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 166
e mag-netic needle is also found to vary at most points from a truenorth and south line. This variation of the needle, at anyplace, is termed its declination. This declination is east ormest, according as the magnetic needle deviates towardsone side or the other of tlie true astronomical… … Wliat is the magnetic equator and its course? Point out this, as shown byFig. 128. What is meant by the declination of the magnetic needle ? Illus-trate tills by Fig. 128. What is the line of no variation ? DECLINATION OF THE MAGNETIC NEEDLE. 161 coincide, is termed the line of no variation^ as…
Physics
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