Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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cipio pendens naturalis, & intrinſecus quoque erit,
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igitur etiam illa operatio aſcenſus erit naturalis qua
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tenùs pendet creaturque à principio intrinſeco, iņ
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eo enim ſolummodò caſu violenta
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poſſet
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à peregrino, &
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principio procrearetur. </
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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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">Contra hoc ratiocinium inſurgit inſignis Peripa
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teticus, & ait, quod ſubſequens aſcenſus vltra cen
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trum terræ, vel vltra perpendiculum per arcum BD
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non pendet, nec procreatur à grauitate eiuſdem cor
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poris, ſed ab impetu concepto per motum deſcenſus,
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qui impetus, inquit ille, res eſt, toto cœlo diuerſa à
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grauitate, imò prædictus impetus contra grauitatem
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luctatur. </
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Obiectiones
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recentioris
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authoris af
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feruntur.</
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<
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id
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">Patet ergò concedere aduerſarium pilæ aſcenſum
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poſt excurſum vltra centrum, vel vltra perpendicu
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lum effici, ac produci à virtute impetus impreſſi, qui
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nimirùm immediata cauſa, & principium eſt prædi
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cti aſcenſus, ſeù operationis, quæ nomine leuitatis
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inſignitur. </
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<
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">At quia præter immediatam cauſam illius
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aſcenſus, ſcilicèt præter impetum, adnotari præte
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rea debet cauſa productrix prædicti impetus, quæ
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eſt grauitas naturalis, & intrinſeca eiuſdem corpo
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ris, ergo hæc erit cauſa ſaltèm mediata illius poſtre
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mi aſcenſus, & hìc noto quod aduerſarius non negat,
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nec affirmat grauitatem fuiſſe cauſam, & principium
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productiuum prædicti impetus, ſed tantummodò ait
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valdè differre grauitatem ab impetu, imò naturas
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contrarias, & ſe mutuo deſtructiuas habere, quia ni
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mirùm non alia de cauſa ceſſat
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motus
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