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-div163" type="section" level="1" n="163">
          <head xml:id="echoid-head173" xml:space="preserve">EXPERIMENTUM CXXXVI.</head>
          <p>
            <s xml:id="echoid-s6179" xml:space="preserve">Virga ferrea tenuis & </s>
            <s xml:id="echoid-s6180" xml:space="preserve">oblonga in Igne candefiat, quam in vol-
              <lb/>
            ſella ænea tene perpendiculariter ad horizontem: </s>
            <s xml:id="echoid-s6181" xml:space="preserve">hujus inferior
              <lb/>
            cuſpis, quamvis adhuc rubens, attrahit fortiter Verſorii polum
              <lb/>
            Auſtralem, & </s>
            <s xml:id="echoid-s6182" xml:space="preserve">fugat Boreum: </s>
            <s xml:id="echoid-s6183" xml:space="preserve">Cuſpis autem ſuperior attrahit Ver-
              <lb/>
            ſorii polum Boreum, fugat Auſtralem.</s>
            <s xml:id="echoid-s6184" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6185" xml:space="preserve">Adeoque Ferrum ignitum illico vi Magnetica donatur in hoc
              <lb/>
            ſitu perpendiculari, & </s>
            <s xml:id="echoid-s6186" xml:space="preserve">æque cito ac ſi Magneti affrictum fuiſ-
              <lb/>
            ſet.</s>
            <s xml:id="echoid-s6187" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6188" xml:space="preserve">2. </s>
            <s xml:id="echoid-s6189" xml:space="preserve">Virga hæc in eodem perpendiculari ſitu horæ ſpatio relicta,
              <lb/>
            oſtendit omnino eandem vim in Verſorium quam ante, illud ta-
              <lb/>
            men non tam fortiter attrahebat, nunc frigida, quam antea
              <lb/>
            ignita.</s>
            <s xml:id="echoid-s6190" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6191" xml:space="preserve">3. </s>
            <s xml:id="echoid-s6192" xml:space="preserve">Eandem virgam iterum in Igne candefactam immerſi Aquæ
              <lb/>
            perpendiculariter & </s>
            <s xml:id="echoid-s6193" xml:space="preserve">penitus, ejus cuſpis inferior polus Boreus eva-
              <lb/>
            ſit, nam Verſorii polum Auſtralem attraxit vi valida: </s>
            <s xml:id="echoid-s6194" xml:space="preserve">Non tamen
              <lb/>
            repetitæ candefactiones & </s>
            <s xml:id="echoid-s6195" xml:space="preserve">in Aquâ extinctiones vim attractricem
              <lb/>
            Virgæ auxiſſe mihi viſæ ſunt.</s>
            <s xml:id="echoid-s6196" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6197" xml:space="preserve">4. </s>
            <s xml:id="echoid-s6198" xml:space="preserve">Eandem virgam denuo calentem, perpendiculariter Aquæ im-
              <lb/>
            miſi uſque ad dimidiam ſui longitudinem, ſic quoque cuſpis inferior
              <lb/>
            in Aqua extincta evaſit polus Boreus, cuſpis tamen ſuperior imme-
              <lb/>
            diate poſt extinctionem attrahebat æque polum Boreum quam Au-
              <lb/>
            ſtralem.</s>
            <s xml:id="echoid-s6199" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6200" xml:space="preserve">5. </s>
            <s xml:id="echoid-s6201" xml:space="preserve">Deinde patallelopipedum 5 pollices longum, baſeos quadratæ,
              <lb/>
            unius pollicis, ignitum, ſolo impoſui perpendiculariter erectum, cum
              <lb/>
            elapſâ horâ frigebat, baſis inferior attraxit polum Verſorii Boreum,
              <lb/>
            quem quoque attraxit baſis parallelopipedi ſuperior: </s>
            <s xml:id="echoid-s6202" xml:space="preserve">Quamobrem
              <lb/>
            in hoc ferreo parallelopipedo brevique vis Magnetica directrix non
              <lb/>
            colligitur intra tam anguſtum temporis ſpatium, quam quidem in
              <lb/>
            virgis tenuioribus: </s>
            <s xml:id="echoid-s6203" xml:space="preserve">imo non colligitur ſubito in Ferro tam craſſo,
              <lb/>
            quamvis etiam in Aqua extincto.</s>
            <s xml:id="echoid-s6204" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6205" xml:space="preserve">Cæteroquin obſervare licet in ferramentis univerſe omnibus, ne
              <lb/>
            quidem craſſiſſimis exceptis, imo in iis, quæ a Magnete ob magni-
              <lb/>
            tudinem non imprægnari vi Magnetica poterant, hæc ad </s>
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