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

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1
Prop. 221.
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
Secundò ſint cylindri AC, DF aqua grauiores; o­
ſtendetur (ex prop. 221.) quod deſcenſus X ad de­
ſcenſum Z, eodem tempore T factum, eſt ſicuti altitu­
do GB ad DE, & hoc erat, &c.
PROP. CCXXIX.
Poſtea ſi duo coni homogenei baſes æquales, & inæquales al­
titudines habuerint, & verticibus ſursùm vergentibus,
itaut axes eorum ſemper inter ſe æquidistantes ſint, &
infra aquam exiſtentibus percurrant aſcendendo, vel
deſcendendo ſpatia æqualia; tempora contrario ordine re­
ſpondebunt ſubduplicatæ proportioni altitudinum.
SInt duo coni eiuſdem materiei ABC, DEF, ſed
primò aqua leuiores, eorum baſes BC, & EF æ­
quales ſint, altitudo verò illius maior ſit huius altitu­
dine, inter quas ponatur GB media proportionalis;
tendant verò ambo ſursùm præcedendo vertices A,
& D, vt eorum axes paralleli ſint, percurrantque aſcen­
dendo
ſpatia æqualia AH, & DN
167[Figure 167]
nempe ABC tempore T, at DEF
tempore V; dico tempus V ad ten­
pus
T eſſe vt GB ad DE; quia æ­
qualia ſpatia percurrunt ſursùm̨
aſcendendo ſolida ABC, DEF,
ergo ſuis baſibus æqualibus dere­
linquunt ſpatia æqualia, & æquè
alta IBCK, & OEFP, & ibidem̨
fluere debent æquales aquæ moles
conos ambientes, quæ è ſupremis locis expelli de­
bent, excurrunt verò prædictæ aquæ moles per ſi-

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