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

Page scan 000209 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 #:
000209
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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FILM-MAKING. 191 FlO. 20I. Fig. 202. case rupture of the film is manifestly far more probable. The importance of these considerations is heightened Avhen the question of strain on the film is considered. Tension on the film is shared between the perforations actually engaged with the sprocket-teeth, and it would appear easy to carry the film round the major portion of the sprocket-roller, Fig. 201, in order to subdivide the strain as far as possible. But this can only be done to a limited extent, for not only do various films differ slightly in gauge, but shrinkage in development and even atmospheric in- fluences tend to vary the distance between the per- forations. In fact, in most sprocket machines the film must lie somewhat more loosely in one case than another, according to the greater degree of separation of the per- forations, while inter- changeable sprocket- rollers, Fig. 202, are sometimes provided to suit the special make of film under exhibition. It would seem that shrink- age had much to do with slight differences in perforation gauges, for at first perforating machines were in some instances made to agree with finished films rather than with the Fig. 203.