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

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1
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
qualibus fiſtularum æqualium altitudinum, æqualibus
velocitatibus fluent; at earum moles eamdem proportio­
nem habebunt, quàm orificia.
SInt duæ fiſtulæ AB, & CD eiuſdem altitudinis, ſed
orificium infimum B minus ſit alterius orificio
D, atque eodem tempore T fluat
162[Figure 162]
ex B moles aquæ R, ex D verò ruat
moles aquæ S; dico eas paribus ve­
locitatibus per fiſtulas excurrere,
at moles aquæ R ad S eandem pro­
portionem habere, quam amplitu­
do foraminis B ad ſpatium forami­
nis D.
Quia ob altitudines æquales
fiſtularum AB, & CD fluxus aquæ
æquales velocitates habent; moles verò earum æqua­
libus velocitatibus, & eodem tempore per orificią

inæqualia B, & D fluunt; igitur, vt amplitudo fora­
minis B ad amplitudinem D, ita ſe habet moles aquæ
R ad molem S.
Caſtell. de
menſura a­
quæ curren­
tis lib. 1.
axiom. 4.
His præmiſſis vt velocitates quibus corpora eiuſ­
dem grauitatis ſpecificæ aſcendunt, vel deſcendunt
in fluido, dignoſcere valeamus primo loco accuratiùs
inquirenda eſt ſtructura, & mechanica operatio ſi­
phonis, & libræ, quam ſolidum cum fluido collatera­
li in quo aſcendit, vel deſcendit, conſtituit.
PROP. CCXXV.
Cylindrus ſolidus cum æquali mole aquæ ambientis libram
circularem, & ſiphonem tubicum conſtituit, cuius orificium
æquale eſt baſi cylindri ſolidi, & libræ fulcimentum est

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