Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
000509
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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494 CURRENT RECTIFIERS CH. XIII] In order to get good projection when this current supply only is available, a motor-generator set can of course be used, that is, the 25 cycle current is used as power to drive a direct current dynamo (§ 682). The 25 cycle current can be changed to direct current by the use of a rectifier (§ 683). Such current would of course be pulsating although always in the same direction. As the authors have never seen an arc supplied from a rectifier on 2 5 cycle current we can make no recommendation except to examine one of these machines in actual operation. If the arc should prove sufficiently B FlG. 263. OSCILLOGRAMS OF THE POTENTIAL DIFFERENCE BETWEEN THE ANODE AND CATHODE, IN RELATION TO THE IMPRESSED ELECTROMOTIVE FORCE. (Cut loaned by the General Electric Co.; made from the original photograph}. Curve A Potential difference between anode and cathode. Note that during half of the wave this difference is equal to the full impressed (line) voltage while during the other half wave the potential difference increases until the voltage has reached the constant value of 14 volts. When this occurs current is caused to flow through the arc and is used on the direct current side of the rectifier. Curve B Impressed electromotive force, i. e., instantaneous value of the line voltage.