Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000371 from Journal of the Society of Motion Picture Engineers

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000371
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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364 O. M. GLUNT [J. S. M. P. E. ments on the time duration of spoken digits, work on the first experimental apparatus began in 1927. There had been public showings of sound pictures for almost a year, and the sound picture industry was entering upon a period of intensive growth. For this reason there was available a rapidly growing wealth of sound reproducing apparatus together with experience in its operation. This was of great value in the development of the "call announcer." The first call announcer consisted of a large brass drum with four FIG. 2. Commercial installation of call-announcing apparatus. At the left can be seen the frames carrying the telephone repeaters which form the last stage of amplification, together with other telephone apparatus. teen slots running around it. Over each of these slots was placed a sound film — one for each of the digits, and one for each of the call letters, J, M, R, W. Inside the drum and associated with each of these strips of film was a lamp and a lens system which focused the light from the lamp on the film. After passing through the film, the light was picked up by a photo-electric cell outside the drum. The