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 #:
000298
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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Nov., 1934] SXROBOSCOPIC-LIGHT PICTURES 289 The drive for the camera was designed with two objects in view: first, to accelerate the film rapidly; and, second, to move the film at a constant speed after the acceleration period. Two motors are used, one being a series motor connected directly to the take-up reel, and the other an induction motor belted to the sprocket shaft. The function of the series motor is to take up the film as it comes from the sprocket, and also to assist the other motor in pulling the moving parts of the camera up to speed quickly. A series motor is especially adapted to drive the take-up reel, because it has a large starting torque and a drooping speed-torque characteristic. The second FIG. 1. Continuously moving-film type of high-speed motion picture camera constructed at the Massachusetts Institute of Technology for use with stroboscopic light. motor is a three-phase induction motor rated at 3600 rpm., */4 hp- It is connected to the sprocket shaft by means of a F-belt, which affords a convenient means of changing the speed by using different pulleys. Experiment shows that when double voltage is applied to both the motors, the film accelerates to a speed of 75 ft. per sec. while 10 feet of film pass through the camera. At that speed the camera takes 1200 35-mm. or 3000 16-mm. frames per second. The film does not slide through a gate or against any stationary part in the camera, because friction at such high speeds would gener-