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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evaſit pulvis nigri coloris, qui â Magnete attrahebatur; </
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<
s
xml:id
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echoid-s1972
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xml:space
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">ſed deinde
<
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hunc violentiori Igni expoſui in eodem crucibulo ſpatio unius horæ,
<
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prodiitque pulvis ex fulvo rubicundus, qui â Magnete fortiter at-
<
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/>
trahebatur, imo ad majorem diſtantiam, quam Magnetis pulvis
<
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ante ullam inſtitutam operationem.</
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>
<
s
xml:id
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echoid-s1973
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xml:space
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</
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<
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<
s
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xml:space
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">9. </
s
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<
s
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echoid-s1975
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xml:space
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">Quia non ſatis fortem ignem admoveram, repetiiExperimentum,
<
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/>
novum pulverem Magnetis cum Salis Ammoniaciæquali copia ſubli-
<
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/>
mando, & </
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>
<
s
xml:id
="
echoid-s1976
"
xml:space
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">in phiala fortiſſimo igni exponendo; </
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>
<
s
xml:id
="
echoid-s1977
"
xml:space
="
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">in hac operatione
<
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/>
Salem Ammoniacum reddidi penitus volatilem, qui ſecum elevave-
<
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/>
rat ad phialæ fornicem ex Magnete pulverem flavum, eundem,
<
lb
/>
quem in priori operatione ope Alcoholis vini & </
s
>
<
s
xml:id
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echoid-s1978
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xml:space
="
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">aquæ ſub forma
<
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Tincturæ collegeram: </
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>
<
s
xml:id
="
echoid-s1979
"
xml:space
="
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">remanſitque in fundo phialæ maſſa coloris ex
<
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/>
rubro fuſci, quæ in aëre aperto intra diem per deliquium ſolve-
<
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/>
batur.</
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>
<
s
xml:id
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echoid-s1980
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xml:space
="
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</
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<
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<
s
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echoid-s1981
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xml:space
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">10. </
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<
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echoid-s1982
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xml:space
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">Poſtea ſumſi Magnetis novi pulveriſati & </
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<
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xml:space
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">Salis Ammoniaci
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iterum ℨiij. </
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<
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xml:space
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">quas perfecte miſtas in crucibulo expoſui igni aperto in
<
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furno Anemi, ſpatio unius horæ, quo avolavit omnis Sal Ammonia-
<
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/>
cus, ſecum ſimul abripiens multum ex Magnete, relinquens tamen
<
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in fundo crucibuli pulverem roſei coloris, qui quidem attrahitur â
<
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Magnete, ſed parum, & </
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>
<
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echoid-s1985
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xml:space
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">modo in parvâ diſtantiâ.</
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<
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echoid-s1986
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</
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<
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<
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xml:space
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<
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xml:space
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">Quod ſi ad omnia, quæ in hoc Proceſſu occurrunt, atten-
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damus, patet in Magnete dari nonnullas partes, quæ citius red-
<
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di poſſunt volatiles, quam aliæ nam illæ, quæ colorem flavum
<
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conſtituebant in §. </
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<
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<
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derunt; </
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<
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xml:space
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">quæ vero coloris propius ad nigreſcentem accedentis erant,
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magis fixæ aut gravioresviſæ ſunt, cum in fundo phialæ remanebant:
<
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</
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<
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xml:space
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">Sed hac operatione non penetramus in artem ſeparandi ex Magnete
<
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partes inertes ab iis, quæ maxima virtute donantur, quia, quæ vo-
<
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latiles factæ ſunt, æque vim attractricem retinuerunt, quam fixiſſi-
<
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mæ, cum partes volatiles orbatæ tantummodo ab adhærente Sale
<
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iterum perfecte eandem, quam antea, vim Magneticam oſtende-
<
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runt, uti in §. </
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<
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<
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">videre licet.</
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<
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<
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">Mirandum tamen eſt, Tincturam Magnetis ſive cum Aqua,
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ſive cum Alcohole factam, exſiccatam, ut redierit in pulverem §. </
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</
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<
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xml:space
="
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">6, nullum indicium Attractionis habuiſſe, etiamſi Magnetem inſe
<
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contineat, qui poſt ulteriorem ignis actionem perpeſſam, ſuas </
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