Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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SVPPOSITIO VI.
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<
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">SVpponit præterea Aristoteles, quòd velocitas,
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qua idem corpus aſcendit, vel deſcendit in di
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uerſis medijs fluidis eamdem proportionem habet,
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quam raritates, vel conſiſtentiæ eorumdem fluido
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rum, ver. gr. ſi aer eſſet decies rarior, ac diſtrahibi
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lior, & faciliùs penetrabilis, quam ſit aquæ, eadem
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pila marmorea deſcendet cubitalem altitudinem ae
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ris decies velociùs, quàm profunditatem aquę pa
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riter cubitalem, ſcilicèt ſi prædictum aereum
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ſatiũ
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pertranſeat in vnica arteriæ pulſatione, aquæ altitu
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dinem percurret in decem eiuſdem arteriæ pulſ
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ationibus.</
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Ariſtotelis ſententiam dici debet.</
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<
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PROP. LV.
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Oſtendendum eſt Ignem non eſſe leuem, nec aſcendere vi
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leuitatis eius poſitiuæ.
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<
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gnis & terra, vel
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hydrargyrũ
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, aut aurum fuſum, vel quodlibet aliud grauiſſimum corpus, iuxtà Ari
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ſtotelis effatum ſi fieri poteſt, ſint abſolutè grauia, &
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leuia itaut ignis habeat quatuor gradus leuitatis, &
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nullam prorsùs grauitatem, è contrà terra, vel hy
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drargyrum quatuor gradus grauitatis habeat, nullam
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verò leuitatem, ſic enim terra erit abſolutè, & om
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ninò grauis, ignis verò abſolutè leuis, ergò (ex prop.</
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