Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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aqua operatur, veluti in ſiphone collocata fuiſſet. </
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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Cap. 3. flui
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dum in ſuo
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toto quie
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ſcens pon
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derat.</
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PROP. XXIV.
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Aqua in ipſamet aqua demerſa undiquè comprimitur ab
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ambiente aqua, & vtraque grauitatem exercet.
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">INtra vas ABCD aqua plenum intelligatur priſma
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aqueum FGHE, ductiſque planis FL, & GM pa
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rallelis horizonti. </
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">Dico, quòd aqua FH vndique pre
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mitur ab ambiente aqua FILKG, & vtraque pondus
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grauitatemque exercet. </
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ambiente ſiphonem AKD conſtituit, in quo fluidum
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ſibi homogeneum agitari poteſt, & quieſcit nihilo
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minùs; ergo vna pars fluidi AK
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æquilibratur, proindequè æquè
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ponderat, ac pars reliqua latera
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lis IC, portio verò aquæ FH licèt
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motu careat, ſitque indifferens
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ad motum ſursùm, & deorsùm,
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haud inferre licet eam non exer
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cere vim ſuæ grauitatis vnà cum tota aqua ambi
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ente, quia in ſiphonis brachio AK aquæ FH ſu
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prema facies FE deorſum impelli, & comprimi de
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bet ab incumbente aqua AE, pariterque infimą
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illius facies GH ſursùm impelletur à ſubiecta a
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qua GK non virtute propria, ſed eius quam exercet
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pondus aquæ collateralis IM; porrò nedum aqua FH
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impellitur ſurſum ab aqua ſubiecta BH, ſed etiam, vt
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experientia conſtat, impulſionem, &
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