F. H. Richardson's bluebook of projection (1942)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000312
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:
July 11, 2024
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296 RICHARDSON'S BLUEBOOK OF PROJECTION not yet been described. The intermittent is often called the "heart" of the projector mechanism. In all theatretype projectors built today the intermittent movement is the same in principal and in general type of construction. Differences between various makes and models of intermittens are matters of refinement of design and accuracy of manufacture. (29) The intermittent movement and the rotating shutter are so locked together by a train of gears that the shutter must rotate in exact synchronism, when the intermittent movement acts and by so doing moves the intermittent sprocket precisely one-fourth of a revolution. (30) This cycle of motion displaces one film photograph from the aperture and substitutes the next succeeding one, the whole cycle lasting one twenty-fourth of a second. (31) In other words, it occurs twentyfour times per second, during which each one of twentyfour photographs is successively projected to the screen. (32) The accuracy of the action makes certain that each photograph or "frame" will remain perfectly still and perfectly flat over the aperture during its period of projection, and will, within one ten-thousandth of an inch, Figure 134 occupy precisely the same position occupied by every other photograph of the series. (33) To make the intermittent movement function with such extreme accuracy all vital parts are fitted