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 65
rnal change of the temperature has thus been reduced to a matter of a fewtenths of a degree, and in fact it is believed that even this small variation will be elimi-nated as soon as some other source of light than the present lamps has been introduced.It has been repeatedly found that any sudden… … PRINCIPAL FACTS OF THE EARTHS MAGNETISM. 59 been converted into a gradual progressive change, for which allowance can easily bemade, and amounting to between one-half and one-third of what it would be outside. Fig. 13, which shows the magnetograph of the Eschenhagen pattern in place atthe Baldwin…
Magnetism, Terrestrial
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
