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

Page scan 000500 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 #:
000500
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 465 cient time for generator voltage to build up before attempting to strike an arc, say 15 seconds from time of starting motor, then bring carbons together, instantly slightly separating them again. As the carbons heat up, gradually separate them until the proper arc length is had, whereupon WIKJN6 D1A6KAM — -DouBi.fr A«EC — Cleveland Ohio U 5 A ro UPPER CRRBQN Figure 152. the voltmeter will show 55 volts, provided the carbons be of correct size and correctly set. Any desired change in amperage, within the range of the machine, may be made by changing the position of the field rheostat regulator, but it must be remembered that the regulator provides means for obtaining amperage in excess of the rated capacity of the machine, which excess should not be used continuously. It is intended only to provide excess current for use where a temporary excess of light is desired by reason of a very dense film, or by reason of heavy tinting. The regulator also provides means for obtaining a less amperage than the rated capacity of the machine. If the projectionist will take advantage of this provision he will not only improve his work, but will also effect a considerable saving in light bills.