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 #:
00041
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 31 A twenty-lamp circuit would have about 1,000 volts pressure. Each lamp must carry the entire pressure and all the current, which latter seldom exceeds ten amperes. You cannot connect a projection arc lamp to this system under any circumstances. Fig. 12 is a diagram of the multiple arc system of wiring, illustrating the method of connecting a projection lamp thereto. You may connect in anywhere, simply attaching one wire to one wire of the light circuit and the other wire to the opposite, being sure that the wires, switches, fuses, meters, etc., are large enougn to carry your current. Before connecting ascertain the voltage of course, and arrange the amount of your rheostat resistance accordingly. In practice lamps are not usually attached between 1.27y>^i»o J, , /!l\.tosid.i 3 ■ /4m p.. riGi2. u the main wires, as is shown in the illustration. Light circuits are run from the mains, as shown, and are called "service circuits." 2 ■ /»c«.nde5Cff/it Circalt i, I /f (l t Off i t s FID 13 Fig. 13 shows the three-wire system, which is used mainly for direct current. In this system two dynamos are run in series, producing a pressure across the outer wires of 220 volts (usually) or a pressure of 110 volts between cither the outer and center