Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000132
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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1056 HANDBOOK OF PROJECTION FOR there would be more film between the two points. On the other hand, if they be made smaller, there would be less film. Examining Fig. 393, which is the film as threaded into a Western Electric sound attachment mounted upon a Simplex projector, you will see that if loops A or C be made either larger or smaller, then the amount of film between the two apertures would be altered. Western Electric employs two loops, namely, loop A, Fig. 393, and loop C, Fig. 393. Loop C is made by setting loop A exactly the right size, which is gauged by its relation to the lower fire shield, as shown in Fig. 393, then stretching the film down through the opened sound gate and down past the sound sprocket tightly, and then slacking up exactly two sprocket holes, attaching it to the sound sprocket, closing the sound gate idler and the sound gate itself. Different procedure is followed in this respect with different makes of apparatus. Some have no loop C at all. Whatever the procedure, however, the setting of the lower loop (loop A, Fig. 393) exactly the right size is of extreme importance. Your operating instruction book and the installation engineers will advise you just how to do it. My chief concern is to impress upon you the necessity for the utmost possible exactitude in following those instructions. Even so little as one sprocket hole "out" in the matter of setting the lower loop will injure the result in synchronism.