Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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it with the mouth downwards; whilſt it is full of water, which is
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conſtrained in the ſame manner to follow the Cup which contains it,
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and to riſe above the other water into the Region of the Air, as the
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Air is forced to follow the ſame Veſſell under the Surface of the
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ter, till that in this caſe the water, ſurmounting the brimme of the
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Cup, breaks in, driving thence the Air, and in that caſe, the ſaid
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brimme coming out of the water, and arriving to the Confines of the
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Air, the water falls down, and the Air ſub-enters to fill the cavity of
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the Cup: upon which enſues, that he no leſs tranſgreſſes the
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cles of the
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Convention,
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who produceth a Plate conjoyned with much
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Air, to ſee if it de ſeend to the bottom in water, then he that makes
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proof of the Reſiſtance againſt Elevation in Air with a Plate of Lead,
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joyned with a like quantity of water.</
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An
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ment of the
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peration of
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gures, in
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creaſing or
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ſening of the
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Airs Reſiſtance
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of Diviſion.</
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>I have ſaid all that I could at preſent think of, to maintain the
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Aſſertion I have undertook. </
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>It remains, that I examine that which
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Ariſtotle
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hath writ of this matter towards the end of his Book
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De Cælo
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;
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wherein I ſhall note two things: the one that it being true as hath
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been demonſtrated, that Figure hath nothing to do about the moving
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or not moving it ſelf upwards or downwards, it ſeemes that
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Aristotle
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at his firſt falling upon this Sp. </
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<
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>culation, was of the ſame opinion, as
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in my opinion may be collected from the examination of his words.
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>Tis true, indeed, that in eſſaying afterwards to render a reaſon of
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ſuch effect, as not having in my conceit hit upon the right, (which
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in the ſecond place I will examine) it ſeems that he is brought to
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admit the largeneſſe of Figure, to be intereſſed in this operation.
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>As to the firſt particuler, hear the preciſe words of
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Aristotle.
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Ariſtotles
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nion touching
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the Operation
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of Figure
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amined.</
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Ariſtot de Cælo,
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Lib. 4. Cap. 66.</
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Figures are not the Cauſes of moving ſimply upwards or downwards,
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but of moving more ſlowly or ſwiftly, and by what means this comes to
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paſs, it is not difficult to ſee.
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Ariſtotle
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makes
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not Figure the
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cauſe of Motion
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abſolutely, but
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of ſwiſt or ſlow
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motion,</
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<
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>Here firſt I note, that the terms being four, which fall under the
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preſent conſideration, namely, Motion, Reſt, Slowly and Swiftly:
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And
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Ariſtotle
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naming Figures as Cauſes of Tardity and Velocity,
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cluding them from being the Cauſe of abſolute and ſimple Motion,
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it ſeems neceſſary, that he exclude them on the other ſide, from being
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the Cauſe of Reſt, ſo that his meaning is this. </
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<
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>Figures are not the
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Cauſes of moving or not moving abſolutely, but of moving quickly
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or ſlowly: and, here, if any ſhould ſay the mind of
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Ariſtotle
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is to
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exclude Figures from being Cauſes of Motion, but yet not from
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being Cauſes of Reſt, ſo that the ſence would be to remove from
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Figures, there being the Cauſes of moving ſimply, but yet not there
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being Cauſes of Reſt, I would demand, whether we ought with
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Aristotle
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to underſtand, that all Figures univerſally, are, in ſome
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manner, the cauſes of Reſt in thoſe Bodies, which otherwiſe would
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move, or elſe ſome particular Figures only, as for Example, broad </
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