Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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habebant; ſed hinc non licet inferre, ſupremam la
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nam dum mouetur grauitatem exercere, quia illą
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conſtipatio non dependet ab actione grauitatis in
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cumbentis lanæ quæ actio perſeueret exerceaturque
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tempore deſcenſus, ſed illa conſtipatio eſt effectus
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compreſſionis in præcedenti quiete factæ, in actu e
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nim deſcenſus nullo pacto impellere poteſt ſuprema
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lana ſubiectam pani velocitate ictum fugientem, &
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ideo ſuper eam minimè pondus exercebit. </
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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 ponde
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rat.</
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PROP. XXI.
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Aqua deſcendens per aerem, nullam grauitatem habet, &
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ſolummodò eam exercet, quando quieſcit ſuper
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aquam.
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<
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">SImili modo aqua non deſcendit, quando fulci
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tur à ſuperficie terræ, & maris, ſed quando
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extra ſuum locum peregrinatur, & mouetur, vt iņ
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aere, & tunc ſi conſideretur cylindrus aqueus per ae
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rem deſcendens, diuidaturque in partes æquales à
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planis horizonti æquidiſtantibus; quia partes æqua
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les eiuſdem aquæ ſunt æquè graues, habent impe
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tus æquales à natura ſibi aſſignatos quibus deſcen
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dere deorſum nituntur, igitur pars ſuprema eiuſdem
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cylindri aquei æquè velox erit, ac pars ei ſubiecta,
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igitur ſuprema non poterit impellere, vel compri
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mere aquam ei ſubiectam, cùm æquali velocitatę
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hęc ictum, & percuſſionem fugiat cum quanta à ſu
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perincumbente inſectatur perſequiturque, ſicuti </
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