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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hæc tentamina operoſiora viderentur, facilius demonſtrabitur Ma-
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gnetem non tantundem ferri calefacti, quam frigidi attrahere, aut
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ſibi applicatum ſuſtinere, ſi ipſi, aut inermi, aut armato, prius appen-
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ſum fuerit ferrum frigidum tanti ponderis, quantum vix elevatur,
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id enim poſtea calefactum & </
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">denuo appoſitum non a Magnete feretur.</
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<
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æquali vi operari quam in frigidum: </
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<
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">tres Magnetes compactæ ſub-
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ſtantiæ igni immiſit, donec rubebant, calefactos argenteæ lamel-
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læ impoſuit, inſra quam alter locatus Magnes attrahebat quidem
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ignitos, ſed imbecillius, increſcente tamen continuo attractione,
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prout magis refrigerabantur Magnetes.</
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Lib. </
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<
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">de Magnete, operationem Magnetis in fer-
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rum frigidum & </
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">ignitum eſſe penitus eandem: </
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">in errorem incidiſſe
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videtur vir Magnus, quod rudiori modo experimenta ceperit, fer-
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rum ignitum applicando tantum Magneti armato, id enim quidem
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attrahitur, ſed nunquam tantis viribus, quam ferrum frigidiſſi-
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mum.</
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">An hinc non intelligitur Magnetem minori vi ferrum, æſtivo
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calore imprægnatum, attracturum, quam quando hyemali frigore
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riget & </
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cunque vi Magnetica imprægnari quando refrigeratur; </
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">Ignem eandem vim, aut majorem cum Ferro a Magnete com-
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municatam expellere; </
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">ideo Ferrum candidiſſimum, magnâ parte vir-
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tutis attrahentis ſpoliatum, nequit â Magnete tanto cum impetu
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attrahi, quam frigidum, vi donatum Magneticâ: </
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<
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vibratorius, quo igniti ferri partes contremiſcunt, vires Magneti-
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cas impediunt, irritasque reddunt: </
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<
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ſet, quomodo Ignis in has vires operetur, verum quia nondum ex-
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plicui, quomodo hæ comparatæ ſint, an corporeæ, an alterius
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indolis? </
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aliquem impendiſſe laborem.</
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