Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
00038
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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32 MOTION PICTURE PROJECTION which part of the circuit the current is interrupted. The flow of current will stop whether the break is made at the lamp, or in one wire at some distance from the lamp, or by opening a switch at the switchboard at the central station. Electricity must then be regarded as flowing in every part of the circuit, so that electricity is leaving the battery or dynamo at one side and going back to it at the other side. Current. — The current flowing in a circuit is no stronger at one point of the circuit than at another. This can be proved by connecting a measuring instrument called an ammeter into tAHP Fig. 2 the circuit at different points, a, b, or c, Fig. 2. It is found to register the same at whatever point this test is made. A useful illustration of the electric circuit is a closed circuit of pipe (Fig. 3) completely filled with water and provided with a pump, P, or some other device for causing the water to circulate. The amount of water which leaves a given point in each second is just the same as the amount which arrives in the same length of time. Now in the electric circuit we have no material fluid, but we suppose that there exists a substance, which we call electricity.