Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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Bottom of Water, is the exceſſe of their Gravity, above the
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Gravity of the Water; and on the contrary, the exceſs of the
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Waters Gravity above the Gravity of thoſe, is the Cauſe that others
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do not deſcend, rather that they riſe from the Bottom, and aſcend
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to the Surface. </
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<
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>This was ſubtilly demonſtrated by
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Archimedes
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in
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his Book Of the NATATION of BODIES: Conferred afterwards
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by a very grave Author, but, if I erre not inviſibly, as below for
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defence of him, I ſhall endeavour to prove.</
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merſion of
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ids in the
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ter.</
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>I, with a different Method, and by other meanes, will endeavour
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to demonſtrate the ſame, reducing the Cauſes of ſuch Effects to
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more intrinſecall and immediate Principles, in which alſo are
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vered the Cauſes of ſome admirable and almoſt incredible
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dents, as that would be, that a very little quantity of Water, ſhould
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be able, with its ſmall weight, to raiſe and ſuſtain a Solid Body, an
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hundred or a thouſand times heavier than it.</
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>And becauſe demonſtrative Order ſo requires, I ſhall define
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tain Termes, and afterwards explain ſome Propoſitions, of which,
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as of things true and obvious, I may make uſe of to my preſent
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poſe.</
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>DEFINITION I.</
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I then call equally Grave
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in ſpecie,
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thoſe Matters
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of which equall Maſſes weigh equally.
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<
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>As if for example, two Balls, one of Wax, and the other of ſome
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Wood of equall Maſſe, were alſo equall in Weight, we ſay, that
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ſuch Wood, and the Wax are
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in ſpecie
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equally grave.</
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<
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>DEFINITION II.</
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But equally grave in Abſolute Gravity, we call two
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Sollids, weighing equally, though of Maſs they be
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unequall.
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>As for example, a Maſs of Lead, and another of Wood, that
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weigh each ten pounds, I call equall in Abſolute Gravity, though
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the Maſs of the Wood be much greater then that of the Lead.</
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And, conſequently, leſs Grave
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in ſpecie.</
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<
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>DEFINITION III.</
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I call a Matter more Grave
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in ſpecie
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than another, of
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which a Maſs, equall to a Maſs of the other, ſhall
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weigh more.
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