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-div134" type="section" level="1" n="134">
          <pb o="235" file="0249" n="249" rhead="DE MAGNETE."/>
        </div>
        <div xml:id="echoid-div135" type="section" level="1" n="135">
          <head xml:id="echoid-head144" xml:space="preserve">CAPUT QUARTUM.</head>
          <p style="it">
            <s xml:id="echoid-s5552" xml:space="preserve">De actione Ferri, donati viribus Magneticis, in aliud Ferrum,
              <lb/>
            ſive purum, ſive viribus Magneticis imprægnatum.</s>
            <s xml:id="echoid-s5553" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5554" xml:space="preserve">Quoniam Ferrum, viribus Magneticis donatum, non differt a
              <lb/>
            Magneteipſo, ſive vim attractricem, quam in alterum exercet
              <lb/>
            Ferrum, ſive directricem, ſive communicantem virtutem
              <lb/>
            cum alio ſpectemus, ſuperſedere potuiſſem examini Ferri, quate-
              <lb/>
            nus attrahendo aliud, virtutem ſuam Magneticam oſtendit: </s>
            <s xml:id="echoid-s5555" xml:space="preserve">attamen
              <lb/>
            non licuit Magnetem omnibus tractare modis, quibus Ferrum agi-
              <lb/>
            tari poteſt; </s>
            <s xml:id="echoid-s5556" xml:space="preserve">non enim licuit lapidem inflectere in quamlibet formam,
              <lb/>
            nec unum circa alterum intorquere, nec prolongare, ipſum per fo-
              <lb/>
            ramen trahendo, nec cudendo figuram immutare, quibus inſlexio-
              <lb/>
            nibus & </s>
            <s xml:id="echoid-s5557" xml:space="preserve">mutationibus ductile metallum ſubjicitur; </s>
            <s xml:id="echoid-s5558" xml:space="preserve">igitur reſtabat
              <lb/>
            explorandum, quomodo virtus Magnetica ſe in Ferro haberet, quod
              <lb/>
            aliis diverſiſque tractatur & </s>
            <s xml:id="echoid-s5559" xml:space="preserve">torquetur modis, quam hucuſque exa-
              <lb/>
            minari Magnes potuit.</s>
            <s xml:id="echoid-s5560" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div136" type="section" level="1" n="136">
          <head xml:id="echoid-head145" xml:space="preserve">EXPERIMENTUM CX.</head>
          <p>
            <s xml:id="echoid-s5561" xml:space="preserve">Scriptum video apud nonnullos Philoſophos, vim Magneticam
              <lb/>
            ex lamina Chalybea decreſcere, ſi ipſi alia tenuia, & </s>
            <s xml:id="echoid-s5562" xml:space="preserve">non grandia
              <lb/>
            ferramenta, nunquam ſuper Magnete ducta, affricentur; </s>
            <s xml:id="echoid-s5563" xml:space="preserve">ſed vim in-
              <lb/>
            tegram permanere, applicatis corporibus majoribus, quorum nimia
              <lb/>
            moles, ſpretis quaſi tenuioris laminæ Magneticis viribus, nihil
              <lb/>
            earum ſecum abriperet: </s>
            <s xml:id="echoid-s5564" xml:space="preserve">Hæc ſententia ſi vera foret, haud parum
              <lb/>
            quaſſaret ea, quæ de Magnete in Capite Secundo. </s>
            <s xml:id="echoid-s5565" xml:space="preserve">Experimento.
              <lb/>
            </s>
            <s xml:id="echoid-s5566" xml:space="preserve">XXXVIII. </s>
            <s xml:id="echoid-s5567" xml:space="preserve">diximus, Magnetem ſcilicet nunquam aliquid ſuarum
              <lb/>
            amittere virium, quamvis ſexcenta ſuper ipſo ducta brevi tempore
              <lb/>
            fuiſſent ferramenta, tenuia, brevia, craſſa ſive longa fuerint; </s>
            <s xml:id="echoid-s5568" xml:space="preserve">hinc
              <lb/>
            ſuſpicabar non cum ſatis ſollicita attentione & </s>
            <s xml:id="echoid-s5569" xml:space="preserve">prudentia experimen-
              <lb/>
            tum cum Ferro fuiſſe captum, neque irritam me foviſſe ſuſpicio-
              <lb/>
            nem docuit experientia: </s>
            <s xml:id="echoid-s5570" xml:space="preserve">Lamina Chalybea 12 longa pollices, {3/4} </s>
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