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="130" file="0144" n="144" rhead="DISSERTATIO"/>
            renatum erat, quod cultro hinc inde ſeparatum ab alia materia,
              <lb/>
            erat purum Plumbum: </s>
            <s xml:id="echoid-s3181" xml:space="preserve">Alia autem duriorque maſſa, in pulverem
              <lb/>
            trita, a Magnete æque fortiter attrahebatur, quam ipſa Arena In-
              <lb/>
            dica, pulvis tamen minus ſplendebat, nec erat tam atri coloris:
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            </s>
            <s xml:id="echoid-s3182" xml:space="preserve">Adeo ut Plumbum non valeat vires attrahentes ex hac Arena proflige-
              <lb/>
            re. </s>
            <s xml:id="echoid-s3183" xml:space="preserve">Cum vero ſolet Minium cum Arena vulgari aut ſilice abire in
              <lb/>
            vitrum, uti quoque ſupra demonſtravimus Magnetem ipſius ope in
              <lb/>
            vitrum mutari, manifeſtum eſt, hanc Virginiæ Arenam non eſſe ter-
              <lb/>
            ram facile penetrabilem aut ſolubilem ab eo metallo, quod iguitum per
              <lb/>
            omnia fere tranſit alia corpora: </s>
            <s xml:id="echoid-s3184" xml:space="preserve">non tamen eſſe ſubſtantiam ſimpli-
              <lb/>
            cem, docuit vis Salis Ammoniaci & </s>
            <s xml:id="echoid-s3185" xml:space="preserve">Nitri in ipſam; </s>
            <s xml:id="echoid-s3186" xml:space="preserve">ex quibus au-
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            tem componatur partibus ſimplicioribus nondum deprehendere po-
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            tui.</s>
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        <div xml:id="echoid-div94" type="section" level="1" n="94">
          <head xml:id="echoid-head102" xml:space="preserve">DE METHODO ARMANDI MAGNETES.</head>
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            <s xml:id="echoid-s3188" xml:space="preserve">Magnes ex fodinis erutus, non ſolet multum Ferri elevare atque
              <lb/>
            geſtare, ideo armatura induitur, qua adjutus multo plus ferreipon-
              <lb/>
            deris gerit, hæc enim ejus vires, cæteroquin quaquaverſum dif-
              <lb/>
            fundendas colligit, dirigit, condenſat, atque eas amborum polo-
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            rum congregat, ut in eandem agant molem ferream, eamque ſimul
              <lb/>
            trahant: </s>
            <s xml:id="echoid-s3189" xml:space="preserve">Inter varias armandi tentatas methodos optimam elegi,
              <lb/>
            quæ huc uſque innotuit, hanc tamen eſſe abſolute perfectiſſimam
              <lb/>
            non niſi temere affirmarem.</s>
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            <s xml:id="echoid-s3191" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s3192" xml:space="preserve">6. </s>
            <s xml:id="echoid-s3193" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3194" xml:space="preserve">3, Fingamus molem Magnetis informem, & </s>
            <s xml:id="echoid-s3195" xml:space="preserve">modo
              <lb/>
            ex fodina erutam proponi, quæ ita ſit armanda, ut plurimum Ferri
              <lb/>
            elevet geratque: </s>
            <s xml:id="echoid-s3196" xml:space="preserve">Circa eam in Tabula poſitam ſpargatur limatura
              <lb/>
            Martis, atque ita invertatur, donec duas exhibeat plagas, ſibi op-
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            poſitas, quæ limaturam in ſeries rectas ordinant. </s>
            <s xml:id="echoid-s3197" xml:space="preserve">Hæ plagæ erunt
              <lb/>
            Magnetis poli, qui accuratiſſime determinabuntur, Acu brevi gra-
              <lb/>
            cilique iis impoſita, quæ perpendiculariter polis inſiſtit, oblique
              <lb/>
            inflexa & </s>
            <s xml:id="echoid-s3198" xml:space="preserve">attracta ab aliis Magnetis lateribus.</s>
            <s xml:id="echoid-s3199" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3200" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3201" xml:space="preserve">Ambo inventa loca ſupra cotem verſatilem, aut planum lapi-
              <lb/>
            dem aſperum, lævigentur & </s>
            <s xml:id="echoid-s3202" xml:space="preserve">applanentur, ut ſuperficiebus ſibi paral-
              <lb/>
            lelis, & </s>
            <s xml:id="echoid-s3203" xml:space="preserve">perpendicularibus ad directionem impoſitæ Acus, </s>
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