Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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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. XIX.
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Lignum infra aquam demerſum, licèt pondus proprium, &
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aquæ incumbentis exerceat, non proinde ibidem
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quieſcet.
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">VT autem huius argumenti falla cia patefiat, in
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vaſe ARSE aqua pleno demergatur priſma li
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gneum, vel aereum HBDI ſitquę
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<
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pondus aquæ AI decem librarum̨
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v. g. lignum verò HD ſemilibram̨
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pendeat. </
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">Concedo, quòd lignum̨
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HD premit ſubiectam aquam BV
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non vi ſemilibræ, ſed robore libra
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rum decem, & ſemis, & ideo
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HD magis comprimit, ac grauitat,
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quàm ſola aqua incumbens AI, ſed non proindè ſe
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quitur, lignum HD quatenùs magis comprimit, ac
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grauitat in fundo aquæ perſiſtere debere, cùm ab
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alia cauſa ſursùm exprimatur. </
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<
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">Secto enim priſmatę
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aqueo CEFI æquali ipſi AI, & aqueo priſmate IG
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cuius moles æqualis ſit ligno HD, & eius pondus
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duas libras ſuperet; patet quòd aqua ſubiecta BV
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premitur à pondere librarum decem, & ſemis, at
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aqua DS comprimitur à pondere librarum duode
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cim; ergo sipho, vel libra mobilis aquea BG flecti
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debet eleuando lignum HD minus graue. </
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<
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patet, quòd ratio, quare lignum aſcendit, non eſt
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pondus aquæ incumbentis AI, ſed eſt aqua collate-</
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