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 47
e, the broken cur\eagain representing the law from 1510 to present date, while the full cur\e representsthe obsenations which can be obtained with the aid of the early compass charts ofthe fourteenth and fifteenth centuries. The departure between the broken cur\-e andthe full one amounts to about… … l-iG. 8.—Comparison of the secular change curv-es of the magnetic declination at various stations in the Northern Hemisphere. between the secular change curves over the Earth. Each station bears a somewhatdifferent testimony of the phenomenon under consideration, and it is onh- b}- consider-ing the…
Magnetism, Terrestrial
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
