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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<
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& </
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diſtantiam quam Limatura Ferri recens: </
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<
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xml:space
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que Sulphur, neque Salem Ferri eſſe materiam attractioni propriam,
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ſed aliquam aliam, quæ eo fortius attrahitur, quo accuratius orbata
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eſt Sulphure & </
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</
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<
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<
s
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xml:space
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trum abire ſuperius monui, & </
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<
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xml:space
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<
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xml:space
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ſeparanda erat ab hac terrâ inerti, quantum poterat; </
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<
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fui Cl. </
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<
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xml:space
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">Lemmerium, qui ad pulverem redactæ materiæ affudit Spi-
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ritum Nitri; </
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<
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xml:space
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ad ſuperficiem abibat in pulverem album, pinguiuſculum, qui ſæ-
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pe aliquamdiu candorem retinet, aliquando fulvus fit; </
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<
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collectus ſeorſim, & </
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<
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xml:space
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">prope exſiccatus attrahitur vi majori adhuc a
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Magnete vel a lamina Chalybea, quam maſſa præcedens attracta
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fuit: </
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<
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xml:space
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">videtur hoc corpus id ſolum eſſe, quod in Ferro cauſa attractio-
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nis exiſtit, quodque miſtum cum aliis corporum generibus, ut Fer-
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rum conſtituat, agere impeditur aliquomodo.</
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<
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">Forſitan ſimile aut idem corpus in Magnete eſt ſolum id, quod at-
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tractionem in eo excitat, quod quo purius eſt & </
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<
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te, eo Magnetem præſtantiorum virium facit: </
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nus colligi poteſt ex Magnetibus, qui tempore generantur in aëre ex
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Ferro: </
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cum materia terreſtri, Sulphur miſcetur cum Salibus per aërem na-
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tantibus, & </
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ponentia: </
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<
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<
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tur materia Magnetica ſimul cum pluvia ingreditur poros lapidis,
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cui Ferrum inhæret, eos in veros Magnetes mutat, quos, expe-
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rientia teſte, deprehendimus perpetuo ubicunque modo Ferrum aëri
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diu expoſitum lapidique infixum ſpongioſo fuerit.</
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vi Magnetica, eandemque retineat, quam Ferrum: </
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antequam uſibus convenit, aliquoties eſt igniendus & </
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Igne certo certius deponens aliquantum ſui Sulphuris vel Olei, unde
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nunquam tam flexilis eſt poſtea, quam Ferrum, tum igitur Chalybs
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depuratur magis ab heterogenea materia adhærente, & </
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