Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
000686
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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680 MOTION PICTURE PROJECTION When the shorting of the generator is accomplished by closing the switches across the arcs, the current will momentarily increase somewhat above that indicated by the curve, but at no time is the load sufficient to cause the blowing of a fuse. The machine will run indefinitely with switches closed on the short circuiting position, with less load on the A.C. line than if run on open circuit. Fig. 284 2. Upon opening the arc gradually from its normal length to upward of 70 volts, the current increases slightly. This can readily be traced on the curve, the current being the same at 60 and at 120 volts and slightly greater at points between, so that could a single arc be drawn out to 120 volts the current would gradually rise to 109 amperes at 90, then again decrease to normal at 120 volts.