The American practical navigator : being an epitome of navigation and nautical astronomy (1888)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Navigation, Cooper, Philip Henry, 1844-1912 · Washington : Govt. Print. Off. · leaf 37
N. by W North 16 INSTKUMENTS EMPLOYED IN NAVIGATION. The outer graduated circle is intended to represent the correct Magnetic Points of the horizon. The innetlgraduated circle is intended to show Ships Head by Compass, and the lines leading from it to the outer circlejindicate the corresponding… … Art. 59. A^apuis Method \% a combination of a curved line and a straight line, the deviation between whichshows at once the amount of compass deviation for each point. Its chief merit is that the deviation may bedetermined for a few points, and a symmetrical curve traced through them will give a…
Navigation · Nautical astronomy
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