Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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preſſio ſupra ſuperficiem hydrargyri D altiùs ele
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uatur mercurius in fiſtula BFA. ſic ſi noua fiſtula, vel
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inſtrumento pneumatico aer inſuffletur, vt compri
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mat ſuperficiem hydrargyri D eleuatur quoque ſu
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prema ſuperficies F hydrargyri in fiſtula clauſa; & ſi
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è contrà embolo retracto, velùti exugatur aer impe
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diatur que compreſſio eius ſupra mercurium D ſpon
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tè labetur mercurius deſcendetque deorsùm versùs
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B. præterea ſi ſupra mercurium in D infundatur aqua,
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quæ propagetur vique ad libellam GI, tunc quidem
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mercurius quoque eleuatur ab F vſque ad H, & quod
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mirum eſt, eleuatur mercurius præcisè pro menſura
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ponderis aquæ incumbentis GD, ſcilicèt altitudo G
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D erit quatuordeciès maior, quàm FH, quia talis re
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ciprocè eſt proportio ponderis mercurij ad aquam.
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uationis hydrargyri FH aſſignari poteſt præter gra
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uitatem aquæ collateralis GD cum qua mercurius F
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H æquilibrium efficit, quare negabimus reliquum
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mercurij FB eleuari à pondere aliquo premente ſu
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perficiem D, quæ ſit ſemper eiuſdem roboris? </
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<
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que nullum aliud corpus grauitans aſſignari poſſit
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prætèr aerem, igitur neceſſariò ab hoc mercurius
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eleuatur. </
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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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<
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doctiſſimis in Italia, Gallia, & Anglia, de quibus fusè
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agitur in libro
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noſtræ Academiæ ex
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perimentalis Mediceæ nè repetamus ea, quæ iam paſ
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ſim vulgata ſunt, tantummodò recenſebo, & ad exa-</
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