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 196
69, tan d = 1.1918. 189. Thomson Mirror-ReflectingGalvanometer.— In this type of instrument, Figs. 161 and162, great sensibility has been attained bybringing thecoil as closeto the needleas possibleand windingit with manyturns of veryfine \vire.On the back Fig. 162.-Details of the Coil : of a small… … Fig. 161.—Thomson Mirror-Reflecting Galvanometer(single coil).
Electricity · Magnetism
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