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 173
, nor is it easy to fix them perfectly parallel to one another.Such an astatic pair is, however,readily deflected by a current flowingin a wire coiled around one of theneedles; for, as shown in Fig. 82,the current which flows above oneneedle and below the other will urgeboth in the same direction,… … the opposite round the lower needle. Nobili applied the astatic arrangement of needles tothe multiplying coils of Schweigger, and thus constructeda very sensitive instrument, the Astatic Galvanoinete7%Shown Ln Fig. 88. The special forms of galvanometeradapted for the measurement of currents are…
Electricity · Magnetism
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