Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 135
ng westward. Maps on which such isogenic lines are depicted arecalled declination or variation maps. Since the ele-ments of the earths magnetism are continuallychanging, the lines can only be determined for CHAP. II.] ELECTRICITY AND MAGNETISM. 117 a definite time. We might similarly construct… … Fig. 67. the isogonic lines run for the most part from the northmagnetic pole to the .south magnetic polar region, but,owing to the irregularities of distribution of the earthsmagnetism, their forms are not simple. The isocliniclines of the globe run round the earth like the parallels Ii8…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
