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-div58" type="section" level="1" n="58">
          <p>
            <s xml:id="echoid-s2557" xml:space="preserve">
              <pb o="105" file="0119" n="119" rhead="DE MAGNETE."/>
            tes enim nunquam aliquid de virtute amittere, quamvis eodem die
              <lb/>
            plurima ferramenta ipſis applicata fuerint.</s>
            <s xml:id="echoid-s2558" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2559" xml:space="preserve">Eſt hoc profecto admodum paradoxon, nam ſi Magnes tantun-
              <lb/>
            dem ſuæ virtutis cum Ferro communicet, quantum Ferrum recipit,
              <lb/>
            tum ſæpe lamella magnitudinis determinatæ acquiſiviſſet {1/8} partem vi-
              <lb/>
            rium Magnetis, adeoque 8 lamellæ vim æqualem illi, quam Ma-
              <lb/>
            gnes habet, accepiſſent; </s>
            <s xml:id="echoid-s2560" xml:space="preserve">& </s>
            <s xml:id="echoid-s2561" xml:space="preserve">64 lamellæ octies vim totam Magnetis
              <lb/>
            adeptæ fuiſſent, ſive octies orbatus fuiſſet Magnes penitus ſuâ vir-
              <lb/>
            tute: </s>
            <s xml:id="echoid-s2562" xml:space="preserve">verum Magnes eandem vim ſemper conſervat, etiamſi intra
              <lb/>
            horam non modo 64 ferramenta, ſed duplo plura ſuper eo ducan-
              <lb/>
            tur, imo obſervante Normanno, etiamſi 10000 laminæ, Acuſve
              <lb/>
            ipſi affrictæ fuerint.</s>
            <s xml:id="echoid-s2563" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2564" xml:space="preserve">An igitur Magnes novam vim aliunde continuo acquirit, illi æ-
              <lb/>
            qualem, quam communicat? </s>
            <s xml:id="echoid-s2565" xml:space="preserve">Nam ope ex ſe emiſſorum effluvio-
              <lb/>
            rum fieri communicatio nequit, quia horum tam æquabilis & </s>
            <s xml:id="echoid-s2566" xml:space="preserve">ſubita-
              <lb/>
            nea generatio, qualis deſideraretur cum ferramenta plurima ſubito in-
              <lb/>
            tra anguſtiſſimum temporis ſpatium ipſi applicantur, fieri non poteſt.
              <lb/>
            </s>
            <s xml:id="echoid-s2567" xml:space="preserve">Unde igitur hæ vires attrahentes, & </s>
            <s xml:id="echoid-s2568" xml:space="preserve">tam æquabili copia accedent ad
              <lb/>
            Magnetem, ut nihil ullo affrictu hic amiſiſſe videatur? </s>
            <s xml:id="echoid-s2569" xml:space="preserve">An non potius
              <lb/>
            Lapis nihil de ſua ſubſtantia communicat cum ferro, ſed tantum vim,
              <lb/>
            in metallo ſemper latentem, excitat, & </s>
            <s xml:id="echoid-s2570" xml:space="preserve">quietam deducit in actum? </s>
            <s xml:id="echoid-s2571" xml:space="preserve">Nam
              <lb/>
            nonnunquam contingit, ut Ferrum ſuper Magnete ductum, majus
              <lb/>
            pondus elevet, quam ipſe Magnes, obſervante de la Hirio in
              <lb/>
            L’Hiſt. </s>
            <s xml:id="echoid-s2572" xml:space="preserve">de L’Acad. </s>
            <s xml:id="echoid-s2573" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s2574" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s2575" xml:space="preserve">1717. </s>
            <s xml:id="echoid-s2576" xml:space="preserve">Hic virium in Ferro ſupra Ma-
              <lb/>
            gnetem exceſſus, an ab ipſo Magnete orietur? </s>
            <s xml:id="echoid-s2577" xml:space="preserve">tum minus erit in
              <lb/>
            cauſa quam in effectu, quod repugnat: </s>
            <s xml:id="echoid-s2578" xml:space="preserve">ſed ſi vis major in Ferro la-
              <lb/>
            tuerit, quæ a Magnete in actum modo deducitur, intelligi poteſt
              <lb/>
            aliquid, ut & </s>
            <s xml:id="echoid-s2579" xml:space="preserve">quomodo Magnes in innumeris ferramentis eodem
              <lb/>
            die vim excitaverit. </s>
            <s xml:id="echoid-s2580" xml:space="preserve">demonſtrari hic tamen poteſt nihil.</s>
            <s xml:id="echoid-s2581" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div59" type="section" level="1" n="59">
          <head xml:id="echoid-head67" xml:space="preserve">EXPERIMENTUM XXXIX.</head>
          <p>
            <s xml:id="echoid-s2582" xml:space="preserve">Magnes multo fortius attrahit Ferrum purum, quam rubiginoſum:
              <lb/>
            </s>
            <s xml:id="echoid-s2583" xml:space="preserve">quia rubigo eſt ſpecies Vitrioli, ſive Sal mixtum cum Ferri particu-
              <lb/>
            lis; </s>
            <s xml:id="echoid-s2584" xml:space="preserve">demonſtravimus autem ſupra in Chemicâ Magnetis Analyſi,
              <lb/>
            Salem vires Magneticas coërcere, atque ad ſilentium deducere, </s>
          </p>
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