Galilei, Galileo
,
Discourse concerning the natation of bodies
,
1663
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A
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Magnetiſme in
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the
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A
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ir, by which
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it bears up thoſe
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Solids in the
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ter, that are
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tiguous with it.</
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The Effect of
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the Airs
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guity in the
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tation of Solids.</
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The force of
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Contact.</
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A
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n
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on of
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ion betwixt
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lids and the Air
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contiguous to
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them.</
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The like
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ation of
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junction
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twixt Solids &
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the water.</
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Alſo the like
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affectation and
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Conjunction
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twixt Solids
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themſeives.</
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Contact may
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be the Cauſe of
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the Continuity
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of Naturall
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dies.</
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>Now, purſuing my purpoſe, I ſay; that it needs not, that we have
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recourſe to the Tenacity, that the parts of the water have amongſt
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ſelves, by which they reſiſt and oppoſe Diviſion, Diſtraction, and Seper
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ration, becauſe there is no ſuch Coherence and Reſiſtance of
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for if there were, it would be no leſs in the internall parts than in
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nearer the ſuperiour or externall Surface, ſo that the ſame Board,
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ing alwayes the ſame Reſiſtance and Renitence, would no leſs ſtop
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the middle of the water than about the Surface, which is falſe.
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<
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>over, what Reſiſtance can we place in the Continuity of the water
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if we ſee that it is impoſſible to ſind any Body of whatſoever Matter
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Figure or Magnitude, which being put into the water, ſhall be
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and impeded by the Tenacity of the parts of the water to one another
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ſo, but that it is moved upwards or downwards, according as the Cauſe
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of their Motion tranſports it? </
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>And, what greater proof of it can we
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ſier, than that which we daily ſee in Muddy waters, which being put into
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Veſſels to be drunk, and being, after ſome hours ſetling, ſtill, as we
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thick in the end, after four or ſix dayes they are wholly ſetled, and be
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come pure and clear? </
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<
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>Nor can their Reſiſtance of Penetration ſtay thoſe
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impalpable and inſenſible Atomes of Sand, which by reaſon of
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exceeding ſmall force, ſpend ſix dayes in deſcending the ſpace of
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a yard.</
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T
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he ſettlement
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of
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M
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uddy
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ter, proveth that
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that Element
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hath no
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on to Diviſion.</
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Nor let them ſay, that the ſeeing of ſuch ſmall Bodies, conſume ſix dayes
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deſcending ſo little a way, is a ſufficient Argument of the Waters
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of Diviſion; becauſe that is no reſiſting of Diviſion, but a retarding of
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Motion; and it would be ſimplicity to ſay, that a thing oppoſeth Diviſion
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and that in the ſame inſtant, it permits it ſelf to be divided: nor doth the
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Retardation of Motion at all favour the Adverſaries cauſe, for that they
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to inſtance in a thing that wholly prohibiteth Motion, and procureth
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it is neceſſary, therefore, to find out Bodies that ſtay in the water, if one would
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ſhew its repugnancy to Diviſion, and not ſuch as move in it, howbeit
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ſlowly.
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Water cannot
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oppoſe diviſion,
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and at the ſame
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time permit it
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ſelf to be
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ded.</
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<
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>What then is this Craſſitude of the water, with which it reſiſteth Di
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viſion? </
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>What, I beſeech you, ſhould it be, if we (as we have ſaid
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with all diligence attempting the reduction of a Matter into ſo like a
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Gravity with the water, that forming it into a dilated Plate it reſts ſuſ
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pended as we have ſaid, between the two waters, it be impoſſible
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effect it, though we bring them to ſuch an Equiponderance, that
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much Lead as the fourth part of a Grain of Muſterd-ſeed, added to
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ſame expanded Plate, that in Air [
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i. </
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<
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>e. </
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<
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>out of the water
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] ſhall weigh four
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or fix pounds, ſinketh it to the Bottom, and being ſubſtracted, it
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to the Surface of the water? </
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>I cannot ſee, (if what I ſay be true, as it
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moſt certain) what minute vertue and force we can poſſibly find or
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gine, to which the Reſiſtance of the water againſt Diviſion and </
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