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 #:
00082
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 81 drawn off either side, the system is balanced and there is no flow of current in the neutral wire. The ten amperes being drawn from dynamo A over positive wire C and after passing through the lamps returning to dynamo B by way of negative wire E. An unbalanced three wire system is shown in Fig. 5, taking it for granted that each of the lamps is taking one ampere, we have four amperes on one side and six on the other, 6 — 4 = 2, so our system is unbalanced to the extent of two amperes, and this represents the flow of current in the neutral wire. Four amperes being drawn from dynamo A over positive line C then after passing through the four lamps on the upper side, the four amperes goes to feed four of the lamps on the lower side, but as there I j T \ 0 t o i FIG. b.