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

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1
quare manifeſtum eſt, quod velocitas deſcenſus auri
AC in aqua ad velocitatem deſcenſus ſtanni GI iņ
eadem aqua eamdem proportionem habebit, quam̨
differentia ponderum AC, DF ad pondus Y, & hoc
erat quæſitum.
Ca. 2.pr.10.
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
Prop. 140.
Ex pr 227.
& 228.
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
Et hinc patet neceſſitas quare ſolida ęqualia mo­
le, ſed inæqualiter grauia licèt æquè velocia ex ſui
natura ſint (ſcilicèt in vacuo) debent tamen inæqua­
libus velocitatibus in medijs fluidis deſcendere.
PROP. CCXLII.
Præterea idem ſolidum in mcdio fluido rariori, & minus
ponderoſo citiùs deſcendet, quàm in grauiori fluido, ſi ta­
men vtroque fluido ſolidum grauius ſpecie fuerit.
SInt duo fluida DF grauius, & KM leuius, & iņ
vtroque immergatur idem ſolidum AC vtroque
fluido grauius; dico, quod AC velocius deſcendet in
KM, quam in DF; ſint vt prius moles, & figuræ paral­
lelepipedæ æquales, & horizonta­
177[Figure 177]
liter diſpoſitæ cum æqualibus flui­

dorum parallelepipedis.
Quia, vt di­
ctum eſt conſtituuntur duo ſiphones,
& duæ libræ æquales, & radiorum̨
æqualium NO, & QR, quarum cen­
tra grauitatum T, & V; & ſummą

ponderum AC, & DF ad horum dif­
ferentiam eamdem proportionem̨
habet quàm radius libræ PN ad pen­
duli
longitudinem PT; idemque dicendum in reliqua
libra QR; & eidem ponderi AC additis, & ablatis

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