A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 454
er tliat the linesof force due to the earths magnetism are horizontal.This is not, however, the case; the direction inwhich the lines are inclined is from north to south,according to tlie compass, but the lines make anyangle with the horizon (§ 128) ; 70° or 80° for instancein the United States. We… … tJie surveying-compass to find the magnetic meiidian(^ 183). The compass affords, however, little or noidea of the angle which the lines of force make with,the horizon, because a compass-needle is suspended soas to move approximatelyin a horizontal plane.^ Tofind the magnetic dip (§128), we may…
Physics
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