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REPRODUCTION IN THE THEATRE BY RCA PHOTOPHONE SYSTEM
John 0. Aalberg*
Perfect sound in a theatre is evidence of a succession of operations excellently done. The first operations have to do with the making of the record and are described elsewhere. The reproduction of the record in the theatre is its presentation to the ultimate auditors and its importance should not be overlooked. Sound apparatus, which must be expertly operated and maintained, has suddenly been added to the projectionists' cares. Some projectionists had the electrical and mechanical ability to cope with the problems that were of that nature but very few had the trained hearing which is necessary to adjust their reproducing systems as to the volume, balance, and allied problems that are essential to producing the real illusion of talking pictures. The training, or self-training, of these men presents a great problem to the industry, and the success of sound pictures depends on it.
Reproduction divides itself into two factors, one pertaining to the physical equipment and the other to the operation of it and handling of the show. All the present producers of commercial sound equipment have standardized their equipment as to speed, position of sound track, and relation of picture aperture to sound aperture so that any record produced can be reproduced on any theatre equipment.
Sound pickup from film is accomplished by adding a sound head to a standard projector (RCA Photophone System). See Figs. 1, 2, and 3.
Such a device has in it mainly the optical system, photocell, constant speed sprocket, and a gate for guiding the film past the reproducing light beam. This beam is located so that the film distance from the picture aperture to it in the direction of film travel is nineteen and a half frames, or pictures. The printing distance between any picture frame and its corresponding sound
* Reproduction Supervisor, R-K-0 Studios.
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