Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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or of Ebony, ſwims by vertue of its dilated & broad Figure: for the
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truth is, that it bares up without ſubmerging, becauſe that that which
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is put in the water, is not pure Braſs or ſimple Ebony, but an
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gregate of Braſs and Air, or of Ebony and Air. </
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>And, this is not
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contrary unto my Concluſion, the which, (having many a time ſeen
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Veſſels of Mettall, and thin pieces of diverſe grave Matters float, by
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vertue of the Air conjoyned with them) did affirm, That Figure
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was not the Cauſe of the Natation or Submerſion of ſuch Solids as
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were placed in the water. </
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>Nay more, I cannot omit, but muſt
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my Antagoniſts, that this new conceit of denying that the
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cies of the Board ſhould be bathed, may beget in a third perſon an
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opinion of a poverty of Arguments of defence on their part, ſince
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that ſuch bathing was never inſiſted upon by them in the beginning
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of our Diſpute, and was not queſtioned in the leaſt, being that the
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Originall of the diſcourſe aroſe upon the ſwiming of Flakes of Ice,
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wherein it would be ſimplicity to require that their Superficies might
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bedry: beſides, that whether theſe pieces of Ice be wet or dry they
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alwayes ſwim, and as the Adverſaries ſay, by reaſon of the Figure. </
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Water hath
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no Gravity in
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Water.</
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Water
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miniſheth the
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Gravity of
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lids immerged
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therein.</
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The
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ment of a Braſs
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Ketle ſwiming
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when empty, &
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ſinking when
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full, alledged to
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prove that water
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gravitates in
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water, anſwered.</
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An Ocean
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ficeth not to
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ſink a Veſſel
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cifically leſs
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grave than
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ter.</
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Air, the Cauſe
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of the Natation
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of empty Veſſels
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of Matters
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ver
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in ſpecie
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than
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the water.</
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Neither Figure,
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nor the breadth
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of Figure, is the
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Cauſe of
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tion.</
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>Some peradventure, by way of defence, may ſay, that wetting the
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Board of Ebony, and that in the ſuperiour Superficies, it would,
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though of it ſelf unable to pierce and penetrate the water, be born
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downwards, if not by the weight of the additionall water, at
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by that deſire and propenſion that the ſuperiour parts of the water
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have to re-unite and rejoyn themſelves: by the Motion of which
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parts, the ſaid Board cometh in a certain manner, to be depreſſed
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The Bathed
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Solid deſcends
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not out of any
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affectation of
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nion in the upper
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parts of the
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ter.</
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>This weak Refuge will be removed, if we do but conſider, that
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the repugnancy of the inferiour parts of the water, is as great against
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Diſ-union, as the Inclination of its ſuperiour parts is to union: nor can
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the uper unite themſelves without depreſſing the board, nor can it
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deſcend without diſuniting the parts of the nether Water: ſo that
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it doth follow, by neceſſary conſequence, that for thoſe reſpects, it ſhall
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not deſcend. </
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<
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>Moreover, the ſame that may be ſaid of the upper
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parts of the water, may with equall reaſon be ſaid of the nethe,
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namely, that deſiring to unite, they ſhall force the ſaid Board
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upwards.</
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>Happily, ſome of theſe Gentlemen that diſſent from me, will
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der, that I affirm, that the contiguous ſuperiour Air is able to
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that Plate of
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raſs or of Silver, that ſtayeth above water; as if I
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would in a certain ſence allow the Air, a kind of Magnetick vertue
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of ſuſtaining the grave
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B
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odies, with which it is contiguous. </
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<
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>To
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tisſie all I may, to all doubts, I have been conſidering how by ſome
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other ſenſible Experiment I might demonſtrate, how truly that little
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contiguous and ſuperiour Air ſuſtaines thoſe Solids, which being by </
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