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

Page scan 000146 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 #:
000146
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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128 LIVING PICTURES. C3. Film jnoved by gi^ipping-blocks, etc. Pins and perforations are entirely done away with by the arrangement shown in Fig. 142. Two blocks, M^, may be driven forward to grip the edges of the film against a plate on the other side. The gripping-blocks and plate then sink together, carry- ing the film with them. Flexible guards, M^, prevent the film buckling, and when the pressure of the grippers ceases a brake-pad, O, comes into action and clamps the film while the grippers rise. Fig. 141. Di. Film intermittently struck by revolving eccentric. The original so- called dog - motion invented by Demeny was shown in Fig. 82, and Jenkins' applica- tion of the same is described in connec- tion with Fig. 114. Only one modification needs attention here, and that is a means for varying the extent of stroke. The general principles of all dog-motions are well exemplified in Fig. 143. The film is steadied in front of the aperture by small pressure-rollers and plush pads. The two lower rollers are Fig. J42.