The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 168
o a universal joint,placed upon a stand of three legs. Upon the bottom of thisbox, beneath a nicely-balanced magnetic needle, is pasted acircular card, graduated and marked to denote the points ofcompass, like that seen in Fig. 198, Electro-Magnetism. Thiscard is so arranged that its north and… … How does this vary in different latitudes ? Describe the Surveyors Com- THE COMPASS. 163 card is the angle of declination, or the bearing of the objectfrom the magnetic meridian. The Mariner^ s Compass isanother form of the declination compass, used for directing thecourse of a ship at sea. The box…
Physics
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