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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            <s xml:id="echoid-s6063" xml:space="preserve">
              <pb o="256" file="0270" n="270" rhead="DISSERTATIO"/>
            ejuſmodi vim directricem obſervare potui, imo etiamſi aliquotin
              <lb/>
            Meridiano eodem jacuerint diebus.</s>
            <s xml:id="echoid-s6064" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6065" xml:space="preserve">Ecce aliquam Analogiam inter vim Magnetis in Ferrum, & </s>
            <s xml:id="echoid-s6066" xml:space="preserve">
              <lb/>
            inter vim univerſalem Magneticam, pendentem ex Magnete in
              <lb/>
            imo Terræ concluſo, & </s>
            <s xml:id="echoid-s6067" xml:space="preserve">Ferrum: </s>
            <s xml:id="echoid-s6068" xml:space="preserve">Magnes poſtulat lamellas fer-
              <lb/>
            reas certæ tantum craſſitiei, quibus ſuam vim communicat, il-
              <lb/>
            lam nequaquam craſſioribus impreſſurus: </s>
            <s xml:id="echoid-s6069" xml:space="preserve">Eodem modo Ferrum
              <lb/>
            deſideratur certæ longitudinis & </s>
            <s xml:id="echoid-s6070" xml:space="preserve">craſſitiei, quod ſibi commiſſum
              <lb/>
            ſponte vim Magneticam acquirat: </s>
            <s xml:id="echoid-s6071" xml:space="preserve">Non dubito, quin omne Fer-
              <lb/>
            rum, utcunque craſſum, vi Magnetica imprægnari poſſit, modo ſit
              <lb/>
            ſatis longum; </s>
            <s xml:id="echoid-s6072" xml:space="preserve">ſed proportio inter craſſitiem & </s>
            <s xml:id="echoid-s6073" xml:space="preserve">longitudinem re-
              <lb/>
            quiritur, qualis hæc ſit, defectu ſufficientium Experimentorum,
              <lb/>
            nondum mihi conſtat.</s>
            <s xml:id="echoid-s6074" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6075" xml:space="preserve">Addunt, & </s>
            <s xml:id="echoid-s6076" xml:space="preserve">recte, autores harum obſervationum, Ferrum can-
              <lb/>
            defactum & </s>
            <s xml:id="echoid-s6077" xml:space="preserve">in Meridiano poſitum, ocyus vi Magnetica dire-
              <lb/>
            ctrice imbui, quam Ferrum frigidum. </s>
            <s xml:id="echoid-s6078" xml:space="preserve">Ferrum igitur tenue, & </s>
            <s xml:id="echoid-s6079" xml:space="preserve">
              <lb/>
            longum, ſua ſponte vim directricem acquirit, qua Acus nauticæ
              <lb/>
            ſive Verſoria aguntur, modo aliquamdiu in Meridiano jacuerit,
              <lb/>
            quamobrem abſque Magnetis auxilio Verſorium haberi poteſt, & </s>
            <s xml:id="echoid-s6080" xml:space="preserve">
              <lb/>
            directio ejus explorari: </s>
            <s xml:id="echoid-s6081" xml:space="preserve">Tenuem enim & </s>
            <s xml:id="echoid-s6082" xml:space="preserve">longam cape virgam,
              <lb/>
            quam per medium parvi ſuberis transfige, ut aquæ innatet in
              <lb/>
            labro magno, poſito in loco valde tranquillo, hujus cuſpidem
              <lb/>
            verſus Boream, haud aliter quam Verſorium, dirigi obſervabis,
              <lb/>
            lento tamen hæc converſio & </s>
            <s xml:id="echoid-s6083" xml:space="preserve">directio abſolvitur motu: </s>
            <s xml:id="echoid-s6084" xml:space="preserve">Idem
              <lb/>
            fit ſuſpenſâ virgâ ex filo tenuiſſimo, ſerico, non intorto, uti
              <lb/>
            monet Gilbertus Lib. </s>
            <s xml:id="echoid-s6085" xml:space="preserve">1. </s>
            <s xml:id="echoid-s6086" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s6087" xml:space="preserve">12. </s>
            <s xml:id="echoid-s6088" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s6089" xml:space="preserve">32. </s>
            <s xml:id="echoid-s6090" xml:space="preserve">Adeoque vis, quam
              <lb/>
            Magnes Terræ interior cum Ferro communicat, non deſtruitur
              <lb/>
            illico, ſed aliquamdiu permanens, efficit ut Ferri pars, quæ ul-
              <lb/>
            timo Boream ſpectavit, pergat converti ad Boream.</s>
            <s xml:id="echoid-s6091" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div160" type="section" level="1" n="160">
          <head xml:id="echoid-head170" xml:space="preserve">EXPERIMENTUM CXXXIII.</head>
          <p>
            <s xml:id="echoid-s6092" xml:space="preserve">Quemadmodum in tentamine ſuperiori Ferrum in Meridiano
              <lb/>
            poſitum exploratum fuit, ita examinandum erat, quid continge-
              <lb/>
            ret in Ferro jacente parallele ad Æquatorem Terræ ſitu prio-
              <lb/>
            rem ad angulos rectos ſecante: </s>
            <s xml:id="echoid-s6093" xml:space="preserve">Proinde virga ferrea </s>
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