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Handbook of projection for theatre managers and motion picture projectionists ([1922])

Page scan 000124 from Handbook of projection for theatre managers and motion picture projectionists

Record Details:

Title:
Handbook of projection for theatre managers and motion picture projectionists
Date:
[1922]
Publisher:
New York, Chalmers
Volume:
Handbook of projection for theatre managers and motion picture projectionists
Leaf #:
000124
Language:
English
Collection:
Books
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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MANAGERS AND PROJECTIONISTS 89 If, however, an economizer, a mercury arc rectifier or a motor generator set be used for voltage reduction, then there is large advantage in connecting to the two outer wires, since there would then be no unbalancing effect and the total energy taken from the lines would be practically the same as when connected to one side at 110 volts. It may be accepted as fact that, If the line voltage be reduced by means of a. rheostat, the power company can have no reasonable excuse for compelling you to attach your projection arc to the outside wires of a three-wire system. Such a connection would cost exactly twice as much for electrical energy to operate the arc as it would cost if you were connected to one side at 110 volts, and places double the load on the system. But to return to the consideration of_Fig. 10, we have seen that with lamps K, L, M and N burning the system is balanced and no' current flows back to the generator over neutral wire D. Let us now turn on lamp J in addition to lamps K, L, M and N. This will cause \y2 amperes to be generated, which will flow out on wire E to the point where lamp J is connected, whereupon it will divide up as shown, y2 ampere passing through lamp J, Yz through lamp K and Y2 through lamp L. Between wires D and F y2 ampere will flow through lamp N and Yz through lamp M, but there is no lamp to balance lamp J, therefore the current flowing through it must return to the generator over neutral wire C. Hence we now C JOflMP. Figure 11.