American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 53
the deviations, it would be necessary to distinguish between theapproximate coefficients, B and C, here described, as alsa A, D, and E, to be mentioned later, and the exact coefficients denoted bythe corresponding capital letters of the German alphabet, which latter are in reality the forces… … FIG. 11. THE COMPASS ERROR. 47 105. The value of the subpermanent magnetism remaining practically constantunder all conditions, it will not alter when the ship changes her latitude; but thatdue to induction in vertical soft iron undergoes a change when, by change of geographical position, the…
Navigation · Nautical astronomy
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