St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 77
l go out of their way to go throughiron. With a coil of wire the lines of force pass from itsN pole through the air on all sides of the coil to its Spole; they then pass through the inside of the coil andthrough the air back to the N pole. When the resist-ance to their passage through the coil is… … Fig. 94. MAGNETIC EFFECTS OF EIvECTRIC CURRENT. 75 a core. (See Study, Chapter XXII., for experi-ments.) 97. Forms of Electromagnets. Fig. 95 shows astraight, or bar elenromagnet. Fig. 96 shows a simpleform of horseshoe eleHromagnet. As this form is not easilywound, the coils are generally wound on…
Electricity
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