Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 545
deto produce a considerable effect if carried many times round it. The ar-rangement for this purpose is shown in Fig. 258, where it will be perceivedthat the needle is surrounded by a coil of wire, so that the current circu-lates many times about it, and the effects of each part of the circuit… … Fig. 258.—Galvanometer. The arrangement of metals and acid which we have described is termeda voltaic couple, element, or cell; and a great controversy has long beencarried on among men of science as to the place at which the develop-ment of electricity has its origin. Three-quarters of a century…
Inventions
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