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

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contentum in vaſe FDE tantæ profunditatis, vt cy­
lindrus AC vniuersè, & perpendicularitèr ad Hori­
zontem mergi poſſit, vt eius baſis non contingat fun­
dum
vaſis FDE, atque ſupremus terminus C fluidi li­
bellam contingat.
Præterea applicari debet pondus
P ſupra verticem cylindri CA, itaut pondus P immi­
neat ſupra fluidi libellam, neque aliqua eius portio
78[Figure 78]
demergatur.
His præparatis
quia exceſſus ponderis R ſupra
S ad ipſum pondus S maiorem
proportionem habet quam gra­
uitas P ad pondus cylindri
ACB, ergò componendo, gra­
uitas R ad S maiorem proportio
nem habebit quàm duo ponde­
ra
P, & CAB, ſimul ſumpta, ad
pondus CAB; verùm grauitas
molis fluidi M æqualis ſolido AC ad pondus abſolu­
tum eiuſdem ſolidi AC habet eamdem proportionem,
quam R ad S, ergò moles fluidi M æqualis ſolido AC
ad ſolidum idipſum AC, ſeù illius pondus ad graui­
tatem huius habebit maiorem proportionem quàm
pondera P, & CAB ſimùl ſumpta ad pondus AC, &
proindè pondus abſolutum molis fluidi M æqualis
AC maius erit grauitate ipſius P vnà cum ponderę
cylindri AC.
Verumtamen Archimedes demonſtra­

uit ſolidum innatans tunc ſolummodò in fluido quie­
ſcere quando eius pondus abſolutum æquale fuerit
grauitati molis fluidi ambientis, quæ ſit æqualis por-

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