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

Page scan 000372 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 #:
000372
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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. March, 1931] THE CALL ANNOUNCER 365 electrical output of the cell was then passed through a three-stage amplifier associated with it. By means of relays actuated by the dialing pulses the proper film reproducing circuits were connected in the correct order to inform the operator of the number dialed. During the latter part of 1927, the feasibility of the project was demonstrated with this first model, and it was determined to proceed with the work. The question immediately arose as to the compara FIG. 3. Three typical strips of sound film as used on the call-announcer drums slightly enlarged to show the characteristics of the sound track of the recorded characters 1, W, and 9. tive length-of-life of film and disk sound records. The importance of this in a call-announcing mechanism for the telephone system can be readily appreciated from the fact that it must be possible to play the record continuously many thousand times a day over a long period of time with a minimum amount of replacement. Under the conditions met in sound picture projection, neither film nor disk records entirely satisfy this requirement. Disk records would need replacement much more frequently, as would the pick-up