Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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on other different concomitant cauſes, although they ought all
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to have connexion with the primary; therefore it is convenient
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that we propound and examine the ſeveral accidents that may
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be the cauſes of ſuch different effects.</
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Demonſtrations
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how the parts of
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the terreſtriall
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Globe accelerats
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and ratard.
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The parts of a
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Circle regularly
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moved about its
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own centre move in
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divers times with
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contrary motions.
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The mixture of
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the two motions
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annnal and
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nal, cauſeth the
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inequality in the
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motion of the parts
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of the terreſtrial
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Globe.
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The moſt potent
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and primary cauſe
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of the ebbing and
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flowing.
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>The firſt of which is, that when ever the water, by means of a
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notable retardation or acceleration of the motion of the Veſſel,
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its container, ſhall have acquired a cauſe of running towards this
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or that extream, and ſhall be raiſed in the one, and abated in the
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other, it ſhall not nevertheleſſe continue, for any time in that
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ſtate, when once the primary cauſe is ceaſed: but by vertue of
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its own gravity and natural inclination to level and grow, even it
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ſhall ſpeedily return backwards of its own accord, and, as being
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grave and fluid, ſhall not only move towards
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Æquilibrium
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; but
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being impelled by its own
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impetus,
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ſhall go beyond it, riſing in
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the part, where before it was loweſt; nor ſhall it ſtay here, but
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returning backwards anew, with more reiterated reciprocations of
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its undulations, it ſhall give us to know, that it will not from a
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velocity of motion, once conceived, reduce it ſelf, in an inſtant,
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to the privation thereof, and to the ſtate of reſt, but will
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ſively, by decreaſing a little and a little, reduce it ſelf unto the
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ſame, juſt in the ſame manner as we ſee a weight hanging at a
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cord, after it hath been once removed from its ſtate of reſt, that
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is, from its perpendicularity, of its own accord, to return thither
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and ſettle it ſelf, but not till ſuch time as it ſhall have often
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paſt to one ſide, and to the other, with its reciprocall
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brations.</
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Sundry accidents
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that happen in the
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ebbings & flowings
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The first
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dent.
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The Water
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ſed in one end of
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the Veſſel
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eth of its ſelf to
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Æquilibrium.</
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>The ſecond accident to be obſerved is, that the
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declared reciprocations of motion come to be made and repeated
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with greater or leſſer frequency, that is, under ſhorter or longer
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times, according to the different lengths of the Veſſels
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ing the waters; ſo that in the ſhorter ſpaces the
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ons are more frequent, and in the longer more rare: juſt as in
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the former example of pendent bodies, the vibrations of thoſe
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that are hanged to longer cords are ſeen to be leſſe frequent,
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than thoſe of them that hang at ſhorter ſtrings.</
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In the ſhorter
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Viſſels the
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tions of waters are
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more frequent.
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>And here, for a third obſervation, it is to be noted, that not
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onely the greater or leſſer length of the Veſſel is a cauſe that
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the water maketh its reciprocations under different times; but
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the greater or leſſer profundity worketh the ſame effect. </
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>And
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it happeneth, that of waters contained in receptacles of equall
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length, but of unequal depth, that which ſhall be the deepeſt,
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maketh its undulations under ſhorter times, and the
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ons of the ſhallower waters are leſſe frequent.</
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The greater
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profundity maketh
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the undulations of
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waters more
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quent.
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>Fourthly, there are two effects worthy to be noted, and
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ligently obſerved, which the water worketh in thoſe its </
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