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Home > The Mathematical Theory of the Deviations of the Compass; Arranged for the Use of the Cadets at the U. S. Naval Academy
The Mathematical Theory of the Deviations of the Compass; Arranged for the Use of the Cadets at the U. S. Naval Academy

The Mathematical Theory of the Deviations of the Compass; Arranged for the Use of the Cadets at the U. S. Naval Academy


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...a, b, c, d, e, f, g, h, 1c, P, Q, R, as well as the coefficients 21, D, S, i, would be constant, while the coefficients 33, C, /., would only change with a change of geographical position, by reason of their involving the dip and horizontal force; and though the hypothesis is not absolutely true, the so-called permanent magnetism being only sub-permanent, and the so-called transient magnetism requiring some time to change, the equations may still be considered as exact, provided we consider the parameters not as absolutely constant, but as subject to variations. As regards P, Q, E, their original values in iron-built ships depend on the position of the ship in building, and express an attraction of the north end of the needle to the part which was south in building. The values generally diminish when a ship has been launched and allowed to take up different positions. These changes make it necessary to have frequent determinations of the values of 93 and C. As regards the parameters representing the effect of the soft iron, those wiiich represent the three vertical soft iron rods, viz., c, /, 1c, probably do not change sensibly, as they do not change their inclination to the lines of force Mithout a change of geographical position; a change which necessarily occupies so much time that the masses of soft iron which they represent have time to receive their full charge of induced magnetism, notwithstanding any slowness in so doing arising from the imperfect softness of the iron. The parameters b, d, h, are so small that any change in them may be neglected. The parameters a, e, g, are, however, not only large in amount, but as the ship swings they are successively presented at all f Part IX. angjes 0 be lines of force, and it is in them that any slowness of th...


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Product Details
  • ISBN-13: 9781130157635
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130157636
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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