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Abstract § 1. Lines of Inclination and Intensity in the Atlantic Ocean. The value of observations of the magnetic inclination and intensity made at sea, in determining the position and direction of the magnetic lines over those large portions of the globe which are covered by the ocean, has been justly pointed out in the scientific memoranda prepared by the Royal Society for the Antarctic Expedition; and the same publication notices the precautions which are necessary in order to eliminate, in results so obtained, the disturbing influence of the ship’s iron. The observations of Lieut. Bartholomew James Sulivan, R. N., which, by his wish and with permission of the Admiralty, will form a part of this communication, afford a practical illustration of the valuable and useful information, which a series of such observations, conducted with a proper measure of skill and patience, will produce, and of the degree of certainty which may be looked for when they are thus conducted, and when the requisite precautions are taken.
Edward Sabine (Thu,) studied this question.