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-div161" type="section" level="1" n="161">
          <p>
            <s xml:id="echoid-s6150" xml:space="preserve">
              <pb o="259" file="0273" n="273" rhead="DE MAGNETE."/>
            in Experimentis attendendum ſit, plurimaque nimia feſtinatione
              <lb/>
            peragi, breviuſque deſcribi, quam oportebat; </s>
            <s xml:id="echoid-s6151" xml:space="preserve">tum quam parum
              <lb/>
            liceat ratiocinari in Phyſicis, atque ex uno obſervati genere con-
              <lb/>
            cluſionem generalem formare, id enim omnes memoratos Erudi-
              <lb/>
            tos in errorem conjecit; </s>
            <s xml:id="echoid-s6152" xml:space="preserve">particularis obſervatio omnium erat vera
              <lb/>
            in Ferro illo, quocum Experimenta inſtituerunt; </s>
            <s xml:id="echoid-s6153" xml:space="preserve">ſed non in omni
              <lb/>
            alio cujuſlibet longitudinis & </s>
            <s xml:id="echoid-s6154" xml:space="preserve">craſſitiei.</s>
            <s xml:id="echoid-s6155" xml:space="preserve"/>
          </p>
          <p style="it">
            <s xml:id="echoid-s6156" xml:space="preserve">Animadverti poſtea hoc olim fuiſſe optime memoriæ traditum in
              <lb/>
            Philoſ. </s>
            <s xml:id="echoid-s6157" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s6158" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s6159" xml:space="preserve">214, Anno 1694, â quodam anonymo, qui
              <lb/>
            Gilberti obſervationi hæc addit. </s>
            <s xml:id="echoid-s6160" xml:space="preserve">Sed hæc modo locum habet in non-
              <lb/>
            nullis caſibus, quando enim virga brevis eſt, non formari in ea
              <lb/>
            poterit polus hoc modo: </s>
            <s xml:id="echoid-s6161" xml:space="preserve">Cape filum rotundum, diametri {1/5} pollic. </s>
            <s xml:id="echoid-s6162" xml:space="preserve">lon-
              <lb/>
            gitudinis 10 pollicum, in eo non excitabis polum, licet igni commi-
              <lb/>
            ſeris: </s>
            <s xml:id="echoid-s6163" xml:space="preserve">ſed ſi hoc filum ſit longius, veluti 30 pollic. </s>
            <s xml:id="echoid-s6164" xml:space="preserve">tum candefactum
              <lb/>
            polo concipiendo eſt idoneum. </s>
            <s xml:id="echoid-s6165" xml:space="preserve">Ita cape virgamrotundam, diametri
              <lb/>
            unius pollicis, & </s>
            <s xml:id="echoid-s6166" xml:space="preserve">30 pollices longam, hæc non erit apta concipiendo
              <lb/>
            poto. </s>
            <s xml:id="echoid-s6167" xml:space="preserve">Deinde addit, non datur virga tam brevis, quin apta ſit po-
              <lb/>
            lo, modo ſatis attenuetur. </s>
            <s xml:id="echoid-s6168" xml:space="preserve">Terminus longitudinis requiſitus pro
              <lb/>
            uniuscujusque craſſitie plus increſcit, quam imaginari poſſemus:
              <lb/>
            </s>
            <s xml:id="echoid-s6169" xml:space="preserve">Utinam hæc Experimenta vir accuratiſſimus adnectere voluiſſet!
              <lb/>
            videtur ea de induſtria omiſiſſe, quaſi parum utilia, quæ tamen,
              <lb/>
            me judice, forent inter utiliſſima ponenda.</s>
            <s xml:id="echoid-s6170" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div162" type="section" level="1" n="162">
          <head xml:id="echoid-head172" xml:space="preserve">EXPERIMENTUM CXXXV.</head>
          <p>
            <s xml:id="echoid-s6171" xml:space="preserve">Virgam ferream tenuem, quæ Experimento CXXXI. </s>
            <s xml:id="echoid-s6172" xml:space="preserve">inſervierat,
              <lb/>
            iterum candefeci in Igne, quam in volſella ænea arreptam, hori-
              <lb/>
            zontaliter tenui, ut tamen ſemper in Meridiano terreſtri eſſet, hu-
              <lb/>
            jus partem dimidiam, Auſtro obverſam, extinxi in Aquâ, ita ut
              <lb/>
            fere manſerit horizontalis, quo facto, virgæ cuſpis Auſtralis, & </s>
            <s xml:id="echoid-s6173" xml:space="preserve">
              <lb/>
            Borea attrahebat Verſorii polum Boreum.</s>
            <s xml:id="echoid-s6174" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6175" xml:space="preserve">Ejuſdem virgæ iterum candefactæ partem dimidiam Boreæ ob-
              <lb/>
            verſam in Aquâ extinxi, manente altero dimidio extra aquam; </s>
            <s xml:id="echoid-s6176" xml:space="preserve">tum
              <lb/>
            virgæ cuſpis Borea fugavit Verſorii polum Boreum, & </s>
            <s xml:id="echoid-s6177" xml:space="preserve">attraxit Au-
              <lb/>
            ſtralem, quæ phænomena clarius intelligentur explicato Experimen-
              <lb/>
            to ſequenti.</s>
            <s xml:id="echoid-s6178" xml:space="preserve"/>
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