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-div104" type="section" level="1" n="104">
          <pb o="139" file="0153" n="153" rhead="DEMAGNETE."/>
          <p>
            <s xml:id="echoid-s3411" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s3412" xml:space="preserve">7. </s>
            <s xml:id="echoid-s3413" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3414" xml:space="preserve">4. </s>
            <s xml:id="echoid-s3415" xml:space="preserve">Magnes A innatans Cymbæ in vaſe aquæ pleno
              <lb/>
            C B D, polo m Auſtrali reſpiciat Zenith; </s>
            <s xml:id="echoid-s3416" xml:space="preserve">ſupra vaſis medium pen-
              <lb/>
            deat acus ferrea E, in quam agat Magnes, ut eo melius in medio
              <lb/>
            vaſis teneatur; </s>
            <s xml:id="echoid-s3417" xml:space="preserve">Magnetis aliquamdiu ſibi commiſſi notetur pars pla-
              <lb/>
            gam Boream ſpectans; </s>
            <s xml:id="echoid-s3418" xml:space="preserve">deinde convertatur, iterum ſibi relictus, eô-
              <lb/>
            dem latere ad plagam Boream convertetur, quemadmodum primus
              <lb/>
            obſervavit Grandamicus.</s>
            <s xml:id="echoid-s3419" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div105" type="section" level="1" n="105">
          <head xml:id="echoid-head114" xml:space="preserve">EXPERIMENTUM LXXXIII.</head>
          <p>
            <s xml:id="echoid-s3420" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s3421" xml:space="preserve">7. </s>
            <s xml:id="echoid-s3422" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3423" xml:space="preserve">5. </s>
            <s xml:id="echoid-s3424" xml:space="preserve">Sit Magnes A, C, D, K, cujus ambo poli
              <lb/>
            A, D, proinde cujus axis ſit A D, dividatur bifariam in C K, ſectio-
              <lb/>
            ne perpendiculari ad axim, erit unius ſegmenti polus A, antea Au-
              <lb/>
            ſtralis, adhuc Auſtralis, & </s>
            <s xml:id="echoid-s3425" xml:space="preserve">B Boreus: </s>
            <s xml:id="echoid-s3426" xml:space="preserve">alterius ſegmenti pars a, quæ
              <lb/>
            adhæſit polo Boreo B, erit polus Auſtralis, pars D polus Boreus, ut
              <lb/>
            ante.</s>
            <s xml:id="echoid-s3427" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3428" xml:space="preserve">Eſt hoc Experimentum in controverſo, & </s>
            <s xml:id="echoid-s3429" xml:space="preserve">ideo merebatur exa-
              <lb/>
            men accuratius & </s>
            <s xml:id="echoid-s3430" xml:space="preserve">novum: </s>
            <s xml:id="echoid-s3431" xml:space="preserve">quicunque autem non poſſidet viles Ma-
              <lb/>
            gnetes, aut artem eos ſeparandi non callet, idem inſtituere poteſt
              <lb/>
            cum filo ferreo, prius ſuper Magnete ducto, hoc enim in partes
              <lb/>
            diviſum eadem præbebit phænomena: </s>
            <s xml:id="echoid-s3432" xml:space="preserve">Del Porta in Magia Nat. </s>
            <s xml:id="echoid-s3433" xml:space="preserve">& </s>
            <s xml:id="echoid-s3434" xml:space="preserve">
              <lb/>
            poſtea Ridley, in Treatiſe of Magnetic Bodies Ch. </s>
            <s xml:id="echoid-s3435" xml:space="preserve">9. </s>
            <s xml:id="echoid-s3436" xml:space="preserve">contrarium
              <lb/>
            affirmant, ſtatuentes polum Auſtralem A mutatum iri in Borealem
              <lb/>
            factâ ſectione: </s>
            <s xml:id="echoid-s3437" xml:space="preserve">An hoc ipſis contigerit neſcio, & </s>
            <s xml:id="echoid-s3438" xml:space="preserve">dubito: </s>
            <s xml:id="echoid-s3439" xml:space="preserve">mihi con-
              <lb/>
            trarium evenit, atque mecum conſentiunt Gilbertus Lib. </s>
            <s xml:id="echoid-s3440" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3441" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s3442" xml:space="preserve">5.
              <lb/>
            </s>
            <s xml:id="echoid-s3443" xml:space="preserve">de Magnete, tum Barlow in Magnetical advertiſements, Chap. </s>
            <s xml:id="echoid-s3444" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3445" xml:space="preserve">
              <lb/>
            Non tamen falſitatis argui poteſt del Porta aut Ridleyus, quia
              <lb/>
            forſitan facturi hoc Experimentum, cuneo fiderunt Magnetem,
              <lb/>
            magnam ipſi vim inferendo, quo mutata eſt vis directrix Magnetis; </s>
            <s xml:id="echoid-s3446" xml:space="preserve">
              <lb/>
            obſervavi enim, quando filum ferreum in partes ope limæ lente,
              <lb/>
            ſed penitus ſecabam, directricem vim in omnibus ſegmentis man-
              <lb/>
            ſiſſe eandem; </s>
            <s xml:id="echoid-s3447" xml:space="preserve">cum vero partes fili tantummodo uſque ad medium
              <lb/>
            lima ſeparaveram, & </s>
            <s xml:id="echoid-s3448" xml:space="preserve">reliquum inflectendo frangebam, vel cuneo
              <lb/>
            malleoque findebam, polum Auſtralem mutatum eſſe in ſemi-
              <lb/>
            boreum, imo aliquando penitus in Boreum, unde ejuſmodi ſegmen-
              <lb/>
            tum duos polos Boreos in ſuis extremitatibus habebat.</s>
            <s xml:id="echoid-s3449" xml:space="preserve"/>
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