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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            ignitus multum virtutis acquiret a fortiori, ejuſque polus inferior
              <lb/>
            nunc non evadet Boreus, ſed Auſtralis, appetetque impetuoſe po-
              <lb/>
            lum Acûs nauticæ Boreum: </s>
            <s xml:id="echoid-s3510" xml:space="preserve">Si Magnes antequam igni committeba-
              <lb/>
            tur, imbecillis fuerit, impoſitus fortiori quamdiu calet, multis vi-
              <lb/>
            ribus donabitur, & </s>
            <s xml:id="echoid-s3511" xml:space="preserve">majoribus, quam unquam habuit: </s>
            <s xml:id="echoid-s3512" xml:space="preserve">Notat Nob.
              <lb/>
            </s>
            <s xml:id="echoid-s3513" xml:space="preserve">Boyle, ſe exploraſſe Magnetem, qui frigidus vix fruſtulum Acus ele-
              <lb/>
            vabat, ſed poſtquam candens impoſitus fuerat generoſo Magneti
              <lb/>
            donec frigebat, eum geſtaſſe multo plus ferri. </s>
            <s xml:id="echoid-s3514" xml:space="preserve">Si Magnes debilis,
              <lb/>
            frigensque, fortiori imponatur, virium incrementum acquirit, non
              <lb/>
            tamen tam cito, nec tantum, ac ſi Magnes ignitus alteri impoſitus
              <lb/>
            fuiſſet.</s>
            <s xml:id="echoid-s3515" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3516" xml:space="preserve">Ignis Magnetem rarefaciendo partes omnes aſe removet, minuſ-
              <lb/>
            que cohærentes reddit, ita enim metalla ex duriſſimis ſubſtantiis
              <lb/>
            fluida facit, idcirco Magnes generoſus, poſitus infra alium ignitum
              <lb/>
            partibuſque facile concutiendis, alioque locandis ordine conſtantem,
              <lb/>
            hujus partes ita agitat, ordinat, dirigitque, penetrando per eas ſuâ
              <lb/>
            virtute, ut poſtea multo majorem vim attrahentem poſſideant. </s>
            <s xml:id="echoid-s3517" xml:space="preserve">Sed
              <lb/>
            Magnes frigidus non conſtat ex partibustam facile mobilibus, alio-
              <lb/>
            que ordine diſponendis, idcirco frigidi, impoſiti generoſiori Magne-
              <lb/>
            ti, partes non tam bene mutantur, aliove ordinantur modo, nec
              <lb/>
            totidem viribus imprægnari poſſunt.</s>
            <s xml:id="echoid-s3518" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3519" xml:space="preserve">Ope hujus methodi convertere polos Magnetum poſſumus. </s>
            <s xml:id="echoid-s3520" xml:space="preserve">2°.
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            </s>
            <s xml:id="echoid-s3521" xml:space="preserve">Magnetibus imbecillioribus vires addere.</s>
            <s xml:id="echoid-s3522" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3523" xml:space="preserve">Sunt hæc primaria phænomena, quæ Magnetes ſua directione
              <lb/>
            oſtendunt, plura alia omiſi ſtudio, tum quia parvi videbantur mo-
              <lb/>
            menti, tum ne nimium prolixus evadam, tranſeundum potius ra-
              <lb/>
            tus ad examen directionis Ferri, cum quo accuratiores capi poſſunt
              <lb/>
            obſervationes; </s>
            <s xml:id="echoid-s3524" xml:space="preserve">nihil autem hic explico, quomodo phænomena fiant,
              <lb/>
            cum theoriam Halleyi ſub finem adnectendam eſſe duxi, ſimul cum
              <lb/>
            aliquot animadverſionibus, quibus intellectis, quid de cauſa dire-
              <lb/>
            ctionum ſtatuendum ſit, liquebit.</s>
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          </p>
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            <s xml:id="echoid-s3526" xml:space="preserve">D
              <emph style="sc">EFINITIO.</emph>
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            <s xml:id="echoid-s3527" xml:space="preserve">Verſorium, vel Acum Magneticam, vel Acum Nau-
              <lb/>
            ticam vocamus, vid. </s>
            <s xml:id="echoid-s3528" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s3529" xml:space="preserve">4 fig. </s>
            <s xml:id="echoid-s3530" xml:space="preserve">9. </s>
            <s xml:id="echoid-s3531" xml:space="preserve">Acum Chalybeam E F, in me-
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            dio O capitulo aurichalceo inſtructam, excavatam intus, ut pinnæ
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            cupreæ K imponi queat, & </s>
            <s xml:id="echoid-s3532" xml:space="preserve">ſupra eam libere quaquaverſum con-
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            verti: </s>
            <s xml:id="echoid-s3533" xml:space="preserve">Dicitur punctum E, cuſpis Verſorii, F cauda.</s>
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