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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              <pb o="56" file="0070" n="70" rhead="DISSERTATIO"/>
            hæc tentamina operoſiora viderentur, facilius demonſtrabitur Ma-
              <lb/>
            gnetem non tantundem ferri calefacti, quam frigidi attrahere, aut
              <lb/>
            ſibi applicatum ſuſtinere, ſi ipſi, aut inermi, aut armato, prius appen-
              <lb/>
            ſum fuerit ferrum frigidum tanti ponderis, quantum vix elevatur,
              <lb/>
            id enim poſtea calefactum & </s>
            <s xml:id="echoid-s1290" xml:space="preserve">denuo appoſitum non a Magnete feretur.</s>
            <s xml:id="echoid-s1291" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1292" xml:space="preserve">Nob. </s>
            <s xml:id="echoid-s1293" xml:space="preserve">Boyleus olim animadvertit Magnetem in alium Ignitum non
              <lb/>
            æquali vi operari quam in frigidum: </s>
            <s xml:id="echoid-s1294" xml:space="preserve">tres Magnetes compactæ ſub-
              <lb/>
            ſtantiæ igni immiſit, donec rubebant, calefactos argenteæ lamel-
              <lb/>
            læ impoſuit, inſra quam alter locatus Magnes attrahebat quidem
              <lb/>
            ignitos, ſed imbecillius, increſcente tamen continuo attractione,
              <lb/>
            prout magis refrigerabantur Magnetes.</s>
            <s xml:id="echoid-s1295" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1296" xml:space="preserve">Præterire igitur ſilentio errorem Kircheri nequeo, affirmantis in
              <lb/>
            Lib. </s>
            <s xml:id="echoid-s1297" xml:space="preserve">1. </s>
            <s xml:id="echoid-s1298" xml:space="preserve">§. </s>
            <s xml:id="echoid-s1299" xml:space="preserve">31. </s>
            <s xml:id="echoid-s1300" xml:space="preserve">pag. </s>
            <s xml:id="echoid-s1301" xml:space="preserve">140. </s>
            <s xml:id="echoid-s1302" xml:space="preserve">de Magnete, operationem Magnetis in fer-
              <lb/>
            rum frigidum & </s>
            <s xml:id="echoid-s1303" xml:space="preserve">ignitum eſſe penitus eandem: </s>
            <s xml:id="echoid-s1304" xml:space="preserve">in errorem incidiſſe
              <lb/>
            videtur vir Magnus, quod rudiori modo experimenta ceperit, fer-
              <lb/>
            rum ignitum applicando tantum Magneti armato, id enim quidem
              <lb/>
            attrahitur, ſed nunquam tantis viribus, quam ferrum frigidiſſi-
              <lb/>
            mum.</s>
            <s xml:id="echoid-s1305" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1306" xml:space="preserve">An hinc non intelligitur Magnetem minori vi ferrum, æſtivo
              <lb/>
            calore imprægnatum, attracturum, quam quando hyemali frigore
              <lb/>
            riget & </s>
            <s xml:id="echoid-s1307" xml:space="preserve">condenſatum eſt, quod memoravi in Experimento III.</s>
            <s xml:id="echoid-s1308" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s1309" xml:space="preserve">Demonſtrabitur in Capite V. </s>
            <s xml:id="echoid-s1310" xml:space="preserve">hujus Diſſertationis, Ferrum quod-
              <lb/>
            cunque vi Magnetica imprægnari quando refrigeratur; </s>
            <s xml:id="echoid-s1311" xml:space="preserve">& </s>
            <s xml:id="echoid-s1312" xml:space="preserve">in Cap.
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            </s>
            <s xml:id="echoid-s1313" xml:space="preserve">III. </s>
            <s xml:id="echoid-s1314" xml:space="preserve">Ignem eandem vim, aut majorem cum Ferro a Magnete com-
              <lb/>
            municatam expellere; </s>
            <s xml:id="echoid-s1315" xml:space="preserve">ideo Ferrum candidiſſimum, magnâ parte vir-
              <lb/>
            tutis attrahentis ſpoliatum, nequit â Magnete tanto cum impetu
              <lb/>
            attrahi, quam frigidum, vi donatum Magneticâ: </s>
            <s xml:id="echoid-s1316" xml:space="preserve">præterea motus
              <lb/>
            vibratorius, quo igniti ferri partes contremiſcunt, vires Magneti-
              <lb/>
            cas impediunt, irritasque reddunt: </s>
            <s xml:id="echoid-s1317" xml:space="preserve">ulterius hic quidem quæri poſ-
              <lb/>
            ſet, quomodo Ignis in has vires operetur, verum quia nondum ex-
              <lb/>
            plicui, quomodo hæ comparatæ ſint, an corporeæ, an alterius
              <lb/>
            indolis? </s>
            <s xml:id="echoid-s1318" xml:space="preserve">præſtabit hic nihil amplius addidiſſe, ſed in iis indagandis
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            aliquem impendiſſe laborem.</s>
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