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 #:
000308
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 273 loose splice is likely to catch on a sprocket idler and split anywhere from one to four feet of film before the projector can be stopped, especially in houses where the projectionist is obliged to rewind and do other chores while his projectors are running the show. Splices in which sprocket holes are not properly matched are likely to clamp the sprocket teeth, thus causing a jump in the picture and perhaps the loss of a loop, or they may grip the teeth of the sprocket and wrap around it, particularly if the sprocket teeth be under cut or somewhat hooked. Split sprocket holes will ofttimes catch on a sprocket idler, and a section of the edge of the film will split off, even if nothing worse occurs. EMULSION DEPOSIT. — Much damage is done to first run film by means of emulsion deposit (see general instruction No. 10, Page 604). This trouble is greatly aggravated if the projectionist carries too tight a gate tension. In fact there are numberless ways in which film may receive damage. It is a fragile product, Figure 77B and a product which must be in absolutely perfect condition if there is to be a perfect picture on the screen. FILM WAXER. — When using first run films upon which the emulsion is soft there is always the inclination of emulsion to rub off and deposit on the tension shoes or springs. The best method of preventing this is to place a small amount of suitable wax on the sprocket hole tracks.