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

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 #:
000563
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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546 STANDARDS ADOPTED [j. s. M. P. E. 5. Motion Picture Projector Sprockets. a. Take-up sprocket The take-up sprocket, which is a hold-back sprocket on a motion picture projector, should be designed to have the same pitch as the perforations on film which has shrunk to the maximum amount occurring in films of commercially useful condition as supplied by exchanges. This value of shrinkage is taken as 1.5%, and the dimensions of the standardized take-up sprocket are computed accordingly. The essential dimensions are: Base diameter 0.9321 inch (23.67 mm.). Tooth thickness (at base) 0.050 inch (1.26 mm.). Other dimensions of the standard take-up sprocket are given in Chart 6. b. Intermittent and feed sprockets The intermittent and feed sprockets should be designed to have the same pitch as the perforations on newly processed film which is 0.13% less than the pitch of newly cut and perforated film (see Charts 1 and 2). The dimensions of the standard intermittent and feed sprockets are computed to conform to these requirements. The essential dimensions are: Base diameter 0.9452 inch (24.01 mm.). Tooth thickness (at base) 0.050 inch (1.26 mm.). Other dimensions of the standard intermittent and feed sprockets are given in Chart 7. 6. Dimensions of Motion Picture Projection Aperture. a. Standard 35 mm. film Width 0.9060 inch (23.01 mm.). Height 0.6795 inch (17.26 mm.). b. Safety standard 28 mm. film Width 0.748 inch (19.00 mm.). Height 0.551 inch (14.00 mm.). 7. External Diameter of Projection Lenses. a. No. 1 projection lens External diameter of lens barrel 2l/& inches (51.59 mm.). b. No. 2 projection lens External diameter of lens barrel 22B/32 inches (70.65 mm.).