Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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there are ſuch contrarieties of motions in the parts of the
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ſtrial Surface, whilſt it turneth round upon its own centre, it is
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neceſſary, that in conjoyning this Diurnal Motion, with the other
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Annual, there do reſult an abſolute motion for the parts of the
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ſaid Terreſtrial Superficies, one while very accelerate, and
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ther while as ſlow again. </
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>The which is manifeſt, conſidering
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firſt the parts about D, the abſolute motion of which ſhall be
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extream ſwift, as that which proceedeth from two motions made
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both one way, namely, towards the left hand; the firſt of
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which is part of the Annual Motion, common to all the parts of
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the Globe, the other is that of the ſaid point D., carried likewiſe
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to the left, by the Diurnal Revolution; ſo that, in this caſe, the
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Diurnal motion increaſeth and accelerateth the Annual. </
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<
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>The
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contrary to which happeneth in the oppoſite part F, which, whilſt
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it is by the common annual motion carried, together with the
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whole Globe, towards the left, it happeneth to be carried by the
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Diurnal converſion alſo towards the right: ſo that the
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nal motion by that means detracteth from the Annual,
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upon the abſolute motion, reſulting from the compoſition of both
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the other, is much retarded. </
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<
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>Again, about the points E and G,
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the abſolute motion becometh in a manner equal to the ſimple
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Annual one, in regard that little or nothing increaſeth or
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niſheth it, as not tending either to the left hand, or to the right,
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but downwards and upwards. </
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>We will conclude therefore, that
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like as it is true, that the motion of the whole Globe, and of
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each of its parts, would be equal and uniforme, in caſe they did
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move with one ſingle motion, whether it were the meer Annual,
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or the ſingle Diurnal Revolution, ſo it is requiſite, that mixing
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thoſe two motions together, there do reſult thence for the parts
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of the ſaid Globe irregular motions, one while accelerated, and
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another while retarded, by means of the additions or
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ons of the Diurnal converſion from the annual circulation. </
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<
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>So
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that, if it be true (and moſt true it is, as experience proves) that
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the acceleration and retardation of the motion of the
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ſel, makes water contained therein to run to and again the long
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waves of it, and to riſe and fall in its extreames, who will make
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ſcruple of granting, that the ſaid effect may, nay ought to
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ceed in the Sea-waters, contained within their Veſſels, ſubject to
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ſuch like alterations, and eſpecially in thoſe that diſtend
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ſelves long-wayes from Weſt to Eaſt, which is the courſe that
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the motion of thoſe ſame Veſſels ſteereth? </
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<
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>Now this is the
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moſt potent and primary cauſe of the ebbing and flowing,
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out the which no ſuch effect would enſue. </
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<
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>But becauſe the
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ticular accidents are many and various, that in ſeveral places and
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times are obſerved, which muſt of neceſſity have dependance </
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