Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 55
are inch, and in extreme casesthe magnetism of a piece of soft iron has been pushed tosuch an extent as to produce a magnetic pressure of 1,000pounds per square inch. A piece of soft iron surroundedwith such a circulating current becomes a powerful electro-magnet, but almost all the magnetism… … arouDd the magnet in the direction of the motion of thehands of a watch, the pole facingthe observer in a S. pole. A little thought will showthat the magnetism of an elec-tro-magnet may be regarded asthe sum of the magnetic whirls ofthe wires surrounding the core.An inspection of Fig. 17 willshow…
Electricity
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