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-s2016" xml:space="preserve">
              <pb o="84" file="0098" n="98" rhead="DISSERTATIO"/>
            arcte cohærens cum crucibulo, ſpongioſa, cujus pars ſuperior co-
              <lb/>
            lorem gryſeum, inferior rufeſcentem habebat: </s>
            <s xml:id="echoid-s2017" xml:space="preserve">ambas diverſi co-
              <lb/>
            loris partes a ſe ſollicite ſeparavi, ſperans me hoc modo ex Magne-
              <lb/>
            te ſejunxiſſe iners ab attrahenti; </s>
            <s xml:id="echoid-s2018" xml:space="preserve">maſſa utraque in pulverem reda-
              <lb/>
            cta a Magnete attrahebatur, gryſea tamen fortius, rufa debi-
              <lb/>
            lius.</s>
            <s xml:id="echoid-s2019" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2020" xml:space="preserve">3. </s>
            <s xml:id="echoid-s2021" xml:space="preserve">Ex quo progreſſu concludebam Magnetem eſſe revera corpus
              <lb/>
            aliquod compoſitum ex terra nigra, inerti, & </s>
            <s xml:id="echoid-s2022" xml:space="preserve">ex aliqua alia mate-
              <lb/>
            ria, in qua vis potiſſimum reſidet; </s>
            <s xml:id="echoid-s2023" xml:space="preserve">ſed hæc tenaciſſime adhæret ſuæ
              <lb/>
            Terræ, atque ideo nondum in hac operatione ſeparata penitus fuit;
              <lb/>
            </s>
            <s xml:id="echoid-s2024" xml:space="preserve">tum enim in Terra nihil virium deprehendi debuiſſet, & </s>
            <s xml:id="echoid-s2025" xml:space="preserve">in pul-
              <lb/>
            vere gryſeo major attractio.</s>
            <s xml:id="echoid-s2026" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2027" xml:space="preserve">4. </s>
            <s xml:id="echoid-s2028" xml:space="preserve">Pulverem itaque hunc gryſeum nitebar in ulteriori operatione
              <lb/>
            perfectius ſeparare a ſua Terra, ipſique admiſcui Salis Marini æqua-
              <lb/>
            lem quantitatem, atque in crucibulo urſi per 3 horas in Igne vehe-
              <lb/>
            mentiſſimo rotæ, vi carbonum Ligneorum & </s>
            <s xml:id="echoid-s2029" xml:space="preserve">foſſilium; </s>
            <s xml:id="echoid-s2030" xml:space="preserve">refrigeratis
              <lb/>
            deinde omnibus, pulvis erat ejuſdem coloris ac ante, & </s>
            <s xml:id="echoid-s2031" xml:space="preserve">qui a Ma-
              <lb/>
            gnete attrahebatur ut ante, necita ullam obtinui partium terreſtrium
              <lb/>
            ab aliis ſeparationem: </s>
            <s xml:id="echoid-s2032" xml:space="preserve">adeoque vel id quod maxima vi gaudet, avo-
              <lb/>
            lavit, vel in hac operatione ignis nihil mutationis induxit: </s>
            <s xml:id="echoid-s2033" xml:space="preserve">hac
              <lb/>
            igitur via non amplius pergendum eſſe ratus ſum, quia pulvis ab hoc
              <lb/>
            fortiſſimo Igne non mutatus fuit.</s>
            <s xml:id="echoid-s2034" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2035" xml:space="preserve">5. </s>
            <s xml:id="echoid-s2036" xml:space="preserve">Adeoque explorabam, an non tantopere aperuiſſem Magnetem,
              <lb/>
            ut ex eo nunc elicere poſſem Tincturam: </s>
            <s xml:id="echoid-s2037" xml:space="preserve">hunc in finem pulveri af-
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            fuſa fuit aqua, cum qua digeſſi 8 diebus; </s>
            <s xml:id="echoid-s2038" xml:space="preserve">ſed Sal modo in aqua ſol-
              <lb/>
            vebatur, cæteroquin nulla oriebatur Tinctura: </s>
            <s xml:id="echoid-s2039" xml:space="preserve">quo viſo affudi pul-
              <lb/>
            veri copioſam aquam, eum lavi effundendo ſalſam, & </s>
            <s xml:id="echoid-s2040" xml:space="preserve">reaffunden-
              <lb/>
            do inſipidam, donec aqua penitus inſipida redibat: </s>
            <s xml:id="echoid-s2041" xml:space="preserve">poſtea pulvis
              <lb/>
            exſiccatus exhibebat eundem colorem, quem pulvis Magnetis ante
              <lb/>
            ullam cum eo inſtitutam operationem, & </s>
            <s xml:id="echoid-s2042" xml:space="preserve">iterum æque fortiter â
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            Magnete attrahebatur: </s>
            <s xml:id="echoid-s2043" xml:space="preserve">in principio, quando ſupra eum tenetur
              <lb/>
            Magnes, aliquantum ſilet virtus, ſedelapſo uno alterove Secundo Mi-
              <lb/>
            nuto, attractio fit, pulvis qui ſemel attractus fuit & </s>
            <s xml:id="echoid-s2044" xml:space="preserve">abſterſus dein-
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            ceps, multo facilius de novo attrahitur, atque ad majorem diſtan-
              <lb/>
            tiam a Magnete commovetur, elevatur, ipſique advolat: </s>
            <s xml:id="echoid-s2045" xml:space="preserve">hæcſola
              <lb/>
            eſt differentia, quam ignis vehementis tortura pulveri intulit, </s>
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