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

Page scan 000259 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 #:
000259
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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254 J. O. BAKER AND R. O. DREW [J. S. M. P. E. feet, a photomicrograph was made showing that the film contacts the drum between sprocket-holes and curves away from the drum at the sprocket-holes. Fig. 15 illustrates this effect when only a slight tension is applied to the film. When the tension is increased enough to insure contact at all points of the film, stresses are set up in the film which may be more detrimental to the sound-track and reproduced sound unless the same tension is employed in the recording, FIG. 16. Photomicrograph showing stresses set up in 35-mm film. Tension is increased enough to insure contact at all points of the film. printing, and reproducing processes. Fig. 16 shows the photoelastic effect upon film when under tension. It is apparent that the amount of flexure of the film has a direct bearing upon the quantity of 96-cycle distortion which may be introduced. The larger the radius of the curved surface around which the film is flexed, the less will be the amount of 96-cycle distortion. It is conceivable that a drum of infinite radius might introduce almost negligible 96-cycle distortion. This would point to a skid gate, but here another difficulty would be encountered: namely, uneven film motion due to friction between the film and the gate shoes.