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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          <pb o="246" file="0260" n="260" rhead="DISSERTATIO"/>
        </div>
        <div xml:id="echoid-div149" type="section" level="1" n="149">
          <head xml:id="echoid-head158" xml:space="preserve">EXPERIMENTUM CXXIII.</head>
          <p>
            <s xml:id="echoid-s5844" xml:space="preserve">Lamina Chalybea, 12 pollicum, qualis Magneti artificiali inſervit,
              <lb/>
            vi Magnetica imprægnetur, tum alia virga nova aut lamina ferrea,
              <lb/>
            non admodum craſſa, ponatur in incude fabri, huic virgæ prioris
              <lb/>
            laminæ extremo appoſito magna attractio orietur, cohærente virga
              <lb/>
            fortiter cum lamina; </s>
            <s xml:id="echoid-s5845" xml:space="preserve">ſi autem virga impoſita fuerit ligno, lapidi,
              <lb/>
            manui, aliive corpori non ferreo, tum a lamina priori duplo vel
              <lb/>
            triplo minus attrahetur. </s>
            <s xml:id="echoid-s5846" xml:space="preserve">Quo incus, cui virga impoſita eſt, fuerit
              <lb/>
            major, eo majori vi virga attrahetur a lamina, atque ad majorem
              <lb/>
            elevatur ab incude altitudinem.</s>
            <s xml:id="echoid-s5847" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5848" xml:space="preserve">Debetur hoc obſervatum Cl. </s>
            <s xml:id="echoid-s5849" xml:space="preserve">Reaumurio, in L’Hiſt. </s>
            <s xml:id="echoid-s5850" xml:space="preserve">de L’Acad.
              <lb/>
            </s>
            <s xml:id="echoid-s5851" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s5852" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s5853" xml:space="preserve">1723. </s>
            <s xml:id="echoid-s5854" xml:space="preserve">in quo notamus idem fieri ab ingenti incude, quod
              <lb/>
            a Magnete præſtatur, duæ claves ſupra Magnetem ad notabile in-
              <lb/>
            tervallum ſibi applicatæ cohærebant vi ex lapide egreſſâ, eadem vis
              <lb/>
            ex incude egreditur, quæ duabus laminis ſibi appoſitis attractionem
              <lb/>
            excitat, aut excitatam auget, quod idem eſt; </s>
            <s xml:id="echoid-s5855" xml:space="preserve">quemadmodum cla-
              <lb/>
            ves altius ſupra Magnetem elevatæ, minori vi ad ſe attrahebantur,
              <lb/>
            atque ideo a ſe ſolutæ decidebant, ita quoque virga adhærens lami-
              <lb/>
            næ ſupra incudem elevatæ, decidit ſoluta, modo lamina magis ab
              <lb/>
            incude recedat: </s>
            <s xml:id="echoid-s5856" xml:space="preserve">Quare iterum evincitur Ferrum eſſe Magnetem,
              <lb/>
            & </s>
            <s xml:id="echoid-s5857" xml:space="preserve">ab hoc in eo tantum differre, quod vi minori polleat, niſi Ma-
              <lb/>
            gnetem attigerit.</s>
            <s xml:id="echoid-s5858" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div150" type="section" level="1" n="150">
          <head xml:id="echoid-head159" xml:space="preserve">EXPERIMENTUM CXXIV.</head>
          <p>
            <s xml:id="echoid-s5859" xml:space="preserve">Intorquebam deinde duo fila ferrea circa ſe mutuo, quemadmo-
              <lb/>
            dum reſtiarii ex duobus funibus alium craſſiorem compoſituri faciunt;
              <lb/>
            </s>
            <s xml:id="echoid-s5860" xml:space="preserve">filorum longitudo fuit 4 pollicum, diameter {1/12} pollic. </s>
            <s xml:id="echoid-s5861" xml:space="preserve">hæc ſuper Au-
              <lb/>
            ſtrali Magnetis polo ducta, utroque extremo repellebant Verſorii
              <lb/>
            tam polumBoreum, quam Auſtralem, media ſui parte utrum que polum
              <lb/>
            allicientes; </s>
            <s xml:id="echoid-s5862" xml:space="preserve">hæc intorta ut poli cognomines ſe contingerent, bifido
              <lb/>
            capite utrimque terminabantur, quorum alterutrum attrahebat Ver-
              <lb/>
            ſorii polum Boreum, repellebat alterum: </s>
            <s xml:id="echoid-s5863" xml:space="preserve">bina oppoſita capita at-
              <lb/>
            trahebant tum polum Auſtralem, tum Boreum: </s>
            <s xml:id="echoid-s5864" xml:space="preserve">totum </s>
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