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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            deorſum premi horizontem verſus, atque extremum Auſtrale in
              <lb/>
            hemiſphærio Terræ Auſtrali inclinari deorſum, elevari autem Bo-
              <lb/>
            reum, quia polus Magnetis Terreſtris Boreus prævalet in Terræ
              <lb/>
            patte Borea atque ad ſe attrahit Verſorii extremum Boreum,
              <lb/>
            verum polus Auſtralis ejuſdem Magnetis prævalet in Terræ he-
              <lb/>
            miſphærio Auſtrali, unde verſus ſe extremum Auſtrale Acus deter-
              <lb/>
            minat: </s>
            <s xml:id="echoid-s6339" xml:space="preserve">Quoniam igitur per Experim CXXXVI. </s>
            <s xml:id="echoid-s6340" xml:space="preserve">inferior cuſpis virgæ
              <lb/>
            perpendiculariter poſitæ in hac regione polum Auſtralem Verſorii
              <lb/>
            attrahit, vi Borei poli a Terreſtri Magnete imprægnatur, quod fit,
              <lb/>
            quia inferior virgæ pars illi polo proxima eſt, adeoque tamdiu hæc
              <lb/>
            pars inferior virtutem poli Borei acci piet, quamdiu hæc propior
              <lb/>
            huic polo quam Auſtrali Magnetis fuerit, ſimulac vero cuſpis vir-
              <lb/>
            gæ inferior propius acceſſerit ad polum Magnetis Terreſtris Auſtra-
              <lb/>
            lem, hujus vim accipiet, plane oppoſitam priori, adeoque cuſpis
              <lb/>
            virgæ inferior attrahet polum Verſorii Boreum: </s>
            <s xml:id="echoid-s6341" xml:space="preserve">in eâ autem Ter-
              <lb/>
            ræ parte, in quâ vis utriuſque poli Magnetis Terreſtris ſibi eſt æ-
              <lb/>
            quilibrata, cuſpis virgæ inferior nulla vi donabitur: </s>
            <s xml:id="echoid-s6342" xml:space="preserve">Idcirco obſer-
              <lb/>
            vata fuit virgæ cuſpis inferior vi poli Borei Terreſtris imprægnata in
              <lb/>
            Terræ parte Septentrionali uſque ad latitudinem Auſtralem 8°, 17.
              <lb/>
            </s>
            <s xml:id="echoid-s6343" xml:space="preserve">quia huc uſque visillius poliMagnetici ſeſe extendit; </s>
            <s xml:id="echoid-s6344" xml:space="preserve">ultraLatitudinem
              <lb/>
            vero 15 graduum Auſtralem vis poliMagnetisAuſtralis prædominari in-
              <lb/>
            cepit, atque cum virgæ infimo extremo virtutem ſuam communicans,
              <lb/>
            fecitut hoc Verſorii polum Boreum attraxerit: </s>
            <s xml:id="echoid-s6345" xml:space="preserve">Erat utriuſque poliMa-
              <lb/>
            gnetici virtus fere in æquilibrio a latitudine Meridionali 0°, 52? </s>
            <s xml:id="echoid-s6346" xml:space="preserve">ad
              <lb/>
            8°. </s>
            <s xml:id="echoid-s6347" xml:space="preserve">17. </s>
            <s xml:id="echoid-s6348" xml:space="preserve">hinc vix vi quadam imprægnabatur virgæ extremum utrum-
              <lb/>
            que. </s>
            <s xml:id="echoid-s6349" xml:space="preserve">Vidimus in Inclinationibus â Noellio obſervatis, Inclinatio-
              <lb/>
            nem Acus perpetuo imminui a latitudine Borea 38°, 40?</s>
            <s xml:id="echoid-s6350" xml:space="preserve">, uſque ad
              <lb/>
            Latitudinem Meridionalem 6°, 30?</s>
            <s xml:id="echoid-s6351" xml:space="preserve">. indicio vim poli Borei Magne-
              <lb/>
            tis Terreſtris eo uſque exporrigi: </s>
            <s xml:id="echoid-s6352" xml:space="preserve">inde autem recedendo magis ab
              <lb/>
            Æquatore Auſtrum verſus, inverſa fuit Inclinatoria Acus, & </s>
            <s xml:id="echoid-s6353" xml:space="preserve">cu-
              <lb/>
            ſpis, quæ in Septentrionali parte Terræ horizontem ſpectaverat, nunc
              <lb/>
            cœlum verſus dirigebatur, polo nempe Auſtralis Magnetis prædo-
              <lb/>
            minante, cujus vis fortior evaſit, donec ad latitudinem 35°, 25? </s>
            <s xml:id="echoid-s6354" xml:space="preserve">
              <lb/>
            validiſſima fuerit, atque Acum ad horizontem perpendiculariter
              <lb/>
            erexerit, ideo quoque in præſenti obſervatione recte notatum fuit,
              <lb/>
            ad latitudinem Meridionalem 20° & </s>
            <s xml:id="echoid-s6355" xml:space="preserve">ulterius uſque ad 29° virgæ </s>
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