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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elevaturum: </
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">Dechales contrarium quidem ſtatuit, niſi forte de vi-
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ribus Magnetis, cum Chalybe in majore quantitate communica-
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tis hæc opinatus fuerit, uti in præcedenti Experimento monitum
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fuit.</
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quam alii: </
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<
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">neque illi, qui fortiſſime trahunt magnam Ferri molem,
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aut qui maximi ſunt, ſemper tantum virtutis dant Ferro, quam par-
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vi debileſque.</
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<
s
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xml:space
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">Hoc diu obſervaverunt omnes fabri Acuum nauticarum, idcirco
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ſemper quærentes Liberales, ut vocant, Magnetes, licet non ma-
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gnam molem Ferri attrahant: </
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<
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xml:space
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">Experimentum cepi cum Magnete
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præſtantiſſimo, ſuam virtutem manifeſto ad 14 pedum Rhenolandico-
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rum diſtantiam exſerente, qui ſi bene armatus fuiſſet, forte 50 Li-
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bras & </
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<
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">ultra, ferri, geſtaſſet. </
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<
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">Hujus polo Boreali lamellæ ferreæ
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affrictæ ſunt, quarum vis, appendendo extremitatibus ponduſcula,
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explorata fuit: </
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<
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xml:space
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">his deinde ignitis, ut vi accepta orbarentur, a Ma-
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gnete parvo debilique, qui tantum Libras 4 elevabat, communica-
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ta fuit vis attrahens multo major: </
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<
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">inſtituens hoc Experimentum cu-
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ravi, ut ſuper polis cognominibus utriuſque Magnetis Ferrum du-
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ceretur, cum æquali celeritate, eadem appreſſione, & </
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repetitionibus, cæteroquin nihil accurati concludi potuiſſet: </
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">Whiſtonus idem confirmat tam ex ſua experientia, quam ex ea
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præſtantis Fatii, & </
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xml:space
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tem vibrationum, quibus eadem Acus oſcillabat affricta diverſis Ma-
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gnetibus; </
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<
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">atque ita ſimul adnotavit vim directricem non melius im-
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pertiri Acui a Magnete magno quam ab exiguo: </
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<
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plerumque Magnetes fortiores plus virium cum Ferro communicare
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quam debiliores:</
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<
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">Ex hoc Experimento videtur ſequi, vires in omnibus Magneti-
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bus non eſſe eodem modo comparatas, has melius a Ferro recipi
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poſſe aliis: </
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<
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xml:space
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">Nam probabiliſſimum eſt Magnetem fortiſſimum plures
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vires ex ſe emittere, quam debilem, quomodo enim poſſet alio-
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quin fortiſſimus eſſe, ſive maximam Ferri quantitatem geſtare, </
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