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 #:
00081
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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80 MOTION PICTURE PROJECTION wires, and the voltage of one dynamo only when connected between either of the outside wires and the neutral (Fig. 3). No current will flow over the neutral wire, if the system is kept balanced (the same amount of amperage is drawn off either side of the system) and the flow of current in the neutral wire at any time is the difference between the amperage drawn from either side. Fig. 4 shows a three wire system, A and B, being two 110 volt dynamos connected in series, C is the positive wire, D the neutral wire and E the negative wire. The ten circles on either side of the neutral wire represent lamps, each taking one ampere, as we have the same amount of current (10 amperes) r