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-div61" type="section" level="1" n="61">
          <p>
            <s xml:id="echoid-s2613" xml:space="preserve">
              <pb o="107" file="0121" n="121" rhead="DE MAGNETE."/>
            virtute actionem ſeriei primæ in Ferrum: </s>
            <s xml:id="echoid-s2614" xml:space="preserve">Quod ſi 9 partes a ſe ſe-
              <lb/>
            paratæ fuiſſent, atque ſingulis Ferrum immediate apponeretur, id
              <lb/>
            ſingulas contingens ſumma vi attractum fuiſſet, unde ſumma pon-
              <lb/>
            derum ab his 9 attractorum multum ſuperaret pondus ab unitâ maſ-
              <lb/>
            ſâ A geſtatum: </s>
            <s xml:id="echoid-s2615" xml:space="preserve">quo A in minores partes erit diviſum, quibus ſin-
              <lb/>
            gulis Ferrum geſtandum traditur, eo plus ponderis elevabitur ab omni-
              <lb/>
            bus ſimul: </s>
            <s xml:id="echoid-s2616" xml:space="preserve">quo autem A grandior moles exiſtit, eo partes poſterio-
              <lb/>
            res magis diſtant ab iis, quibus Ferrum applicatur, & </s>
            <s xml:id="echoid-s2617" xml:space="preserve">idcirco mi-
              <lb/>
            nus in id operari poſſunt.</s>
            <s xml:id="echoid-s2618" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div62" type="section" level="1" n="62">
          <head xml:id="echoid-head70" xml:space="preserve">EXPERIMENTUM. XLII.</head>
          <p>
            <s xml:id="echoid-s2619" xml:space="preserve">Quo Magnetes ſunt majores, licet non fuerint eximiæ virtutis,
              <lb/>
            eo ad majorem diſtantiam vires ſuas diffundunt: </s>
            <s xml:id="echoid-s2620" xml:space="preserve">Quare præſtantes,
              <lb/>
            ſed parvi Magnetes non tam late ſuam vim exſerunt, quam magni,
              <lb/>
            licet inertiores; </s>
            <s xml:id="echoid-s2621" xml:space="preserve">quod etiam experientia ſe didiciſſe confirmat Hart-
              <lb/>
            ſoekerus, ideo tres quatuorve Magnetes bene ſecum invicem jun-
              <lb/>
            cti ad majorem diſtantiam agunt, quam ſinguli ſeorſim.</s>
            <s xml:id="echoid-s2622" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2623" xml:space="preserve">Ad magnum ſæpe intervallum a lapide vis attractrix diffunditur;
              <lb/>
            </s>
            <s xml:id="echoid-s2624" xml:space="preserve">Experimenta nonnulla feci cum aliquo grandiori, qui manifeſto o-
              <lb/>
            perabatur in diſtantia 14 pedum Rhenolandicorum. </s>
            <s xml:id="echoid-s2625" xml:space="preserve">Optime cogno-
              <lb/>
            ſcetur ad quodnam intervallum vis ex Magnete extendatur duobus
              <lb/>
            ſequentibus modis. </s>
            <s xml:id="echoid-s2626" xml:space="preserve">1°. </s>
            <s xml:id="echoid-s2627" xml:space="preserve">Acus Chalybea tenuiſſima imponatur ſuperfi-
              <lb/>
            ciei Aquæ, ut natet in medio, tum in magna diſtantia poſitus Magnes
              <lb/>
            primum ſit, qui admoveatur ſenſim, & </s>
            <s xml:id="echoid-s2628" xml:space="preserve">ita ut linea tranſiens perpolos
              <lb/>
            Acum verſus dirigatur, appropinquet Magnes eousque, donec Acus
              <lb/>
            moveri incipiat, quæ tandem adnatabit parieti vaſis Magnetem ſpe-
              <lb/>
            ctanti. </s>
            <s xml:id="echoid-s2629" xml:space="preserve">2°. </s>
            <s xml:id="echoid-s2630" xml:space="preserve">Vel Verſorium mobiliſſimum, 6 pollices plureſvelon-
              <lb/>
            gum in Meridiano ſuo locetur, notato gradu cui cuſpis reſpondet,
              <lb/>
            tum Magnes ex longo intervallo ſenſim admoveatur, ita ut axis ſit
              <lb/>
            ad Acum perpendicularis in eodem horizontali plano, donec a ſitu
              <lb/>
            incipiat Verſorium detorqueri; </s>
            <s xml:id="echoid-s2631" xml:space="preserve">hæc diſtantia erit longitudo virium
              <lb/>
            Magneticarum, ſive radii activi; </s>
            <s xml:id="echoid-s2632" xml:space="preserve">hujus methodi mentionem quo-
              <lb/>
            que fecit Fontenellius in L’Hiſtoire de L’Acad. </s>
            <s xml:id="echoid-s2633" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s2634" xml:space="preserve">A°. </s>
            <s xml:id="echoid-s2635" xml:space="preserve">1717.</s>
            <s xml:id="echoid-s2636" xml:space="preserve"/>
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