their poles reversed. The effect of the arrangement is to neu-tralize the directive power of the earth, which, in the case ofa simple needle, interferes with the indications of the galvano-meter, since it acts in opposition to the deflecting power of thecurrent. In the astatic galvanometer one of… … Fig. 60.This arrangement will becomeclear by a reference to Fig. 60,which represents the form of theastatic galvanometer in commonuse. The astatic needle is suspend-ed, it will be observed, by a finethread, so as to have perfect freedomof motion. 552. When electric currentsflow in two parallel…
Physics
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