Browse Items (3 total)

'The earth as a magnet', Harpers

Tags: 1900s; 1908; 1908-10-1; Black, F. A. (Frederick Alexander); Compass; Earth Sciences; Geography; Geomagnetism; Geophysics; Magnetic declination; Observations

'Terrestrial magnetism', Harpers

Tags: 1900s; 1906; 1906-6-1; Adams, Cyrus C. (Cyrus Cornelius); Discoveries in science; Earth Sciences; Geography; Geomagnetism; Geophysics; History; Magnetic declination; Observations; Secular variations

'The mariner�s compass', Harpers

Tags: 1900s; 1904; 1904-2-1; Compass; Earth Sciences; Geography; Geomagnetism; Geophysics; Newcomb, Simon