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Magnetism and Deviation of the Compass; For the Use of Students in Navigation and Science Schools

Magnetism and Deviation of the Compass; For the Use of Students in Navigation and Science Schools


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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. 1876 Excerpt: ...permanent magnetism in steel magnets. Its effects on compasses will evidently depend on the direction the ship's head was in whilst being built. If built with her head north, the fore part of the ship has acquired red magnetism, and will act like the red pole of a magnet. The line of its action will coincide with that one which was in the magnetic meridian before the ship was launched; hence in our supposed case, in sailing northerly, the red end of the compass needle will be repelled, and the directive power of the needle diminished. On Southerly courses the red end of the needle points towards the stern, which has acquired subpermanent blue magnetism, then the directive power of the needle is increased. When sailing easterly or westerly, the effects on the compass are greatest, because the force acts at right angles to the needle; and at all intermediate stations the disturbances due to the position are intermediate. As the ship's head is brought east of north, repulsion of the red end of the needle takes place, and we get westerly deviation, and it reaches its maximum when the ship's fore-and-aft line is at right angles to the needle; beyond that position the fore part of the ship attracts the blue end of the needle, and westerly deviation is still the result. This continues until the ship's head is south, when the line of the ship's action is in the same line as that of the needle, and no disturbance occurs, but the directive power of the needle is greater. When the ship's head is brought round west of south, the blue pole of the needle is still attracted; this causes easterly deviation, and the maximum is again reached when the ship's fore-and-aft line is at right angles to the disturbed needle; this must occur to the north of west. After that point ha...


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Product Details
  • ISBN-13: 9781130269017
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130269019
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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