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

Page scan 000119 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 #:
000119
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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84 HANDBOOK OF PROJECTION FOR Wire Systems TWO-WIRE SYSTEM.— The projectionist of today is not likely to come in contact with any except the two and three wire systems. It is true that the "Series Arc System" is still in use for street lighting, but it may be disposed of, so far as the purposes of this work be concerned, with the remark that it is not practical to connect a projection arc lamp to it. Should the projectionist encounter a series arc lighting system the only thing he can do is to let it severely alone. Should he attempt to connect a projection lamp to it, he will most likely put the whole system out of business, and may get himself severely hurt, or even killed. The "Multiple Arc" or "Two Wire System" is illustrated in £ •»••$••$• Figure 9. Fig. 9, in which the heavy lines represent street mains coming directly from the power house, circuits D — D branch mains feeding a district 01 a street, and the thin lines E — E — E house, store, factory, theatre circuits, etc. We see a projection lamp attached to one of these latter circuits, all switches, fuses, etc., being omitted. Assuming the system to be charged with ordinary commercial voltage, we may attach a projection lamp to the wires at