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

Page scan 000327 from Handbook of projection for theatre managers and motion picture projectionists

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 #:
000327
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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292 HANDBOOK OF PROJECTION FOR metal with ordinary peroxide of hydrogen, which may be had at any ten cent store, or at any drug store. MEASURING FILM.— All standard professional projectors made in the United States, or, so far as we know, made anywhere in the Americas, pass exactly one foot of film to each turn of the crank shaft. The number of feet of film in a reel may therefore be measured merely by running it through one of these projectors and counting the number of turns of the crank shaft, which will be equal to the number of feet of film passing through the projector. Thus, if while running a given subject the crank shaft of the projector revolves 980 times, there are just 980 feet of film in that subject. Figure 80-A. There are also several film measuring devices on the market, which may be had of any dealer in motion picture supplies. The way these devices operate is illustrated in Fig. 80-A. A very good makeshift film measurer may be had by disconnecting the intermittent of an old standard projector, using only the upper sprocket. One turn of the crank is then equal to one foot of film.