Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Page scan 000341 from Motion picture handbook; a guide for managers and operators of motion picture theatres

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000341
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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322 MOTION PICTURE HANDBOOK Resistance as Applied to the Projection Circuit RESISTANCE as applied to the projection circuit is no different in principle from resistance applied to any other circuit, but it will, nevertheless, I think, be advisable to give somewhat extended explanation of various points, since the element of variable resistance enters very largely into the matter. As a rule the voltage of the supply is a fixed quantity, which may be anything from 60 volts to, in extreme cases, 500, but ordinarily is either 60, 70, 110, or 220. The requisite amperage is an extremely variable quantity, ranging from as low as . 12 for stereopticon projection to, in extreme cases, as high as 80, or even 90 in the projection of moving pictures. As a general proposition, however, amperage requirement for moving picture projection will range from 25 to 50 D. C, and from 40 to 60 A. C, though much more than 60 amperes A. C. ought ordinarially to be used. Figure 142. Now with a fixed voltage, 100 for example, the amperage will depend upon the resistance encountered. Having first carefully read and considered the text matter under "Resistance," Page 34, let us examine the resistance of the projection circuit, laying aside, however, the resistance of the line and carbons, which is, in itself, a small quantity, usually ignored when figuring projection circuit resistance.