A text-book of physics : with sections on the application of physics to physiology and medicine (1902)
Lehfeldt, Robert Alfred, 1868-1927 · London : E. Arnold · leaf 228
withaccuracy it is best to use an indirect method, that known as thepotentiometer, in which a galvanometer or electrometer is em-ployed, but only as a null instrument, not to give direct readingsby means of its deflection. The connexions are shown inPig. 74 diagrammatically; 1m is a thin wire of… … Fig. 73. 2l3 ELECTRIC CURRENTS this wire a constant current flows from the battery a ; thisshould consist of an accumulator, as it yields more steadycurrents than any primary cell; the E.M.F. of A must be greaterthan that to be measured, so that if the latter is higher than2 volts, two or more…
Physics
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