Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 553
plied to them from awire, and the current in the wire must come fromsome electrical generator. In almost every casethis generator is a dynamo, though, of course,there are other ways to supply it on a small scale.But, in commercial work, the dynamo is the sourceof electrical supply for all our… … FIG. I. A, B, C. D, ELECTRO-MAGNETS.The arrows indicate the direction in which the current is moving,indicated by N and S. closely than is possible on a casual visit to apower-house. To understand how it operates one has to keepfirmly in mind these three important facts: (i) If you send a current…
Children's literature
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