Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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In lib: 1. of
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tation of Bodies
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Prop. </
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>7.</
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Figure operates
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not in the
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tion of Sollids.</
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>It was anſwered me, that that proceeded not from the greater Levity;
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but from the Figure, large and flat, which not being able to
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trate the Reſiſtance of the Water, is the cauſe that it ſubmergeth not.
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>I replied, that any piece of Ice, of whatſoever Figure, ſwims upon
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the Water, a manifeſt ſigne, that its being never ſo flat and broad,
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hath not any part in its floating: and added, that it was a manifeſt
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proofe hereof to ſee a piece of Ice of very broad Figure being thruſt
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to the botome of the Water, ſuddenly return to flote atoppe, which
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had it been more grave, and had its ſwimming proceeded from its
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Forme, unable to penetrate the Reſiſtance of the
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Medium,
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that
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would be altogether impoſſible; I concluded therefore, that the Figure
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was in ſort a Cauſe of the Natation or Submerſion of Bodies,
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but the greater or leſſe Gravity in reſpect of the Water: and
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fore all Bodyes heavier than it of what Figure ſoever they be,
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rently go to the bottome, and the lighter, though of any figure, float
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indifferently on the top: and I ſuppoſe that thoſe which hold
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wiſe, were induced to that beliefe, by ſeeing how that diverſity
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of Formes or Figures, greatly altereth the Veloſity, and Tardity
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of Motion; ſo that Bodies of Figure broad and thin, deſcend
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far more leaſurely into the Water, than thoſe of a more compacted
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Figure, though both made of the ſame Matter: by which ſome
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might be induced to believe that the Dilatation of the Figure might
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reduce it to ſuch ampleneſſe that it ſhould not only retard but wholly
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impede and take away the Motion, which I hold to be falſe. </
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<
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>Upon
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this Concluſion, in many dayes diſcourſe, was ſpoken much, and
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many things, and divers Experiments produced, of which your
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Highneſſe heard, and ſaw ſome, and in this diſcourſe ſhall have
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all that which hath been produced againſt my Aſſertion, and what
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hath been ſuggeſted to my thoughts on this matter, and for
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firmation of my Concluſion: which if it ſhall ſuffice to remove that
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(as I eſteem hitherto falſe) Opinion, I ſhall thinke I have not
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unprofitably ſpent my paynes and time. </
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<
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>and although that come
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not to paſſe, yet ought I to promiſe another benefit to my ſelfe,
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namely, of attaining the knowledge of the truth, by hearing my
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Fallacyes confuted, and true demonſtrations produced by thoſe
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of the contrary opinion.</
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>And to proceed with the greateſt plainneſs and perſpicuity that
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I can poſſible, it is, I conceive, neceſſary, firſt of all to declare
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what is the true, intrinſecall, and totall Cauſe, of the aſcending of
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ſome Sollid Bodyes in the Water, and therein floating; or on the
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contrary, of their ſinking. </
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<
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>and ſo much the rather in aſmuch as I
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cannot ſatisfie my ſelfe in that which
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Ariſtotle
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hath left written on
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this Subject.</
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The cauſe of the
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Natation & ſub</
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<
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>I ſay then the Cauſe why ſome Sollid Bodyes deſcend to
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