Chicago : [Popular Engineering Pub. Co.] · leaf 300
as shown in Fig. 135 in Chap- This predecessor of the electro-magnet took ter XX. He had then practically invented the form represented in Fig. 137. It con- what might be regarded as an electro-mag- sisted of a core of soft iron in the shape of a horseshoe and was provided with a single layer of… … FIG. 138. HENRY'S EARLY FORM OF HORSE- SHOE MAGNET net; that is, a magnet produced entirely by the passage of an electric current. As we instantly acquiring its magnetism on the have seen such a magnet would have an aerie passage of the magnetizing current and magnetic circuit, or a circuit in…
Electricity
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