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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          <p>
            <s xml:id="echoid-s2892" xml:space="preserve">
              <pb o="119" file="0133" n="133" rhead="DE MAGNETE."/>
            ordinata, tum invertatur Magnes, & </s>
            <s xml:id="echoid-s2893" xml:space="preserve">altero polo ſurſum ſpectante,
              <lb/>
            commoveatur; </s>
            <s xml:id="echoid-s2894" xml:space="preserve">primo limatura hærebit quaſi anceps, neſcia quor-
              <lb/>
            ſum ſe vertat cadatque, ſed repetito Magnetis itu erigitur, & </s>
            <s xml:id="echoid-s2895" xml:space="preserve">cadit
              <lb/>
            contraria directione, quam qua Magnes movebatur.</s>
            <s xml:id="echoid-s2896" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2897" xml:space="preserve">Si autem ſupra limaturam Ferri Magnetem protraxeris, erigitur
              <lb/>
            rectà ea limaturæ pars, quæ Magneti ſubjacet, cæteroquin ſequitur
              <lb/>
            motum Magnetis, unde ipſo moto dextrorſum, limatura cadit dex-
              <lb/>
            trorſum, & </s>
            <s xml:id="echoid-s2898" xml:space="preserve">contra: </s>
            <s xml:id="echoid-s2899" xml:space="preserve">Optime fit hoc Experimentum limaturam ſpar-
              <lb/>
            gendo ſupra tenues laminas metallicas: </s>
            <s xml:id="echoid-s2900" xml:space="preserve">Lucretius quondam hoc in-
              <lb/>
            ſtituiſſe videtur, cum canebat,
              <lb/>
            Exſultare etiam Samothracia ferrea vidi,
              <lb/>
            Et ramenta ſimul Ferri furere intus ahenis
              <lb/>
            In ſcaphis, lapis hic Magnes cum ſubditus eſſet,
              <lb/>
            Vſque adeo fugere a ſaxo geſtire videtur
              <lb/>
            Ære interpoſito, diſcordia tanta creatur.</s>
            <s xml:id="echoid-s2901" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2902" xml:space="preserve">Quemadmodum eriguntur caduntque partes ſcobis in hoc Experi-
              <lb/>
            mento, ita erigi diſponique partes in ſolido Ferro, quod Magneti
              <lb/>
            aſſricatur, opinatus fuit Gaſſendus, ideoque in Ferro partes jacere
              <lb/>
            ſiniſtrorſum Magnete ſuper ipſo ducto dextrorſum, & </s>
            <s xml:id="echoid-s2903" xml:space="preserve">contra, veluti
              <lb/>
            campus frumento conſitus ariſtas verſus unum latus a vento afflante
              <lb/>
            jacentes gerit, & </s>
            <s xml:id="echoid-s2904" xml:space="preserve">in oppoſitum protenſas a vento contrario. </s>
            <s xml:id="echoid-s2905" xml:space="preserve">Attamen
              <lb/>
            mihi partes ſolidi Ferri fortius cohærere videntur, quam ut a vi
              <lb/>
            Magnetica ita ordinarentur: </s>
            <s xml:id="echoid-s2906" xml:space="preserve">ſedeo conceſſo, non clarius intelligitur,
              <lb/>
            quomodo ex ejuſmodi partium ſitu vis attrahendi aliud Ferrum ſe-
              <lb/>
            quetur, aut quid ſitus ad directionem Ferri verſus aliquas cæli pla-
              <lb/>
            gas conferet, niſi fluidum advocetur.</s>
            <s xml:id="echoid-s2907" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2908" xml:space="preserve">Explicantur autem memorata phænomena facile, modo in ante-
              <lb/>
            ceſſum notemus, parva fragmenta Acuum oblonga, loco ſcobis
              <lb/>
            impoſita plano, a Magnete infra moto, plane eodem modo erigi, & </s>
            <s xml:id="echoid-s2909" xml:space="preserve">
              <lb/>
            cadere ad oppoſitam partem ac Magnes movetur; </s>
            <s xml:id="echoid-s2910" xml:space="preserve">Quare ſcobs po-
              <lb/>
            terit| conſiderari, inſtar congeriei exiguorum, ſed oblongorum fra-
              <lb/>
            gmentorum: </s>
            <s xml:id="echoid-s2911" xml:space="preserve">Concipiatur Magnes directe infra unam particulam,
              <lb/>
            hæc erigetur ſupra planum perpendiculariter, atque ambas extre-
              <lb/>
            mitates nanciſcitur polares, quarum ea, quæ plano contigua, eſt
              <lb/>
            polus alterius nominis, quam Magnetis, planum ibi tangentis, (poli
              <lb/>
            enim Magnetum diverſi nominis tantum ſe attrahunt), </s>
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