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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        <div xml:id="echoid-div102" type="section" level="1" n="102">
          <head xml:id="echoid-head110" xml:space="preserve">CAPUT TERTIUM.</head>
          <head xml:id="echoid-head111" xml:space="preserve">De Directione Magnetis & Ferri ſuper ipſo
            <lb/>
          ducti.</head>
          <p>
            <s xml:id="echoid-s3320" xml:space="preserve">Donatus eſt Magnes plerumque duobus polis, qui ſunt plagæ
              <lb/>
            alicujus latitudinis, non puncta Mathematica, inſtar polo-
              <lb/>
            rum terreſtrium, aut coeleſtium: </s>
            <s xml:id="echoid-s3321" xml:space="preserve">Supra memoravimus vim attrahen-
              <lb/>
            tem Magnetis maximam ab hiſce polis exerceri; </s>
            <s xml:id="echoid-s3322" xml:space="preserve">qui ideo facile de-
              <lb/>
            teguntur, circumquaque circa Magnetem Ferrum applicando, & </s>
            <s xml:id="echoid-s3323" xml:space="preserve">
              <lb/>
            explorando quibuſnam in locis id fortiſſime attrahatur: </s>
            <s xml:id="echoid-s3324" xml:space="preserve">Innoteſcunt
              <lb/>
            tamen facilius ope Scobis ferreæ circumſperſæ, vel Acum nauti-
              <lb/>
            cam ſupra Stylum mobilem circumducendo, quæ maximo cum
              <lb/>
            impetu verſus hos polos dirigetur.</s>
            <s xml:id="echoid-s3325" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3326" xml:space="preserve">Sunt aliquando bini poli ſibi in recta diametraliter oppoſiti, ali-
              <lb/>
            quando in curva: </s>
            <s xml:id="echoid-s3327" xml:space="preserve">Non quoque in omnibus Magnetibus neceſſario
              <lb/>
            duo tantum poli deprehenduntur, quippe & </s>
            <s xml:id="echoid-s3328" xml:space="preserve">ipſe vidi, atque alii nota-
              <lb/>
            verunt Auctores, Magnetes, in quibus tres, idem teſtante Fournierio,
              <lb/>
            tum in quibus quatuor manifeſto poli obſervabantur: </s>
            <s xml:id="echoid-s3329" xml:space="preserve">Cl. </s>
            <s xml:id="echoid-s3330" xml:space="preserve">Pugettus
              <lb/>
            in Tractatu Experimentorum Magneticorum Sermone Gallico con-
              <lb/>
            ſcriptorum, Magnetis meminit, vide Tab. </s>
            <s xml:id="echoid-s3331" xml:space="preserve">7. </s>
            <s xml:id="echoid-s3332" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3333" xml:space="preserve">1. </s>
            <s xml:id="echoid-s3334" xml:space="preserve">Sphærici
              <lb/>
            A B C D, pedi eburneo inſiſtentis, a cujus polo A, Acus nauticæ cuſpis
              <lb/>
            attrahitur, quæ a parte, priori oppoſita, C, etiam allicitur, indi-
              <lb/>
            cio A & </s>
            <s xml:id="echoid-s3335" xml:space="preserve">C eſſe polos cognomines: </s>
            <s xml:id="echoid-s3336" xml:space="preserve">a parte B attrahitur ejuſdem A-
              <lb/>
            cus cauda, quam pariter allicit oppoſitum punctum D: </s>
            <s xml:id="echoid-s3337" xml:space="preserve">poſſidet A-
              <lb/>
            cuum nauticarum artifex inſignis Rotterodamenſis, Dykgraaf, Ma-
              <lb/>
            gnetem, quem mihi explorandum accommodavit, formæ utcun-
              <lb/>
            que cubicæ, quam repræſentat Tab. </s>
            <s xml:id="echoid-s3338" xml:space="preserve">7. </s>
            <s xml:id="echoid-s3339" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3340" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3341" xml:space="preserve">in cujus latere ante-
              <lb/>
            riori N, Z, ſunt duo poli, quorum unus N eſt Boreus, alter Z Au-
              <lb/>
            ſtralis, latus N Z priori oppoſitum, etiam duos habet polos, quo-
              <lb/>
            rum hic N eſt Boreus, alter Z Auſtralis: </s>
            <s xml:id="echoid-s3342" xml:space="preserve">penes eundem artificem
              <lb/>
            alius proſtat Magnes formæ oblongæ, Tab. </s>
            <s xml:id="echoid-s3343" xml:space="preserve">7. </s>
            <s xml:id="echoid-s3344" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s3345" xml:space="preserve">3. </s>
            <s xml:id="echoid-s3346" xml:space="preserve">in quo pri-
              <lb/>
            mum tres obſervabantur poli, unus B Boreus, erant M, M. </s>
            <s xml:id="echoid-s3347" xml:space="preserve">duo Meri-
              <lb/>
            dionales, Magnete autem diviſo ſectione F K, fragmentum A </s>
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