Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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quæ omnia falſa ſunt, & contra ſenſus euidentiam;
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Fatendum igitur eſt, ab igneis particulis fumum ra
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refactum eleuari ab impulſu grauioris aeris ambien
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tis per expreſſionem. </
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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. LXVII.
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Flamma eſt fumus accenſus magis rarefactus, qui ab aere
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ambiente velocisſimè ſursùm exprimitur.
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<
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cõſtructione
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per
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pendere modò iuuat metamorphoſim, quam̨
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patitur quando inflammatur. </
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cipere minimas particulas ſulphureas in fumo con
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tentas, cùm inflammantur, maximè dilatari, rarefieri,
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& vehementiſſimè agitari, & in hoc conſiſtere eius
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accenſionem, ſed granula illa aquea, & terrea eiuſ
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dem fumi, quæ ex ſua natura accenſibilia non ſunt,
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poterunt tantummodò rarefieri multò magis, quàm
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priùs. </
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<
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id
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rarefactione,
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agitatione, & accenſione ſubſequitur conſequen
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tèr ſplendida, & luminoſa apparentia flammæ. </
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<
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hæc aeris ambientis grauitas, licèt exigua ſit, ſupe
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rabit nihilominùs notabili exceſſu minimum, & in
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ſenſibile pondus ipſius flammæ multò, & multò ma
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gis, quàm ſuperauerat pondus
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præcedẽtis
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fumi:hinc
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neceſſariò flamma ab ipſo aere per extruſionem ſur
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sùm impelletur ineffabili velocitate. </
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<
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aduertenda ſunt. </
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