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

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1
AGC eiuſdem olei aſcendentis neceſſariò explana­
tam, imò excauatam fore; quia ex hypotheſi pondus
ſpecificum aquæ ambientis ſuperat ſpecificam gra­
uitatem olei ABC; iam ſi eſt moles aquæ collateralis
FQPC æqualis medietati olei BGC, proculdubio
aqua FQPC grauior erit oleo BGC, vel ſi moles inę­
quales ſunt, aquæ momentum ſuperat olei momentum,
hiſce verò inæqualibus ponderibus ineumbunt, &
ſubijciuntur moles aquæ æque ponderantes, vel æ­
qualium momentorum, ergo in ſiphone compoſito
ex cylindri portione aquea VXKL, & ex cylindri
portione EIKL compoſita ex aqua, & oleo inæqua­
liter premuntur partes aquæ ſubiectæ GPXI. quæ li­
bram conſtituunt, nempè aqua CPXK maiori niſu
comprimitur ab aqua FQPC, quam aqua GCKI pre­
matur ab oleo BGC minus graui, & ideò ex coroll pr.
10. oleum BGC ſursùm impelletur ab aqua ſubiecta
GIKC, & talis expreſſio fiet (ex prop. 51.) tanta vi,
quanta eſt grauitas exceſſus ponderis aquæ FQPC
ſupra grauitatem olei BGC.
præterea quia aqua in­
ter EB, & LC dum fertur deorſum ad occupandum̨
ſpatium ab aſcendente oleo derelictum, neceſſariò
comprimit contunditque ſuperficiem collateralem̨
olei BC non duri, ſed cedentis, eſtque motus obli­
quus per ſuperficiem decliuem BC, ergo ſpatium̨,
ſeù alueus, per quod incumbens aqua pertranſirę
debet comprehenſum à ſuperficie aquæ FCK dire­
cto, & non impedito motu fluentis, & inclinatam de­
cliuemque olei BC ſuperficiem, continentèr magis

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