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 182
in diameter. At the centre isdelicately suspended a magnetised steel needle notexceeding one inch in length, and usually furnished witha light index of aluminium. The instrument is adjusted 1 See note on Ways jf Reckoning Angles, p. 109. 564 ELEMENTARY LESSONS ON [chap. hi. by setting the coil in… … Fig. 89. due to a current passing round the circle is very uniformat and near the centre, and the lines of force are theretruly normal to the plane of the coil.^ This is not trueof other parts of the space inside the ring, the forcebeing neither uniform nor normal in directi-on, except znthe plane…
Electricity · Magnetism
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