215 DYNAMO-ELECTRIC MACHINERY. tufts. In fact, every conducting wire is lines of which can be similarly revealed. To observe them, a hole is bored through surrounded by a sort of magnetic whirl, like that shown in Fig. 9. A great part a card or a piece of glass, and the wire … MAGNETIC FIELD BOUND ONE POLE, END-OX. which carries the current must be passed of the energy of the so-called electric cur- up through the hole. When iron filings , rent in the wire consists in these exter- are dusted into the field they assume the nal magnetic whirls. To set them up Fig.8.…
Engineering
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