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-s3053" xml:space="preserve">Sed hæc maſſa ſive integra, ſive in pulverem tuſa, vehementer
              <lb/>
            & </s>
            <s xml:id="echoid-s3054" xml:space="preserve">a Magnete & </s>
            <s xml:id="echoid-s3055" xml:space="preserve">ab Acu Nautica attrahitur, & </s>
            <s xml:id="echoid-s3056" xml:space="preserve">ad longe majorem
              <lb/>
            diſtantiam quam Limatura Ferri recens: </s>
            <s xml:id="echoid-s3057" xml:space="preserve">quod manifeſto probat ne-
              <lb/>
            que Sulphur, neque Salem Ferri eſſe materiam attractioni propriam,
              <lb/>
            ſed aliquam aliam, quæ eo fortius attrahitur, quo accuratius orbata
              <lb/>
            eſt Sulphure & </s>
            <s xml:id="echoid-s3058" xml:space="preserve">Sale.</s>
            <s xml:id="echoid-s3059" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3060" xml:space="preserve">Hæc materia cohærebat hactenus cum terra ſolida, quam in vi-
              <lb/>
            trum abire ſuperius monui, & </s>
            <s xml:id="echoid-s3061" xml:space="preserve">quæ nullam vim in ſe habet: </s>
            <s xml:id="echoid-s3062" xml:space="preserve">igitur
              <lb/>
            ſeparanda erat ab hac terrâ inerti, quantum poterat; </s>
            <s xml:id="echoid-s3063" xml:space="preserve">in eo ſecutus
              <lb/>
            fui Cl. </s>
            <s xml:id="echoid-s3064" xml:space="preserve">Lemmerium, qui ad pulverem redactæ materiæ affudit Spi-
              <lb/>
            ritum Nitri; </s>
            <s xml:id="echoid-s3065" xml:space="preserve">abſque efferveſcentia ſenſibili ſolvebatur pulvis, atque
              <lb/>
            ad ſuperficiem abibat in pulverem album, pinguiuſculum, qui ſæ-
              <lb/>
            pe aliquamdiu candorem retinet, aliquando fulvus fit; </s>
            <s xml:id="echoid-s3066" xml:space="preserve">hic pulvis
              <lb/>
            collectus ſeorſim, & </s>
            <s xml:id="echoid-s3067" xml:space="preserve">prope exſiccatus attrahitur vi majori adhuc a
              <lb/>
            Magnete vel a lamina Chalybea, quam maſſa præcedens attracta
              <lb/>
            fuit: </s>
            <s xml:id="echoid-s3068" xml:space="preserve">videtur hoc corpus id ſolum eſſe, quod in Ferro cauſa attractio-
              <lb/>
            nis exiſtit, quodque miſtum cum aliis corporum generibus, ut Fer-
              <lb/>
            rum conſtituat, agere impeditur aliquomodo.</s>
            <s xml:id="echoid-s3069" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3070" xml:space="preserve">Forſitan ſimile aut idem corpus in Magnete eſt ſolum id, quod at-
              <lb/>
            tractionem in eo excitat, quod quo purius eſt & </s>
            <s xml:id="echoid-s3071" xml:space="preserve">in majori quantita-
              <lb/>
            te, eo Magnetem præſtantiorum virium facit: </s>
            <s xml:id="echoid-s3072" xml:space="preserve">Id autem quadante-
              <lb/>
            nus colligi poteſt ex Magnetibus, qui tempore generantur in aëre ex
              <lb/>
            Ferro: </s>
            <s xml:id="echoid-s3073" xml:space="preserve">quod cum ab aëre in rubiginem corroditur, ſuos Sales miſcet
              <lb/>
            cum materia terreſtri, Sulphur miſcetur cum Salibus per aërem na-
              <lb/>
            tantibus, & </s>
            <s xml:id="echoid-s3074" xml:space="preserve">idcirco ex Ferro ſeparantur ex ſe ejus principia com-
              <lb/>
            ponentia: </s>
            <s xml:id="echoid-s3075" xml:space="preserve">ſcilicet terra, materia Magnetica, Sal, Sulphur; </s>
            <s xml:id="echoid-s3076" xml:space="preserve">cum igi-
              <lb/>
            tur materia Magnetica ſimul cum pluvia ingreditur poros lapidis,
              <lb/>
            cui Ferrum inhæret, eos in veros Magnetes mutat, quos, expe-
              <lb/>
            rientia teſte, deprehendimus perpetuo ubicunque modo Ferrum aëri
              <lb/>
            diu expoſitum lapidique infixum ſpongioſo fuerit.</s>
            <s xml:id="echoid-s3077" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3078" xml:space="preserve">Ex hac Analyſi liquet manifeſto, cur Chalybs melius imbuatur
              <lb/>
            vi Magnetica, eandemque retineat, quam Ferrum: </s>
            <s xml:id="echoid-s3079" xml:space="preserve">Chalybs enim
              <lb/>
            antequam uſibus convenit, aliquoties eſt igniendus & </s>
            <s xml:id="echoid-s3080" xml:space="preserve">cudendus, in
              <lb/>
            Igne certo certius deponens aliquantum ſui Sulphuris vel Olei, unde
              <lb/>
            nunquam tam flexilis eſt poſtea, quam Ferrum, tum igitur Chalybs
              <lb/>
            depuratur magis ab heterogenea materia adhærente, & </s>
            <s xml:id="echoid-s3081" xml:space="preserve">pro </s>
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