The Philosophical magazine; a journal of theoretical, experimental and applied physics . earth will have already arrived at another pointbefore the water and the atmosphere have had time to properlyform the ellipsoid aced. Of course the currents will immedi-diately direct their course to the new point of attraction ; andsince this again alters its position, a current must be producedin the air and water which must endeavour to follow the motionof the moon and shift the cusps of the ellipsoid perpetually fromeast to west. On the other hand, by the shifting of the moon * It appears, therefore, t
The Philosophical magazine; a journal of theoretical, experimental and applied physics . earth will have already arrived at another pointbefore the water and the atmosphere have had time to properlyform the ellipsoid aced. Of course the currents will immedi-diately direct their course to the new point of attraction ; andsince this again alters its position, a current must be producedin the air and water which must endeavour to follow the motionof the moon and shift the cusps of the ellipsoid perpetually fromeast to west. On the other hand, by the shifting of the moon * It appears, therefore, that the zero-point of the tide-gauges has notyet received its true position. This must lead to erroneous results in level-ling-sui-vcys when the heights of two neighbouring seas are to he comparedin which the heights of the tides differ (as, for instance, Panama). t Miihry, Leber die Lchre von den Meeres-Striimungen, p. 9. in the Air and in the Sea. 169 from L to L, all the points in the arc ecu are moved somewhatnearer to the moon, and therefore the attraction of the moon on Fig. all these points is increased; while every point in the arc edahas removed a little further from the moon, and is consequentlyless attracted. We will represent the attraction of the moon bytwo threads L c and L d fastened to the circle. We will gradu-ally more and more draw the thread L c, to represent the con-stantly augmenting attraction of the point c. We will constantlylet the thread L d give way, to imitate the diminution of theattraction of the point d. Of course, through greater tension ofthe thread L c and continual yielding of the thread L d, thepoints c and d receive a motion in the direction of the arrows Cand D. This motion will be the quicker the greater the circleto which the points belong, because in greater circles the changeof distance from the moon, and consequently the alteration ofher attraction, is more considerable for every point than insmaller circles. All that we have just
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