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 39
H n n 24 ■- 2;l° r; f G 23 r.5; ■i\\ 22° F f F ■— E K 2« > c B b 1 1-, .°:^ ^—^— J ■ i ^ \ ^ 1 ^ i • • i • •—!••■ • i ——^ 1 ii^.^g-.... 16 INSTRUMENTS EMPLOYED IN NAVIGATION. The outer graduated circle is intended to represent the correct Magnetic Points of the horizon. The inner]graduated… … $-§ Fig. 19. Art. 59. A^i7/>/c->s J\Itf/iod\s 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…
Navigation · Nautical astronomy
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