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

Page scan 000272 from Motion picture projection; an elementary text-book

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 #:
000272
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION 271 In changing the speed, the idler pulley moves with the tension spring F-119-X, and adjusts the belt so that no matter what speed is required, the belt adjusts itself to requirements. THREADING SIMPLEX To thread the film through the Simplex head, open up film rollers A and D, Plate 1, open gate by pressing plunger B; now draw out of upper magazine through magazine valve about three feet of film, pass film under top feed sprocket and close film roller A, thread through gate, making sure that the film is riding on runners; engage film on teeth of intermittent sprocket, then close gate by tripping catch C ; next pass film over lower feed sprocket and close film rollers D, thread through the lower magazine valve and engage on clip on lower reel. Care must be taken to see that a loop of film is formed between the upper sprocket and gate, and between the intermittent and lower sprocket. BEFORE STARTING YOUR SHOW See that— Carbons are long enough to last through the picture. Lamphouse is free from grounds. All electrical c'onnections are tight. Arc is not burning upside down. The light spot is focused on aperture in gate. Projector is oiled, intermittent bath is full, grease cups are filled and are feeding. Magazines are lined up with mechanism, so that film travels in a straight path from top to lower magazine.