Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
000116
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 115 feeds the film to the lower reel 0. Because of the increasing diameter of the roll of film due to winding the film on reel 0, the velocity of rotation of 0 must be allowed to vary; this is accomplished by means of the belt drive P, the belt permitting slippage below the maximum speed. It should be carefully noted that the total revolutions made by each of the three sprockets E, I, and M, is the same, the only difference being that the motion of E and M is constant while that of I is intermittent.