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 #:
00083
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 are six lamps to feed on the lower side, the two extra amperes are drawn from dynamo B over neutral wire D (which under the circumstances acts as a positive). So in Fig. 5, we have four amperes flowing from dynamo A over positive line C, two amperes flowing from dynamo B over neutral wire D, and six amperes flowing to dynamo B over negative line E. In Fig. 6 we have another unbalanced system, in this case six amperes are drawn from dynamo A over positive line C and after feeding the six lamps on the upper side, four amperes are used to feed the four lamps on the lower side, the two extra amperes going back to dynamo A over the neutral wire D (which now acts as a negative) and four amperes going to dynamo B over negative line E. With a three wire system, the idea is to keep the system as near balanced as possible. For motion picture work it is advisable to connect the machines between the neutral wire and the outside, one machine on each side of the system. When using the positive and neutral wires, the positive goes to the top jaw of arc lamp and the neutral to the lower, if you use the neutral and negative wires then the neutral wire goes to top jaw of arc lamp and the negative to the lower.