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 #:
00043
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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FOk MANAGERS AND OPERATORS 33 ried by the mains. Thus, if you find the lamps are 110-volt and there are two in series multiply 110 by 2. If there are five SO-volt lamps in a series multiply 50 by 5 for the line voltage, ntiM etc. You may attach a projection arc lamp, as shown, by pro- viding rheostat resistance according to the line voltage. SERIES MULTIPLE. The series multiple system is a very bad form of wiring and is so little in use that it is hardly worth while describing. A projection arc lamp may easily be connected to it. HIGH POTENTIAL ALTERNATING SYSTEM. The high potential system is a two-wire system, in effect the same as the multiple arc system. It is always alternating and the mains carry pressure from 2,000 to as high as 20,000 volts, usually about 2,000, however. With the mains we have nothing at all to do, since they must be handled only by an expert elec- trician. Never attempt to touch, handle or meddle in any way with the mains of a high tension system, unless you hanker to reach the hereafter by a very expeditious route. In this system there is what is called a "primary" and a "secondary" current. The current on the mains is high tension, but is, by means of a transformer (Fig. 15), reduced for com- mercial use, usually to 110 volts. The secondary current is taken from the secondary coils of the transformer on two-wire service circuits, which are the same as the multiple arc system (Fig. 12), and your connections are made exactly the same as directed for that system. A full explanation of the transformer will be