Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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it will paſſe any further, or elſe that there it would immediately
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ſtand ſtill, and move no further?</
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<
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>SIMP. </
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<
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>I believe that it would continue to move a great way
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further.</
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<
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>SALV. </
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>But this motion beyond the centre, would it not be
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wards, and according to your aſſertion preternatural, and violent?
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>And yet on what other principle do you make it to depend, but
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only upon the ſelf ſame, which did carry the ball to the centre,
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and which you called intrinſecal, and natural? </
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>Finde, if you can,
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another external projicient, that overtaketh it again to drive it
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upwards. </
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>And this that hath been ſaid of the motion thorow
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the centre, is alſo ſeen by us here above; for the interne
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impetus
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of a grave body falling along a declining ſuperficies, if the ſaid
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ſuperficies be reflected the other way, it ſhall carry it, without a
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jot interrupting the motion, alſo upwards. </
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>A ball of lead that
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hangeth by a thread, being removed from its perpendicularity,
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ſcendeth ſpontaneouſly, as being drawn by its internal inclination,
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and without any interpoſure of reſt, paſſeth beyond the loweſt
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point of perpendicularity: and without any additional mover,
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moveth upwards. </
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<
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>I know that you will not deny, but that the
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principle of grave bodies that moveth them downwards, is no leſs
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natural, and intrinſecal, than that principle of light bodies, which
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moveth them upwards: ſo that I propoſe to your conſideration a
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ball of lead, which deſcending through the Air from a great
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titude, and ſo moving by an intern principle, and comming to a
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depth of water, continueth its deſcent, and without any other
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terne mover, ſubmergeth a great way; and yet the motion of
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deſcent in the water is preternatural unto it; but yet nevertheleſs
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dependeth on a principle that is internal, and not external to the
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ball. </
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<
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>You ſee it demonſtrated then, that a moveable may be
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moved by one and the ſame internal principle, with contrary
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tions.</
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The natural
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tion changeth it
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ſelfe into that
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which is called
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ternatural and
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olent.
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<
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>SIMP. </
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<
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>I believe there are ſolutions to all theſe objections,
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though for the preſent I do not remember them; but however it
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be, the Author continueth to demand, on what principle this
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cular motion of grave and light bodies dependeth; that is,
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ther on a principle internal, or external; and proceeding
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wards, ſheweth, that it can be neither on the one, nor on the other,
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ſaying;
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Si ab externo; Deuſne illum excitat per continuum
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culum? </
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<
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>an verò Angelus, an aër? </
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<
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>Et hunc quidem multi
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nant. </
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<
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>Sed contra----[In Engliſh thus]
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If from an externe
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ciple; Whether God doth not excite it by a continued Miracle?
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<
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>or an Angel, or the Air? </
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<
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>And indeed many do aſſign this. </
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<
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>But
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on the contrary-----.</
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<
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>SALV. </
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<
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>Trouble not your ſelf to read his argument; for I am </
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