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-div137" type="section" level="1" n="137">
          <p>
            <s xml:id="echoid-s5589" xml:space="preserve">
              <pb o="237" file="0251" n="251" rhead="DE MAGNETE."/>
            tea attraxiſſet: </s>
            <s xml:id="echoid-s5590" xml:space="preserve">Si plures laminas Chalybeas inter ſe æquales habuiſ-
              <lb/>
            ſem animus erat, has ſibi affricare ſucceſſive, & </s>
            <s xml:id="echoid-s5591" xml:space="preserve">proportionem de-
              <lb/>
            crementi virium annotare, ſed iis deſtitutus, Experimentum dun-
              <lb/>
            taxat cum cultris cepi.</s>
            <s xml:id="echoid-s5592" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5593" xml:space="preserve">Communicat igitur Ferrum vim ſuam cum Ferro, ſed minus tra-
              <lb/>
            dit, quam habet, quamobrem decreſcit communicata visperpetuo,
              <lb/>
            quo plura corpora ferrea ſibi invicem applicata ſucceſſive ſuerint,
              <lb/>
            Eſt igitur hæc proprietas virtutis Magneticæ, utmaneat eadem quan-
              <lb/>
            titate in Ferro, etiamſi id a plurimis ferramentis tangatur: </s>
            <s xml:id="echoid-s5594" xml:space="preserve">2° ut
              <lb/>
            generet aut excitet in æquali ferramento minus virtutis quam ipſa
              <lb/>
            eſt: </s>
            <s xml:id="echoid-s5595" xml:space="preserve">non enim tranſire ex Ferro in Ferrum poteſt, quia eadem ma-
              <lb/>
            net in Ferro, quod antea obſedit.</s>
            <s xml:id="echoid-s5596" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div138" type="section" level="1" n="138">
          <head xml:id="echoid-head147" xml:space="preserve">EXPERIMENTUM CXII.</head>
          <p>
            <s xml:id="echoid-s5597" xml:space="preserve">Quia lamellæ ferreæ & </s>
            <s xml:id="echoid-s5598" xml:space="preserve">Chalybeæ Magneti affrictæ mutantur in
              <lb/>
            veros Magnetes, conati fuerunt Philoſophi ex pluribus ſibi impoſi-
              <lb/>
            tis laminis Magnetem artificialem componere, qui Ferrum attrahat,
              <lb/>
            elevet, geſtet, vim cum alio Ferro communicet inſtar veri Magne-
              <lb/>
            tis: </s>
            <s xml:id="echoid-s5599" xml:space="preserve">non injucundum, nec prorſus inutile erit fabricam ejuſmodi
              <lb/>
            Magnetis commemoraſſe: </s>
            <s xml:id="echoid-s5600" xml:space="preserve">Eligantur aliquotlaminæ Chalybeæ, tem-
              <lb/>
            peratæ, ſive induratæ ad eandem cum gladiis elaſticitatem; </s>
            <s xml:id="echoid-s5601" xml:space="preserve">per to-
              <lb/>
            tam ſuam longitudinem, ſint æque latæ, æque craſſæ & </s>
            <s xml:id="echoid-s5602" xml:space="preserve">politiſſi-
              <lb/>
            mæ, convenientiſſima menſura eſt ut ſint ad minimum 12 pollices
              <lb/>
            longæ, longiores tamen ſunt præſtantiores, {3/4} pollic. </s>
            <s xml:id="echoid-s5603" xml:space="preserve">latæ, {1/12} pol-
              <lb/>
            licis craſſæ: </s>
            <s xml:id="echoid-s5604" xml:space="preserve">Hæ bene imprægnatæ viribus liberalis & </s>
            <s xml:id="echoid-s5605" xml:space="preserve">egregii Ma-
              <lb/>
            gnetis ſibi mutuo imponantur, eo ordine, ut poli cognomines
              <lb/>
            ſe contingant, omnesque accurate congruentes, unitum quaſi cor-
              <lb/>
            pus, parallelopipedum, forment, quod repræſentatur Tab. </s>
            <s xml:id="echoid-s5606" xml:space="preserve">3. </s>
            <s xml:id="echoid-s5607" xml:space="preserve">fig.
              <lb/>
            </s>
            <s xml:id="echoid-s5608" xml:space="preserve">2. </s>
            <s xml:id="echoid-s5609" xml:space="preserve">huic armatura applicanda eſt, qualis Magneti apponitur, quæ
              <lb/>
            vinculo æeo CC cochlea cuprea inſtructo adigatur, ut arctiſſime
              <lb/>
            extremitates laminarum cum pedibus armaturæ conjungantur, ſunt
              <lb/>
            quoque laminæ ſibi fortiter apprimendæ. </s>
            <s xml:id="echoid-s5610" xml:space="preserve">ut unum corpus conſti-
              <lb/>
            tuant, idcirco ſuperius jugum cupreum BB imponitur, quod ope 4
              <lb/>
            ænearum cochlearum AAAA valde depreſſum, laminas coagmen-
              <lb/>
            tat in firmam unitamque maſſam.</s>
            <s xml:id="echoid-s5611" xml:space="preserve"/>
          </p>
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