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

Page scan 00065 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 #:
00065
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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62 HOLM AND KAYLOR July threading the film in the adapter. When in operating position, the sprockets are locked in contact with the guide rollers. As is customary, only the take-up reels are driven. The supply reels are rotated by removal of the film, and since the speed of the take-up reel varies with the amount of film wound on the reel, a clutch is needed between the driving power and the reel to allow for overdriving, and to compensate for possible differences in length between two rolls of negative film. Fig. 4 A clutching device was desired which would not be too bulky, and would not overhang the camera outside the magazine. It was also desired that the clutch should not be completely enclosed within the magazine, thus making it impossible to adjust without opening the magazine. A pair of single-disk clutches within the take-up spool, arranged coaxially on the same shaft, was designed to meet these requirements. Ball-bearing surfaces reduce friction and increase the life of the drive.