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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              <pb o="236" file="0250" n="250" rhead="DISSERTATIO"/>
            ta, {1/12} pollic. </s>
            <s xml:id="echoid-s5571" xml:space="preserve">craſſa, ſuper polo Magnetis ducta, vim attractricem
              <lb/>
            accepit; </s>
            <s xml:id="echoid-s5572" xml:space="preserve">exploravi quantum ponderis ferrei lamina ab extremitate
              <lb/>
            alterutra geſtabat, ut virium Magnitudinem cognoſcerem, ponde-
              <lb/>
            re cognito, eidem extremitati appoſitæ & </s>
            <s xml:id="echoid-s5573" xml:space="preserve">affrictæ fuerunt 20 lamel-
              <lb/>
            læ, quæ nunquam antea Magnetem olfecerant, quæ erant æquales
              <lb/>
            & </s>
            <s xml:id="echoid-s5574" xml:space="preserve">ſimiles priori; </s>
            <s xml:id="echoid-s5575" xml:space="preserve">omnes hæ vim Magneticam ab affrictu receperunt:
              <lb/>
            </s>
            <s xml:id="echoid-s5576" xml:space="preserve">deinde iterum expertusfui, quantum ponderis lamina prior nunc ele-
              <lb/>
            varet, an vires attractrices decreviſſent, communicatæ cum 20 aliis
              <lb/>
            lamellis, an vero permanſiſſent; </s>
            <s xml:id="echoid-s5577" xml:space="preserve">idem omnino pondus geſtari cum
              <lb/>
            eadem facilitate deprehendi, ac ante; </s>
            <s xml:id="echoid-s5578" xml:space="preserve">unde concludendum erat,
              <lb/>
            vires quidem a Ferro communicari cum Ferro, ita tamen ut id, quod
              <lb/>
            liberalitatem ſuam hac communicatione oſtendit, nihil amittat. </s>
            <s xml:id="echoid-s5579" xml:space="preserve">
              <lb/>
            Unde vero aliorum error, vires imminui ſtatuentium? </s>
            <s xml:id="echoid-s5580" xml:space="preserve">Ecce fon-
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            tem: </s>
            <s xml:id="echoid-s5581" xml:space="preserve">Cum ſupra Ferrum plures laminæ traducuntur, ſordes abra-
              <lb/>
            duntur, quæ extremitati adhærent, huic igitur ſi pondus geſtandum
              <lb/>
            apponis, non id immediate metallo applicas, ſed corpuſculis inter-
              <lb/>
            poſitis, hinc aliquo intervallo pondus a Ferro ſejunctum tantis vi-
              <lb/>
            ribus attrahi nequit, quemadmodum Experimenta ſuperius in Ca-
              <lb/>
            pite primo & </s>
            <s xml:id="echoid-s5582" xml:space="preserve">ſecundo allata evicerunt: </s>
            <s xml:id="echoid-s5583" xml:space="preserve">hanc erroris eſſe veram
              <lb/>
            cauſam affirmo, mihi enim primum hoc tentanti viſa fuit eorum
              <lb/>
            Philoſophorum ſententia non repugnare veritati, quippe minus pon-
              <lb/>
            deris geſtabat lamina poſt, quam ante, aliarum affrictum, obſer-
              <lb/>
            vatis autem extremitati appenſis ſordibus, iiſque abſterſis, pondus
              <lb/>
            priſtinum a laminâ ferebatur.</s>
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          <head xml:id="echoid-head146" xml:space="preserve">EXPERIMENTUM CXI.</head>
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            <s xml:id="echoid-s5585" xml:space="preserve">Explorandum deinde duxi, quantum virium 20 lamellæ ſupra
              <lb/>
            primam, Lapidi antea applicatam, frictæ, acceperant; </s>
            <s xml:id="echoid-s5586" xml:space="preserve">in omni-
              <lb/>
            bus vim attrahentem proxime æquam vigere deprehendi, in ſingu-
              <lb/>
            lis tamen minorem, quam in prima lamina fuerat: </s>
            <s xml:id="echoid-s5587" xml:space="preserve">Uni ex viginti
              <lb/>
            affricui cultrum majorem, qui vi Magnetica imprægnabatur, mi-
              <lb/>
            nori tamen, quam in lamina erat, cui applicabatur: </s>
            <s xml:id="echoid-s5588" xml:space="preserve">huic cultro
              <lb/>
            alium affricui, eidemque iterum alium, huic ultimo tandem quar-
              <lb/>
            tum; </s>
            <s xml:id="echoid-s5589" xml:space="preserve">verum hic tam parum virtutis accepit, ut vix limaturæ par-
              <lb/>
            ticulam, vel pulviſculum Virginienſis arenæ attraheret, qualem </s>
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