Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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altitudinis alterius tunc velocitas, qua aqua defluit
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ab orificio longioris non eſt quadrupla, ſed duplą
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tantummodò eius velocitatis, qua aqua egreditur ex
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infimo breuioris fiſtulæ orificio. </
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quod prædicta fluida in fiſtulis erectis inæqualium̨
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longitudinum,
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prorsùs naturam habent,
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fune
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pẽdula
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, quorum proprietates alibi expoſuimus. </
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Cap. 11. gra
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uia in fluido
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velocitati
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bus inæqua
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libus ferri
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debere.</
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PROP. CCXV.
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Fluxus æquæ intra fistulam velocior eſt circa axim, quam
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propè internam cauam ſuperficiem eius.
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<
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tendum eſt, quod aqua velociùs fluit deorsùm̨
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in medio cauitatis fiſtulæ, ſeù circa eius axim, quàm
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versùs ſuperficiem eius cauam; propterea quod, vt
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ſupra dictum eſt, gluten ipſius aquæ, quæ ſuperficiei
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aſperæ internæ fiſtulæ adhæret magis retardat de
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fcenſum, & fluxum aquæ, quàm in intermedia parte
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cauitatis fiſtulæ, vbi inſenſibili tenacitate aquæ par
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ticulæ viciſſim impediuntur, & hoc euincitur duplici
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experimento; primò quia in ſupremo ſtrictæ fiſtulæ
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orificio excauatur eius ſuperficies ad modum ſcutel
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læ, è contra in egreſſu fluidi ſuperficies aquæ ad mo
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dum conoidis, ſeu monticuli turgidi deorsùm ex
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porrigitur, quod minimè fieri poſſet, niſi partes a
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quæ intermediæ faciliùs fluerent, quàm partes col
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laterales internæ ſuperficiei fiſtulæ proximę, & adhę
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rentes, quæ vt diximus, à ſtabilibus aſperitatibus fi-</
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