Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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391 - 420
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retur, nullo pacto in tali caſu poſſet aqua ab inferiori
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ſitu H ſursùm impellere aerem G, propterea quod
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aqua DB cogitur excurrere deorsùm per vaſis aper
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tum foramen B, & ideò non poteſt motu reflexo ſur
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sùm impellere aerem G. igitur neceſsè eſt vt globus
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aereus G deferatur à vi fluentis aquæ, vt ipſa experi
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entia oſtendit. </
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<
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ductis, & excogitatis
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experimẽtis
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vſque adhuc euin
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cere perſuadereque poteſt exiſtentiam leuitatis po
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ſitiuæ, & è contrà ſemper multò magis confirmatur,
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demonſtraturque eius non exiſtentia, quaproptèr fa
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tendum eſt corpora, quæ leuia appellantur, ſursùm
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impelli per extruſionem à fluidis ambientibus gra
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uioribus. </
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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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">Sed coronidis loco afferam demonſtrationem à
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me excogitatam, abſolutè non dari in natura
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poſitiuã
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leuitatem, vtque commodiùs hoc efficiam primò
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nonnullas ſuppoſitiones ſenſui manifeſtas
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proponã
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,
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& deinceps aliqua lemmata ex principijs mechani
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cis deſumpta demonſtrabo. </
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DEFINITIO I.
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<
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">ET primò noto, quòd corpus ſiue ſimilare, & ho
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mogeneum, ſiue heterogeneum, tunc vocatur
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exiſtimaturque rarius ſpecie, quàm aliud, quando
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ſumptis æqualibus molibus eorumdem illud
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minorẽ
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copiam materialis ſubſtantiæ corporeæ, & ſenſibi
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lis comprehendit in eodem ſpatio, quàm iſtud, quòd
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profectò concipi poteſt, ſi intelligatur mino: copia </
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