Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
ior moles aquæ in tubo pneumatico eleuatur, & è con­
uerſo
maior moles aquæ in tubo pneumatico BR ele­
uata maiorem vim ſuſtentantem, & eleuantem exi­
git.
Intelligatur modò corpus FV eſſe aereum cylin­
drum embolo AB incumbens, eumque deprimens ſu­
pra aquæ libellam B (neglecta facilitatis gratia gra­
uitate ipſius emboli) pariterque ſit cor­
109[Figure 109]
pus EX alter cylindrus aereus ſuperfi­
ciei aquæ C incumbens, igitur quotieſ­
cumque duo pondera aerea FV, & EX
æqualia ſunt, æquali vi ſubiectam aquam
premunt, & in tali ſtatu aqua B nequę
eleuabitur, neque deprimetur, dum equè
comprimitur à columnis aereis FV, & EX
æquilibratis; at quando aduenit quæli­
bet exigua vis poterit ſuſtentare aereum
cylindrum FV æquilibratum, & ideò non
grauem, eumque ſursùm impellere, &
proindè prohibere eius preſſionem ſupra aquam B,
& tunc tanta præcisè erit compreſſio facta à cylindro
aereo EX ſupra ſubiectam aquam, quanta eſt vis, à
qua cylindrus aereus FV ſuſtinetur ſubleuaturque,
& tanta præcisè erit aquæ moles BS eleuata in tubo
pneumatico, igitur quantum præcisè augetur graui­
tas ipſius aquæ BS ſubleuatæ, tantum præcisè augeri
debet vis illa, qua cylindrus aereus FV ſursùm im­
pellitur, ſeù tantumdem augeri debet vis manus ſur­
sùm embolum trahentis, à quo paritèr aereus cylin­
drus FV ſuſtinetur impelliturque ſursùm.
Et hinc pa-

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