Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 82
increases.Take, in Fig. 21, OA and OA as twolengths : the effective forces AB andAB will be equal; but the distanceAE will be less than AE. Hence thetime for A to vibrate must be greater than for A. Butto show that the increase in the time required is as thesquare root of the length would require… … V 68 GRAVITATION [§§121-122 This is a rather difficult matter to show experimentally,as we cannot vary gravity at pleasure. It is true, bygoing up mountains we may diminish gravity; but theamount of the diminution is uncertain, because it dependson the volume and density of the mountain as well as…
Physics
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