Motion picture handbook; a guide for managers and operators of motion picture theatres (1910)

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
1910
Publisher:
New York : The Moving picture world
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
00022
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
Internet Archive
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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12 MOTION PICTURE HANDBOOK wise there is danger of the heated wires causing fire. A short may be caused by a loose wire swinging against the oppo- site conductor or being carelessly thrown across the two. It may be caused by some poor conductor being laid across the two wires, in which case there will be current leakage until it is removed, and this leakage will represent the same waste as would a ground. As a general proposition, how- ever, a short shows itself immediately and whatever damage is done is almost instantaneous. WIRING. All wires used in inside work, and most of those used for outside as well, are covered with either rubber, gutta-percha or a fibrous covering saturated with an insulating compound. Such wires may touch DRY wood without likelihood of danger but, on general principles, should not be allowed to. Wires should never, under any circumstances, be allowed to come in contact with metal which has any kind of connection with the earth or which reaches (as the iron sheeting of an operating room) from one wire of a circuit to the other. In saying that wires should not be allowed to touch metal the writer is fully aware that modern electrical wiring allows of, in fact, in some cities, requires that wires be encased in metal tubing, both wires of a circuit being FIG 1. placed in the same tube. There are technical reasons why this is not injurious. There are, by the close proximity of the wires to esch other and to the conduit, induced currents vihen alter-