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

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 #:
00088
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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70 LIVING PICTURES. on a pivot (A, Figs. 71 and 72. This arm is periodically tilted by a lever worked by the black cam seen at the bottom of the drawings. In Fig. 71 an exposure has just commenced. The film is held steady by a light gripping frame, and the store reel is occupied in rolling-up the slack portion of film. When this is accomplished the cam causes the rocking-arm to tilt, as seen in Fig. 72, thus drawing a fresh portion of film in front of the lens and then, suddenly returning to its first position, leaves a double loop of slack to be stored away exactly as seen in the preceding figure. A few days afterward Varley filed a specifi- cation showing another means for attaining the same end as that secured by Evans's rocking - arm, namely, causing a loop to be formed in the film by means of intermittent pressure. The film was steadied by the action of two spring- pawls which gripped it against two rollers (A, Fig. 73). By the revolution of a cam, not shown, an arm, B, was periodically thrown forward against the film, of which a sufficiency was driven back between the two rollers, A, to draw an exact picture-length down. The arm then returned to its first position while the store-reel took up the slack so formed. The cam seen in front works a double shutter by means of levers. It was also suggested that light should be allowed to Fig. 73.