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 #:
000669
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 663 Fig. 275 shows the 50 ampere 75 volt capacityoutfit connected to a paralleled two-lamp circuit. Assuming we have lamp No. 1 in use with 50 amperes and a normal 55 volt arc length, the total resistance of this circuit is 75/50, which equals 1.5 ohms. The voltage of the arc is 55, 4 s Z / / ' / ' / / / / / ' / f ' / / / / / / / / / 3 ' / ' / ' / > & ', / ''MG.', -Set ; '',noVoh\ ', Set ', 'ss US/.. <,B f, 'l20Vclt'/ t,JXC\ 'Line' Comparative: Bower. C05T of Propuci/sg A 50 Anpeke Direct Cukeeht Ar.c Fig. 279 leaving 75 less 55, or 20 volts to be lost in the ballast, and with 50 amperes a ballast resistance of 20/50 or 0.4 ohms is required. Now, if we bring the carbons of lamp No. 2 together, as we must to start the second arc, we will be placing the 0.4 ohm resistance of its ballast in parallel