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 #:
00033
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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FOR MANAGERS AND OPERATORS 23 Triple pole switches are, of course, used only on the three- wire system. A switch enclosed in a casing of sheet metal is called an "enclosed switch." SWITCHBOARDS. It is not designed to go deeply into this subject, but merely to give you some ideas from which you will be able to trace out ordinary switchboard connections for yourself. In most theaters where there is a switchboard it will be found ar- ranged about as Fig. 8, A or B. ^ A, Fig. 8, is a two-wire board, a-a being the feeding mains, FIG. 6 b-b the fuses, c the main house switch and d-d-d-d-d-d-d-d-d-d the circuit service switches. The two rows of circles are the circuit fuses, being of the "plug" variety, (B, Fig. lo). Look- ing closely you will see screw heads in the face of the bars. These screws indicate the contacts, circuits being run in either direction from each contact. As tothe two-wire board, I do not believe any explanation is necessary; but the three- wire board is more confusing, though it is quite simple after all. Now an examination shows us that the first circuit has contact with the right hand and neutral bars, as has also the next one, which means that these four circuits (there are two circuits to each contact, if all are working) are on one "side." The next two, however, we find to have contact with