Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1062
whirling motion aroundits axis, which latter does not change, see Figs. 421 and422. When a current passes through a spiral conductor, asshown in Fig. 423, in the direction indicated by the smallarrows, the direction of the lines of force produced willbe as indicated by the large arrow; but if,… … Fig. 423 DIRECTION OF LINES OF FORCE PRODUCED BY A CIRCULAR CURRENT There are, then, surrounding a conductor carrying acurrent of electricity, an infinite number of lines consti-tuting in fact a volume of force, and the strength of thisvolume, or field, varies with its nearness to, or distancefrom…
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