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

Page scan 00061 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 #:
00061
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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THE CINEMATOGRAPH CAMERA 57 each side of the film, are engaged with the perforations. These pins are manufactured to very close tolerances and are designed to fit the perforations with great accuracy. Once the pins have entered the perforations they do not move again until the shutter has closed and the exposure is complete. At this stage the pilot pins move backwards away from the film, and at the same instant the claw pins, now in readiness and at the top of their stroke, enter two other perforations at a distance of one picture length below those occupied by the pilot pins. The claw pins also engage one perforation on each side of the film and, by the time they have completed their downward stroke and are about to move out of engagement, the pilot pins have been returned towards the film and are once more about to enter the perforations. At the same instant 'the shutter is about to open and the next frame will be exposed. Whilst the exposure is in progress the claw pins will be completing their cycle by returning towards the top of their stroke in readiness to move the film forward once more. It is very important to note that the claw pins are arranged to engage with the perforations which are exactly one picture length in advance of the perforations occupied by the pilot pins. It will be remembered that film is perforated by a machine which makes Jsnafe 1 & JtaBBB ja ACTION OF THE ACTION OF TKE pilot p:m cam a** cam Fig. 19. — Intermittent mechanism by Mitchell Camera Corp.