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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          <p>
            <s xml:id="echoid-s3265" xml:space="preserve">
              <pb o="133" file="0147" n="147" rhead="DE MAGNETE"/>
            num conſulamus annotantem ſe vidiſſe Magnetem ponderis Librar 3,
              <lb/>
            qui inermis elevabat tantum Unciam ſemiſſem, armatus autem ge-
              <lb/>
            ſtabat Libras 10.</s>
            <s xml:id="echoid-s3266" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3267" xml:space="preserve">De Lanis in Magiſt. </s>
            <s xml:id="echoid-s3268" xml:space="preserve">Nat. </s>
            <s xml:id="echoid-s3269" xml:space="preserve">& </s>
            <s xml:id="echoid-s3270" xml:space="preserve">Artis Tom. </s>
            <s xml:id="echoid-s3271" xml:space="preserve">3. </s>
            <s xml:id="echoid-s3272" xml:space="preserve">Lib. </s>
            <s xml:id="echoid-s3273" xml:space="preserve">23. </s>
            <s xml:id="echoid-s3274" xml:space="preserve">Cap. </s>
            <s xml:id="echoid-s3275" xml:space="preserve">1. </s>
            <s xml:id="echoid-s3276" xml:space="preserve">§.
              <lb/>
            </s>
            <s xml:id="echoid-s3277" xml:space="preserve">15. </s>
            <s xml:id="echoid-s3278" xml:space="preserve">Magnetem ſe habuiſſe, inquit, qui armatus elevabat grana 864,
              <lb/>
            ſed idem inermis ſuſtinuit modo grana 54. </s>
            <s xml:id="echoid-s3279" xml:space="preserve">Memoratque Romæ Ma-
              <lb/>
            gnetem fuiſſe, qui inermis vix drachmam, armatus vero Uncias 5
              <lb/>
            elevabat Ex quibus obſervatis liquido conſtat, exarmatura plus pon-
              <lb/>
            deris geri, quam ex nudo Magnete, quia autem non credibile eſt,
              <lb/>
            Magnetes memoratos fuiſſe eodem modo, & </s>
            <s xml:id="echoid-s3280" xml:space="preserve">cum ſumma cautelà
              <lb/>
            armatos, dici nequit vires proportione eadem, aut diverſa ad ele-
              <lb/>
            vandum Ferrum acquiri.</s>
            <s xml:id="echoid-s3281" xml:space="preserve"/>
          </p>
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        <div xml:id="echoid-div96" type="section" level="1" n="96">
          <head xml:id="echoid-head104" xml:space="preserve">EXPERIMENTUM. LXXV.</head>
          <p>
            <s xml:id="echoid-s3282" xml:space="preserve">Si Magnes ex uno ſui polo poteſt ſuſpenſos tenere aliquot annu-
              <lb/>
            los ferreos, ſibi libere appenſos, unus vero ex iis ita ſuſpendatur, ut
              <lb/>
            ambos Magnetis polos ſimul tangat, tum hic unus tantum ſuſtineri
              <lb/>
            poteſt a Magnete, omneſque alii, qui huic applicantur, deci-
              <lb/>
            dunt.</s>
            <s xml:id="echoid-s3283" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3284" xml:space="preserve">Primo intuitu crederemus vim unitam fortiorem fore, cum enim
              <lb/>
            unus polus plures elevat annulos, duo poli plures elevarent, impri-
              <lb/>
            miscum multo plus Ferri ex ambobus polis ſimul ſuſpendi poteſt, quam
              <lb/>
            ex uno; </s>
            <s xml:id="echoid-s3285" xml:space="preserve">ſed contrarium obtinet: </s>
            <s xml:id="echoid-s3286" xml:space="preserve">Infirmitatis igitur ratio pendebit ex
              <lb/>
            figura annulari ipſius Ferri, efficiente, ut vis exiens ex Magnetis
              <lb/>
            uno polo, deſtruat eam ex altero, poſtquam contrariâ directione ſibii
              <lb/>
            occurrerint, unde nihil amplius ex primo annulo geſtari poterit.</s>
            <s xml:id="echoid-s3287" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div97" type="section" level="1" n="97">
          <head xml:id="echoid-head105" xml:space="preserve">EXPERIMENTUM LXXVI.</head>
          <p>
            <s xml:id="echoid-s3288" xml:space="preserve">Si pedi Magnetis armati affricetur lamella ferrea, imbuitur ma-
              <lb/>
            jori vi attractrice, quam ſi eadem lamella eidem polo Magnetis in-
              <lb/>
            ermis affricta fuiſſet.</s>
            <s xml:id="echoid-s3289" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3290" xml:space="preserve">Hoc in controverſum vocatum fuit a nonnullis, qui eandem vim
              <lb/>
            communicari ab inermi, quam ab armato Magnete ſtatuerunt, cum
              <lb/>
            hiſce tamen conſentire nequeo, refragante experientia: </s>
            <s xml:id="echoid-s3291" xml:space="preserve">& </s>
            <s xml:id="echoid-s3292" xml:space="preserve"/>
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