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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renatum erat, quod cultro hinc inde ſeparatum ab alia materia,
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erat purum Plumbum: </
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<
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xml:space
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">Alia autem duriorque maſſa, in pulverem
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trita, a Magnete æque fortiter attrahebatur, quam ipſa Arena In-
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dica, pulvis tamen minus ſplendebat, nec erat tam atri coloris:
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<
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re. </
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<
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">Cum vero ſolet Minium cum Arena vulgari aut ſilice abire in
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vitrum, uti quoque ſupra demonſtravimus Magnetem ipſius ope in
<
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vitrum mutari, manifeſtum eſt, hanc Virginiæ Arenam non eſſe ter-
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ram facile penetrabilem aut ſolubilem ab eo metallo, quod iguitum per
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omnia fere tranſit alia corpora: </
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<
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xml:space
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">non tamen eſſe ſubſtantiam ſimpli-
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cem, docuit vis Salis Ammoniaci & </
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<
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<
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tem componatur partibus ſimplicioribus nondum deprehendere po-
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tui.</
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">Magnes ex fodinis erutus, non ſolet multum Ferri elevare atque
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geſtare, ideo armatura induitur, qua adjutus multo plus ferreipon-
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deris gerit, hæc enim ejus vires, cæteroquin quaquaverſum dif-
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fundendas colligit, dirigit, condenſat, atque eas amborum polo-
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rum congregat, ut in eandem agant molem ferream, eamque ſimul
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trahant: </
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<
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quæ huc uſque innotuit, hanc tamen eſſe abſolute perfectiſſimam
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non niſi temere affirmarem.</
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<
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<
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ex fodina erutam proponi, quæ ita ſit armanda, ut plurimum Ferri
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elevet geratque: </
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Martis, atque ita invertatur, donec duas exhibeat plagas, ſibi op-
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poſitas, quæ limaturam in ſeries rectas ordinant. </
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<
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Magnetis poli, qui accuratiſſime determinabuntur, Acu brevi gra-
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cilique iis impoſita, quæ perpendiculariter polis inſiſtit, oblique
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inflexa & </
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<
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dem aſperum, lævigentur & </
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lelis, & </
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