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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">Quoniam plurimorum Eruditorum animis inſedit opinio, effectus
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Magnetum in ſe mutuo pendere ab Effluviis ſubtilibus ab omni late-
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re continuo egredientibus, aut a fluido Æthereo Magnetes undiqua-
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que ambiente, premente aut propellente tum eos ſe invicem verſus,
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tum Ferrum, tum alia Corpora, quæ ab iis attrahuntur, ſedulo in-
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veſtigavi, quibusnam innixa argumentis hæc opinio foret; </
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<
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ti apparuerunt nulla, aut adeo imbecillia, ut temeritatis merito ar-
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guerer, ſi abſque aliis, firmioribusque ratiociniis Effluvia Magneti-
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ca, aut Æthereum fluidum cauſam effectuum Magneticorum ſtatuiſ-
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ſem: </
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<
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">poſtquam vero manum operi admovendo, Effluvia aut Æthe-
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rem quærere incepi, nulla ſeſe obtulerunt Experimenta, ex quibus
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vel minima eorum ſuſpicio foveri poſſet, è contrario ea prodierunt
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data, quæ me penitus convicerunt, nec Effluviis nec Æthere regi
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Magnetes, nec poſſe. </
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">Ut hoc clare appareat, ſupponamus ex Ma-
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gnete Effluvia exire, quæ effluendo repulſionis, & </
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<
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">affluendo attra-
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ctionis ſint cauſæ, atque ante oculos poſitum fingamus Magnetem
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ſuſpenſum ex libra accuratiſſima, in Tab. </
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<
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<
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">alterumque in-
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fra ipſum ſupra menſam locatum; </
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<
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">Effluvia ex utroque libere egre-
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dientur, regredientur, atque vi maximâ ſe Magnetes at-
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trahent: </
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<
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">verum concipiamus nunc corpus ſolidum denſumque
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inter eos interponi, an Effluvia utriuſque Magnetis in hoc non incur-
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rent, nonneintercipientur, & </
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<
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">aliorſum determinabuntur, atque ita At-
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tractio aut Repulſio ſublata erit? </
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<
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">novi equidem regeri poſſe, omnia
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corpora eſſe admodum poroſa, Effluvia valde ſubtilia, ita ut poros fa-
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cile permeare poſſint, atque Attractionem & </
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do obſervandam eſſe, ac ſi nihil inter Magnetes fuiſſet interpoſitum:
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</
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<
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">concedendum eſt, firma quæcunque corpora plurimis eſſe pertuſa po-
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ris, nihilominus conſtant ex plurimis quoque partibus ſolidis, im-
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penetrabilibus, & </
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moventur: </
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<
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">quo corpora graviora ſunt, eo ſunt ſolidiora, & </
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nus poroſa, hæc intercipient longe plura Effluvia aliorum corporum,
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utcunque ſubtilia fuerint: </
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ros vitrorum, metallorum, ſaxorum, aliorumque ſolidorum </
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