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

Page scan 00039 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 #:
00039
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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32 M. G. TOWNSLEY Vol 43, No. 1 Various projectors locate the film differently in the gate. This makes the film of maximum value only for the projector which locates from the same perforation as is used to locate in perforating the steadiness pattern. In the Bell and Howell projector, the film is located from the perforation at the upper corner of the aperture. The present film is made to locate from this same perforation. If the film is used in any other projector, the inherent steadiness of the film FIG. 2. Bell and Howell film perforator modified to feed one frame at a time. will be no better than the combination of the errors of original perforation and steadiness perforation will permit. As a part of the title which appears in each frame are lines which tie together the two perforations in each frame which were punched at the same time and the film perforation from which they were located. As seen on the screen, these are the center and lower steadiness perforations and the lower left corner film perforation. Current projector specifications call for steadiness tolerances of from 0.2 to 0.3 per cent of the picture width. Careful workmanship