Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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pluuia deſcendat, fieri poteſt vt mercurius in fiſtula
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ſupremam illam altitudinem M pertingat, in eaque
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permaneat, & hoc nedum à nebulis, ſed à quacum
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que alia cauſa grauitante effici poteſt, ſi enim terre
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ſtris puluis à vento, vel alia commotion e ſursùm im
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pellatur, atque per aerem diſſipetur ſpargaturque
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tunc nemo dubitat aerem grauiori niſu ſuperficiem
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orbis terraquei comprimere. </
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cauſa nebula impellatur, vt nimirùm terram attin
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gat, ſcilicèt pluuia paulatim terram aſſequatur
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eã-que
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que</
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humectet, tunc patet innumera aquæ granulą
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terræ innici, neque amplius aeris grauitatem, &
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compreſſionem augere, & quia à terra ſubiecta ſu
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ſtentantur, non poſſunt vt priùs ſuo naturali pondere
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comprimere ſuperficiem infimam mercurij ſtagnan
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tis, & propterea ſemper à minori pondere mercu
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rius in C comprimitur prout magis pluuia ad terram
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perducitur, & prout magis aer illo pondere alleuia
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tur, & propterea ſuperficies eius in ſuprema fiſtulæ
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parte ſenſim deprimitur vſque ad infimum ſitum F.
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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 elaterią
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eius.</
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Non tamen
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conuerſa re
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gula vera est
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nam ab alijs
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cauſis eleua
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tio mercurij
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in fiſtula va
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riari poteſt.</
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<
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conuerſa regula generalis, vt nimirum quotieſcum
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que mercurius in fiſtula eleuatur debeat pluuia ex
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pectari, quando quidem poteſt huiuſmodi
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augmentũ
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compreſſionis produci ab aliqua ingenti agitatione
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ſupremæ atmoſphæræ; & ſi fortè à particulis aqueis,
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& terreis ſubleuatis maior grauitas aeris producitur
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fieri poteſt vt à violentia ventorum alibi tranſpor
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tentur nebulæ, & ſic pluuia alibi translata non deci-</
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