Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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mirùm efficiatur vertex eius aliquo pacto rotundus,
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& contornatus, niſi adfuerit noua alia cauſa motum
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eius accelerans, à qua proindè eius vertex acumi
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nari poteſt, vt ſuperiùs dictum eſt.
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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">Pergamus modò ad poſtremam difficultatem ab
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eodem authore allatam. </
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<
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">inquit enim:
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ſint duæ pilæ
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æneæ, vna ſolida exigui ponderis, altera maioris, ſed reple
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ta incluſo aere, hæſine dubio aſcendit ſuper aquam, non
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item minor, ſi ergo aqua deorsùm tendens exprimit
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alterã
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pilam, cur non reliquam? </
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<
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">non igitur pila mouetur ſursùm,
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quia exprimitur, ſed quia in ſe habet aerem natura ſua le
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uem.
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<
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"> Et huic profectò argumento nil aliud reſponde
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re poſſum, ſed tantùm monere authorem eius ſe noņ
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eſſe ſatis memorem doctrinæ Archimedis, ex quą
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deducitur ingentem pilam æneam excauatam, & ae
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re plenam minùs ponderare, quàm moles aquæ ei æ
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qualis, & ideò grauitas aquæ maior velut in librą
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ſursùm eleuare debet minus pondus prædictæ pilæ
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æne-aereæ, cum verò comparatur ænea pila ſolida
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licèt paruula ſit, illa tamen grauior eſt multò magis,
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quàm ſit moles aquæ huic pilulæ æqualis, cùmque
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comparatio fieri debeat inter duas moles æquales
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ſolidi nempè demerſæ pilæ æneæ
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cũ
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mole fluidi am
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bientis ei æquali, quia exceſſus ponderis penès pi
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lam
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æneã
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exiſtit, neceſſariò maior eius grauitas præ
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ualebit, ideòque mergetur, & ad fundum deſcendet,
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ex quo patet prædictum argumentum non probarę
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pilam ęne-aeream vim leuitatis in ſe habere. </
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Eiuſdem
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authoris no
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ua difficul
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tas.</
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Sed reijci
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tur.</
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<
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