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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pars magna tum Salis, tum Magnetis avolaverit, non tamen omnis
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Sal abierat, quippe ſapor ſalſus maſſæ manifeſtus inerat: </
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<
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bus tenuiſſime contuſis vis parva Magnetis obſervabatur, uti quidem
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ante ſuſpicatus eram, quia Sal undequaque penetraverat in partes
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Magneticas, cum quibus vehementer cohærebat, adeo ut vis for-
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tiſſimi ignis tamdiu continuati eas a ſe avellere non potuerit: </
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<
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id quod Ignis præſtare nequit, aqua facile abſolvit.</
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<
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exceſſum unius digiti, qua cum digeſſi per octiduum, viſurus an
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tincturam præberet; </
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<
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">ſed nullam dedit, ſolummodo Sal Gemmæ
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reſiduum fuit in aqua ſolutum, eo cognito, pulverem lavi copio-
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ſa aqua, uſque dum inſipida redibat; </
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<
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xml:space
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">pulvis exſiccatus, erat ni-
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grioris coloris, quam pulvis Magneticus ante operationem; </
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xml:space
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">& </
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<
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xml:space
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">at-
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trahebatur a Magnete fortius quam unquam antea; </
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<
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xml:space
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">quod evincebat
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Salem admiſtum impediviſſe actionem ejus Magneticam; </
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xml:space
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<
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Terram inertem fuiſſe ſeparatam ex Magnetis ſubſtantia; </
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<
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dubio in §. </
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reſidua adhuc multum materiæ inertis contineretur, quæ ulteriori-
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bus operationibus diutiſſime continuatis poſſet ſeparari ab omni effi-
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caci, verum non ſatis otii fruebar, ut id ulterius indagarem; </
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<
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tius ad alias methodos feſtinavi, ſperans me facilius voti compotem
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futurum. </
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<
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">Id tamen ex hiſce omnibus tentaminibus colligitur, vim
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Magnetis ex Magnete non poſle tam facile expelli omnem, uti cre-
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diderunt antea Philoſophi, videntes Magnetem magnum & </
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grum in Igne corrumpi, ſuaſque vires amittere; </
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omnes amittit, & </
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ex his huc uſque expoſitis patet tentaminibus, & </
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<
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etiam ulterius liquebit.</
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">Deſiderio flagrabam explorandi, an Magnes in vitrum converſus
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vim attrahendi retineret, quoniam vitriſicatio eſt ultimus finis ope-
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rationum Chemicarum, & </
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tem per ſe, aut ope Borracis ſolius non in vitrum mutaveram hacte-
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nus, licet diu & </
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