Handbook of projection for theatre managers and motion picture projectionists ([1922])

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
000314
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MANAGERS AND PROJECTIONISTS 279 from outside to outside, and that, except for special cements, film cement will not adhere to emulsion, and will not penetrate it and weld the celluloid beneath — for film cement does not merely stick the surfaces of the film together, but actually welds them, if the cement be a good one. And this is right where the greatest sin is committed in making splices. B 000000000000 00000000000 OiO Figure 79. Either from laziness, carelessness or lack of time to do the job right, or because they fear to break the edge of the film at the sprocket hole, many do not scrape the emulsion off thoroughly, or even do not scrape it off at all around the sprocket holes, RIGHT WHERE THE HEAVIEST STRAIN ON THE SPLICE WILL COME. The inevitable result is that such splices either never are cemented together at their edges, or else very quickly come loose at the sprocket holes, whereupon there is, sooner or later (usually sooner), trouble. SCRAPE TO A STRAIGHT LINE.— Stub end A, Fig. 79, should be scraped to a straight line at the frame line, as per dotted line, and the use of a straight edge is imperative to this end. Too much trouble? Well, if you think so, then you ought not to be allowed to handle film at all. Carelessness in this respect means flashes of white light on the screen. Having scraped the end of the film as directed, apply cement all over the scraped surface of stub end A, but do not smear on too much, because surplus cement is very apt to adhere to the tension shoes and cause trouble. The