Meadowcroft, Wm. H. (William Henry), b. 1853 · New York & London, Harper & brothers · leaf 43
two electric wires are run from abattery and connected together through someinstrument, this is called a circuit, becausethe electricity has a path in which it cantravel back to the battery. This would bea metallic circuit; but when one wire onlyis used, and the other side of the battery… … V//J Battery Earth nected and will then be able to understandhow a message can be sent. Here we have two sets of telegraph ap- 26 THE TELEGRAPH paratus, one of which, let us say, is in NewYork and the other in Philadelphia. You will see that one wire from the bat-tery is connected with the earth,…
Electricity
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