Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination. Reprinted from the United States magnetic declination tables and isogonic charts for 1902 (1909)
U.S. Coast and Geodetic Survey · Washington Govt. Print. Off · leaf 48
- the needle lies somewhere between a truevertical line and a true horizontal line, nearer to the former than to the latter in thelatitudes under consideration. This is the direction in which the Earths magnetic forceacts. On the compass needle only the horizontal component of the force has an… … PlG. 9.—Cur\es sho^ving secular ch.inije in magnetic declination and dip at I.ondon Boston, and Baltimore. true direction of the Earths magnetic force and in its magnitude constitute the real factsto be studied. It is an interesting problem to inquire: How does the north end of the freelysuspended…
Magnetism, Terrestrial
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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