. On Deep-Sea Water Waves Caused by a Local Disturbance on or beneath the Surface. H AO o o (VI. Waves caused by a Local Disturbance. 81 The figure 4, which belongs to equation (101), shows the rise and fall of the■surface at various times and at a particular place of a great distance from theorigin, the unit of time being modified by tf = t^/(g/2x). For moderatelyrsmall values of t, which alone are applicable, the curve is unsymmetrical withregard to the axis of time and as tip time increases the rise and fall becomesmore and more symmetrical and, on the other hand, the oscillations followone
. On Deep-Sea Water Waves Caused by a Local Disturbance on or beneath the Surface. H AO o o (VI. Waves caused by a Local Disturbance. 81 The figure 4, which belongs to equation (101), shows the rise and fall of the■surface at various times and at a particular place of a great distance from theorigin, the unit of time being modified by tf = t^/(g/2x). For moderatelyrsmall values of t, which alone are applicable, the curve is unsymmetrical withregard to the axis of time and as tip time increases the rise and fall becomesmore and more symmetrical and, on the other hand, the oscillations followone another with ever decreasing period. For larger values of t, the courseof the curve ceases to represent the motion, which really dies away, forreasons explained already (foot note supra). As a practical application, the earlier part of this curve might serve todetermine the distance of the point under observation from the source of theexplosion, if we measure the time of any zero-point of the displacement or theinterval ( period) between any two adjacent ones. For example, if we take4
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