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-div158" type="section" level="1" n="158">
          <p>
            <s xml:id="echoid-s6043" xml:space="preserve">
              <pb o="255" file="0269" n="269" rhead="DE MAGNETE."/>
            Verſorii polum; </s>
            <s xml:id="echoid-s6044" xml:space="preserve">id tamen ſi deprehenderetur in uno Ferro, non in
              <lb/>
            duobus aliis quoque obtineret, fatemur enim aliquando, raro ta-
              <lb/>
            men, fila dari, quorum ambo extrema eundem polum attrahunt
              <lb/>
            Verſorii, id vero nobis in tribus diverſis occaſionibus obſervari con-
              <lb/>
            tigit cum calido Ferro, nunquam contrarium: </s>
            <s xml:id="echoid-s6045" xml:space="preserve">adeoque vel non
              <lb/>
            datur vis directrix in calente Ferro, aut erit infinite parva:</s>
            <s xml:id="echoid-s6046" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div159" type="section" level="1" n="159">
          <head xml:id="echoid-head169" xml:space="preserve">EXPERIMENTUM CXXXII.</head>
          <p>
            <s xml:id="echoid-s6047" xml:space="preserve">Si virgæ ferreæ tenuiſſimæ, Experimenti CXXXI, in Igne can-
              <lb/>
            defactæ, prudenter abſque ullâ concuſſione ex eo ſublatæ forcipe æ-
              <lb/>
            neo, ita ut horæ ſpatio jaceat in Meridiano terreſtri vel Magne-
              <lb/>
            tico ſuper lapideo ſolo, cuſpis Borea apponatur Verſorii polo Au-
              <lb/>
            ftrali, eum attrahet, ſed polum Boreum fugabit: </s>
            <s xml:id="echoid-s6048" xml:space="preserve">cuſpis autem Au-
              <lb/>
            ftralis virgæ attrahet Verſorii polum Boreum, fugabit Auſtralem.</s>
            <s xml:id="echoid-s6049" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6050" xml:space="preserve">Virgæ cylindricæ longæ & </s>
            <s xml:id="echoid-s6051" xml:space="preserve">tenues quæcunque, ſupra quas cor-
              <lb/>
            tinæ feneſtrarum aut cubilium vulgo protrahuntur, jacentes ali-
              <lb/>
            quamdiu horizonti parallelæ, & </s>
            <s xml:id="echoid-s6052" xml:space="preserve">in Meridiano terreſtri vel Magne-
              <lb/>
            tico, ſive ſolo impoſitæ, ſive altiores & </s>
            <s xml:id="echoid-s6053" xml:space="preserve">in aëre ſuſpenſæ, eadem
              <lb/>
            vi Magnetica directrice imbuuntur, atque cuſpidibus ſuis, quibus
              <lb/>
            Boream ſpectarunt, attrahunt Acûs Magneticæ polum Auſtralem,
              <lb/>
            repellunt Boreum.</s>
            <s xml:id="echoid-s6054" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6055" xml:space="preserve">Obſervationem addam, ex quâ conſtabit Philoſophos plerumque
              <lb/>
            univerſalius proprietates Magnetis determinaſſe, neque fideliter
              <lb/>
            omnia, quæ in inſtituendo Experimento adhibuerint, accurate anno-
              <lb/>
            taſſe, quemadmodum tamen deſideratur, unde multiplici edoctus
              <lb/>
            experientiâ, cuncta, ne minimis circumſtantiis exceptis, addidi,
              <lb/>
            quibus prolixior quidem nonnullis videri poſſem, ſed niſi omnia
              <lb/>
            ſimul notentur, & </s>
            <s xml:id="echoid-s6056" xml:space="preserve">inter ſe comparentur, in errores incidimus:
              <lb/>
            </s>
            <s xml:id="echoid-s6057" xml:space="preserve">Ecquis igitur, primâ fronte memorata hic Experimenta intuitus,
              <lb/>
            non pronunciaret, Ferrum in Meridiano poſitum vi Magnetica di-
              <lb/>
            rectrice imprægnari: </s>
            <s xml:id="echoid-s6058" xml:space="preserve">Sed lente feſtina, nam cum longis, & </s>
            <s xml:id="echoid-s6059" xml:space="preserve">te-
              <lb/>
            nuibus virgis capta duntaxat ſunt tentamina, an quidem eadem ob-
              <lb/>
            tinctbunt phænomena in craſſis? </s>
            <s xml:id="echoid-s6060" xml:space="preserve">Videamus & </s>
            <s xml:id="echoid-s6061" xml:space="preserve">hæc exploremus, ne-
              <lb/>
            que laboris pœnitebit: </s>
            <s xml:id="echoid-s6062" xml:space="preserve">Nam in ferramentis diametri unius pollicis,
              <lb/>
            aut craſſioribus, verum brevioribus quam 8 vel 10 poll. </s>
            <s xml:id="echoid-s6063" xml:space="preserve"/>
          </p>
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