Elementary treatise on physics, experimental and applied, for the use of colleges and schools; (1904)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, tr, Reinhold, Arnold William, 1843- ed · New York, W. Wood & Co. · leaf 750
ppfer,the force appears to diminish as the height of the place is greater; aneedle which made one oscillation in 24 seconds vibrated more slowly byo-oi of a second at a height of 1000 feet; but, according to Forbes, theforce is only -^-Jt^ less at a height of 3000 feet. There is, however, somedoubt… … -736] Determination of Horizontal Force 727 maximum between 4 and 5 in the afternoon, and is at its minimum between10 and II in the morning. It is probable, though it has not yet been ascertained with certainty, thatthe force undergoes secular variations. From measurements made at Kewit appears…
Physics
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