 | Nathaniel Bowditch - Nautical astronomy - 1906 - 670 pages
...latitude the effect of vertical induction will be opposite in direction to what it is in north. IIS. The heeling error is corrected by a permanent magnet...an effective compensation. For similar reasons to those affecting the compensation of В and C, the correction by means of a permanent magnet is not... | |
 | Compass - 1916 - 154 pages
...between the coefficients and the deviation: d = A + B sin •:' -f C cos s' + D sin 2*' + E cos 3s'. where d is the deviation, and z the ship's heading...an effective compensation. For similar reasons to those affecting the compensation of B and C, the correction by means of a permanent magnet is not general,... | |
 | Compass - 1915 - 156 pages
...deviation: d = A + B sin z' + C cos 2' -f D sin 2s' + E cos 23', where d is the deviation, and r;' the ship's heading by compass, measured from compass...an effective compensation. For similar reasons to those affecting the compensation of B and C, the correction by means of a permanent magnet is not general,... | |
 | Nathaniel Bowditch - Nautical astronomy - 1916 - 912 pages
...the effect of vertical induction will be opposite in direction to what it is in north latitude. 118. The heeling error is corrected by a permanent magnet...an effective compensation. For similar reasons to those affecting the compensation of В and C, the correction by means of a permanent magnet is not... | |
 | Harold Jacoby - Navigation - 1918 - 376 pages
...error is an additional deviation caused by the ship's rolling, and is corrected with an additional permanent magnet placed in a vertical position directly under the center of the compass bowl. 4. The following procedure may be used on a compass entirely uncompensated, or on a compass alrea'dy... | |
 | United States. Bureau of Naval Personnel - Compass - 1921 - 246 pages
...that part of the heeling error due to subpermanent magnetism will vary, on change of latitude, as J_, while that due to vertical induction will H vary as...an effective compensation. For similar reasons to those affecting the compensation of B and C, the correction by means of a permanent magnet is not general,... | |
 | United States. Bureau of Naval Personnel - Compass - 1921 - 248 pages
...will vary, on change of latitude, as J_, while that due to vertical induction will H vary as tan в. In south magnetic latitude the effect of vertical...an effective compensation. For similar reasons to those affecting the compensation of В and C, the correction by means of a permanent magnet is not... | |
 | Nathaniel Bowditch - Nautical astronomy - 1931 - 866 pages
...the effect of vertical induction will bo opposite in direction to what it is in north latitude. 118. The heeling error is corrected by a permanent magnet...an effective compensation. For similar reasons to those affecting the compensation of B and C, the correction by means of a permanent magnet is not general... | |
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The heeling error is corrected by a permanent magnet placed in a vertical position directly under the center of the compass. Such a magnet has no effect upon the compass when the ship is upright ; but since its force acts in an opposite direction to the... 