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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xml:space
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">PROCESSUS SEPTIMUS.</
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<
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">Magnetis in pulverem reducti & </
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<
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<
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xml:space
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">bene miſtas in
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crucibulo expoſui igni in furno anemi, per trihorium, in quo abie-
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runt in maſſam ſirmam, ſpongioſam, non ſplendentem, nigreſcen-
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tem, crucibulo adeo pertinaciter adhærentem, ut non niſi eo dif-
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fracto ſeparari potuerit: </
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<
s
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xml:space
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">hæc in pulverem contuſa a Magnete attra-
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hebatur, ſaporem parumper ſalſum retinuerat ab Alcali, in quod
<
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Nitrum in Igne converſum fuit: </
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<
s
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xml:space
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">cum Maſſa homogenei fuerat co-
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loris in hac prima operatione, nihil ſeparati diſtinctique dedit, quare
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illam alteri exponebam operationi.</
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<
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<
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">2. </
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<
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">Pulveri priori admiſcui Nitri æqualem copiam, atque eum in
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crucibulo per horas 2 {1/2} vehementiſſimo Igni carbonum foſſilium in
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furno reverberii expoſui; </
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<
s
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xml:space
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">tum abiit in maſſam valde friabilem, ſo-
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lisque digitis in pulverem conterendam, rubeſcentem, ſed ubivis
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homogeneam, nihilque diſtincti præbentem: </
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<
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">reduxi eam in pulve-
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rem, ſed qui parum a Magnete attrahebatur; </
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<
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xml:space
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">unde concluſiſſem
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partem viribus donatam cum Nitro avolaſſe, niſi certo certius ſci-
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viſſem, hoc tantum provenire a copia Salis, undique pulveri ad-
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hærentis, & </
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<
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">vim Magnetis in alia corpora prohibentis.</
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<
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">3. </
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<
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">Pulverem immiſſum phialæ cum Aqua digeſſi, coxique ſpatio
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8 dierum, obſervaturus an tincturam daret, ſed nullomodo ſol-
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vebatur: </
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<
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">tum pulverem in copioſiſſima diluebam & </
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<
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">lavabam A qua,
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donec inſipidus evadebat; </
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<
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">poſtea exſiccatus, manſit rubeſcentis
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coloris, & </
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<
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">multo fortius a Magnete attrahebatur quam antea in §.
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</
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<
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">imo dubitabam an in attractione differentia obtineret inter præ-
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ſentem & </
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<
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">eam ante inſtitutam ullam operationem cum pulvere.</
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</
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<
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<
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">Iterum ex hujus Salis operatione nihil ulterius ſperabam; </
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<
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equidem hujus corroſionem aliam fuiſſe, quam Salis Tartari,
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aut Salis Marini, quia pulvis alio colore donabatur; </
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<
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">nunc enim erat
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rubeſcens, quiantea gryſeus, rubeſcens, nigreſcenſque habebatur, ſed
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ita non ad ſcopum perveniebam: </
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<
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">quare ad aliud examen me ac-
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cinxi.</
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