Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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495
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xlink:href
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ctu, aquæ; ſi enim ſumantur tres moles æquales auri,
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ſtanni, & aquæ, qualium partium pondus auri fuerit
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100. pondus ſtanni erit 39 proximè, & pondus aquæ
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erit 5. cum triente. </
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<
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id
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">Verùm, ex noſtra inuentione iņ
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Academia Experimentali Medicea explorauimus
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proportionem ponderis ſpecifici aquæ ad aerem, quæ
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fuit vt 1175 ad 1 proximè, igitur qualium partium
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alicuius ſphęræ aeris pondus eſt vnius grani, erit
<
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põ-dus
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dus</
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pilæ aqueæ eiuſdem molis 1175 granorum, qua
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re pila ſtannea eiuſdem menſuræ erit 8592
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granorũ
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,
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at que pila aurea eiuſdem diametri erit 21406 gra
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norum. </
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<
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id
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">His poſitis facto calculo, vt antepræmiſſą
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propoſitio perſcribit, reperitur proportio
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velocitatũ
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auri, & ſtanni in aqua vt 10 ad 9 proximè; ſed in ae
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re ſi velocitas auri fuerit 21405 erit velocitas ſtanni
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21404 ferè; & hinc patet quare in aere corpora inę
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qualiter grauia vt aurum, & ſtannum vniformi, & æ
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quali ferè velocitate deſcendunt, in aqua verò inſi
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gni exceſſu velocitas auri ſuperat ſtanni celeritatem
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in deſcenſu. </
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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<
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id
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">Sed hìc ſummoperè animaduertendum eſt, quod
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ſuperiùs expoſita theoria verificatur in paruis altitu
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dinibus, & in principijs deſcenſuum, non verò iņ
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prolixiori motu, propterea quod, vt mox declarabi
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mus, ab alia noua cauſa valdè alterantur prædictæ
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proportiones velocitatum grauium deſcendentium,
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pro cuius intelligentia præmittuntur hæc. </
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PROP. CCXLIV.
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Motus deſcenſus cuiuslibet grauis in fluido ſuccesſiuè retar-
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</
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