ssel in this respect was far superior to any ship sists essentially of a magnetic needle free to revolve tions of the sun or .other celestial bodies, then the previously employed in magnetic work. Nevertheless about a horizontal axis and mounted on jeweled bear- navigation must be by… … fully and its magnetic moment the valuable magnetic work done Cruises of the Magnetic Survey Tacht " Galilee " From August 1, 1905, to and other constants have been de- by recent Antarctic expeditions September 1, 1907. termined, so that noting the de- in addition to those mentioned, flections it…
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