plays an important part in the total sensation of full dimensional sight. The average range of human vision is 165 degrees horizontally and but 60 degrees vertically. Cinerama closely approxi mates this visual field by reproducing a screen image 346 degrees by 55 dgrees. This screen proportion not only gives the audience an illusion of stereoscopy but also a sense of actually taking part in the action on the motion picture screen. Since no single camera could possibly take in a frac tion of the visual range of the human eye, the Cinerama camera is actually three cameras in one, it weighs 150 pounds has three matched lenses of 27 mm. focal length which are set at angles 48 degrees apart. The matching of the three lenses is all important. Each lens photo graphs one-third of the scenes total width ori one of the