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-s5633" xml:space="preserve">
              <pb o="239" file="0253" n="253" rhead="DE MAGNETE."/>
            ceſſit ad Ferrum, pori ejus non ſunt obturati, ſed parum mutati,
              <lb/>
            vis tamen Magnetica prius communicata, nunc abolita eſt; </s>
            <s xml:id="echoid-s5634" xml:space="preserve">idem
              <lb/>
            obſervavimus in Ferro, quod Magneticis donatum viribus, cum
              <lb/>
            cuderetur, eas penitus perdebat, quo etiam ſitus partium me-
              <lb/>
            talli tantummodo immutabatur. </s>
            <s xml:id="echoid-s5635" xml:space="preserve">Eſt igitur cauſa Magnetica illius
              <lb/>
            indolis, ut eum ſitum partium poſtulet in Ferro toto, quem id ha-
              <lb/>
            buit, cum ſuper Magnete ducebatur; </s>
            <s xml:id="echoid-s5636" xml:space="preserve">& </s>
            <s xml:id="echoid-s5637" xml:space="preserve">pereat vel avolet, Ferro
              <lb/>
            inducta quacunque alia partium alicubi, vel per totam maſſam diſ-
              <lb/>
            poſitione, in eo tamen vigere aut reviviſcere poteſt, modo Fer-
              <lb/>
            rum ita inflexum denuo Magneti aſſricetur: </s>
            <s xml:id="echoid-s5638" xml:space="preserve">id autem mirandum,
              <lb/>
            quod non maneat vis ſuperſtes in parte Ferri non Flexa, cujus par-
              <lb/>
            tes eundem ſitum retinuerunt.</s>
            <s xml:id="echoid-s5639" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div140" type="section" level="1" n="140">
          <head xml:id="echoid-head149" xml:space="preserve">EXPERIMENTUM CXIV.</head>
          <p>
            <s xml:id="echoid-s5640" xml:space="preserve">Filum ferrcum aut lamina oblonga & </s>
            <s xml:id="echoid-s5641" xml:space="preserve">plana a Magnete plurimum
              <lb/>
            virtutis acceperit, quâ ex ſuis extremitatibus pondus ferreum ele-
              <lb/>
            vet; </s>
            <s xml:id="echoid-s5642" xml:space="preserve">deinde in flectatur in formam annuli, atque ambo extrema ſe
              <lb/>
            contingant; </s>
            <s xml:id="echoid-s5643" xml:space="preserve">illico omnis fere vis Magnetica ex Ferro peribit. </s>
            <s xml:id="echoid-s5644" xml:space="preserve">neque
              <lb/>
            ad juncturæ locum poterit appendi Ferrum alicujus magnitudinis,
              <lb/>
            imo maxima quoque pars virtutis directricis erit deſtructa.</s>
            <s xml:id="echoid-s5645" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5646" xml:space="preserve">Obſervaverunt hoc multi Eruditi, Grimaldi in Lib. </s>
            <s xml:id="echoid-s5647" xml:space="preserve">de Lumine
              <lb/>
            & </s>
            <s xml:id="echoid-s5648" xml:space="preserve">Colore. </s>
            <s xml:id="echoid-s5649" xml:space="preserve">de la Hire in Philoſ. </s>
            <s xml:id="echoid-s5650" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s5651" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s5652" xml:space="preserve">188. </s>
            <s xml:id="echoid-s5653" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s5654" xml:space="preserve">349. </s>
            <s xml:id="echoid-s5655" xml:space="preserve">Derhamus
              <lb/>
            in Philoſ. </s>
            <s xml:id="echoid-s5656" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s5657" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s5658" xml:space="preserve">303. </s>
            <s xml:id="echoid-s5659" xml:space="preserve">Quorum hic attentiſſimus ad ejuſmodi
              <lb/>
            phænomena ſimul adnotavit, totam vim directricem perire, ſi ho-
              <lb/>
            ris diurnis filum in orbem inflexum fuerit, & </s>
            <s xml:id="echoid-s5660" xml:space="preserve">deinde iterum in lon-
              <lb/>
            gum exporrectum; </s>
            <s xml:id="echoid-s5661" xml:space="preserve">ſed virium partem modo evaneſcere, facto hoc
              <lb/>
            experimento tempore veſpertino: </s>
            <s xml:id="echoid-s5662" xml:space="preserve">eædem tamen extremitates fili
              <lb/>
            attrahuntur ab eodem Magnetis polo ante & </s>
            <s xml:id="echoid-s5663" xml:space="preserve">poſt fili flexionem.</s>
            <s xml:id="echoid-s5664" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5665" xml:space="preserve">Obſervandum eſt hoc Experimentum capienti, ne filum leviter
              <lb/>
            duntaxat inflectatur, ut ſibi relictum, ſponte priorem ſitum rectum
              <lb/>
            recuperet, ſed cum impetu flectatur, ut vis partibus inducatur, qua
              <lb/>
            filum inflexum poſtea maneat, hinc optime eventus Experimenti
              <lb/>
            ſpectatur, convoluto filo aliquoties circa cylindrum in formam ſpi-
              <lb/>
            ræ. </s>
            <s xml:id="echoid-s5666" xml:space="preserve">Fili ferrei altera extremitas polus Boreus, altera Auſtralis eva-
              <lb/>
            ſit, poſtquam ſuper Magnete ductum fuit: </s>
            <s xml:id="echoid-s5667" xml:space="preserve">filo flexo, ut </s>
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