Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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tea.
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<
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"> Primò aio nil referre an moles aquæ ſit maior,
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aut minor reſpectu olei, & aeris, ſed ſufficit vt gra
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uitas ſpecifica aquæ, multò maior ſit reſpectu aggre
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gati ex aere, & oleo, quàm reſpectu ſolius olei, ita
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que in caſu noſtro moles aquæ, ſiue magna, ſiue exi
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gua, in fiſtula poteſt comparari cum oleo tantùm, vel
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cum aggregato ex oleo, & aere; modò ex Archime
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dis doctrina eadem aqua grauior eſt ſpecie aggre
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gato ex oleo & aere, quàm oleo ſolitario, & quò ma
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ior fuerit differentia grauitatum ſpecificarum, tantò
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maior, cęteris paribus, eſt velocitas mobilis in fluido,
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& hinc
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quòd ea quæ adducta ſunt, vt maximè
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abſurda
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inconuenientia non ſunt, ſed è contrà
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neceſſitate mechanica contingere debent. </
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oppoſitioni, vbi ait:
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Nec denique dici poteſt coniunctum
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ex oleo, & aere eſſe aliquid leuius, quàm aquæ alterum
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tã-tum
">tan
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tum</
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in eadem mole, ideoque aquam illud magis in grauita
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te excedere, quàm oleum ſeorsùm ſumptum, & proindè ci
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tiùs illius locum occupare velle; nam ſi non datur leuitas,
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& particula aeris habet aliquid grauitatis potiùs ex illa, &
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oleo factum est corpus grauius, quàm est ſolum oleum.
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<
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"> Et
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hic nil aliud reſpondere poſſum, niſi quòd huiuſmo
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di ratiocinia condonari poſſunt ijs, qui in doctriną
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Archimedis minimè verſati ſunt. </
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<
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">Affertur enim, vt
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abſurdum, quòd aggregatum ex oleo, & aere grauius
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ſit abſolutè ſolo oleo, quod profectò non negatur, eſt
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enim veriſſimum, ſed tamen animaduertendum eſt,
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quod licèt prædictum aggregatum ex oleo, & aerę
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grauitate abſoluta magis ponderet, quàm oleum per </
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