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

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1
te egrediantur duæ moles aquæ æquales, temporą
quoque effluxuum erunt inter ſe æqualia; & è conuer­
ſo
.
Idemque dicendum eſt ſi tempora, atque moles
aquæ eadem velocitate dilapſæ habuerint quamlibet
proportionem æquè multiplicem, vel earumdem par­
tium.
His præmiſſis.
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
PROP. CCXX.
Si ex æqualibus fistularum orificijs temporibus æqualibus duæ
aquæ moles defluant inæqualibus velocitatibus, erunt
aquæ moles proportionales velocitatibus.
SInt fiſtulæ AB, & CD, quarum orificia infima B,
& D ſint æqualia, & eorum plana non ſit obliquè
inclinata ad directionem motus, quo aqua ab eis de­
fluit, ſed eiſdem directionibus perpendiculares ſint,
(& hoc intelligatur in omnibus ſubſequentibus pro­
poſitionibus), defluat poſtea moles aquæ R ex AB
velocitate M tempore T, & eodem
158[Figure 158]
tempore minor moles aquæ S deci­
dat ex CD velocitate N. oſtenden­
dum eſt molem aquæ R ad S eamdem
proportionem habere quam velo­
citas M ad N.
Sumantur alia velo­
citas H, & altera moles aquę O, hac
lege, vt H ipſius N, nec non O alte­
rius S quælibet, & eædem partes
ſint.
Patet, quòd eodem temporę
T ex foramine æquali ipſi B velocitate H fluet moles

aquæ O dum ex D velocitate N fuit aquæ moles S; &
ſiquidem velocitas H æqualis eſt velocitati M egre-

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