Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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check that is immoveable, they ſhall fly out with great
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ſity: the ſame effect following in that caſe, which we ſee dayly
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to fall out in a boat that running a ſwift courſe, runs a-ground, or
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meets with ſome ſudden ſtop, for all thoſe in the boat, being
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prized, ſtumble forwards, and fall towards the part whither the
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boat ſteered. </
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<
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>And in caſe the Earth ſhould meet with ſuch a
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check, as ſhould be able to reſiſt and arreſt its
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vertigo,
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then indeed
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I do believe that not onely beaſts, buildings and cities, but
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tains, lakes and ſeas would overturn, and the globe it ſelf would
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go near to ſhake in pieces; but nothing of all this concerns our
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preſent purpoſe, for we ſpeak of what may follow to the motion
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of the Earth, it being turn'd round uniformly, and quietly about
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its own centre, howbeit with a great velocity. </
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<
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>That likewiſe
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which you ſay of the ſlings, is true in part; but was not alledged
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by
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Salviatus,
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as a thing that punctually agreed with the matter
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whereof we treat, but onely, as an example, for ſo in groſs it may
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prompt us in the more accurate conſideration of that point,
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ther, the velocity increaſing at any rate, the cauſe of the
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ction doth increaſe at the ſame rate: ſo that
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v. </
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<
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>g.
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if a wheel of
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ten yards diameter, moving in ſuch a manner that a point of its
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circumference will paſs an hundred yards in a minute of an hour,
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and ſo hath an
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impetus
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able to extrude a ſtone, that ſame
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impetus
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ſhall be increaſed an hundred thouſand times in a wheel of a million
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of yards diameter; the which
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Salviatus
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denieth, and I incline to his
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opinion; but not knowing the reaſon thereof, I have requeſted it
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of him, and ſtand impatiently expecting it.</
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Graming the
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urnal
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vertigo
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of
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the Earth, & that
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by ſome ſudden ſtop
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or obſtacle it were
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arreſted, houſes,
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mountains
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ſelves, and perhaps
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the whole Globe
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would be ſhaken n
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pieces.
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<
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>SALV. </
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>I am ready to give you the beſt ſatisfaction, that my
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abilities will give leave: And though in my firſt diſcourſe you
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thought that I had enquired into things eſtranged from our
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poſe, yet nevertheleſſe I believe that in the ſequel of the diſpute,
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you will find that they do not prove ſo. </
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<
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>Therefore let
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Sagredus
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tell me wherein he hath obſerved that the reſiſtance of any
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able to motion doth conſiſt.</
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>SAGR. </
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>I ſee not for the preſent that the moveable hath any
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internal reſiſtance to motion, unleſſe it be its natural inclination
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and propenſion to the contrary motion, as in grave bodies, that
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have a propenſion to the motion downwards, the reſiſtance is to
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the motion upwards; and I ſaid an internal reſiſtance, becauſe
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of this, I think, it is you intend to ſpeak, and not of the external
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reſiſtances, which are many and accidental.</
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<
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>SALV. </
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<
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>It is that indeed I mean, and your nimbleneſſe of wit
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hath been too hard for my craftineſſe, but if I have been too
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ſhort in asking the queſtion, I doubt whether
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Sagredus
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hath been
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full enough in his anſwer to ſatisſie the demand; and whether
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there be not in the moveable, beſides the natural inclination to the </
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