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-div147" type="section" level="1" n="147">
          <p>
            <s xml:id="echoid-s5824" xml:space="preserve">
              <pb o="245" file="0259" n="259" rhead="DE MAGNETE."/>
            eandem, directione alterius dimidii plane inverſâ. </s>
            <s xml:id="echoid-s5825" xml:space="preserve">3°. </s>
            <s xml:id="echoid-s5826" xml:space="preserve">Aliquando
              <lb/>
            nullam virtuti Magneticæ mutationem induci, præterquam decre-
              <lb/>
            mentum, quod ſemper contingit in omnibus fiſſis filis. </s>
            <s xml:id="echoid-s5827" xml:space="preserve">4° Quan-
              <lb/>
            do una pars fili poſt fiſſionem mutatur in directione, tum ſemper
              <lb/>
            pars fili eſt tenuior, quæ mutatur, craſſiori manente eadem. </s>
            <s xml:id="echoid-s5828" xml:space="preserve">5°.
              <lb/>
            </s>
            <s xml:id="echoid-s5829" xml:space="preserve">Aliquando poſt fiſſionem alterius partis fili polus converſus eſt, al-
              <lb/>
            tera extremitate manente indifferenti, ita ut æque alliciatur â po-
              <lb/>
            lo Magnetis Boreo, quam ab Auſtrali. </s>
            <s xml:id="echoid-s5830" xml:space="preserve">6°. </s>
            <s xml:id="echoid-s5831" xml:space="preserve">Aliquando una pars fili
              <lb/>
            attrahitur ab uno polo, ſed eadem extremitas neque attrahitur,
              <lb/>
            neque repellitur ab altero Magnetis polo, neſciens quaſi quorſum
              <lb/>
            ſe vertet: </s>
            <s xml:id="echoid-s5832" xml:space="preserve">Suſpicabatur in principio Doctiſſimus Derhamus directio-
              <lb/>
            nis mutationem pendere â violentiâ filis inducta ferreis in fiſſione
              <lb/>
            & </s>
            <s xml:id="echoid-s5833" xml:space="preserve">flexione, ſed hanc ſententiam rejecit, obſervans nonnullorum
              <lb/>
            fiſſorum & </s>
            <s xml:id="echoid-s5834" xml:space="preserve">parum inflexorum filorum dimidium eſſe mutatum, al-
              <lb/>
            tera parte manente eadem: </s>
            <s xml:id="echoid-s5835" xml:space="preserve">tum nonnullorum valde inflexorum di-
              <lb/>
            rectionem permanſiſſe. </s>
            <s xml:id="echoid-s5836" xml:space="preserve">Præterea obſervavit perinde eſſe, ſive à
              <lb/>
            polo Boreo, ſive â polo Auſtrali fiſſio incepta fuerit.</s>
            <s xml:id="echoid-s5837" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div148" type="section" level="1" n="148">
          <head xml:id="echoid-head157" xml:space="preserve">EXPERIMENTUM CXXII.</head>
          <p>
            <s xml:id="echoid-s5838" xml:space="preserve">Cum filum ferreum fiſſum acquirit unam ſuperficiem planam,
              <lb/>
            qua parte ſcilicet tranſit cuneus, alteram gibbam, magna eſt dire-
              <lb/>
            ctionis differentia, ſi filum impoſitum fuerit plano, ut planities
              <lb/>
            ſurſum ſpectet, ſive deorſum. </s>
            <s xml:id="echoid-s5839" xml:space="preserve">Gibba ſuperficies ſit ſuperior, plana
              <lb/>
            inferior fili horizontaliter jacentis, tum id attrahetur a duobus po-
              <lb/>
            lis Magnetis, & </s>
            <s xml:id="echoid-s5840" xml:space="preserve">ab iiſdem repelletur; </s>
            <s xml:id="echoid-s5841" xml:space="preserve">ſed invertatur filum, ut
              <lb/>
            planities ſurſum ſpectet, tum una extremitas attrahetur ab uno
              <lb/>
            Magnetis polo, repelletur ab altero. </s>
            <s xml:id="echoid-s5842" xml:space="preserve">Hoc etiam ſubtiliter ob-
              <lb/>
            ſervavit Derhamus, opinatus lubricitatem directionis pendere
              <lb/>
            a converſione polorum ex fiſſione, qua polus Boreus evaſiſſet
              <lb/>
            Auſtralis, ſed nunquam detegere potuit, latera cujusvis extre-
              <lb/>
            mi, alteriuſve partis, eſſe eadem, Magnete nunc huic, nunc alte-
              <lb/>
            ri lateri oppoſito.</s>
            <s xml:id="echoid-s5843" xml:space="preserve"/>
          </p>
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