Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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<
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>SIMP. </
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<
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>I think ſo, if ſo be the moveable be of a matter
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durable.</
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<
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>SALV. </
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>That hath been already ſuppoſed, when it was ſaid,
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that all external and accidental impediments were removed, and
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the brittleneſſe of the moveable in this our caſe, is one of thoſe
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impediments accidental. </
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<
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>Tell me now, what do you think is the
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cauſe that that ſame Ball moveth ſpontaneouſly upon the inclining
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plane, and not without violence upon the erected?</
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<
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>SIMP. </
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<
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>Becauſe the inclination of grave bodies is to move
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wards the centre of the Earth, and onely by violence upwards
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wards the circumference; and the inclining ſuperficies is that
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which acquireth vicinity to the centre, and the aſcending one,
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remoteneſſe.</
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>SALV. </
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<
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>Therefore a ſuperficies, which ſhould be neither
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clining nor aſcending, ought in all its parts to be equally
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ſtant from the centre. </
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<
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>But is there any ſuch ſuperficies in the
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World?</
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>SIMP. </
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>There is no want thereof: Such is our Terreſtrial
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Globe, if it were more even, and not as it is rough and
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nous; but you have that of the Water, at ſuch time as it is calm
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and ſtill.</
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>SALV. </
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>Then a ſhip which moveth in a calm at Sea, is one of
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thoſe moveables, which run along one of thoſe ſuperficies that
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are neither declining nor aſcending, and therefore diſpoſed, in
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caſe all obſtacles external and accidental were removed, to move
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with the impulſe once imparted inceſſantly and uniformly.</
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<
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>SIMPL. </
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<
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>It ſhould ſeem to be ſo.</
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>SALV. </
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>And that ſtone which is on the round top, doth not it
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move, as being together with the ſhip carried about by the
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cumference of a Circle about the Centre; and therefore
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quently by a motion in it indelible, if all extern obſtacles be
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removed? </
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<
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>And is not this motion as ſwift as that of the ſhip.</
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<
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>SIMPL. </
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<
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>Hitherto all is well. </
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<
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>But what followeth?</
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<
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>SALV. </
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<
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>Then in good time recant, I pray you, that your laſt
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concluſion, if you are ſatisfied with the truth of all the
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miſes.</
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<
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>SIMPL. </
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<
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>By my laſt concluſion, you mean, That that ſame
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ſtone moving with a motion indelibly impreſſed upon it, is not to
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leave, nay rather is to follow the ſhip, and in the end to light in
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the ſelf ſame place, where it falleth when the ſhip lyeth ſtill; and
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ſo I alſo grant it would do, in caſe there were no outward
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diments that might diſturb the ſtones motion, after its being let
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go, the which impediments are two, the one is the moveables
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inability to break through the air with its meer
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impetus
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onely, it
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being deprived of that of the ſtrength of Oars, of which it had </
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