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 66
horizon™ Testneedle. EARTHS MAGNETISM. 47 … and repulsion on one pole may, therefore, be considered equaland opposite, so that the bar is simply directed, and thereis no motion of translation. The distance through whichthe earths magnetic pole at-tracts the N-pole of a mag-netic needle is less than thedistance through which theS-pole of the…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
