Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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latus vitri fertur: </
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xml:space
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circum illos datur, ubi cavitates juguntur preſſio minuitur,
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& </
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<
s
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ſeſe mutuo fugiunt; </
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<
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tectus latus vitri fugit.</
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<
s
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">In cryſtalliſationibus etiam pulcherrima attractionis exem-
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pla habemus.</
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<
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5.</
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<
s
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">Elaſticitas, vocatur corporum proprietas, qua, ſi figura
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illorum vi aliqua mutetur, ad priſtinam figuram redeunt;
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</
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<
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">Si enim corpus quoddam ſit compactum, flectat ſe, & </
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prematur introcedat ſine ullo partium ſuarum ſublapſu, cor-
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pus revertet ad figuram ſuam vi illa, quæ ex mutua ſuarum
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partium attractione oritur.</
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<
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<
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">Illam vero aëris proprietatem, quæ illius elaſticitas dici-
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tur, oriri ex vi, qua partes ſeſe mutuo repellunt, ſuo tem-
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pore dicetur.</
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<
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">Et ne quis credat, quia cauſam prædictæ attractionis & </
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repulſionis non damus, illas inter qualitates occultas eſſe re-
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cenſendas. </
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<
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">Cum Newtono reſpondemus, „ nos illa principia
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„ conſiderare, non ut occultas qualitates, quæ ex ſpecificis
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„ rerum formis oriri finguntur; </
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„ leges, quibus res ipſæ ſunt formatæ; </
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<
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„ dem talia revera exiſtere oſtendunt Phænomena naturæ,
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„ licet, ipſorum cauſæ quæ ſint, nondum fuerit explicatum.
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<
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">„ Affirmare ſingulas rerum ſpecies ſpecificis præditas eſſe
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„ qualitatibus occultis, per quas eæ vim certam in agendo
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„ habeant, hoc utique eſt nihil dicere. </
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<
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">At ex Phænome-
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„ nis naturæ duo vel tria derivare generalia motus princi-
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„ pia, & </
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<
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„ actiones rerum omnium, ex principiis iſtis conſequuntur; </
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„ id vero magnus eſſet factus in Philoſophia progreſſus, et-
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„ iamſi principiorum iſtorum cauſæ nondum eſſent cognitæ.</
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