Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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31 - 60
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91 - 120
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391 - 420
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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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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. XLIV.
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Ratione mechanica à grauiori fluido celeriùs idem mobile
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ſursùm exprimitur, quàm à fluido minùs graui.
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<
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">HViuſmodi difficultates omninò vitantur effu
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giunturque, ſi certitudinem, & neceſſitatem
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ex principijs mechanicis pendentem ſequamur, ſci
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licèt poſita ſolummodò grauitate in omnibus cor
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poribus ſublunaribus; neceſsè eſt vt
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grauiſſimũ
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flui
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dum hydrargyri maiori impetu ſursùm per extruſio
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nem impellat lignum, quàm aliud
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fluidũ
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minùs gra
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ue, vt eſt aqua, ſicuti in bilance pondus vnius vnciæ
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maiori velocitate ſursùm impellitur à maiori preſ
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ſione contraria ponderis decem librarum, quàm à
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minori compreſſione ponderis vnius libræ. </
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ſtratio verò huius rei ſuo loco exponetur, ſed inte
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rim ſi effectus omnes qui obſeruantur in hiſce corpo
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ribus aſcendentibus ijdem prorsùs ſunt, & ijſdem̨
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legibus mechanicis fiunt, ac ſi omnia corpora gra
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uia fuiſſent, ſed inæquali grauitate donarentur, &
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præterea in ijs non apparet phenomena motus fieri
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ea ratione, quæ requireretur ſi præter grauitatem̨
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reperiretur quoque aliud principium contrarium le
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uitatis: igitur concedendum eſt ſola grauitate natu
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ram operari, neque leuitatem vllam exigere. </
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qui difficultates, & ſubterfugia afferant pro
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retinẽ-da
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da</
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ſuæ poſitionis in ueriſimilitudine; aiunt enim li-</
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