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

Page scan 000176 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 #:
000176
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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172 PRINCIPLES OF CINEMATOGRAPHY Fig. 70. — Layout of typical projector mechanism. The general mechanical layout of a modern projector is seen in Figure 70 and, although we have not considered the details of sound recording, the sound reproducing head is shown in this figure for the sake of completeness. The upper take-off spool is housed in a fire-proof container having a capacity of 1,000-ft, 2,000-ft or even more. Passing through a safety trap the film is drawn continually under a take-off sprocket, rotating at such a speed that 18-inches (27 -5-cms) of film, or 24 pictures, are fed through the machine every second. Obviously, the actual speed of rotation will depend upon the diameter of the sprocket. Sprocket wheels are designated by the length of film equal to the number of pictures which could be wrapped round the circumference. For example, these sprocket wheels may be 'four-picture', 'six-picture' or 'eight-picture' and will, of course, rotate at speeds of 6, 4 or 3 revolutions per second respectively.