Motion picture projection; an elementary text-book (1921)

Record Details:

Title:
Motion picture projection; an elementary text-book
Date:
1921
Publisher:
New York, Theatre Supply Co.
Volume:
Motion picture projection; an elementary text-book
Leaf #:
00074
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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MOTION PICTURE PROJECTION MERCURY ARC RECTIFIERS An apparatus used to change A. C. to D. C. Consists of a glass bulb into which are sealed two iron anodes and one mercury cathode and a small starting electrode. The bulb is filled with mercury vapor. No cur J[ Mercury Arc *| Rectifier -I Connections rent will flow till the starting electrode resistance has been overcome by the conization of the vapor in its neighborhood. To accomplish this, the voltage