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 758
rests on it, so that it can beremoved and its position reversed ; thus what was before the lower is nowthe upper face. The mean between the observations made in the two casesgives the true declination. For, let NS be the astronomical meridian, (ih the axis of figure of theneedle, and mn its… … -732] Mariners Compass 737 the needle, which was on the right of /;///, is now on the left (fig. 699), so thatthe declination, which was previously too small by a certain amount, is nowtoo large by the sameamount. Hence, pro-vided the error besmall, the true declina-tion is given by themean of…
Physics
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