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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ta, {1/12} pollic. </
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<
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xml:space
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">craſſa, ſuper polo Magnetis ducta, vim attractricem
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accepit; </
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<
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xml:space
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">exploravi quantum ponderis ferrei lamina ab extremitate
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alterutra geſtabat, ut virium Magnitudinem cognoſcerem, ponde-
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re cognito, eidem extremitati appoſitæ & </
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<
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læ, quæ nunquam antea Magnetem olfecerant, quæ erant æquales
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& </
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<
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</
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<
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">deinde iterum expertusfui, quantum ponderis lamina prior nunc ele-
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varet, an vires attractrices decreviſſent, communicatæ cum 20 aliis
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lamellis, an vero permanſiſſent; </
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<
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xml:space
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">idem omnino pondus geſtari cum
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eadem facilitate deprehendi, ac ante; </
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<
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xml:space
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">unde concludendum erat,
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vires quidem a Ferro communicari cum Ferro, ita tamen ut id, quod
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liberalitatem ſuam hac communicatione oſtendit, nihil amittat. </
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Unde vero aliorum error, vires imminui ſtatuentium? </
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tem: </
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">Cum ſupra Ferrum plures laminæ traducuntur, ſordes abra-
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duntur, quæ extremitati adhærent, huic igitur ſi pondus geſtandum
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apponis, non id immediate metallo applicas, ſed corpuſculis inter-
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poſitis, hinc aliquo intervallo pondus a Ferro ſejunctum tantis vi-
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ribus attrahi nequit, quemadmodum Experimenta ſuperius in Ca-
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pite primo & </
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">hanc erroris eſſe veram
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cauſam affirmo, mihi enim primum hoc tentanti viſa fuit eorum
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Philoſophorum ſententia non repugnare veritati, quippe minus pon-
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deris geſtabat lamina poſt, quam ante, aliarum affrictum, obſer-
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vatis autem extremitati appenſis ſordibus, iiſque abſterſis, pondus
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priſtinum a laminâ ferebatur.</
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primam, Lapidi antea applicatam, frictæ, acceperant; </
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bus vim attrahentem proxime æquam vigere deprehendi, in ſingu-
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lis tamen minorem, quam in prima lamina fuerat: </
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affricui cultrum majorem, qui vi Magnetica imprægnabatur, mi-
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nori tamen, quam in lamina erat, cui applicabatur: </
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<
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alium affricui, eidemque iterum alium, huic ultimo tandem quar-
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tum; </
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ticulam, vel pulviſculum Virginienſis arenæ attraheret, qualem </
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