Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 264
,it will always turn its north end in the same directionwith reference to the direction of the current of electricityflowing in the wire. Referring to Figure 130, supposethe current were flowing downward through the wire;if a magnetic needle were placed where one of the arrowsis drawn, the north… … Fig. 130. Fig. 131. with the wire as the center of these circles; but if thereis any iron or steel present, the form of these lines offorce will be materially changed. For instance, if apiece of iron of the shape shown in B, Figure 131, waslocated relative to the wire A as indicated, the shape…
Electricity
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