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-div102" type="section" level="1" n="102">
          <p>
            <s xml:id="echoid-s3347" xml:space="preserve">
              <pb o="137" file="0151" n="151" rhead="DEMAGNETE."/>
            ſervatum eſt habuiſſe quatuor polos, duos Boreos B, B, duos
              <lb/>
            Auſtrales M, M: </s>
            <s xml:id="echoid-s3348" xml:space="preserve">alium examinavi Magnetem, qui in omni fe-
              <lb/>
            re puncto ſuæ ſuperficiei polo donatus videbatur, & </s>
            <s xml:id="echoid-s3349" xml:space="preserve">circumquaque
              <lb/>
            vim attrahendi fere æqualem exercebat: </s>
            <s xml:id="echoid-s3350" xml:space="preserve">Verum hi ſunt Magnetes
              <lb/>
            Anomali, minima tamen pars eorum duobus gaudet polis ſibi directe
              <lb/>
            oppoſitis, de Regularibus Magnetibus in ſequentibus modo agam.</s>
            <s xml:id="echoid-s3351" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div103" type="section" level="1" n="103">
          <head xml:id="echoid-head112" xml:space="preserve">EXPERIMENTUM LXXXI.</head>
          <p>
            <s xml:id="echoid-s3352" xml:space="preserve">Magnes parvæ impoſitus Cymbæ ligneæ, ut Aquæ in vaſe am-
              <lb/>
            plo innater, jaceatque axe ad horizontem parallelo, ſeconvertet, do-
              <lb/>
            nec ſuis polis reſpiciat determinatas cæli plagas, quarum una in hac
              <lb/>
            Regione eſt utcunque Borea, altera utcunque Auſtralis.</s>
            <s xml:id="echoid-s3353" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3354" xml:space="preserve">Minus exactè loquuntur, nec accuratas inſtituerunt obſerva-
              <lb/>
            tiones, qui Magnetem ſe ad Boream & </s>
            <s xml:id="echoid-s3355" xml:space="preserve">Auſtrum convertere dixe-
              <lb/>
            runt, inferius enim liquebit pauca tantum in hoc terrarum orbe nunc
              <lb/>
            dari loca, in quibus Magnes accurate Boream Auſtrumque ſpectat,
              <lb/>
            nam ſunt modo tres Meridiani ejuſmodi hucuſque cogniti; </s>
            <s xml:id="echoid-s3356" xml:space="preserve">ſufficiat
              <lb/>
            id annotaſſe pro hoc Experimento, mox enim prolixius de iis age-
              <lb/>
            mus.</s>
            <s xml:id="echoid-s3357" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3358" xml:space="preserve">Non requiritur, ut Cymbæ innatet Magnes, cujus directionem ex-
              <lb/>
            ploramus, ea enim obſervatur quoque, ſuſpenſo Magnete ex filo ſeri-
              <lb/>
            ceo tenui, non intorto, ſed texto, ejuſque axe ad horizontem parallelo:
              <lb/>
            </s>
            <s xml:id="echoid-s3359" xml:space="preserve">Neque differentia obſervatur, ſive ſit Magnes grandis, ſive exiguus,
              <lb/>
            ſive unitus, ſive in partes diſſectus, omnes quippe ejus particulæ
              <lb/>
            eâdem directione aguntur.</s>
            <s xml:id="echoid-s3360" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3361" xml:space="preserve">D
              <emph style="sc">EFINITIO.</emph>
            </s>
            <s xml:id="echoid-s3362" xml:space="preserve">Polus Magnetis, Boream ſemper ſpectans, vocatur
              <lb/>
            Boreus, qui Auſtro obvertitur polus Auſtralis.</s>
            <s xml:id="echoid-s3363" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3364" xml:space="preserve">Scholion. </s>
            <s xml:id="echoid-s3365" xml:space="preserve">Incertum eſt, quo tempore Magnetis, & </s>
            <s xml:id="echoid-s3366" xml:space="preserve">Ferri ſuper
              <lb/>
            ipſo ducti, directio ad plagas Cæli Boreas & </s>
            <s xml:id="echoid-s3367" xml:space="preserve">Auſtrales detecta fuit:
              <lb/>
            </s>
            <s xml:id="echoid-s3368" xml:space="preserve">uti & </s>
            <s xml:id="echoid-s3369" xml:space="preserve">quando a nautis cœpit in uſum vocari, aptarique Acus in for-
              <lb/>
            mam Compaſſi, maritimis accommodati uſibus. </s>
            <s xml:id="echoid-s3370" xml:space="preserve">Probabile eſt, ali-
              <lb/>
            quem caſu primum inveniſſe Magnetis impoſiti cymbulæ, natanti
              <lb/>
            in Aqua, alterum polum conſtanter dirigi Boream verſus, alterum
              <lb/>
            Auſtrum verſus: </s>
            <s xml:id="echoid-s3371" xml:space="preserve">deinde Ferrum Magneti aſſrictum in ſimili cym-
              <lb/>
            bula agi eâdem directione: </s>
            <s xml:id="echoid-s3372" xml:space="preserve">poſtea Ferrum acutæ fuit </s>
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