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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          <p>
            <s xml:id="echoid-s1847" xml:space="preserve">
              <pb o="77" file="0091" n="91" rhead="DE MAGNETE."/>
            ſem, ſperabam me acquiſiturum partes inertes nullaque vi donatas
              <lb/>
            attractrice, aliaſque in quibus omnis vis hæreret; </s>
            <s xml:id="echoid-s1848" xml:space="preserve">ex quibus Mi-
              <lb/>
            croſcopio, vel alia methodo examinatis, quænam fabrica Magne-
              <lb/>
            tis, & </s>
            <s xml:id="echoid-s1849" xml:space="preserve">cauſa virtutis foret, detegeretur: </s>
            <s xml:id="echoid-s1850" xml:space="preserve">Omnem igitur huc direxi
              <lb/>
            animi meditationem, ut Magnetem, quem corpus compoſitum
              <lb/>
            tum ex aliis ſupponebam, in ſua ſimpliciora diſſolverem: </s>
            <s xml:id="echoid-s1851" xml:space="preserve">Boyleus
              <lb/>
            in his Tentaminibus mihi aliquomodo præiverat, ſed tam paucos
              <lb/>
            progreſſus faciendo, & </s>
            <s xml:id="echoid-s1852" xml:space="preserve">nequaquam ſatis ſollicita inſtituendo exa-
              <lb/>
            mina, ut ex Boyleanis nihil vel parum lucis foenerari potuerim:
              <lb/>
            </s>
            <s xml:id="echoid-s1853" xml:space="preserve">addenda autem illa noſtris judicavi, quia paucis comprehendi poſſunt. </s>
            <s xml:id="echoid-s1854" xml:space="preserve">
              <lb/>
            Candefecit Philoſophus diverſos Magnetes in Igne, tum in eo-
              <lb/>
            rum ſubſtantia magnam animadvertit heterogeneitatem: </s>
            <s xml:id="echoid-s1855" xml:space="preserve">Nonnulli
              <lb/>
            inter refrigerandum cadebant in pulverem; </s>
            <s xml:id="echoid-s1856" xml:space="preserve">alii friabiles evadebant; </s>
            <s xml:id="echoid-s1857" xml:space="preserve">
              <lb/>
            alii integri perſtabant; </s>
            <s xml:id="echoid-s1858" xml:space="preserve">alii diffracti intus apparebant inſtar ſquam-
              <lb/>
            marum Ferri; </s>
            <s xml:id="echoid-s1859" xml:space="preserve">alii referebant lamellas colore variegatas, ſibi mutuo
              <lb/>
            parallelas; </s>
            <s xml:id="echoid-s1860" xml:space="preserve">alii vix apparebant mutati colore & </s>
            <s xml:id="echoid-s1861" xml:space="preserve">ſoliditate.</s>
            <s xml:id="echoid-s1862" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1863" xml:space="preserve">Nulli horum in Igne flammam cæruleam, quæ indicium præſen-
              <lb/>
            tis ſulphuris foret, emiſerunt, etiamſi id affirmet Del Porta, ſup-
              <lb/>
            ponens vim Magneticam in Sulphure conſiſtere. </s>
            <s xml:id="echoid-s1864" xml:space="preserve">Ex qua diverſiſ-
              <lb/>
            ſima Magnetum igni commiſſorum forma conſtat, varias ad eos
              <lb/>
            componendos concurrere ſubſtantias, quarum nonnullæ plus, aliæ
              <lb/>
            minus volatiles fiunt. </s>
            <s xml:id="echoid-s1865" xml:space="preserve">Sed ad Analyſin Magnetis properemus,
              <lb/>
            diverſiſſimas ineundo vias, ut, quod una non eruitur, altera in-
              <lb/>
            veniatur.</s>
            <s xml:id="echoid-s1866" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div39" type="section" level="1" n="39">
          <head xml:id="echoid-head47" xml:space="preserve">PROCESSUS PRIMUS.</head>
          <p>
            <s xml:id="echoid-s1867" xml:space="preserve">Quia Magnes integer in Igne aliquamdiu toſtus, vim attrahendi
              <lb/>
            Ferrum eo uſque amittit, ut limaturam non attrahat, attamen agat
              <lb/>
            in Verſorium 6 pollicum Magneticâ vi imbutum; </s>
            <s xml:id="echoid-s1868" xml:space="preserve">exploravi, an non
              <lb/>
            poſſet penitus omnis vis attractrix expelli; </s>
            <s xml:id="echoid-s1869" xml:space="preserve">quod facilius videretur
              <lb/>
            poſſe fieri, quando Magnes in pulverem ſubtiliſſimum prius redu-
              <lb/>
            ceretur, tumque igni committeretur. </s>
            <s xml:id="echoid-s1870" xml:space="preserve">idcirco Magnetem elegi bo-
              <lb/>
            num, præſtantiſque virtutis, nigreſcentis coloris, qui in mor-
              <lb/>
            tario in pulverem ſubtiliſſimum contuſus fuit: </s>
            <s xml:id="echoid-s1871" xml:space="preserve">ſuſpicabar in hocpul-
              <lb/>
            vere datum iri partes, quæ â Magnete attraherentur, alias, quæ </s>
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