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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10692DISSERTATIO ram, quâ effuſâ, rurſuſque reſiduo aquâ, additâ, Tincturamque no-
vam elicui, id repetens, quamdiu Tinctura oriebatur.

5. Omnes Tincturæ in vaſe commiſtæ per triduum, acquire-
bant in ſuperficie pelliculam, quæ cryſtallorum eſt ſpecies, conſta-
batque ex fibris rectiſſimis, tenuibus, ſibique perfecté parallelis:
interim ſubſedit pulvis flaveſcens ad fundum vaſis, quem collegi,
lente & caute prius educta aqua: pulvis hic exſiccatus erat flavi
coloris, ſaporis ſalſi, acidi, ſed valde adſtringentis, qui nequa-
quam a Magnete attrahebatur.

6. Alter pulvis nigreſcens, qui poſt digeſtionem & ablutionem
cum aqua ſubſederat in §. 4, exſiccatus leniter, nullomodo ab ar-
mato Magnete attrahebatur: Hunc itaque in crucibulo per bihorium
Igni fortiſſimo reverberii commiſi, frigefactus colorem nigrum ha-
bebat, ſed continebat parva fruſta duriſſima, quæ in Igne coalue-
rant, quaſi metallum continerent; Totus hic pulvis a Magnete ite-
rum attrahebatur, apparebat tamen vis in initio minor, quam pul-
veris Magnetici ante actionem ullam Ignis.

Ecce Magnetem perfecte ſolubilem in menſtruo; in quodigitur ve-
hementer operatur ſua viattrahente, cum omnis ſolutio corporum in
menſtruo ab ejuſmodi vi, reciproca inter hæc ambo, dependeat: unde
mirum non eſt, vim Magneticam non apparere in alia corpora, quam-
diu menſtruum adeſt, quod in Magnetis partes tam vehementer ope-
ratur: Verum menſtruo expulſo redeunt in conſpectum Vires, præ-
cipue altero Magnete appoſito.

PROCESSUS DUODECIMUS.

Sumſi Spiritum Nitri more Glauberiano confectum ad ℥iij, cui
in Phiala alta immiſi ℨiij. Magnetis in pulverem comminuti, vix
efferveſcentia oborta fuit; digeſſi hæc ſpatio 16 dierum, eliciebatur
Tinctura, perfecte pellucida, ſpiſſa tamen, coloris ex viri-
diuſculo flaveſcentis; remanente in fundo phialæ pulvere non ſo-
luto.

2. Tincturam leniter effudi, pulveremque reſiduum & non ſo-
lutum exſiccavi; qui deinde oppoſitus polo Magnetis præſtantiſſimi,
hinc inde parte aliqua ſimulabat, quaſi vellet attrahi, attamen

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