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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">Tabulæ D inſiſtat Acus C D perpendicularis, at-
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tracta a Magnete ſuperius poſita A B, tum admoveatur Acus F G
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tranſverſe, quæ ulterius promota tranſiret inter Acum C D & </
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gnetem A B, illico cadet Acus C D, non amplius attracta.</
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">Quantum igitur a viâ ſuâ detorqueri poteſt vis Magnetica, imo
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quam facilea parva cauſa? </
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natam ſecundum C D, abripit, inflectitque ſecundum F G: </
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cunque Aquarum motus Fluidorumque decurſus cognoſcit, facile
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perſpiciet hoc phænomenon reſpuere omnes Fluidorum currentium
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Leges, & </
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cunque alio.</
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">Lamina ferrea, ſuper præſtantiſſimo ducta Magnete, viribus inſi-
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gnibus imprægnata fuit, hæc impoſita incudi, malleo aliquamdiu
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tuſa fuit, quo omnes amiſit a Magnete antea acceptas vires, non
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enim niſi leviſſimas ſcobis| particulas geſtabat, vi â pulſatione com-
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municata, qualem omne Ferrum malleis contuſum, acquirit; </
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nequaquam vel leviſſimam attollere potuit Acum.</
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ſe removentur, pori mutantur, aliarum partium fit contactus mu-
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tuus, nil aliud in Ferro mutatur, id tamen aptum eſt turbandis,
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& </
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pororum figura erit cauſa attractionis aut virtutis Magneticæ? </
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quaquam, quid enim porus eſt præter ſpatium vacuum, quod ſua
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natura eſt iners, ſed an, cum ſitus partium mutatus eſt, etiam non
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expulſa eſt vis, in quam cum Malleus egit, an non erit ſub-
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ſtantia corporea? </
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tur, ſed in diverſas ſubſtantias quomodo agat, non compre-
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hendi poteſt; </
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diſtinctiſſimam, an ſic mallei pulſatio non poſſet in vim Ma-
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gneticam agere, etiamſi hæc non foret ſubſtantia corporea, </
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