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="65" file="0079" n="79" rhead="DE MAGNETE."/>
            <s xml:id="echoid-s1524" xml:space="preserve">Sed Gaſſendum rogo, an marmor, feſtucæ aliave corpuſcula non
              <lb/>
            habeant partes ſolidas? </s>
            <s xml:id="echoid-s1525" xml:space="preserve">concedam in iis poros eſſe diverſiſſimo fabre-
              <lb/>
            factos modo ab iis in Ferro, nihilominus radii Magnetici, quos Ef-
              <lb/>
            fluvia corporea eſſe ſupponit, partibus ſolidis marmoris occurrent, ut-
              <lb/>
            cunque paucas habuerit marmor, utcunque poris rectis donatas id
              <lb/>
            ſtatuatur, ferrum contra intortis; </s>
            <s xml:id="echoid-s1526" xml:space="preserve">adeoque radii aliqualem motum,
              <lb/>
            etiamſi parvum, marmori feſtucisque dabunt, ſed nihil percipitur
              <lb/>
            communicari cum feſtucis levibus, marmore metallisve aliis, quam-
              <lb/>
            obrem hæc opinio corruit.</s>
            <s xml:id="echoid-s1527" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1528" xml:space="preserve">Præterea quæro, quam ob rationem fluidum illud moveatur verſus
              <lb/>
            A? </s>
            <s xml:id="echoid-s1529" xml:space="preserve">an hæc eſt vis attractrix Magnetis? </s>
            <s xml:id="echoid-s1530" xml:space="preserve">tum attractio corporum ad
              <lb/>
            ſe in vicem per aliam attractionem æque obſcuram explicabitur; </s>
            <s xml:id="echoid-s1531" xml:space="preserve">quod
              <lb/>
            eſt abſurdum. </s>
            <s xml:id="echoid-s1532" xml:space="preserve">Inſuper quare illud fluidum eo vehementius aget in a-
              <lb/>
            lio corpore pellendo, quo hoc Magneti eſt propius, niſi ejus mo-
              <lb/>
            tus perpetuo acceleretur, ſed quænam erit cauſa hujus accelerati
              <lb/>
            motus? </s>
            <s xml:id="echoid-s1533" xml:space="preserve">niſi vis attractrix Magnetica ſupponatur, agens diverſis vi-
              <lb/>
            ribus ad varias diſtantias.</s>
            <s xml:id="echoid-s1534" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1535" xml:space="preserve">Denuo ſit Magnes in A, ferrum in E, aliudque in F, hæc ambo
              <lb/>
            accedent ad Magnetem vi validâ, & </s>
            <s xml:id="echoid-s1536" xml:space="preserve">undiquaque circa A poſita cor-
              <lb/>
            puſcula ferrea accedent ad Magnetem, qui acceſſus argueret flui-
              <lb/>
            dum quaquaverſum accedere ad Magnetem; </s>
            <s xml:id="echoid-s1537" xml:space="preserve">ubi hoc fluidum ma-
              <lb/>
            net, an egreditur iterum ex Magnete? </s>
            <s xml:id="echoid-s1538" xml:space="preserve">Forte patroni illius hoc ſtatuent
              <lb/>
            & </s>
            <s xml:id="echoid-s1539" xml:space="preserve">ex repulſione id affirmabunt: </s>
            <s xml:id="echoid-s1540" xml:space="preserve">ſed ſciant hi velim, omnem repul-
              <lb/>
            ſionem in experimentis detectam eſſe multo imbecilliorem attra-
              <lb/>
            ctione, ut cuilibet experimenta noſtra comparanti apparebit: </s>
            <s xml:id="echoid-s1541" xml:space="preserve">ecce
              <lb/>
            igitur majori vi & </s>
            <s xml:id="echoid-s1542" xml:space="preserve">copia affluet ad Magnetem fluidum quam ex eo
              <lb/>
            exibit; </s>
            <s xml:id="echoid-s1543" xml:space="preserve">quare opplebuntur breviori vel longiori tempore ejus pori
              <lb/>
            omnino, & </s>
            <s xml:id="echoid-s1544" xml:space="preserve">vis Magnetica peribit; </s>
            <s xml:id="echoid-s1545" xml:space="preserve">quod iterum non obſervatur
              <lb/>
            contingere, nam Magnetes eandem vim retinere deprehenduntur per
              <lb/>
            plurima annorum ſpatia.</s>
            <s xml:id="echoid-s1546" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1547" xml:space="preserve">Tandem ſit Ferrum in F, immobile poſitum ſupra menſam, & </s>
            <s xml:id="echoid-s1548" xml:space="preserve">
              <lb/>
            Magnes ex Libra ſuſpenſus in A; </s>
            <s xml:id="echoid-s1549" xml:space="preserve">ſit fluidum motum directione F A
              <lb/>
            quod pellat Ferrum verſus Magnetem, & </s>
            <s xml:id="echoid-s1550" xml:space="preserve">ſit hæc vis accuratiſſime
              <lb/>
            ponderata, interF & </s>
            <s xml:id="echoid-s1551" xml:space="preserve">A tum immediate infraF ponatur cubus plumbiut-
              <lb/>
            cunque craſſus, an hic non impediet aliquomodo affluxum fluidi verſus
              <lb/>
            A? </s>
            <s xml:id="echoid-s1552" xml:space="preserve">ſi non impediat, plumbum penitus poroſum absque partibus </s>
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