Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 125
rsed, the direction of thepoles will be reversed also. If an unmagnetized steel bar or needle is magnetizedin this way, as already explained, its polarity will be per-manently established in accordance with this rule. Asoft iron bar, or needle, will be temporarily magnetized ina similar manner… … Fig. 44. temporarily magnetized in this way are called electro-magnets. Their construction is illustrated by Fig. 44.The spiral winding shown at A being the reverse of thatshown at B, the spiral flow of the current is the reverse, MAGNETISM. 103 though its general direction is from right to left in…
Electricity
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