Wright, Mark R., 1854- · London : Longmans · leaf 157
Fig. 142. Declination.—The direction of a magnetic needle in Eng-land is to the west of the true northerly direction, as determinedby the polar star. The angle between the line pointing to thetrue north, and the direction of the magnetic needle, is calledthe angle of declination. The declination is…
Physics
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