Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 198
Fig. 164.— DArsonval Mirror-Reflecting Galra-nonieter with Scale and Reading Telescope. … 331110 Fig. 165.—Connections of Single CoilAstatic Galvanometer. forming an astatic needle, fl 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…
Electricity · Magnetism
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