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-div141" type="section" level="1" n="141">
          <pb o="241" file="0255" n="255" rhead="DE MAGNETE."/>
        </div>
        <div xml:id="echoid-div142" type="section" level="1" n="142">
          <head xml:id="echoid-head151" xml:space="preserve">EXPERIMENTUM CXVI.</head>
          <p>
            <s xml:id="echoid-s5685" xml:space="preserve">Sed oportebit demonſtrare, quomodo Ferrum vi Magneticâ im-
              <lb/>
            prægnatum agat in Scobem Ferri, aut in pulverem Indicum circa
              <lb/>
            ipſum conſperſum; </s>
            <s xml:id="echoid-s5686" xml:space="preserve">a ſimpliciſſimo Experimento initium capiamus:
              <lb/>
            </s>
            <s xml:id="echoid-s5687" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s5688" xml:space="preserve">3. </s>
            <s xml:id="echoid-s5689" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s5690" xml:space="preserve">3. </s>
            <s xml:id="echoid-s5691" xml:space="preserve">Lamina Chalybea A C D B, 12 longa pollices; </s>
            <s xml:id="echoid-s5692" xml:space="preserve">de-
              <lb/>
            ſcripta in Experimento CXXII, ſuper Magnete ducta, impoſita fuit
              <lb/>
            plano vitreo ſpeculo; </s>
            <s xml:id="echoid-s5693" xml:space="preserve">erat lamina formæ parallelopipedæ, circum-
              <lb/>
            quaque ſparſa fuit Scobs ferrea vel arena Indica, rara, ut melius
              <lb/>
            ſeries obſervarentur, tum ſpeculo leviter concuſſo, in ſeries ordi-
              <lb/>
            natus fuit circumjectus pulvis, quales figura repræſentat; </s>
            <s xml:id="echoid-s5694" xml:space="preserve">diſtabant
              <lb/>
            omnes â ſe inæquali intervallo; </s>
            <s xml:id="echoid-s5695" xml:space="preserve">quæ è regione A & </s>
            <s xml:id="echoid-s5696" xml:space="preserve">B extremita-
              <lb/>
            tum erant, in eadem recta cum longitudine laminæ jacebant, qua-
              <lb/>
            les demonſtrant AE, BF: </s>
            <s xml:id="echoid-s5697" xml:space="preserve">ſeries ambientes utramque extremitatem
              <lb/>
            laminæ A & </s>
            <s xml:id="echoid-s5698" xml:space="preserve">B, ad diſtantiam ſesqui pollicis, hoc eſt ad C & </s>
            <s xml:id="echoid-s5699" xml:space="preserve">D,
              <lb/>
            etiam in rectis lineis extendebantur, quamvis extrema ambierint,
              <lb/>
            veluti oſtendunt GG, HH. </s>
            <s xml:id="echoid-s5700" xml:space="preserve">Media autem laminæ pars C D cinge-
              <lb/>
            batur a Scobe utrimque in curvilineas ſeries ordinata, quæ non vi-
              <lb/>
            dentur eſſe circulorum arcus, ſed aliarum curvarum portiones.</s>
            <s xml:id="echoid-s5701" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5702" xml:space="preserve">Angulis laminæ excuſſis ita, ut utraque extremitas capite ro-
              <lb/>
            tundo terminaretur, circumſperſa arena Virginienſis in ſeries priori
              <lb/>
            ſimiles ordinabatur, quas repræſentat Tab. </s>
            <s xml:id="echoid-s5703" xml:space="preserve">4. </s>
            <s xml:id="echoid-s5704" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s5705" xml:space="preserve">1. </s>
            <s xml:id="echoid-s5706" xml:space="preserve">Extremitati-
              <lb/>
            bus autem deſinentibus in Cuſpides acutas, paulum diverſo diſpo-
              <lb/>
            nebantur ſeries modo, quas in fig. </s>
            <s xml:id="echoid-s5707" xml:space="preserve">2. </s>
            <s xml:id="echoid-s5708" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s5709" xml:space="preserve">4. </s>
            <s xml:id="echoid-s5710" xml:space="preserve">conſpicimus. </s>
            <s xml:id="echoid-s5711" xml:space="preserve">Ex-
              <lb/>
            tremitatibus vero bifidis factis, uti in fig. </s>
            <s xml:id="echoid-s5712" xml:space="preserve">3. </s>
            <s xml:id="echoid-s5713" xml:space="preserve">ordinatæ iterum
              <lb/>
            aliter fuerunt ſeries; </s>
            <s xml:id="echoid-s5714" xml:space="preserve">quæ ex quolibet angulo, veluti ex centro
              <lb/>
            circuli exporrigebantur rectæ, hinc verſus ſe inclinantes in hiulco
              <lb/>
            inter utramque cuſpidem ejuſdem lateris, non tamen ſeſe invi-
              <lb/>
            cem attingebant; </s>
            <s xml:id="echoid-s5715" xml:space="preserve">medium laminæ, uti ante, a rotundis ambie-
              <lb/>
            batur ſeriebus.</s>
            <s xml:id="echoid-s5716" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5717" xml:space="preserve">Poſitâ ante oculos figura 3. </s>
            <s xml:id="echoid-s5718" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s5719" xml:space="preserve">3, laminam quadrangularem
              <lb/>
            exhibente, exploratum fuit quomodo hæc lamina pulverem, cui
              <lb/>
            immittebatur, attraheret: </s>
            <s xml:id="echoid-s5720" xml:space="preserve">lateri o, p, tenuiſſimo maxima quan-
              <lb/>
            titas adhæſit, & </s>
            <s xml:id="echoid-s5721" xml:space="preserve">quidem imprimis adhæſit angulis o, p, atque
              <lb/>
            longiſſimo termino interjacenti angulis o, p, planæ ſuperſiciei ali-
              <lb/>
            quid, ſed parum.</s>
            <s xml:id="echoid-s5722" xml:space="preserve"/>
          </p>
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