Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000369
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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350 MOTION PICTURE HANDBOOK transformer or auto transformer. This is done in different ways. In some cases the turns in the primary are changed, and in this way the reactance, or magnetic choking, is changed so as to change the value of current at the arc. This fact is taken advantage of as per Fig. 161, in which A, B, C are buttons and D ,a lever which completes the circuit of the primary coil through one of these buttons. It will readily be seen that if lever D be on button A the number of turns in the primary will be decreased, and, since the turns in the secondary remain fixed, the voltage of the secondary and consequently its amperage will be raised. By moving lever D to button B or C the number of turns in the primary is increased, and, therefore, the voltage and amperage in the secondary is decreased. Another scheme, used in the Fort Wayne A. C. compensarc, is to have small additional reactance coils, which are cut in or cut out of circuit by means of a switch. These are placed in the secondary circuit, so that the secondary voltage Figure 162. remains the same for the different values of current, and this gives the same length of arc and condition of the crater on the different steps. See Fig. 162.