Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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DE MAGNETE.
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plurimas vires de ſe ſpargeret; </
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">hæ tamen a Ferro non recipiuntur
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ſemper in tanta copia, quam quidem illæ, quæ ex Magnete debili
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effluunt, & </
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">quare nonnullorum vires magis
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conveniunt cum fabrica partium Ferri, quam aliorum.</
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<
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">Datur ita etiam Ferrum, quod a Magnete parum virtutis accipit,
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dum interim aliud Ferrum ab eodem Magnete majori vi donatur.</
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">EXPERIMENTUM. XXXV.</
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">Si Ferrum ſubitiſſime ſupra Magnetem ſemel ducatur, aliquantum
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virtutis acquirit, ſi repetatur affrictio ſupra eundem Magnetis lo-
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cum & </
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">cum eadem directione, ferrum a Magnete elevando, quando
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ad extremum perductum eſt, augetur vis in Ferro, donec poſt ali-
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quot repetitos affrictus acceperit omnem vim, quam poteſt: </
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enim ſæpius reiterati affrictus ſupra eundem Magnetem, nihil plus
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virium Ferro concedunt.</
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">In hoc Experimento Ferrum a Magnete tantum determinatas acqui-
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rit vires non auctas, etiamſi millies Lapidi affricetur, quod non
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evenit, quia pluribus viribus accipiendis foret impar, ſed quoniam
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Magnes ille huic moli majores aut plures tribuere nequit; </
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hoc Ferrum ſuper liberaliori Magnete ducatur, majorem vim attra-
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hendi acquirit.</
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applicatum, tum non niſi elapſis aliquot horis imprægnatur vi Ma-
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gnetica, quemadmodum recte adnotavit Cl. </
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tot vires hoc modo recipit, ac ſi duceretur ſuper Magnete: </
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niam igitur mera Ferri applicatio ad Magnetem, aut velox ſuper eo
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ductus non largitur multum virtutis Ferro, præſtat hoc lente & </
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cum valida appreſſione Magnetis polo attriviſſe.</
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perit elevandi aliud Ferrum; </
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tis debiliorum virium, plurimum de vi accepta priori amittet, </
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