American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 53
the deviations, it would he necessary to distinguish between theapproximate coefficients, B and C, here described, as also A, D, and E, to be mentioned later, and the exact coe/Jicicnts 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 mil not alter when the ship changes her latitude; but thatdue to induction in vertical soft iron undergoes a change when, by change of geo-graphical position, the…
Navigation · Nautical astronomy
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