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 #:
000673
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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MOTION PICTURE PROJECTION 667 source be a mercury arc rectifier or a rotary converter. The cut, Fig. 278, shows how the current varies with arc length on the various types of equipment. The voltage of the arc is shown in the vertical column of figures on the left marked "volts," the arc current is donated above, marked "amperes." It will be noted that the lines all cross at the point 55 volts and 50 amperes. Above this, i. e., at higher volts or greater arc length, curve No. 1 leads rapidly to the left, indicating Fig. 281 fast decreasing current. This corresponds to the performance of the 75 volt machine. Curve No. 2 is more nearly vertical and shows that on the 110 volt machine the regulation is much better, while curve No. 3 approaches closely the vertical line which represents constant current. Curve No. 4, that of the Transverter, shows a slight current climb with increasing voltage, less, however, than the drop when using the 220 constant voltage generator.