Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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neſſe of the Veſſel, in its acquiring in ſeveral hours of the day
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ſeveral degrees of velocity, they are with very little difference
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acquired by all its parts; for as well the precedent as the
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quent, that is to ſay, both the Eaſtern and Weſtern parts, do
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accelerate and retard almoſt in the ſame manner; and withal
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making that alteration by little and little, and not by giving the
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motion of the conteining Veſſel a ſudden check, and
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ment, or a ſudden and great impulſe or acceleration; both it
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and all its parts, come to be gently and equally impreſſed with
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the ſame degrees of velocity; from which uniformity it
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eth, that alſo the conteined water with but ſmall reſiſtance and
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oppoſition, receiveth the ſame impreſſions, and by conſequence
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doth give but very obſcure ſignes of its riſing or falling, or of its
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running towards one part or another. </
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>The which effect is likewiſe
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manifeſtly to be ſeen in the little artificial Veſſels, wherein the
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contained water doth receive the ſelf ſame impreſſions of
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ty; when ever the acceleration and retardation is made by gentle
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and uniform proportion. </
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>But in the Straights and Bays that for a
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great length diſtend themſelves from Eaſt to Weſt, the
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ration and retardation is more notable and more uneven, for
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that one of its extreams ſhall be much retarded in motion, and
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the other ſhall at the ſame time move very ſwiftly: The
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procal libration or levelling of the water proceeding from the
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petus
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that it had conceived from the motion of its container.
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>The which libration, as hath been noted, hath its undulations
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very frequent in ſmall Veſſels; from whence enſues, that though
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there do reſide in the Terreſtrial motions the cauſe of
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ring on the waters a motion onely from twelve hours to twelve
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hours, for that the motion of the conteining Veſſels do
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treamly accelerate and extreamly retard but once every day,
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and no more; yet nevertheleſſe this ſame ſecond cauſe
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ing on the gravity of the water which ſtriveth to reduce it ſelf to
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equilibration, and that according to the ſhortneſſe of the
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ſel hath its reciprocations of one, two, three, or more hours, this
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intermixing with the firſt, which alſo it ſelf in ſmall Veſſels is
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very little, it becommeth upon the whole altogether inſenſible.
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>For the primary cauſe, which hath the periods of twelve hours,
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having not made an end of imprinting the precedent
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on, it is overtaken and oppoſed by the other ſecond,
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dant on the waters own weight, which according to the brevity
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and profundity of the Veſſel, hath the time of its undulations of
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one, two, three, four, or more hours; and this contending
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with the other former one, diſturbeth and removeth it, not
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mitting it to come to the height, no nor to the half of its
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on; and by this conteſtation the evidence of the ebbing and </
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