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bur-Track Magnetic Theater Sound Reproducer •r Composite Films
S. W. ATHEY, WILLY BORBERG and R. A. WHITE
A four-track, magnetic sound reproducer which mounts between the upper magazine and the picture mechanism of a standard theater projector is described. Features include: minimum increase in overall projector height, no interference with normal projector operation and excellent film motion. The use of this unit for the initial experimental recording work which produced the first composite CinemaScope film demonstrations is also described.
N THE EARLY PART of 1953, the Twentieth Century-Fox Film Corp. demonstrated the wide-screen motion-picture process now known as CinemaScope to motion-picture industry groups, and asked the equipment suppliers of the industry to attempt the development of methods for carrying a stereophonic sound record on the same release film with the picture.
In response to this request the equipment described here was developed in two overlapping stages: (1) the development of a practical method of recording and reproducing stereophonic sound on a single 35mm film, which would at the same time leave the maximum amount of space available for the CinemaScope picture; and (2)
Presented on October 6, 1953, at the Society's Convention at New York by S. W. Athey (who read the paper), Willy Borberg and R. A. White, General Precision Laboratory Inc., Pleasantville, N.Y. (This paper was received Jan. 12, 1954.)
the commercial development of theater equipment for reproducing such a stereophonic sound record.
Twentieth Century-Fox originally proposed that sound be carried on three 50-mil magnetic stripes applied adjacent to the sprocket holes of standard 35mm film. This proposal was modified in many ways during the months that followed, but eventually became the basis of the final commercial-release version of CinemaScope film. The sprocket holes were narrowed, and the space made available by this change was used to add a fourth "effects" or "audience surround" track and to widen the three main tracks to 63 mils; otherwise the original proposal was retained. The final release-print standards were established by Twentieth Century-Fox on the basis of information and reports of progress transmitted to them by this company and others working simultaneously on the same problem. A drawing of the releaseprint picture and sound-track locations
March 1954 Journal of the SMPTE Vol. 62
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