Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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that to move towards this, is a moving towards that of the World,
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that he cannot affirm, unleſs he ſuppoſeth, That the Centre of the
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Earth, from which we ſee theſe light aſcendent bodies to depart,
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be the ſame with the Centre of the World; which is as much as
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to ſay, that the terreſtrial Globe is conſtituted in the midſt of the
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World: which is yet that of which we were in doubt, and which
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Aristotle
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intended to prove. </
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>And do you ſay that this is not a
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manifeſt
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Paralogiſm
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* A famous
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Italian
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Painter.</
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Paralogiſm of
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riſtotle,
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in proving
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the Earth to be in
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the Centre of the
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World.
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The Paralogiſme
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of
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Ariſtotle
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another
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way diſcovered.
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>SAGR. </
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>This Argument of
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Ariſtotle
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appeared to me deficient
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alſo, and
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non
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-concludent for another reſpect; though it were
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granted, that that Circumference, to which the Fire directly
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veth, be that which includeth the World: for that in a circle,
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not onely the centre, but any other point being taken, every
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able which departing thence, ſhall move in a right line, and
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wards any whatſoever part, ſhall without any doubt go towards
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the circumference, and continuing the motion, ſhall alſo arrive
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thither; ſo that we may truly ſay, that it moveth towards the
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circumference: but yet it doth not follow, that that which
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veth by the ſame line with a contrary motion, would go towards
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the centre, unleſs when the point taken were the centre it ſelf,
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or that the motion were made by that onely line, which produced
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from the point aſſigned, paſſeth thorow the centre. </
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<
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>So that to
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ſay, that Fire moving in a right line, goeth towards the
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rence of the World, therefore the parts of the Earth which by
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the ſame lines move with a contrary motion, go towards the
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tre of the World, concludeth not, unleſs then when it is
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ſuppoſed, that the lines of the Fire prolonged paſs by the centre
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of the World; and becauſe we know certainly of them, that they
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paſs by the centre of the Terreſtrial Globe (being
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lar to its ſuperficies, and not inclined) therefore to conclude, it
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muſt be ſuppoſed, that the centre of the Earth is the ſame with
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the centre of the World; or at leaſt, that the parts of the Fire
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and Earth deſcend not, ſave onely by one ſole line which paſſeth
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by the centre of the World. </
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<
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>Which nevertheleſs is falſe, and
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pugnant to experience, which ſheweth us, that the parts of
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Fire, not by one line onely, but by infinite, produced from the
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centre of the Earth towards all the parts of the World, aſcend
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always by lines perpendicular to the Superficies of the
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al Globe.</
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<
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>SALV. </
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<
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>You do very ingeniouſly lead
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Ariſtotle
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to the ſame
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convenience,
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Sagredus,
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ſhewing his manifeſt equivoke; but
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withal you add another inconſiſtency. </
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<
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>We ſee the Earth to be
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ſpherical, and therefore are certain that it hath its centre, to which
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we ſee all its parts are moved; for ſo we muſt ſay, whilſt their
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motions are all perpendicular to the Superficies of the Earth; we </
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