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

Page scan 000142 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 #:
000142
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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124 LIVING PICTURES. ^. action device, one spring-tooth serving to move the fibxi and the other to steady it. H and d are two similar spring frames, but H is fixed while d slides up and down on a bearing, G. As shown, the tooth d^" has just brought the film down and is momentarily at rest in order to steady the film, being pressed home by the stop g. Vw ^W^ ^ K^ Now, when the frame d begins ^ m^ W^ ^^ ^^^^' ^° soon as it is free from the pressure of g, the tooth d^ will have no action on the film, but will drag over it as the spring part d yields a little. The friction of the tooth is pre- vented from shifting the film in the slightest degree by the action of the fixed spring-tooth attached to H. When D has arrived at the top of its stroke and begins its down- ward journey the tooth d^ falls into a film perforation and catches in it, driving the film down. Both the spring-teeth being set in a slightly down- ward sloping direction, the lower moving tooth has no tendency to slip out of the film, while the upper tooth allows the film to pass freely. Fig. 135 shows another arrange- ment of this description. A little frame slides up and down behind the film. On this frame two little pawls, of the shape shown in the right-hand drawing, are pivoted and pass through the frame, being pressed into Fig. 134.