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-div115" type="section" level="1" n="115">
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            <s xml:id="echoid-s3635" xml:space="preserve">
              <pb o="147" file="0161" n="161" rhead="DE MAGNETE."/>
            detur Doctiſſimus Hambergerus ſimile aliquid obſervaſſe inProgram-
              <lb/>
            mate Inaugurali de Partialitate Acus Magneticæ, cujus obſerva-
              <lb/>
            tiones, etiamſi non accurate cum noſtris conveniant, non dubito
              <lb/>
            quin veræ ſint, & </s>
            <s xml:id="echoid-s3636" xml:space="preserve">bene adnotatæ, nam dabitur in his Experimen-
              <lb/>
            tis ſemper diſcrepantia, pro varia tempeſtate diei, anni, longitudine
              <lb/>
            & </s>
            <s xml:id="echoid-s3637" xml:space="preserve">ſtructura Ferri, tum pro vario Magnete, qui in uſum vocatur:
              <lb/>
            </s>
            <s xml:id="echoid-s3638" xml:space="preserve">Acum, inquit, in ſuperficie ſuperiori polo Magnetis Boreali ſtrinxi
              <lb/>
            ab extremitate verſus centrum, hæc impoſita ſtilo, nec ſeſe ſponte
              <lb/>
            verſus Septentrionem dirigebat, ſed in quovis fere ſitu quie ſcebat,
              <lb/>
            aliqualem tamen conatum ſeſe dirigendi verſus Septentrionem obſer-
              <lb/>
            vabam: </s>
            <s xml:id="echoid-s3639" xml:space="preserve">Nobis autem ſemper contigit obſervare Acum accurate dirigi
              <lb/>
            in Meridiano Magnetico, etiamſi non tetigerit Magnetem, verum
              <lb/>
            centrum O AcûsTab.</s>
            <s xml:id="echoid-s3640" xml:space="preserve">4.</s>
            <s xml:id="echoid-s3641" xml:space="preserve">fig.</s>
            <s xml:id="echoid-s3642" xml:space="preserve">9 probe deterſum fuit a ſquammis, quæ igni-
              <lb/>
            tione oriuntur, & </s>
            <s xml:id="echoid-s3643" xml:space="preserve">mobilitatem ſua aſperitate tollunt: </s>
            <s xml:id="echoid-s3644" xml:space="preserve">pergit deinde, Ad-
              <lb/>
            moto polo Magnetis Boreali ad Acus cuſpidem, hæc recedebat a Ma-
              <lb/>
            gnete, cauda Acus haud accedebat, ſedtota Acus poſt aliquot vibrationes
              <lb/>
            reciprocas ita ſubſiſtebat, ut ad lineam per polos Magnetis ad
              <lb/>
            centrum Acus ductam eſſet perpendicularis, admoto vero polo Ma-
              <lb/>
            gnetis Auſtrali ad caudam, hæc ad polum accedebat, ejuſque mo-
              <lb/>
            tum ſequebatur, eodem polo ad cuſpidem accedente, etiam hæc ac-
              <lb/>
            cedebat ad polum Magnetis, eumque commotum ſequebatur, minori
              <lb/>
            tamen celeritate quam cauda. </s>
            <s xml:id="echoid-s3645" xml:space="preserve">Polus ergo Magnetis Auſtralis utrique
              <lb/>
            extremo amicus, ipſa vero acus reſpectu totius Magnetis partialis
              <lb/>
            erat. </s>
            <s xml:id="echoid-s3646" xml:space="preserve">In noſtro Experimento utraque Verſorii extremitas erat amica
              <lb/>
            polo Boreo alterius Verſorii, quod directe eſt oppoſitum obſervationi
              <lb/>
            Hambergeri; </s>
            <s xml:id="echoid-s3647" xml:space="preserve">elapſo menſerepetii Experimentum, eventu conveniente
              <lb/>
            cum obſervationibusHambergerianis, nam Verſorii utraque extremitas
              <lb/>
            erat amica polo Auſtrali alterius; </s>
            <s xml:id="echoid-s3648" xml:space="preserve">adeo Natura in Magneticis luxuriat,
              <lb/>
            ut oppoſitos nonnunquam effectus producat, quibus virium ſuarum
              <lb/>
            cauſam magis occultando, cum mortalium ſolertia late ludit, arrogan-
              <lb/>
            temque ſagacitatis fiduciam compeſcit. </s>
            <s xml:id="echoid-s3649" xml:space="preserve">Intelligi tamen facile poteſt
              <lb/>
            quomodo in tentamine primo ambæ Verſorii extremitates a cuſpide
              <lb/>
            eâdem alterius Verſorii attrahebantur: </s>
            <s xml:id="echoid-s3650" xml:space="preserve">Verſorii enim propoſiti extre-
              <lb/>
            mitasAuſtralis aCuſpideBorea alterius ante ullum Magnetis contactum
              <lb/>
            attrahebatur, vis hæc in Ferro longiſſimo permanſit, etiamſi Ma-
              <lb/>
            gnes extremo oppoſito fuerit applicatus: </s>
            <s xml:id="echoid-s3651" xml:space="preserve">Concipiatur ergo </s>
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