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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VII. </
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dari magnam: </
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">quod autem nonnullos attinet numeros, qui paulum
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diſcrepant, & </
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">variam dari Attractionem hinc inde oſtenderent, ſcien-
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dum eſt, nunquam tam accurate in totidem Experimentis dirigi poſſe
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Magnetem ſuſpenſum ex fune, ut eædem plagæ ſuperioris ſpectent
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eaſdem inferioris Magnetis, unde oritur quædam Attractionis di-
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verſitas, malui autem candide obſervationes cum ſuis Anomaliis
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apponere, quam nonnullas corrigere aut immutare, quod ſi enim
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aliquis eadem repetat Experimenta, facile obfervabit, non poſſe
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dexteritate quâcunque eadem reperiri in omnibus diſtantiis Magne-
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tum a ſe invicem Attractio, quia converſo per evolutionem funis
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H G vel tantillum Magnete H ex priori ſitu, extemplo alia vis at-
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tractrix N O verſus obſervatur.</
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<
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">Liquet igitur ex his Experimentis Metalla non remorari vires Ma-
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gneticas, neque eas imminuere aut turbare: </
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reſpectu Effluviorum Magneticorum, quod ſunt vitra, & </
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corpora reſpectu Lucis, quæ hujus maximam per ſe tranſmittunt
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copiam, idcirco cum aliis corporibus ſolidis ſimilia inſtituenda ad-
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hucdum eſſe Experimenta ratus fui, hæc enim poſſent eſſe ita com-
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parata cum Effluviis, quemadmodum opaca ſunt reſpectu Lucis: </
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cluſus fuit Magnes capſulæ ex terra porcellanica Chinenſi confectæ;
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</
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">poſtea incluſus fuit capſulæ vitreæ, atque in hoc duplici tentami-
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ne eodem modo vires exploratæ fuerunt ac in Experimento præce-
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denti, ſed utraque capſula nullam viribus Magneticis intulit moram,
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decrementum nullum; </
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">æque facile hæ per utramque tranſiverunt,
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ac ſi ambo Magnetes abſque ullo intermedio obſtaculo ſe ſpectaſſent. </
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Immiſſus tandem fuit Magnes recipienti Boyleano, atque ex eo
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omnis, quantum fieri poteſt ope Antliæ Pneumaticæ, eductus
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aër elaſticus, alter Magnes, & </
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ſpenſus, ad varias demiſſus diſtantias, iiſdem attrahebatur viribus
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ac in primo Experimento, poſitis ambobus Magnetibus in aëre aper-
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to: </
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ſimilis Experimenti adnotaſſe in Continuat. </
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Exper. </
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potuit, tum ex unco recipientis ſuſpendit, aërem Antliâ eduxit; </
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quo ſublato Magnes aliquamdiu Ferrum geſtavit, ſed poſtea demiſit
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