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 198
Fig. 164.—DArsonval Mirror-Reflecting Galva-nometer with Scale and Reading Telescope. … ^ Fig. 165.—Connections of Single CoilAstatic Galvanometer. forming an astatic needle, ^ 58, andsuspended, the earths field hasalmost no directive force on themagnetic system. Since the earthsattraction for this needle has beenthus neutralized, a much smallercurrent will deflect it than whenthe…
Electricity · Magnetism
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