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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conſpici poſſunt poſito Magnete ſupra ſpeculum vitreum, infra quod
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alba jacet charta; </
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<
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">nulla enim ſuperficies datur lævigatior, ſupra quam
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ferrea Scobs, vel pulvis Indicus, in ſeries magis ordinatas diſponi
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poteſt.</
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<
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">Quicunque has ſeries circa Magnetem primo intuetur, extemplo
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judicaret eas a circumfluente circa lapidem Fluido pendere, quod
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delatum inter Ferri partes, eas tam juſto diſponeret ordine, cum
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viam ſibi quærit, atque Scobis partes, ut totidem obſtacula, removet:
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</
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<
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xml:space
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">attendenti autem nihil minus verum eſſe apparet; </
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<
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ferrea ſit admodum gravis & </
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">craſſa, debebit id fluidum, quod eam
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e loco moveret, ordinaretque, eſſe copioſum, veloci actem motu, & </
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<
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magnarum virium; </
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<
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xml:space
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">id igitur facilius movebit, propellet, disjiciet aut
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ordinabit Scobem parteſve corporum leviſſimas, uti farinam frumenti,
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Scobem Ligni, Eboris, Stanni, Cupri; </
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<
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xml:space
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hæc omnia circa Magnetem ſparſa non in ſeries diſponuntur, non mo-
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ventur, ſed jacent quieta, uti ceciderunt, ac ſi nullus afforet Magnes, an
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igitur fingipoteſt fluidum, quod corpora moveret craſſiora & </
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<
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">gravia, in
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leviſſima autem operari non poſſet? </
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">ſed non fluere in intervallis
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ſerierum dicatur fluidum, verum per ipſam Scobis ſubſtantiam, & </
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ea ideo ita ordinari; </
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">hoc conceſſo, quæram quomodo id fluidum
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non moveat partes leviſſimas farinæ, quibus occurrit, & </
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<
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cum moveat Ferri partes graviſſimas? </
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in ſeries intervalla relinquentes ordinetur, & </
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poſitas tantum habeat? </
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xml:space
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">Quas difficultates nemo ſolvet facile, prius-
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quam indolem virium Magneticarum melius intellexerimus.</
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pollices craſſum, cujus inferiori extremo applicatus fuit Magnes,
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illico Limatura recta ſurſum erigebatur: </
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">indicio vim Magnetis tranſire
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quoque per Ferrum, etiamſi craſſiſſimum.</
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<
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">Deinde ſupra aliud parallelopipedum ferreum, unum pollicem craſ-
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ſum, limatura Ferri ſatis denſe ſpargebatur, huic iterum præcedens
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parallelopipedum 6 pollicum impoſitum, ejuſque parti ſuperiori in-
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jecta quoque fuit Ferri Limatura, tum Magnes infimo </
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