Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. II. CAP. IX.
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<
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2.</
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dicitur, quando aqua uniformiter fluit, ita ut in eodem lo-
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co ſemper ſit ad eandem altitudinem.</
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<
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3.</
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diculariter ad fundum, & </
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ponq.</
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rallelis, & </
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planum, ſive horizontale, ſive inclinatum, ſectio Fluminis
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cum tribus hiſce planis angulos rectos efficit, & </
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logrammum.</
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<
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<
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per ſingulas ſectiones eodem tempore fluit. </
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co quocunque eadem aquæ quantitas adfluat, quæ ex eo
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defluit, in eodem ſtatu Flumen non manebit; </
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ſtratio hæc locum habet, quæcunque fuerit alvei irregula-
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ritas, ex qua, alio reſpectu, multæ in Fluminis motu mu-
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tationes oriuntur; </
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vei inæqualitate.</
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<
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poſſunt, & </
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ergo irregularitatibus omnibus Fluminum curſus exami-
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nandus eſt; </
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rint, de nullo judicium, vero fundamento nixum, ferri
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poterit.</
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<
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ne ſenſibili attritu; </
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rallelis inter ſe & </
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eſſe & </
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fluat, maneatque in receptaculo ſemper ad eandem altitu-
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dinem, ut Flumen ſit in ſtatu manenti. </
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num inclinatum deſcendit & </
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æqualem aquæ quantitatem per ſingulas ſectiones </
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