Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 235
e magneticeffect of the earth or of neighboring magnets. Twoneedles seldom have exactly equalstrength ; so the combination hasa very slight tendency to standin a north and south direction ;but it is much more readily de-flected than a single needle, andthus will show the presence of amuch weaker… … Fig. IIG.
Physics
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