Principles of cinematography : a handbook of motion picture technology (1953)

Page scan 00054 from Principles of cinematography : a handbook of motion picture technology

Record Details:

Title:
Principles of cinematography : a handbook of motion picture technology
Date:
1953
Publisher:
London : Fountain Press
Volume:
Principles of cinematography : a handbook of motion picture technology
Leaf #:
00054
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
Date Added:
May 15, 2025
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50 PRINCIPLES OF CINEMATOGRAPHY Fig. 14. — Intermittent film claw by W. Darling. Claw Mechanisms One of the first claw mechanisms was used by W. Darling and is seen in Figure 14. The main claw lever 'A' is attached to an eccentric pin *B\ mounted on a rotating disc *C\ A second lever *D' is attached by a universal joint 'E' to the main claw. One end of this lever is guided in a channel 'F' and the other end is attached by an eccentric pin 'G' to a rotating disc *H\ Disc 'H' is arranged to rotate at twice the speed of disc "C and, by this combination, path T" is traced by the claw tips. This mechanism is interesting for two reasons. Firstly, the time taken by the claw to 'pull-down' the film is comparatively short and secondly a mechanism very similar to this is now used in several well known 16-mm projectors. Figure 15 illustrates an early claw used by the Williamson Company and should be mentioned here for two reasons. Firstly, it was an attempt to obtain a straight motion of the claw tips at that section of their path when they were in engagement with the film. Secondly, it forms a link between the earlier mechanisms and many present day intermittents. The action of the claw was as follows: The main claw lever *E' was attached to an eccentric pin *A\ mounted on a continuously rotating disc *B\ A section of the claw lever was shaped to form a segment of a circle and a curved