Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
000627
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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MOTION PICTURE PROJECTION 621 is transmitted to take-up sprocket (H), and the sprocket stops revolving. The loop reforms instantly, and roller (A) is forced back into its original position by coil spring (I). Pin (F) immediately re-engages with driving pulley (G), and the take-up sprocket (H) starts to revolve again as a natural consequence. The whole train of operation is automatic — its results instantaneous. FTG. 248 Automatic Loop-Setter POWER'S BALL BEARING TAKE-UP The importance of the take-up device should not be overlooked as its primary function is to make proper compensation for the ever-changing size of the film as it winds up on the reel in the lower magazine. Power's ball bearing take-up has been a part of Power's projectors for a number of years and has proven absolutely dependable and efficient. The take-up consists primarily of two friction discs, which are held in contact by means of a spring. One of these discs is faced with fibre, which assures an excellent f rictional contact. The driving disc (a), is left free to revolve around take-up spindle (b), as an axis. The driven disc