Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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mercurius eam attingat, propterea quòd partes illæ
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aereæ, quæ priùs ſummè dilatatæ erant in amplo ſpa
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tio inani in ſummitate fiſtulæ, poſtea reſtricto ſpatio
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ob mercurij aſcenſum denuò condenſantur, & proin
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dè mirum non eſt veſicam cyprinam ab aere eam am
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biente denſiori, quàm ſit aer intra veſicam
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,
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pati debere, & proinde detumeſcere. </
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Cap. 5. de ae
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ris grauitate
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æquilibrio,
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ſtructura, &
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vi elateria
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eius.</
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<
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">Quando verò ſubdit, quod aer intra fiſtulam im
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miſſus dum mercurius eleuatus eſt ad prædictam al
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titudinem cubiti vnius, & quadrantis proximè,
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fertur tanto impetu, vt ſupremum fiſtulæ fundum, &
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baſis diffringatur; diſſiliatque, & quia ab exceſſu exi
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gui ponderis tantus impetus creari non poteſt, hinc
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deducit non poſſe à cylindro aeris ambiente, & ab
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eius
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põdere
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vllo pacto impelli neque mercurius, ne
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que aer in prædicta fiſtula. </
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PROP. CVII.
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Aer in fiſtula Torricelliana adueniens nedùm pondere, ſed
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vi elaſtica, & impetu in motu acquiſito diffringere
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fundum ſupremum fistulæ poteſt.
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<
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">HVic difficultati occurro
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quòd mer
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curius in fiſtula ſursùm impellitur ab aere ex
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terno non vnica, ſed triplici vi, ponderis nimirum,
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virtutis elaſticæ ad modum machinæ, & impetus in
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motu acquiſiti: ſed præcipua, & inſignis actio in ca
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ſu noſtro impetui tribui debet. </
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<
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">Quia poſtquam è
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fiſtula cum mercurio extante in aere pendula effluit </
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