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-s5667" xml:space="preserve">
              <pb o="240" file="0254" n="254" rhead="DISSERTATIO"/>
            polus ſe contigerit, vis directione oppoſita exiens & </s>
            <s xml:id="echoid-s5668" xml:space="preserve">ſibi æquilibra-
              <lb/>
            ta, ſe neceſſario deſtruit, ita ut Ferrum aliud attrahi nequeat,
              <lb/>
            quantum enim attraheretur ab uno fili polo, tantum repelleretur
              <lb/>
            ab altero, hinc actione nulla ab utroque ſimul movetur: </s>
            <s xml:id="echoid-s5669" xml:space="preserve">quia au-
              <lb/>
            tem uterque polus ſe attrahit, vim retinere deberet; </s>
            <s xml:id="echoid-s5670" xml:space="preserve">imo eam reti-
              <lb/>
            net & </s>
            <s xml:id="echoid-s5671" xml:space="preserve">immutatam, ſi filum ita tantummodo inflexum fuerit, ut
              <lb/>
            ſponte ſe reſtituat in priorem rectum ſitum; </s>
            <s xml:id="echoid-s5672" xml:space="preserve">ſed amittit partem vir-
              <lb/>
            tutis cum ita inflectatur, ut ſitus partium mutetur, aſperaque red-
              <lb/>
            datur ſuperſicies, quemadmodum ſupra in Exper. </s>
            <s xml:id="echoid-s5673" xml:space="preserve">CXIII. </s>
            <s xml:id="echoid-s5674" xml:space="preserve">demon-
              <lb/>
            ſtratum fuit: </s>
            <s xml:id="echoid-s5675" xml:space="preserve">aſt ſubtilem Derhami obſervationem nondum intelli-
              <lb/>
            gimus, quid enim dies aut veſpera afferre poteſt viribus magneti-
              <lb/>
            cis, ita ut hoc tempore maneant ſuperſtites, altero evaneſcant? </s>
            <s xml:id="echoid-s5676" xml:space="preserve">non
              <lb/>
            Lux aliquid hic contribuit, tum enim potius diurnis horis maneret
              <lb/>
            vis in filis inflexis, quam veſpertinis: </s>
            <s xml:id="echoid-s5677" xml:space="preserve">non calor aut frigus rarefa-
              <lb/>
            ctione aut condenſatione eſt cauſa, quippe dies hyemales ſunt fri-
              <lb/>
            gidiores noctibus æſtivis, quare hyeme ſemper ſuperſtes vis obſer-
              <lb/>
            varetur, ſi a frigore penderet: </s>
            <s xml:id="echoid-s5678" xml:space="preserve">nunc modo admirandam proprieta-
              <lb/>
            tem virtutis Magneticæ adnotare licet.</s>
            <s xml:id="echoid-s5679" xml:space="preserve"/>
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          <head xml:id="echoid-head150" xml:space="preserve">EXPERIMENTUM CXV.</head>
          <p>
            <s xml:id="echoid-s5680" xml:space="preserve">Fili ferrei, Magneticâ vi imprægnati, altera extremitas in for-
              <lb/>
            cipe teneatur firme, prehenſa altera extremitate intorqueatur totum
              <lb/>
            filum, ita ut axis ſemper maneat idem, ſive immobilis & </s>
            <s xml:id="echoid-s5681" xml:space="preserve">proinde
              <lb/>
            omnium partium internus ſitus mutetur, variis abſolutis intorſioni-
              <lb/>
            bus obſervatur vis directrix fili multum debilitata, & </s>
            <s xml:id="echoid-s5682" xml:space="preserve">aliquando in-
              <lb/>
            verſa, ita ut extremitas, quæ attrahebatur antea â polo Magnetis
              <lb/>
            Boreo, nunc ab eo repellatur: </s>
            <s xml:id="echoid-s5683" xml:space="preserve">Cum variis filis hoc Experimentum
              <lb/>
            inſtitutum diverſa phænomena exhibet, cum enim filum nulla con-
              <lb/>
            ſequentia puncta habuerit ante intorſionem, eâ peractâ viſum
              <lb/>
            fuit accepiſſe Puncta Conſequentia varia, nunc ab axis cuſpide
              <lb/>
            Borea attracta, nunc repulſa, motâ nimirum Acu ſecundum to-
              <lb/>
            tam fili longitudinem, quemadmodum Doctiſſimus Derhamus etiam
              <lb/>
            obſervavit.</s>
            <s xml:id="echoid-s5684" xml:space="preserve"/>
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