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-s2454" xml:space="preserve">
              <pb o="101" file="0115" n="115" rhead="DE MAGNETE."/>
            ſitiei Ferro, id quod eſt longius majoribus viribus imprægnari breviori,
              <lb/>
            attamen modo uſque ad aliquam cum perventum ſit longitudinem, tum
              <lb/>
            maximis donari viribus, a qua ſi receſſerit longitudine majori, aut bre-
              <lb/>
            vitate, minores a Magnete vires aufert: </s>
            <s xml:id="echoid-s2455" xml:space="preserve">Sed maxima virium obſerva-
              <lb/>
            tur differentia inter longitudinem 10 poll. </s>
            <s xml:id="echoid-s2456" xml:space="preserve">& </s>
            <s xml:id="echoid-s2457" xml:space="preserve">4 pollic. </s>
            <s xml:id="echoid-s2458" xml:space="preserve">hæc enim
              <lb/>
            tantum pondus 1 {1/2} grani tulit, altera geſtante 33 grana: </s>
            <s xml:id="echoid-s2459" xml:space="preserve">non quo-
              <lb/>
            que videtur proportio dari inter ferri longitudinem & </s>
            <s xml:id="echoid-s2460" xml:space="preserve">virium quan-
              <lb/>
            titatem.</s>
            <s xml:id="echoid-s2461" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div52" type="section" level="1" n="52">
          <head xml:id="echoid-head60" xml:space="preserve">EXPERIMENTUM XXXII.</head>
          <p>
            <s xml:id="echoid-s2462" xml:space="preserve">Lamella Chalybea temperata, 4 pollices longa, {4/10} pollic. </s>
            <s xml:id="echoid-s2463" xml:space="preserve">lata,
              <lb/>
            {1/10} pollic. </s>
            <s xml:id="echoid-s2464" xml:space="preserve">alta, ſuper polo Magnetis ducta ter, lente & </s>
            <s xml:id="echoid-s2465" xml:space="preserve">cum de-
              <lb/>
            terminata appreſſione, ab extremo ſuo geſtavit pondus ferreum 72
              <lb/>
            granorum: </s>
            <s xml:id="echoid-s2466" xml:space="preserve">lamella ferrea mollis, accurate ſimilis & </s>
            <s xml:id="echoid-s2467" xml:space="preserve">æqualis priori
              <lb/>
            ſuper eodem polo Magnetis ter ducta quoque, cum eadem appreſ-
              <lb/>
            ſione, ab extremo ſuo geſtare tantum potuit ferrum 10 granorum;
              <lb/>
            </s>
            <s xml:id="echoid-s2468" xml:space="preserve">repetiti affrictus ad eundem Magnetem non communicaverunt ma-
              <lb/>
            jores ferro vires; </s>
            <s xml:id="echoid-s2469" xml:space="preserve">adeo ut Magnes multo majores vires cum Chaly-
              <lb/>
            be communicet quam cum Ferro, & </s>
            <s xml:id="echoid-s2470" xml:space="preserve">ſecundum hoc Experimentum,
              <lb/>
            quidem ſepties Majores; </s>
            <s xml:id="echoid-s2471" xml:space="preserve">an eadem proportio in aliis corporibus æ-
              <lb/>
            qualibus ex Chalybe & </s>
            <s xml:id="echoid-s2472" xml:space="preserve">Ferro confectis obtineat, non determino. </s>
            <s xml:id="echoid-s2473" xml:space="preserve">
              <lb/>
            Notaverunt plurimi Autores cum Chalybe Magnetem plus virtutis-
              <lb/>
            quam cum ferro communicare, ſed eorum nemo proportionem ac-
              <lb/>
            curate obſervavit; </s>
            <s xml:id="echoid-s2474" xml:space="preserve">multum differentiæ procul dubio dabitur, prout
              <lb/>
            Chalybs eſt purior impuriorve, & </s>
            <s xml:id="echoid-s2475" xml:space="preserve">Ferrum hujus alteriuſve indolis,
              <lb/>
            ex Sueciæ vel Germaniæ fodinis effoſſum.</s>
            <s xml:id="echoid-s2476" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div53" type="section" level="1" n="53">
          <head xml:id="echoid-head61" xml:space="preserve">EXPERIMENTUM XXXIII.</head>
          <p>
            <s xml:id="echoid-s2477" xml:space="preserve">Magnes fortius trahit Ferrum quam Chalybem, & </s>
            <s xml:id="echoid-s2478" xml:space="preserve">fortius Cha-
              <lb/>
            lybem mollem quam temperatum, fortius temperatum, quam qui
              <lb/>
            ſummopere induratus eſt.</s>
            <s xml:id="echoid-s2479" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2480" xml:space="preserve">Memini hoc olim Hartſoekerum quoque obſervaſſe, adnotantem,
              <lb/>
            ſi Magnes poſſit elevare regulam Chaly beam gravitatis 3 unciarum,
              <lb/>
            ipſum tum ad minimum regulam Ferri molliſſimi unciarum </s>
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