Lynde, Carleton John, b. 1872 · New York : Macmillan · leaf 190
are called permanent magnets.An electromagnet consists of a core of soft iron magnetized byan electric current. It is a magnet only when the current isflowing. Of the two, th electromagnet is the more important. Fig. 121.—The mariners compass. The Electromagnet Oersteds discovery. — In 1819 a Dane… … Fig. 122.—Oersteds experiment. because it showed for the first time that there is a relation be-tween electricity and magnetism.If the needle is under the wire, the north pole turns in one
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