On the Magnet, Magnetick Bodies Also, and on the Great Magnet the Earth

On the Magnet, Magnetick Bodies Also, and on the Great Magnet the Earth

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Excerpt: ...than in a lower latitude. ariations are often slight, and generally null, when the versorium is at or near the earth's aequator. In a higher Latitude of 60, 70 or 80 deg. there are not seldom very wide variations. The cause of this is to be sought partly from the nature of the earth and partly from the disposition of the versorium. The earth turns magnetick bodies and at the aequator directs them strongly toward the pole: 227 at the poles there is no direction, but only a strong coition through the congruent poles. Direction is therefore weaker near the poles, because by reason of its own natural tendency to turn, the versorium dips very much, and is not strongly directed. But since the force of those elevated lands is more vigorous, for the virtue flows from the whole globe, and since also the causes of variation are nearer, therefore the versorium deflects the more from its true direction toward those eminences. It must also be known that the direction of the versorium on its pin along the plane of the Horizon is much stronger at the aequator than anywhere else by reason of the disposition of the 169 versorium; and this direction falls off with an increase of latitude. For on the aequator the versorium is, following its natural property, directed along the plane of the horizon; but in other places it is, contrary to its natural property, compelled into aequilibrium, and remains there, compelled by some external force: because it would, according to its natural property, dip below the horizon in proportion to the latitude, as we shall demonstrate in the book On Declination. Hence the direction falls off and at the pole is itself nothing: and for that reason a feebler direction is easily vanquished by the stronger causes of variation, and near the pole the versorium deflects the more from the meridian. It is demonstrated by means of a terrella: if an iron wire of two digits length be placed on its aequator, it will be strongly and rapidly direcshow more

Product details

  • Paperback | 156 pages
  • 189 x 246 x 8mm | 290g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236704002
  • 9781236704009