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 #:
00044
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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34 MOTION PICTURE.HANDBOOK given under the head of "Resistance Devices" further on, but for the benefit of road operators and showmen the following instruc- tions are given: Fig. 15 shows a transformer attached to a pole. That is where \ iJ - .r / A I 2? Fig. 15. you will usually find them. 1—1 are the high tension wires, which you must, on no account, touch since they will probably be charged with a pressure of at least 2,000 volts. 2—2 are the secondary wires, carrying usually 110 volts, to which you may attach your arc lamp wires. A—A are the fuse boxes, some- times set in the sides of the transformer and sometimes, as in this case, isolated. The fuses are carried in iron plugs, which may be pulled or screwed out. For ordinary service circuits these fuses will be very small. The reason is this: they carry high tension current, being located between the mains and the transformer. One ampere of current at 2,000 volts becomes about 10 amperes after it is reduced to 110 volts pressure, so that a three-ampere transformer fuse on a 2-000-voIt system will carry what will become 30 amperes at 110 volts after passing through the transformer. In many places it will be found that the wires entering the building (ofttimes a church) where the show is to be given are not large enough to carry projection