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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              <pb o="132" file="0146" n="146" rhead="DISSERTATIO"/>
            Magneti apponantur, ſingulo lateri polari unum, pes B E etiam
              <lb/>
            accurate tangat inferiorem Magnetis partem; </s>
            <s xml:id="echoid-s3235" xml:space="preserve">ambo arcte cum Ma-
              <lb/>
            gnete ligentur, qui ita præparatus, vocatur Armatus Magnes, qua-
              <lb/>
            lem exhibet figura 5, Tab. </s>
            <s xml:id="echoid-s3236" xml:space="preserve">6. </s>
            <s xml:id="echoid-s3237" xml:space="preserve">Hac methodo fere omnis vis Magne-
              <lb/>
            tis, rectà ex polis egrediens, intrat in armaturam, ad pedem E F di-
              <lb/>
            rigitur, qui cum inferius ſit rotundiuſculus, vim condenſat in ar-
              <lb/>
            ctius ſpatium, in quo ea quaſi concentrata hæret, ex quo proinde
              <lb/>
            maximum Ferri pondus geſtabitur.</s>
            <s xml:id="echoid-s3238" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3239" xml:space="preserve">Formam armaturæ aliam deſcripſit Gaſſendus & </s>
            <s xml:id="echoid-s3240" xml:space="preserve">Cabeus in Phi-
              <lb/>
            loſ. </s>
            <s xml:id="echoid-s3241" xml:space="preserve">Mag. </s>
            <s xml:id="echoid-s3242" xml:space="preserve">Lib. </s>
            <s xml:id="echoid-s3243" xml:space="preserve">4. </s>
            <s xml:id="echoid-s3244" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s3245" xml:space="preserve">44. </s>
            <s xml:id="echoid-s3246" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s3247" xml:space="preserve">408. </s>
            <s xml:id="echoid-s3248" xml:space="preserve">Magnetem ſecundum axin per-
              <lb/>
            forando, tum virgam Chalybeam, foramen exquiſite complen-
              <lb/>
            tem, tranſmittendo, hæc ex ſuis extremitatibus magnam virtutem
              <lb/>
            exercet: </s>
            <s xml:id="echoid-s3249" xml:space="preserve">Nulli tamen auctor ſum, ut præſtantem Magnetem hoc mo-
              <lb/>
            do perforet, quia magna pars præſtantis virtutis exſculpitur, & </s>
            <s xml:id="echoid-s3250" xml:space="preserve">tan-
              <lb/>
            rum ab uno extremo tranſmiſſæ virgæ pondus geſtatur, ſeſe non ad-
              <lb/>
            juvantibus ambobus polis, uti in noſtrâ methodo.</s>
            <s xml:id="echoid-s3251" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3252" xml:space="preserve">Solent in Magnete plurimæ anomaliæ obſervari, quas nemo mor-
              <lb/>
            talium facile explicabit, quamdiu, quid ſit vis Magnetica, ignora-
              <lb/>
            tur; </s>
            <s xml:id="echoid-s3253" xml:space="preserve">ecce enim quænam obſervavit Cl. </s>
            <s xml:id="echoid-s3254" xml:space="preserve">Butterfield, memorante
              <lb/>
            Hartſoekero, dari aliquos Magnetes, qui inermes plus videntur a-
              <lb/>
            gere, quam armati, eludentes ita armati omnem exſpecta-
              <lb/>
            tionem: </s>
            <s xml:id="echoid-s3255" xml:space="preserve">alios, qui inermes admodum imbecilles videntur, arma-
              <lb/>
            tos plurimum virtutis poſſidere. </s>
            <s xml:id="echoid-s3256" xml:space="preserve">An igitur nonnullorum Magnetum
              <lb/>
            vis facilius per Ferrum tranſit, aliorum difficilius? </s>
            <s xml:id="echoid-s3257" xml:space="preserve">An hoc pendet
              <lb/>
            a diverſa indole Ferri? </s>
            <s xml:id="echoid-s3258" xml:space="preserve">Ad hæc nondum ſatis attenderunt mortales,
              <lb/>
            & </s>
            <s xml:id="echoid-s3259" xml:space="preserve">idcirco nihil certi concludi poteſt.</s>
            <s xml:id="echoid-s3260" xml:space="preserve"/>
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          <head xml:id="echoid-head103" xml:space="preserve">EXPERIMENTUM LXXIV.</head>
          <p>
            <s xml:id="echoid-s3261" xml:space="preserve">Magnes, deſcripto armatus modo, attrahit ſuſtinetque Ferrum
              <lb/>
            multo majoris ponderis applicatum ſuis pedibus, quam inermis ex
              <lb/>
            utroque polo elevaverat.</s>
            <s xml:id="echoid-s3262" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3263" xml:space="preserve">Eſt enim mihi Magnes, qui inermis ex ſingulo polo ſuſtinet cir-
              <lb/>
            citer 5 Ferri Uncias, adeoque ex utroque ſimul ſuſtineret modo 10
              <lb/>
            Uncias, hic autem armatus elevat Libras 7 Ferri.</s>
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            <s xml:id="echoid-s3265" xml:space="preserve">Utque aliorum teſtimoniis mea confirmem obſervata, </s>
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