Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
habet, quam lignea moles ABC ad molem HIK. po­
natur leuitas, aut vis eleuans N, quæ habeat ad R quan­
libet
proportionem commenſurabilem ex inſinitis,
quæ proponi poſſunt pariterque fiat moles BM ex
eodem ligno conſtans quæ ad HIK ſe habeat vt N
ad R. mani feſtum eſt, quòd quotieſcumque lignum
BM æquatur ligno ABC, runc paritèr vis leuitatis N
æqualis erit ipſi S (eò quòd moles æquales eiuſdem̨
ligni ſursùm æquali vi leuitatis impellunt) & quo­
tieſcunque
ligni moles BM maior fuerit, quàm ABC
ſemper leuitas N maior erit leuitate S, & quando li­
gnum BM minus fuerit, quàm ABC, erit quoque le­
uitas N minor, quàm S, & habent BM, HIK, & N &
R quamcumque proportionalitatem commenſurabi­
lem, igitur (ex noſtro Euclide reſtituto) moles li­

gnea ABC ad molem HIK eamdem proportionem̨
habebit quam vis leuitatis S, qua nimirùm ABC in
aqua aſcendit, ad leuitatem R qua corpus HIK ele­
uatur in eodem fluido, quòd fuerat &c.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Lib. 3 prop.
24.
Si quis fortè ſuſpicaretur ex figurarum diuerſitate

prædictorum corporum leuium licèt eiuſdem conſi­
ſtentiæ homogeneæ ſint, & eumdem gradum rarita­
tis habeant, alterari poſſe iam dictam proportionali­
tatem, monendus profectò eſt, quod præter Ariſtote­

lis aſſertum, vbi ait, quod figuræ non ſunt cauſæ ſimplici­
tèr aſcenſus, vel deſcenſus corporum in fluido, ſed tantum­
modò tardioris, vel celerioris motus, idipſum poſtea de­
monſtratum fuit ex Mechanicis principijs à Ghetal­
do, & Galilæo.
attamen incaſu noſtro non requirun-

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