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

Page scan 000370 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 #:
000370
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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THE CALL ANNOUNCER 363 played before the operator. This apparatus, however, was limited in use to circuits of relatively short length. The terminal equipment was expensive and for the smaller suburban offices it could not be "proved in." These objections were not important as long as the use of the call indicator was limited to setting up local calls in city offices. With the growth of the dial system, however, dialing was used to set up connections over longer and longer distances, and it became evident FIG. 1. Call-announcing apparatus with covers removed. At the top can be seen the driving motor and the 8 drums, each bearing 8 strips of film. Associated with each strip of film is an exciting lamp, optical system, and photo-electric cell. that the call indicator would have to be replaced or supplemented by some other type of apparatus which would be generally applicable to the telephone system, of relatively low cost, and which in operation could be adapted to existing practices. It was therefore decided to determine the possibility of translating the pulses of the dial into speech, as such speech could naturally be carried anywhere over the telephone system. After some preliminary investigations, such as a series of measure