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

Page scan 000535 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 #:
000535
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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522 C. F. VlLBRANDT Vol 48, No. 6 Relationship between Tension on the Film at the Sprockets and Wear of the Film. — On any projector there are essentially two types of sprockets : (1) Drive sprockets, which pull the film forward against some restraining force or friction. Thus, in effect, the film pulls against FIG. 1. Apparatus for testing number of passages required to cause complete breakdown of film. these sprockets in the direction opposite to that of the movement of the film. Holdback sprockets, which prevent the film from being pulled ahead by the take-up mechanism or some other device. Here the film pulls against the sprocket in the direction of the movement of the film. To test the effect of tension on the wear of film engaging both types of sprockets, the apparatus shown in Fig. 1 was used. The projector (2)