Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Page scan 000279 from Motion picture handbook; a guide for managers and operators of motion picture theatres

Record Details:

Title:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Date:
[c1916]
Publisher:
New York City, The Moving Picture World
Volume:
Motion picture handbook; a guide for managers and operators of motion picture theatres
Leaf #:
000279
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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260 MOTION PICTURE HANDBOOK However, you must bear in mind that when using an Edison three-wire system you cannot test any apparatus connected only to the neutral wire with a test lamp, because they are permanently grounded with the neutral. In testing with a dry battery it is not necessary to use a bell; just connect two wires to the battery, and make your test. If there Is a ground there will be a spark. It is better, however, to use two or more batteries connected in series. With the insulated three-wire system the test lamp acts the same as with the two-wire system. n Figure 109. Locating a grounded coil in the rheostat is a deep, dense mystery to many operators, but it really is a very simple matter. Fig. 109 is a diagrammatic representation of a rheostat; A, B, C, D, etc., indicating the coils or grids, coil or grid E being grounded to the frame at X. Assuming that we wish to test this rheostat to find out whether or not it is in good order, using a magneto or bell and battery, first touch the binding posts with the two leads from the bell and battery, or magneto. If you get a ring it indicates that the circuit is complete; that is to say, no cojl js broken or