Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899)

Page scan 000141 from Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography

Record Details:

Title:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Date:
1899
Publisher:
London Optician & Photographic Trades Review
Volume:
Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography
Leaf #:
000141
Language:
English
Collection:
Books
Format:
Books
Contributor:
Robarts - University of Toronto
Sponsor:
University of Toronto
Coordinator:
Media History Digital Library
Description:
52
Date Added:
July 19, 2022
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PRESENT.DAY APPARATUS. 123 Fig. 132. sufficient time to draw a picture-length down, A simplification of this method is shown in Fig. 133, where two rollers are seen gripping the film between them and thus driving it onward. But it will be noticed that the left-hand roller is not of sufficient size to reach the film except in the part now acting. When this has passed there will vO_ be no grip on the film, which will remain stationary until the pro- jecting part of the left-hand roller again comes round. Naturally this segmental piece exerting pressure on the film is so pro- portioned that its length is exactly equal to one picture. The Biograph works somewhat on this principle, but its details are so complicated that the machine must be described later on as a whole. Ci. Film moved by spring-teeth. In a degree the spring-fork used by Gray in 1895 (Figs. 88 and 89) was the forerunner of the spring- tooth, and in the same moderate degree a resemblance may be traced in the rising wheel governed by a ratchet which was shown in Fig. 129. In that arrangement the tooth acting on the film was able to travel over the film in one direction, and was fixed when moving the other way by the action of a ratchet-tooth, but this ratchet-tooth did not act In the spring-claw, properly Fig. 134 may serve to explain the action, it being understood that this is a double- FiG. 133. directly on the film so-called, it does so.