Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 142
y vertical position may,thus, often be shown to have acquired magnetism. 437. The Earth is a Magnet.—The earth actslike a huge magnet in determining the direction of com-pass and dipping needles. Its inductive influence, asshown in the last experiment, strengthens the belief thatit has such action.… … Fig. 217. vertical position. When over the neutral line, the needleis horizontal. As it approaches the + end of the magnet,the needle again becomes vertical, but the — end of theneedle is drawn down. If a dipping needle be carriedfrom far southern to far northern latitudes, it will act in asimilar…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
