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 50
It is clear that the horizontal component will reduce to zero at the magneticpoles, where the needle points directly downward, and that it will reach a maximum o As it 13 probable that the student will not have practical need of a knowledge of the theory of deviation and the compensationof the… … Fig. 10. 44 THE COMPASS EBEOR. at the magnetic equator, where the free needle hangs in a horizontal direction. Thereverse is true of the vertical component and of the angle of dip. Values representing these different terms may be found from special charts. 97. Induction; Hard and Soft Iron.—Wlien a…
Navigation · Nautical astronomy
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
