Bible Encyclopedias
Isogonic Lines
1911 Encyclopedia Britannica
ISOGONIC LINES (Gr. iao^yc.iveos, equiangular), lines connecting those parts of the earth's surface where the magnetic declination is the same in amount (see Terrestrial magnetism).
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Isogonic Lines'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/i/isogonic-lines.html. 1910.