Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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namely, that Earth is leſs Grave than Water. </
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>The Veſſel that ſwims
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occupieth in the water, not only a place equall to the Maſs of the
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Earth, of which it is formed; but equall to the Earth and to the Air
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together, contained in its concavity. </
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>And, if ſuch a Maſs
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ded of Earth and Air, ſhall be leſs grave than ſuch another quantity
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of water, it ſhall ſwim, and ſhall accord with the Doctrine of
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medes
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; but if, again, removing the Air, the Veſſell ſhall be filled
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with water, ſo that the Solid put in the water, be nothing but
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Earth, nor occupieth other place, than that which is only poſſeſt by
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Earth, it ſhall then go to the Bottom, by reaſon that the Earth is
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heavier than the water: and this correſponds well with the meaning
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of
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Archimedes.
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See the ſame effect illuſtrated, with ſuch another
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Experiment, In preſſing a Viall Glaſs to the Bottom of the water,
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when it is full of Air, it will meet with great reſiſtance, becauſe it is
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not the Glaſs alone, that is preſſed under water, but together with
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the Glaſs a great Maſs of Air, and ſuch, that if you ſhould take as
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much water, as the Maſs of the Glaſs, and of the Air contained in it,
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you would have a weight much greater than that of the Viall, and of
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its Air: and, therefore, it will not ſubmerge without great violence:
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but if we demit only the Glaſs into the water, which ſhall be when
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you ſhall fill the Glaſs with water, then ſhall the Glaſs deſcend to
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the Bottom; as ſuperiour in Gravity to the water.</
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The Authors
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ſwer to the firſt
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Objection.</
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The Authors
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ſwer to the
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cond Objection.</
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<
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>Returning, therefore, to our firſt purpoſe; I ſay, that Earth is
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more grave than water, and that therefore, a Solid of Earth goeth to
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the bottom of it; but one may poſſibly make a compoſition of Earth
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and Air, which ſhall be leſs grave than a like Maſs of Water; and
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this ſhall ſwim: and yet both this and the other experiment ſhall
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very well accord with the Doctrine of
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Archimedes.
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But becauſe that
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in my judgment it hath nothing of difficulty in it, I will not
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ly affirme that
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Signor Buonamico,
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would by ſuch a diſcourſe object
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unto
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Archimedes
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the abſurdity of inferring by his doctrine, that Earth
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was leſs grave than Water, though I know not how to conceive what
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other accident he could have induced thence.</
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<
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>Perhaps ſuch a Probleme (in my judgement falſe) was read by
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Signor Buonamico
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in ſome other Author, by whom peradventure it
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was attributed as a ſingular propertie, of ſome particular Water, and
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ſo comes now to be uſed with a double errour in confutation of
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chimedes,
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ſince he ſaith no ſuch thing, nor by him that did ſay it was it
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meant of the common Element of Water.</
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<
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>The third difficulty in the doctrine of
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Archimedes
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was, that he
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could not render a reaſon whence it aroſe, that a piece of Wood,
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and a Veſſell of Wood, which otherwiſe floats, goeth to the bottom,
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if filled with Water.
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Signor Buonamico
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hath ſuppoſed that a Verſſell
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of Wood, and of Wood that by nature ſwims, as before is ſaid, </
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