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-div89" type="section" level="1" n="89">
          <pb o="123" file="0137" n="137" rhead="DE MAGNETE."/>
        </div>
        <div xml:id="echoid-div90" type="section" level="1" n="90">
          <head xml:id="echoid-head98" xml:space="preserve">EXPERIMENTUM LXX.</head>
          <p>
            <s xml:id="echoid-s2977" xml:space="preserve">Ambo iidem Magnetes juxta ſe, nihilo interpuncto, ponantur; </s>
            <s xml:id="echoid-s2978" xml:space="preserve">ſedut
              <lb/>
            poli alterni nominis ſurſum ſpectent, ſupra aſſerculum, illis impoſitum,
              <lb/>
            ſpargatur Scobs ferrea, hæc uti in Tab. </s>
            <s xml:id="echoid-s2979" xml:space="preserve">5. </s>
            <s xml:id="echoid-s2980" xml:space="preserve">fig. </s>
            <s xml:id="echoid-s2981" xml:space="preserve">1. </s>
            <s xml:id="echoid-s2982" xml:space="preserve">ambos polos mon-
              <lb/>
            ſtrabit ad A, a. </s>
            <s xml:id="echoid-s2983" xml:space="preserve">inter quos loco intermedio Scobs in curvilineam,
              <lb/>
            ab utraque parte convexam, figuram diſponetur, cæteroquin qua-
              <lb/>
            quaverſum vis rectà exiens Scobem quoque rectà conformat: </s>
            <s xml:id="echoid-s2984" xml:space="preserve">in-
              <lb/>
            termedia inter polos A, a, Scobis figura eſt eadem, ac ſi ambo Ma-
              <lb/>
            gnetes in eodem jacentes horizontali plano polis alterni nominis ſc
              <lb/>
            ſpectaſſent, non Scobis fit fuga, ſed amica attractio, a viribus
              <lb/>
            conſpirantium polorum excitata.</s>
            <s xml:id="echoid-s2985" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div91" type="section" level="1" n="91">
          <head xml:id="echoid-head99" xml:space="preserve">EXPERIMENTUM LXXI.</head>
          <p>
            <s xml:id="echoid-s2986" xml:space="preserve">Si Limatura Ferri infundatur tubis vitreis, atque arcte compin-
              <lb/>
            gatur, fit æque apta recipiendo vim Magnetis, quam Ferri fruſtum
              <lb/>
            unitum, ut docet ejus affrictio ad Magnetem, & </s>
            <s xml:id="echoid-s2987" xml:space="preserve">vis deinde explo-
              <lb/>
            rata, nam ab hoc non differt, niſi quod partes in maſſa ſunt ar-
              <lb/>
            ctius unitæ inter ſe, quam in Limatura attamen in Limatura com-
              <lb/>
            pactâ ſe bene contingunt: </s>
            <s xml:id="echoid-s2988" xml:space="preserve">ſi vero hæc Limatura commoveatur,
              <lb/>
            quaſſeturque, ut partes locum ſuum mutent, illico omnis earum vis
              <lb/>
            perit: </s>
            <s xml:id="echoid-s2989" xml:space="preserve">nam fricantur partes inter ſe diverſiſſimis directionibus; </s>
            <s xml:id="echoid-s2990" xml:space="preserve">quem-
              <lb/>
            admodum autem virtus ex Ferro auferebatur, cum contraria directio-
              <lb/>
            ne eidem polo Magnetis affricabatur quam ante, ita per ſimiles con-
              <lb/>
            trarias frictiones vis ex Limatura perit.</s>
            <s xml:id="echoid-s2991" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div92" type="section" level="1" n="92">
          <head xml:id="echoid-head100" xml:space="preserve">EXPERIMENTUM LXXII.</head>
          <p>
            <s xml:id="echoid-s2992" xml:space="preserve">Conſtitit quidem huc uſque Magnetem attrahere Ferrum; </s>
            <s xml:id="echoid-s2993" xml:space="preserve">quia
              <lb/>
            autem Ferrum eſt maſſa admodum compoſita, ex Sulphure, Sale,
              <lb/>
            Terra, examinandum erat, quid inſit Ferro, quod attrahitur: </s>
            <s xml:id="echoid-s2994" xml:space="preserve">an
              <lb/>
            Sulphur, an Sal, an Terra, an autem hæc omnia ſimul poſtulen-
              <lb/>
            tur permixta?</s>
            <s xml:id="echoid-s2995" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2996" xml:space="preserve">Si Ferrum in Carbonibus foſſilibus vehementiſſime igniatur, </s>
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