Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 199
eenthus neutralized, a much smallercurrent will deflect it than whenthe earths directive force has tobe overcome. This principle isused in increasing the sensibility of galvanometers. In Fig. 165,the galvanometer coil surrounds the lower needle and the directionof current between the two needles… … Fig, 167.—Connections of Double Coil Astatic Galvanometer. arranged so that the deflections may be read from the circular scale,or the instrument maj^ be used as a mirror-reflecting galvanometer, bymeans of the small mirror attached to th. vertical fibre suspension.A controlling magnet is also…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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