Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 307
Astatic Galvanometer; Two Needles.—In the last sectionwe showed how to increase the currents action on the needle byincreasing the field-strength due to the current. There is another very effective manner in which the deflexionfor a given current may be almost indefinitely increased. Thisother… … Fig. ii. CH. XVII. GALVANOMETERS 28r single needle ; since, as we see in the formulae of §§ 5 and 6, weshould then weaken equally the currents action on the needle. But we can so combine two needles that they form with re-spect to the earth a smgle needle of as small a magnetic momentas we please ;…
Electricity
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