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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        <div xml:id="echoid-div92" type="section" level="1" n="92">
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            <s xml:id="echoid-s3081" xml:space="preserve">
              <pb o="127" file="0141" n="141" rhead="DE MAGNETE."/>
            tate maſſæ plus illius materiæ, quæ Magnetica eſt, in ſe retinet,
              <lb/>
            fortioremque attractionem exercet: </s>
            <s xml:id="echoid-s3082" xml:space="preserve">imo inde intelligitur, Ferrum eo
              <lb/>
            majori vi Magnetica imbui poſſe, quo plus illius materiæ Magne-
              <lb/>
            ticæ in ſe continet, & </s>
            <s xml:id="echoid-s3083" xml:space="preserve">omne Ferrum non ejus æqualem copiam ha-
              <lb/>
            bere docet experientia, cum datur Ferrum quod longe majorem vim
              <lb/>
            attrahendi accipit â Magnete, quam alterum.</s>
            <s xml:id="echoid-s3084" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3085" xml:space="preserve">Si Vitriolum Martis affricetur polo Magnetis, vi majori imbui-
              <lb/>
            tur, & </s>
            <s xml:id="echoid-s3086" xml:space="preserve">Acum Nauticam longe fortius attrahit, & </s>
            <s xml:id="echoid-s3087" xml:space="preserve">ex ſua ſede pro-
              <lb/>
            turbat, quam Vitriolum purum.</s>
            <s xml:id="echoid-s3088" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3089" xml:space="preserve">Boyleus Ocram Brittannicam, quæ eſt rubigo Ferri, ſed a natura-
              <lb/>
            libus Salibus acidis corroſi miſtique cum terra, exploravit an vim
              <lb/>
            Magneticam oſtenderet; </s>
            <s xml:id="echoid-s3090" xml:space="preserve">hujus nequicquam detexit: </s>
            <s xml:id="echoid-s3091" xml:space="preserve">cum autem
              <lb/>
            poſtea Igni commiſerat Ocram, partesque Sulphureas, Salinas, aliaſ-
              <lb/>
            que plurimas expulerat; </s>
            <s xml:id="echoid-s3092" xml:space="preserve">Ferrum in maſſa reſiduum ſuas vires attra-
              <lb/>
            ctrices oſtendere & </s>
            <s xml:id="echoid-s3093" xml:space="preserve">exſerere potuit, quibus egit in Acum Nauticam:
              <lb/>
            </s>
            <s xml:id="echoid-s3094" xml:space="preserve">Vid. </s>
            <s xml:id="echoid-s3095" xml:space="preserve">Magnet. </s>
            <s xml:id="echoid-s3096" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s3097" xml:space="preserve">499.</s>
            <s xml:id="echoid-s3098" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div93" type="section" level="1" n="93">
          <head xml:id="echoid-head101" xml:space="preserve">EXPERIMENTUM LXXIII.</head>
          <p>
            <s xml:id="echoid-s3099" xml:space="preserve">Memoravimus in initio hujus Capitis 2, Magnetem vi valida at-
              <lb/>
            trahere aliquam arenæ ſpeciem, nigri coloris, ſplendentem, nun-
              <lb/>
            quam rubigine infectam, quæ ex Virginia affertur, atque Magnetis
              <lb/>
            ope ex alio ſecernitur pulvere; </s>
            <s xml:id="echoid-s3100" xml:space="preserve">gravitate ſpecifica donatur, quæ
              <lb/>
            eſt ad arenam vulgarem, uti 161 ad 71. </s>
            <s xml:id="echoid-s3101" xml:space="preserve">Operæ pretium erat inda-
              <lb/>
            gare an hæc Arena eſſet Ferrum, ejuſve quædam ſpecies, an nihil
              <lb/>
            metalli in ſe concluderet: </s>
            <s xml:id="echoid-s3102" xml:space="preserve">hoc ſi foret, Magnes in alia corpora,
              <lb/>
            præterquam in Ferrum operaretur: </s>
            <s xml:id="echoid-s3103" xml:space="preserve">Moulenus hanc Arenam variis
              <lb/>
            torſit modis, ſuorumque Experimentorum ſucceſſus inſeruit Philoſ.
              <lb/>
            </s>
            <s xml:id="echoid-s3104" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s3105" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s3106" xml:space="preserve">197. </s>
            <s xml:id="echoid-s3107" xml:space="preserve">alia addidi tentamina, quæ ad clariorem ejus in-
              <lb/>
            tellectum conducere arbitratus fui.</s>
            <s xml:id="echoid-s3108" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3109" xml:space="preserve">1. </s>
            <s xml:id="echoid-s3110" xml:space="preserve">Si hæc arena Igni committatur & </s>
            <s xml:id="echoid-s3111" xml:space="preserve">calcinetur, poſt calcinatio-
              <lb/>
            nem vehementius a Magnete attrahitur, quam antea.</s>
            <s xml:id="echoid-s3112" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3113" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3114" xml:space="preserve">Arena calcinata mixta fuit cum Carbone in pulverem redacto,
              <lb/>
            impoſitaque fornaci probatoriæ per horæ ſpatium non abiit in Re-
              <lb/>
            gulum, ſed adhuc vehementiori impetu a Magnete attrahebatur.</s>
            <s xml:id="echoid-s3115" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3116" xml:space="preserve">Quamobrem Ignis ſolus aliquid ex hoc pulvere ſeparat, quod </s>
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