Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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culum inane remaneat, &
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ignis camini nullo pa
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cto accendi poteſt, nec in flammam verti, aut per
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durare, niſi oſtiolum, vel foramen aliquod in ipſo ca
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mino aperiatur, & tunc facilè flamma accenditur, &
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perſeuerat. </
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<
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">Ratio huius effectus pendet nedùm ab
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impulſu flammæ ſursùm, ſed etiam à rarefactione ae
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ris propè ignem exiſtentis, eumque
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per to
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tam camini longitudinem, quia nempe aer prædictus
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ab igne calefactus minùs grauis ſpecie redditur,
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quã
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aer cubiculi, & externus, qui à camino diſtat; Hoc
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autem neceſſariò aduenit ex legibus mechanicis, &
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ex Archimedis
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; neceſsè enim eſt,
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vt aer rarior, & minùs grauitans ſursùm expellatur
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exprimaturque à grauiore aere
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, hinc
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fit vt poſt aſcenſum illius aeris rarefacti per
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diminuatur moles aeris ipſius cubiculi propè, & cir
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ca caminum. </
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<
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">Non ergo mirum eſt, nouum aerem pro
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fluere ad replendum cubiculi
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, & hæc eſt cau
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ſa, quare percipitur ventus ille, & effluuium per
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petuum dum flamma camini viget. </
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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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">Prædictum ratiocinium confirmari poteſt à pul
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cherrimo experimento à D. </
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tiæ mihi communicato. </
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PROP. LXI.
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Trutinæ æquilibratæ vna lanx excalefacta
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eleuatur
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extruſa à pondere aeris, reliquam lancem ambientis.
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<
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">ERat enim trutina, ſeù bilanx tantæ perfectionis,
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vt à quinquageſima parte vnius grani hordei, </
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