Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 124
be represented by certainlengths marked out along these lines. . Suppose thedistance P N is twice as great as P S, the repelling forcealong P N will be ^ as strong as the attracting forcealong P S. So measure a distance out, P A towards Sfour times as long as the length P B measured along P Naway… … Fig. 59- direction of the resultant magnetic force at the point P.In fact the line P R represents the line along which asmall magnet or an iron filing would set itself. In asimilar way we might ascertain the direction of the linesof force at any point of the field. The little arrows inFig. 59 show…
Electricity · Magnetism
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