Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. II. CAP. VI.
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ctionem fluidi in particulam, qua actione velocitas particulæ
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communicatur, pendere a tali deſcenſu particularum quo
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locus a particula occupatus impletur. </
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xml:space
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">Deſcenſus autem hic-
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">TAB XXXIII.
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fig. 1.</
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ce, ſi A ſit particula mota, cujus diameter ſit d e, quo-
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modocunque concipiatur, valet deſcenſum totius colu-
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mnæ BC ad profunditatem d e, poſitâ C in ſuperficie fluidi;
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">& </
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<
s
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xml:space
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">vis in hoc deſcenſu acquiſita tota impenditur actione
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in particulam motam, cui ergo vis communicatur æqualis
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illi quam columna hæc BD in deſcenſu hoc per d e acquirit,
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eſtque hæc æqualis illi quam particula acquireret cadendo
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ab altitudine CB .</
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">Hinc ſequitur fluidum preſſione fluidi ſuperincumbentis,
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">796.</
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(ab hac enim pendet etiam preſſio lateralis) ex foramine
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ea proſilire velocitate, quam corpus acquirit cadendo à ſupre-
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ma fluidi ſuperficie ad for amen uſque; </
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<
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">ſepoſitâ nempe, ut
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in hac demonſtratione, partium cobæſione, quæ licet exi-
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gua ſit, in fluidis plerisque tamen obſervatur; </
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<
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ſione particulæ exeuntes retinentur; </
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det, ex variis aliis cauſis extraneis velocitas fluidi minuitur,
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de quibus in capite ſequenti agam.</
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tuuntur.</
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nis quindecim pollicum, & </
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fig. 2.</
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quâ impletur; </
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">ita diſponitur ut fundus ejus elevetur circi-
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ter decem pollicibus ſupra fundum horizontalem arcæ li-
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gneæ CD, cujus longitudo eſt fere quatuor pedum, latitu-
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do unius pedis cum ſemiſſe, profunditas quinque aut ſex
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pollicum.</
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<
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">In F, ad altitudinem circiter ſedecim pollicum ſupra fun-
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dum arcæ CD, hæret tubus æneus horizontalis, cujus ca-
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vitatis diameter excedit ſemipollicem; </
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nâ clauditur, in cujus medio foramen datur diametri par-
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tis duodecimæ unius pollicis: </
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