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 #:
000505
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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4QO CURRENT RECTIFIERS [Cn. XIII § 683. Mercury arc rectifier. — This is a method of securing direct current from alternating. It is a utilization of the mercury arc, and gives an efficiency of about 70%. The current is slightly FIG. 259 FIG. 260 FIG. 259. MERCURY ARC RECTIFIER, FRONT VIEW. (Cut loaned by the General Electric Co.}. This size is designed for 30 amperes. It requires 14.5 amperes alternating current at 220 volts or 29 amperes at 1 10 volts, and delivers 30 amperes direct current at 62 volts. (See tests § 754). It consumes 2600 watts alternating current and delivers 1860 watts direct current which gives 8,600 candle-power with the projection arc. FIG. 260. MERCURY ARC RECTIFIER, REAR VIEW. (Cut loaned by the General Electric Co.}. This gives a good view of the rectifier bulb and the inductor directly below the rectifier bulb which serves to limit the current in the arc by acting upon the alternating current primary. The iron case on the floor contains a compensating reactance which serves to smooth out the fluctuations on the rectified current.