Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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do generali demonſtrabimus ſuppoſito quòd aer iņ
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aqua aſcendat
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virtute propriæ leuitatis, ſed per
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extruſionem medij fluidi tunc figura aeris
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aſcendẽ-tis
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per aquam neceſſariò erit conuexa ſupernè, & in
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feriùs excauata, & è contrà ſuppoſito quòd aer inter
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no principio leuitatis per aquam aſcenderet, deberet
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figura aeris aſcendentis tumorem, & rotunditatem̨
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habere tùm ex parte ſuprema, tùm ex parte ſubiecta. </
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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. LXXII.
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Et primo oſtendendum est, quòd quodlibet fluidum intra
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aliud fluidum tranſlatum ſiuè virtute propria, ſiuè alie
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na violentia impulſum, dummodò eius partes non diſ
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ſipentur in ipſo fluido in quo mouetur, ſed ſe
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mutuò contingant, & vniantur, neceſſariò
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tumorem, & rotundam figuram acqui
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ret in parte anteriori mo
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tus eius.
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<
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">QVodlibet fluidum
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naturali inſtin
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ctu videtur ſponte coaleſcere, ac ſimul in ſuo
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toto partes ſuas conglutinare, vt videmus partes ae
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ris libentèr, & auidè viciſſim vniri, & difficiliùs ab
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inuicem diſtrahi ſepararique, ſic quoque partes aquę
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vniuntur, conglobanturque ſphæricè
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ſibi mutuò approximantur, itaut ex duabus guttulis
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vna ſuper aliam excurrendo, & ſe mutuò
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do</
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vnicam ampliorem guttam
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, eſtque tàm
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tenax huiuſmodi vnio, & vinculum partium aquæ, vt </
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