F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000233
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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THE PROJECTOR 215 perfectly flat over the aperture during its period of projection, and will, within one ten-thousandth of an inch, occupy precisely the same position occupied by every other photograph of the series. (33) To make the intermittent movement function with such extreme accuracy (33) all vital parts are fitted together with less than 1/10,000 of an inch tolerance of error. Figure 62 In Pig. 62 we have two line drawings of a standard intermittent movement such as is now universally used in modern motion picture projectors. Incidentally, by means of a differently designed .and constructed movement, the Powers intermittent performs precisely the same functions as does the standard type of Geneva movement, though Powers projectors are no longer widely used. (34) Figures 62 and 63 illustrate the standard type of Geneva movement. It consists of a maltese cross of steel, B, commonly referred to as the "star," and steel cam A, upon which is mounted a master pin of steel, D, which drives the "star." This cam also carries a flat circular surface, C, by means of which the star, and therefore the intermittent sprocket which is mounted upon its shaft, are locked immovably while standing still — that is, in the interval the photograph is poised over the aperture and is being projected to the screen.