Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 765
n the second it is in theopposite direction. To correctthis error, the poles of the needlemust be reversed by remag-netising it in such a way thatwhat was a north is now madea south pole. The inclinationis now redetermined, and themean taken of the results ob-tained in the two groups ofoperations,… … Fig. 703 The Kew dip circle is in principle like the instrument just described,but is more elaborate. The needle is 3 inches long and turns aboutan axle, consisting of a fine steel cylinder, resting on agate edges. Thevertical circle is enclosed in a glass box, and the positions of the ends of…
Physics
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