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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            <s xml:id="echoid-s1871" xml:space="preserve">
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            lum ſignum virtutis ederent; </s>
            <s xml:id="echoid-s1872" xml:space="preserve">itaque beneficio egregii Magnetis pul-
              <lb/>
            verem unum ex alio ſeparare nitebar, verum erat adeo homogeneus,
              <lb/>
            ut, totus quantus erat, attraheretur: </s>
            <s xml:id="echoid-s1873" xml:space="preserve">tum menſuravi ad quanmam
              <lb/>
            a Magnete diſtantiam attrahebatur, ut poſtea cognoſcerem, an quod
              <lb/>
            produceretur arte, vi majori an minori polleret: </s>
            <s xml:id="echoid-s1874" xml:space="preserve">pulverem immiſ-
              <lb/>
            ſum crucibulo, ſuperius aperto, in furno Anemi poſui, urſique ve-
              <lb/>
            hementi igne, excitato è carbonibus ligneis, quibus undique obrue-
              <lb/>
            batur, ſpatio trium horarum, quo toto tempore valde candeſce-
              <lb/>
            bat: </s>
            <s xml:id="echoid-s1875" xml:space="preserve">omnibus poſtea refrigeratis, examinanti quid in crucibulo e-
              <lb/>
            rat, apparuit pulvis idem, ejuſdem coloris, ac ante ignitionem:
              <lb/>
            </s>
            <s xml:id="echoid-s1876" xml:space="preserve">pulverem in crucibulo impactum antequam igni committebam, ob-
              <lb/>
            verti Verſorio 6 pollicum, gradatim propius admovendo, ut in qua-
              <lb/>
            nam diſtantia illud agitaret, accuratius intelligerem, diſtantiam
              <lb/>
            notaveram, nunc iterum crucibulum cum injecto pulvere Verſorio
              <lb/>
            eidem objeci, idque in eadem diſtantia, ac ante, attraxit: </s>
            <s xml:id="echoid-s1877" xml:space="preserve">Deinde
              <lb/>
            ſupra pulverem ex crucibulo excuſſum Magnetem tenui eundem, qui
              <lb/>
            in eadem diſtantia ac ante non attrahebatur quidem illico, ſed poſt-
              <lb/>
            quam per Minutum ſecundum unum alterumve exſpectaveram, tum
              <lb/>
            vero attractus fuit æque valide, quam ante Ignitionem.</s>
            <s xml:id="echoid-s1878" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s1879" xml:space="preserve">Ad pondus Magnetis ante & </s>
            <s xml:id="echoid-s1880" xml:space="preserve">poſt Ignitionem non attendi, quia
              <lb/>
            præcavere non poteram, quin cineres carbonum in crucibulum aper-
              <lb/>
            tum inciderint, qui pondus verum mutabant.</s>
            <s xml:id="echoid-s1881" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1882" xml:space="preserve">Ex hoc eventu igitur liquet vim attrahentem Magnetis non
              <lb/>
            facile penitus expelli poſſe ope Ignitionis, licet ea ex integro Magne-
              <lb/>
            te multum imminuatur, unde videtur, quando ad certum uſque gra-
              <lb/>
            dum vis periit, non ulterius eam ignitione paucarum horarum de-
              <lb/>
            creſcere; </s>
            <s xml:id="echoid-s1883" xml:space="preserve">quod oſtendit principium attractionis in Magnete non eſſe
              <lb/>
            admodum volatile.</s>
            <s xml:id="echoid-s1884" xml:space="preserve"/>
          </p>
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          <head xml:id="echoid-head48" xml:space="preserve">PROCESSUS SECUNDUS.</head>
          <p>
            <s xml:id="echoid-s1885" xml:space="preserve">Exploravi deinde, an principium attractionis Magneticæ non
              <lb/>
            volatile reddi poſſet, Magnetis pulveri admiſcendo corpora Sali-
              <lb/>
            na, quæ ſubtiliſſime omnia penetrare ſolent, & </s>
            <s xml:id="echoid-s1886" xml:space="preserve">ſecum abripere,
              <lb/>
            atque in altum elevare, quæcunque levia & </s>
            <s xml:id="echoid-s1887" xml:space="preserve">ſubtilia reddi poſſunt:
              <lb/>
            </s>
            <s xml:id="echoid-s1888" xml:space="preserve">Hunc in finem ſumſi Magnetis ejuſdem in pollinem reducti, & </s>
            <s xml:id="echoid-s1889" xml:space="preserve"/>
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