Gerard, Eric Mary, 1856-1916 · New York W.J. Johnston · leaf 221
nometer is by no means sensitive. In order to measure weak currents, the multiplier mustbe wound very close to the needle. In order to determinethe best form to give it with a view to economize the wireand diminish the resistance, let us take up again the expres-sion for the action of a circular… … Fig. 71. The area limited by this curve is the meridian section ofa volume of revolution about which the wire can be wound.All the spirals composing such a volume will have an actionon the unit pole at least equal to 5C. All the spirals exterior 206 ELECTROMA GNE TISM. to this volume will have a…
Electricity · Magnetism
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