Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 248
he screen. By proper adjustment it may bemade to neutralise the earths action on the needle, so thatthe magnet is almost astatic. This is really a tangent galvano-meter, but as the deflections are always small, and the magnetis very short, the current is simply proportional to the deflec-tion, the… … Fiq. 145. panied by electrolysis, as well as to currents in solids, canbe shown by the arrangement represented in Fig. 145. The 230 Electricity. [Bookin. magnet (A) is suspended at right angles to the parallel zincand copper plates of a simple unclosed zinc-copper couple, andimmediately over the…
Electricity
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