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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<
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">PROCESSUS OCTAVUS.</
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<
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">Sumebantur Magnetis in pulverem fracti & </
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">Salis Gemmæ ana
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ℨiij. </
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<
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">ambos pulveres diu inter ſe contritos & </
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<
s
xml:id
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xml:space
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">optime miſtos immiſi
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crucibulo, quod expoſitum fuitigni in furno Anemi, per trihorium;
<
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</
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<
s
xml:id
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xml:space
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">tum refrigeratis omnibus maſſa dabatur firma, crucibulo valde ad-
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hærens, ubivis interſperſa puncta micantia habens, quæ per Mi-
<
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croſcopium conſpecta, erant modo partes Salis Gemmæ pellucidiſ-
<
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fimæ in ſuperſicie maſſæ color ferreus apparebat, ex quo plurimum
<
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Ferri in hac maſſa hærere ſuſpicabar, in parte inferiori erat maſſa-
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aſpera, & </
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<
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">multo nigrior. </
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<
s
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xml:space
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">Non poteram pro voto partem ſupe-
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riorem ſeparare ab inferiori, quod ſperabam me melius facturum,
<
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ſi ſecundæ operationi maſſam committerem: </
s
>
<
s
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xml:space
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">Eam igitur prius in
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pulverem redegi, qui ſaporem acrem ſalſumque retinebat, atque a
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Magnete fortiter attrahebatur.</
s
>
<
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</
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<
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">2. </
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<
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">Huic pulveri iterum addidi Salis Gemmæ, æqualem copiam,
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& </
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<
s
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xml:space
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">ut ante in crucibulo commiſi Igni vehementiſſimo, in furno Ane-
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mi, per 2 {1/2} horas, maſſa refrigerata erat firma, cujus ſtratum ſuperius
<
lb
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colorem Ferri æmulabatur, pars inferior erat ſpongioſa, rufa, mol-
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lior; </
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>
<
s
xml:id
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xml:space
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">ambo hæc ſtrata a ſe mutuo ſeparata redegi in pulverem;
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</
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<
s
xml:id
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xml:space
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">pulvis ſtrati ſuperioris multo vehementius a Magnete attraheba-
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tur, quam ſtrati inferioris; </
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<
s
xml:id
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echoid-s2113
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xml:space
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">imo erant in ſtrato inferiori plu-
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rimæ partes, quæ non a Magnete attrahebantur, cum e contrario
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omnes in ſtrato ſuperiori alliciebantur.</
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<
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">3. </
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<
s
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">Erat itaque multum in ſtrato inſeriori, ſimile illi, quod in ſtrato
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ſuperiori deprehendebatur, hinc quicquid a Magnete attrahebatur,
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eliciebam ex ſtrato inferiori, addidique pulveri ſtrati ſuperioris:
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</
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<
s
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xml:space
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">huic iterum admiſcui copiam Salis Gemmæ æqualem, quam immiſ-
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ſam crucibulo, impoſui Igni fortiſſimo rotæ, excitato ex Carbo-
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nibus ligneis & </
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>
<
s
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">foſſilibus, continuatoque per 4 horas; </
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<
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xml:space
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">maſſa dein-
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de refrigerata exhibebat ſubſtantiam nigram non multum cohæren-
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tem, valde friabilem, ſed homogeneam: </
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<
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xml:space
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">adhærebant lateribus
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crucibuli pelliculæ metalli alicujus, ſed mihi incogniti, argentei
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coloris, ſplendentes, quæ nullo modo a Magnete attraheban-
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tur: </
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<
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">maſſa tota erat in hac operatione valde imminuta, adeo </
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