Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ma corpus fluidum, & rarum eſt, cuius continentèr
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vna pars poſt aliam generatur, & eructatur à po
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ris eiuſdem titionis, pariterque fumum leuitatem̨
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poſitiuam habere, & exercere
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non minùs,
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quàm flamma habet, igitur neceſſariò fumus aſcen
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dens, & digrediens à titione deberet formam pyra
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midalem acquirere ſimilem ei, quam flamma lucer
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næ habet, deberetque paritèr in acumen ſubtile ſu
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periùs deſinere, quod profectò eſt falſum, & contra
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ſenſus euidentiam, proſequitur enim fumus ſuum̨
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iter longo tractu ſursùm abſque eo quòd in acumen
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reducatur. </
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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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">Id ipſum continget, ſi fiſtula aliqua aer in fundo
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aquæ inſuffletur,
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enim eleuari innume
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ræ ampullæ aereę, quæ ab inuicem ſeparantur abſ
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que eo quòd pyramidalem figuram acquirant, licèt
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aer non minùs quàm flamma leuis reputetur, & ab in
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trinſeco principio ſursùm moueri credatur, cùmque
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vna, & eadem cauſa non poſſit diuerſos effectus pro
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ducere, concedant neceſsè eſt, figuram, quam in
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flã-ma
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ma</
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obſeruamus diuerſam à figura fumi, & aeris per
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aquam aſcendentis ab alia cauſa longè diuerſa de
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pendere, non autem à prædicto principio intrinſeco
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leuitatis. </
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<
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">Et profectò ſi attentè perpendamus fumi, & flam
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mæ conſiſtentias, valdè inter ſe differre reperiemus,
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licèt ambo ſint corpora rara, & fluida. </
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