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-s6093" xml:space="preserve">
              <pb o="257" file="0271" n="271" rhead="DE MAGNETE."/>
            Experimenti CXXXI. </s>
            <s xml:id="echoid-s6094" xml:space="preserve">in igne candefacta fuit, tum abſque con-
              <lb/>
            cuſſione intra æneam detenta volſellam, ſupra ſolum lapideum
              <lb/>
            refrigerio commiſſa fuit, in ſitu ad Æ quatorem terræ parallelo,
              <lb/>
            atque ſimul in plano horizontali: </s>
            <s xml:id="echoid-s6095" xml:space="preserve">frigida attraxit Verſorii polum
              <lb/>
            Auſtralem, repulit Boreum, cuſpide quæ Occaſum ſpectavit:
              <lb/>
            </s>
            <s xml:id="echoid-s6096" xml:space="preserve">Verſorio tamen admovenda fuit propius uno pollice, ut virtutem
              <lb/>
            oſtenderet. </s>
            <s xml:id="echoid-s6097" xml:space="preserve">quamobrem in hoc ſitu frigeſacta debiliores nacta erat
              <lb/>
            vires, quam cum in Meridiano jacuerat. </s>
            <s xml:id="echoid-s6098" xml:space="preserve">Prævideram cuſpidis oc-
              <lb/>
            cidentalis vires attrahentes polum Auſtralem Verſorii; </s>
            <s xml:id="echoid-s6099" xml:space="preserve">nam decli-
              <lb/>
            nat hic terrarum hoc Anno Magnes 13°, 20 verſus Occaſum, adeo-
              <lb/>
            que poſita virga parallela ad Æ quatorem terræ, hærebat cuſpis Oc-
              <lb/>
            cidentalis in hemiſphærio virium Magneticarum Boreo, inde vim
              <lb/>
            & </s>
            <s xml:id="echoid-s6100" xml:space="preserve">directionem poli Borei nacta, non poterat non Verſorii polum
              <lb/>
            Auſtralem attrahere, repellere Boreum.</s>
            <s xml:id="echoid-s6101" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6102" xml:space="preserve">2. </s>
            <s xml:id="echoid-s6103" xml:space="preserve">Supra ſolum lapideum ducto Æ quatore Magnetico accura-
              <lb/>
            tiſſime, virgam eandem, prius in Igne candefactam, huic Æqua-
              <lb/>
            tori commiſi refrigerandam; </s>
            <s xml:id="echoid-s6104" xml:space="preserve">quo facto, cuſpide utraque attraxit
              <lb/>
            Verſorii polum Boreum & </s>
            <s xml:id="echoid-s6105" xml:space="preserve">Auſtralem, adeo ut vere indifferens fue-
              <lb/>
            rit virga, nullis donata polis, quemadmodum fieri debebat.</s>
            <s xml:id="echoid-s6106" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6107" xml:space="preserve">3. </s>
            <s xml:id="echoid-s6108" xml:space="preserve">Iterum virgam eandem, in Igne candefactam, ſolo impoſui
              <lb/>
            lapideo, ut Meridianum Magneticum ſecaret angulo 45 graduum,
              <lb/>
            atque cuſpide una ſpectaret Ortum Septentrionem verſus, altera
              <lb/>
            Occaſum Auſtrum verſus. </s>
            <s xml:id="echoid-s6109" xml:space="preserve">Illius refrigeratæ cuſpis occidua attra-
              <lb/>
            xit Verſorii polum Boreum, nihil agens in Auſtralem, cuſpis O-
              <lb/>
            rientalis attraxit Verſorii polum Auſtralem, nihil agens in Boreum:
              <lb/>
            </s>
            <s xml:id="echoid-s6110" xml:space="preserve">fuerunt hæc Experimenta ſummâ cum curâ capta in loco ab omni
              <lb/>
            Ferro remoto: </s>
            <s xml:id="echoid-s6111" xml:space="preserve">In attractione cuſpidum nihil anomali eſt, quippe
              <lb/>
            in §. </s>
            <s xml:id="echoid-s6112" xml:space="preserve">3. </s>
            <s xml:id="echoid-s6113" xml:space="preserve">cuſpis Auſtralis, evaſit polus Auſtralis, attrahens ideo Ver-
              <lb/>
            ſorii polum Boreum: </s>
            <s xml:id="echoid-s6114" xml:space="preserve">verum indifferentia alterius cuſpidis virgæ dif-
              <lb/>
            ficilius intelligitur, quippe hæc evincit attractioni æqualem fuiſſe
              <lb/>
            repulſionem, & </s>
            <s xml:id="echoid-s6115" xml:space="preserve">proinde hæc cuſpis bipolaris fuit reſpectu poli Au-
              <lb/>
            ſtralis: </s>
            <s xml:id="echoid-s6116" xml:space="preserve">ita quoque altera cuſpis Virgæ ſe habuit, indifferens hæc
              <lb/>
            enim reſpectu poli Borei, attraxit polum Verſorii Auſtralem: </s>
            <s xml:id="echoid-s6117" xml:space="preserve">adeo-
              <lb/>
            que hæc cuſpis bipolaris fuit reſpectu poli Borei, vi attrahente unius
              <lb/>
            æquilibrata cum repellente alterius poli. </s>
            <s xml:id="echoid-s6118" xml:space="preserve">Ter felicem profecto, qui
              <lb/>
            hæc clare intelligat, exponereque poſſit! proculdubio id </s>
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