Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſi æquilibrium momentorum efficiatur, ſcilicèt niſi
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momentum ponderis cylindri aerei ſuperficiem DE
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comprimentis æquale fuerit momento ponderis cy
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lindri mercurialis BF. </
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<
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plauſu à viris doctis excepta fuit, alijſque
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experimẽ-tis
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pariter comprobata, quia nimirùm ſi loco hydrar
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gyri aquam adhibeamus, vel aliud fluidum, tunc aqua
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pura eleuatur ad altitudinem pedum 32. vel cubito
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rum 17. proximè cuius pondus præcisè æquatur gra
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uitati prædicti cylindri mercurialis BF vnius cubiti,
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& quadrantis (ſumptis nimirum baſibus æqualibus)
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& ſi fuerit oleum altius quàm aqua pura eleuatur, ſed
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præcisè quantum exigit aquæ grauitas ei æqualis;
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idemque continget ſi fuerit aliquis ſpiritus, vel qui
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libet alius liquor. </
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<
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">cùm igitur in hiſce omnibus fiſtulis
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eleuentur varij liquores, itaut eorum partes eleuatæ
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ſuper infimam libellam ſemper eiuſdem ſint grauita
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tis, dicendum neceſſariò eſt ab vnica, & eadem vi
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compreſſiua eleuari, quę ſemper eiuſdem roboris ſit:
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at nulla alia aſſignari poteſt præter pondus cylindri
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aerei liquori in ſcutella contento
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incũbentis
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. </
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<
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poteſt aer incumbens eleuare prædictos liquores, hoc
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autem minimè effici poſſet abſque eo quod in aerę
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æquilibrium efficeretur; ſicuti in maris oceano ex eo
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quod omnes partes aquæ æquali niſu deorſum ferun
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tur, & premunt, fit vt eius ſuprema libella ſphæricè
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contornetur, ſic paritèr ſuprema aeris ſuperficies
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ſphæricè tornata erit, ex eo quod partes eius omnes
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æquali niſu deorſum
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grauitãtes
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æquilibrium
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. </
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