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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            <s xml:id="echoid-s6379" xml:space="preserve">
              <pb o="266" file="0280" n="280" rhead="DISSERTATIO"/>
            Ferri attrahet, haud aliter ac ſi lamella vi debilis Magnetis impræ-
              <lb/>
            gnata fuiſſet.</s>
            <s xml:id="echoid-s6380" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6381" xml:space="preserve">Cl Reaumurius hoc Experimentum inſtituit cum ferramentis gran-
              <lb/>
            dibus, tum cum filis optimi ut & </s>
            <s xml:id="echoid-s6382" xml:space="preserve">mollis fragilisque Ferri; </s>
            <s xml:id="echoid-s6383" xml:space="preserve">cum
              <lb/>
            Chalybe temperato & </s>
            <s xml:id="echoid-s6384" xml:space="preserve">non temperato: </s>
            <s xml:id="echoid-s6385" xml:space="preserve">poſitis cæteris æqualibus,
              <lb/>
            quo Ferrum diffractum eſt mollius, eo eſt magis fibroſum, & </s>
            <s xml:id="echoid-s6386" xml:space="preserve">non
              <lb/>
            niſi pluribus flexionibus frangitur, ſed eo majorem vim attractri-
              <lb/>
            cem acquirit. </s>
            <s xml:id="echoid-s6387" xml:space="preserve">Ferrum fragile, citius ruptum, minori vi imprægna-
              <lb/>
            tur, minori adhucdum Chalybs temperatus; </s>
            <s xml:id="echoid-s6388" xml:space="preserve">qui prout mollior ri-
              <lb/>
            gidiorve fuerit, ita fortius vel imbecillius attrahit. </s>
            <s xml:id="echoid-s6389" xml:space="preserve">In genere, omne
              <lb/>
            Ferrum flexione fractum vim Magneticam habet, ſed interdum
              <lb/>
            modo diei ſpatio perdurantem: </s>
            <s xml:id="echoid-s6390" xml:space="preserve">Memorat inſuper Autor, non eſſe
              <lb/>
            ſenſibilem vim attractricem, ſi Ferrum tantummodo craſſitiem A-
              <lb/>
            cûs habuerit; </s>
            <s xml:id="echoid-s6391" xml:space="preserve">neque eam augeri in ratione craſſitiei laminarum,
              <lb/>
            ſed eſſe maximam in Ferro craſſitie digitum minimum æquante: </s>
            <s xml:id="echoid-s6392" xml:space="preserve">In
              <lb/>
            hiſce Experimentis iterum determinata longitudo Ferri requiritur;
              <lb/>
            </s>
            <s xml:id="echoid-s6393" xml:space="preserve">flecte enim & </s>
            <s xml:id="echoid-s6394" xml:space="preserve">rumpe in medio Ferrum, cujus longitudo unius pedis,
              <lb/>
            ambo fragmenta vim manifeſtam oſtendent: </s>
            <s xml:id="echoid-s6395" xml:space="preserve">aſt ita crebro in flexum dif-
              <lb/>
            fringe, ut alterutrum fragmentum non ſuperet ſua longitudine di-
              <lb/>
            gitum, hoc limaturam, utcunque ſubtilem, attrahet nequaquam,
              <lb/>
            altero interim longiſſimo fragmento vi validâ eam alliciente.</s>
            <s xml:id="echoid-s6396" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6397" xml:space="preserve">In hiſce Experimentis fractura duntaxat vim Magneticam acqui-
              <lb/>
            rit, alia extrema permanent comparata eodem modo ac ante in-
              <lb/>
            ſtitutum Experimentum.</s>
            <s xml:id="echoid-s6398" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div167" type="section" level="1" n="167">
          <head xml:id="echoid-head177" xml:space="preserve">EXPERIMENTUM CXL.</head>
          <p>
            <s xml:id="echoid-s6399" xml:space="preserve">Sed plura elegantia tentamina cum Ferro debentur ſubtili Reau-
              <lb/>
            murio, inter quæ hoc etiam: </s>
            <s xml:id="echoid-s6400" xml:space="preserve">Filum ferreum craſſitiei circiter digiti
              <lb/>
            minimi, longitudinis 2 {1/2} pedum in forcipe tenuit, atque 5 digitis ab
              <lb/>
            extremo crebris flexionibus diffregit, utraque ſuperficies fracturæ
              <lb/>
            tantum virtutis Magneticæ habuit, qua clavum elevaret exi-
              <lb/>
            guum.</s>
            <s xml:id="echoid-s6401" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6402" xml:space="preserve">Deinde longiſſimum fragmentum, eidem forcipi inſertum, ad di-
              <lb/>
            ſtantiam 1 {1/2} pollicis a fractura aliquoties inflexit, id tamen non fran-
              <lb/>
            gens; </s>
            <s xml:id="echoid-s6403" xml:space="preserve">hinc prioris fracturæ ſuperficies majorem vim attrahendi </s>
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