Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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impreſs the Figures for cutting or penetrating this or that Body,
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as the ſolidity or obdurateneſs of the ſaid Bodies ſhall be greater
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or leſs, is very neceſſary: but withall I ſubjoyn, that ſuch
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ion, election and caution would be ſuperfluous and unprofitable, if
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the Body to be cut or penetrated, ſhould have no Reſiſtance, or
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ſhould not at all withſtand the Cutting or Penitration: and if the
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Knife were to be uſed in cutting a Miſt or Smoak, one of Paper
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would be equally ſerviceable with one of
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Damaſcus
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Steel: and ſo
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by reaſon the water hath not any Reſiſtance againſt the Penitration
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of any Solid Body, all choice of Matter is ſuperfluous and needleſs,
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and the Election which I ſaid above to have been well made of a
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Matter reciprocall in Gravity to water, was not becauſe it was
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ceſſary, for the overcoming of the craſſiitude of the water, but its
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Gravity, with which only it reſiſts the ſinking of Solid Bodies: and
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for what concerneth the Reſiſtance of the craſſitude, if we narrowly
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conſider it, we ſhall find that all Solid Bodies, as well thoſe that
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ſink, as thoſe that ſwim, are indifferently accomodated and apt to
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bring us to the knowledge of the truth in queſtion. </
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>Nor will I
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be frighted out of the belief of theſe Concluſions, by the
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ments which may be produced againſt me, of many ſeverall Woods,
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Corks, Galls, and, moreover, of ſubtle ſlates and plates of all ſorts
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of Stone and Mettall, apt by means of their Naturall Gravity, to
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move towards the Centre of the Earth, the which, nevertheleſs,
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ing impotent, either through the Figure (as the Adverſaries thinke)
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or through Levity, to break and penetrate the Continuity of the
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parts of the water, and to diſtract its union, do continue to ſwimm
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without ſubmerging in the leaſt: nor on the other ſide, ſhall the
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Authority of
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Ariſtotle
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move me, who in more than one place,
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meth the contrary to this, which Experience ſhews me.</
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No Solid of
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ſuch Levity, nor
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of ſuch Figure,
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but that it doth
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penetrate the
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Craſſitude of
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the Water.</
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>I return, therefore, to aſſert, that there is not any Solid of ſuch
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Levity, nor of ſuch Figure, that being put upon the water, doth not
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divide and penetrate its Craſſitude: yea if any with a more
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ſpicatious eye, ſhall return to obſerve more exactly the thin Boards
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of Wood, he ſhall ſee them to be with part of their thickneſs under </
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water, and not only with their inferiour Superficies, to kiſſe the
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Superiour of the water, as they of neceſſity muſt have believed, who
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have ſaid, that ſuch Boards ſubmerge not, as not being able to
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vide the Tenacity of the parts of the water: and, moreover, he
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ſhall ſee, that ſubtle ſhivers of Ebony, Stone or Metall, when they
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float, have not only broak the Continuity of the water, but are with
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all their thickneſs, under the Surface of it; and more and more,
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according as the Matters are more grave: ſo that a thin Plate of
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Lead, ſhall be lower than the Surface of the circumfuſed water, by
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at leaſt twelve times the thickneſs of the Plate, and Gold ſhall dive </
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