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

Page scan 000427 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 #:
000427
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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420 L. A. ELMER [J. S. M. P. Ei which partially counterbalance the weight of the film, reel or ph friction drum. etc. The friction drag of the supply reel is caused the weight of the film, reel, lever, and film tension pressing the against the brake shoe. The characteristics will be determine for such a rewinder when the film is fed (1) downward from the supph reel, (2) upward, and (3) horizontally. In the last two cases, th< film would be fed over suitable rollers not shown in Fig. 1. BRAKE DRUM FIG. 2. Diagram of preferred arrangement of rewind machine (Case 2). The following notation will be used : L = the desired load on the brake shoe due to the weight of the film, reel lever, and pull of the film (latter may be positive, negative, or zero) n — coefficient of friction between drum and brake shoe. P = tension in the film between reels at any instant. Po = pull of the film when the supply reel is nearly empty. Pi = pull of the film when the supply reel is nearly full. W = weight of the empty reel (or plates and core), drum, and lever reaction Wo = the portion of W required to give the desired film tension. w = weight of the film on the supply reel at any instant. wi = weight of 2000 feet of film = 8.44 pounds. = radius of friction drum. = radius to outside of supply reel film at any instant. = radius to outside of take-up reel film at any instant. r R Rt