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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DEMAGNETE.
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ſervatum eſt habuiſſe quatuor polos, duos Boreos B, B, duos
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Auſtrales M, M: </
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<
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">alium examinavi Magnetem, qui in omni fe-
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re puncto ſuæ ſuperficiei polo donatus videbatur, & </
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<
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vim attrahendi fere æqualem exercebat: </
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<
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xml:space
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">Verum hi ſunt Magnetes
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Anomali, minima tamen pars eorum duobus gaudet polis ſibi directe
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oppoſitis, de Regularibus Magnetibus in ſequentibus modo agam.</
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">Magnes parvæ impoſitus Cymbæ ligneæ, ut Aquæ in vaſe am-
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plo innater, jaceatque axe ad horizontem parallelo, ſeconvertet, do-
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nec ſuis polis reſpiciat determinatas cæli plagas, quarum una in hac
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Regione eſt utcunque Borea, altera utcunque Auſtralis.</
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<
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<
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">Minus exactè loquuntur, nec accuratas inſtituerunt obſerva-
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tiones, qui Magnetem ſe ad Boream & </
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<
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xml:space
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">Auſtrum convertere dixe-
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runt, inferius enim liquebit pauca tantum in hoc terrarum orbe nunc
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dari loca, in quibus Magnes accurate Boream Auſtrumque ſpectat,
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nam ſunt modo tres Meridiani ejuſmodi hucuſque cogniti; </
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<
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id annotaſſe pro hoc Experimento, mox enim prolixius de iis age-
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mus.</
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<
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<
s
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">Non requiritur, ut Cymbæ innatet Magnes, cujus directionem ex-
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ploramus, ea enim obſervatur quoque, ſuſpenſo Magnete ex filo ſeri-
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ceo tenui, non intorto, ſed texto, ejuſque axe ad horizontem parallelo:
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</
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<
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">Neque differentia obſervatur, ſive ſit Magnes grandis, ſive exiguus,
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ſive unitus, ſive in partes diſſectus, omnes quippe ejus particulæ
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eâdem directione aguntur.</
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">Polus Magnetis, Boream ſemper ſpectans, vocatur
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Boreus, qui Auſtro obvertitur polus Auſtralis.</
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ipſo ducti, directio ad plagas Cæli Boreas & </
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</
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<
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">quando a nautis cœpit in uſum vocari, aptarique Acus in for-
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mam Compaſſi, maritimis accommodati uſibus. </
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quem caſu primum inveniſſe Magnetis impoſiti cymbulæ, natanti
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in Aqua, alterum polum conſtanter dirigi Boream verſus, alterum
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Auſtrum verſus: </
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">deinde Ferrum Magneti aſſrictum in ſimili cym-
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bula agi eâdem directione: </
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