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366 SOUND MOTION PICTURES
many important minds are concentrating on the development of the feature. So far as the projection of "still" pictures is concerned, this can already be accomplished by any one of a great number of devices placed at the eye; for the essential of stereoscopic vision is the existence of two images corresponding to what each eye sees, and the segregation of each image to its proper eye. There have been some claims of stereoscopic features in connection with the introduction of the double-width screen. However, although such screens are of value in reproducing larger images and securing larger area, they do not, up to this writing, include any stereoscopic advantages.
Dr. Herbert E. Ives of the Bell Telephone Laboratories has evolved a plan wherein a spectator at one side of the theatre sees a different side of a certain object than is viewed by another spectator on the opposite side of the room. Thus he gives the illusion of solid objects in space instead of flat images on a flat surface. The apparatus necessary to attain the desired effect, however, is both cumbersome and costly. To obtain the result, projection is placed behind the screen, which is transparent; and the spectator is seated on the opposite side of the screen. Both sides are blanketed with grids of alternate opaque lines and open spaces that pass the light in narrow parallel bands. The projectors behind the screen are arranged in a semicircle. All of them render, simultaneously, views of the same scene taken at one time by a battery of cameras arranged to focus on their objective from different angles. Using the present motion picture camera, it is necessary to take sixty images each from a slightly different angle; the procedure requires fifteen cameras with four moving lenses, each photographing about eighty pictures a second — more than four times the ordinary rate of speed. The sixty images taken are then all condensed upon a single film. Dr. Ives knows that photographers will say that the ob