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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DE MAGNETE.
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attrahebatur, niſi in immediato contactu: </
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<
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">adeo ut vis Magnetica fere
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penitus in hoc reſiduo pulvere ſileat, quod ſequenti operatione
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exploravi.</
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<
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">3. </
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">Hunc pulverem in crucibulo commiſi Igni in furno Anemi per
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horam unam, evaſit pulvis rubicundus, lætioris ruboris, quam
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creta rubra eſſe ſolet; </
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<
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xml:space
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">hic oppoſitus Verſorio 6 pollicum, id nequa-
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quam attraxit, aut movit, nec ullomodo â polo Magnetis for-
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tiſſimi attractus, vel tantillum motus fuit.</
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<
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<
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">Hæc igitur fuit Terra iners Magnetis, in qua nulla virtus ſuper-
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ſtes erat; </
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<
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xml:space
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">hanc Spiritus Nitri proinde non ſolvit, ſed modo illud
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ex Magnete elicit, quod virtutem habet.</
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">Idcirco Tincturam exſiccavi, quæ præbuit plurimum ſubſtan-
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tiæ rubræ inſtar Colcotar vitrioli: </
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<
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xml:space
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">hæc in pulverem redacta non
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attrahebatur a Magnete, quod mirabar primum, opinatus vim Ma-
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gneticam penitus eſſe in hac operatione deſtructam; </
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<
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">ſed judicium
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ſuſpendebam detegens ex ſapore, pulverem abundare Sale acido in
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evaporatione relicto & </
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<
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">qui eaſdem fabulas cum reliquis Salibus agere
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poſſet: </
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<
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">idcirco pulverem in crucibulo expoſui igni fortiſſimo rever-
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berii per bihorium, & </
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<
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xml:space
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">recepi pulverem, copiâ vix imminutum, co-
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loris fulvi, inſipidum, qui vehementiſſime â Magnete attrahebatur,
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fere tam fortiter, quam limatura Ferri, quæ fortius â Magnete attra-
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hitur, quam Magnes in pulverem minutus: </
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<
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">Vere igitur dixerim me
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hoc modo ſeparaſſe ex Magnete partem aliquam intertem ex eâ, quæ
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virtute pollet; </
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<
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">ſed hæc pars non niſi mera eſſe terra videbatur, quam
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aliis viis forte immutare, forte non poſſem; </
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">Sublimavi eam
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quidem cum Sale Ammonico, qui penitus volatilis eſt factus ipſa
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manente fixa, & </
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<
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">coloris multo obſcurioris, quam antea fuerat, Sal
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nihil ex ipſa reddidit volatile: </
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<
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xml:space
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">poſtea materiam Magneticam lavi atque
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edulcoravi aqua, ut ſi quid Salis a prioribus operationibus relictum
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fuiſſet, id omne omnino tolleretur, pulvis exſiccatus colorem re-
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ferebat obſcurum, qui a Magnete in initio parum attrahebatur,
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ſed qui cum ſemel vim Magnetis leniter ſupraducti ſubolfecerat,
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vehementiſſime omnium pulverum attractus fuit, atque ad notabi-
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lem a Magnete diſtantiam elevabatur: </
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<
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">Si hujus examini plus incum-
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beremus, forſitan aliquid, quod labores penſaret, invenerimus;
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