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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minus Ferri elevabit, gaudens tantum virtute, quam cum eo debi-
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lior Magnes communicaſſet.</
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ſum, vi attractrice imbuta fuerit, deinde reducatur dextrorſum,
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maximam virtutis partem, quam in priori tractu acquiſivit, amittet,
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ea quæ ſupereſt hæret in laminæ extremitate, quæ ultimo Magne-
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tem attigit.</
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<
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">Nunquam igitur Ferrum Magneti affricandum eſt, illud ducendo
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dextrorſum, & </
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<
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">reducendo ſiniſtrorſum, nam poſt plurimos ejuſ-
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modi itus redituſque Ferrum nihil virtutis accipiet: </
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<
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dam obſervavit Barlow, & </
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<
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<
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<
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madvertit præterea Eruditiſſimus Derhamus, Ferrum ita affrictum
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non in ſuis extremitatibus habere polos, ſed in centro, vel prope
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illud: </
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<
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">aliquando unum polum eſſe prope centrum, alterum ad alte-
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rutrum extremum: </
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Magnetis, ab altero ejus polo repelli: </
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ſemper inveniebat partem attrahentem prope centrum: </
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ſervavit ferramentis, vim directricem eſſe converſam, eorumque
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extrema attrahi & </
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let. </
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<
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ſecundum noſtram ponderandi methodum accuratiſſime cognitis, la-
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pidi affricentur plurima corpora ferrea, quæ vi Magnetica impræ-
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gnentur; </
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permanſerit, utrum decreverit: </
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ſine ullo decremento,</
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<
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nus in New. </
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qui mihi ſuum nonnunquam teſtatus dolorem, ſe ex Jobloti aſler-
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tis in errorem illapſum, contrarium ſuis inſeruiſſe ſcriptis, </
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