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-s4916" xml:space="preserve">Quæſitum fuit a Philoſophis quot poli Magnetici in Terrâ den-
              <lb/>
            tur? </s>
            <s xml:id="echoid-s4917" xml:space="preserve">Ubinam ſiti? </s>
            <s xml:id="echoid-s4918" xml:space="preserve">An in ſuperficie Terræ, an ad aliquam ſub ipſa
              <lb/>
            profunditatem demerſi? </s>
            <s xml:id="echoid-s4919" xml:space="preserve">Quanam latitudine donati? </s>
            <s xml:id="echoid-s4920" xml:space="preserve">An firmi ſtabi-
              <lb/>
            leſque, an moveantur, & </s>
            <s xml:id="echoid-s4921" xml:space="preserve">qua velocitate? </s>
            <s xml:id="echoid-s4922" xml:space="preserve">Quæ omnia ſi a morta-
              <lb/>
            libus cognoſcerentur, quam plurimum lucis doctrinæ Magneticæ
              <lb/>
            affunderent, tum enim a priori poſſet determinari, qualis & </s>
            <s xml:id="echoid-s4923" xml:space="preserve">quan-
              <lb/>
            ta Declinatio aut Inclinatio Acuum Magneticarum hoc tempore in
              <lb/>
            dato loco regnaret, quod in re nautica magni foret momenti, cum
              <lb/>
            ex eo longitudines locorum, adeo avide â nautis deſideratas, cogno-
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            ſceremus exactius, quam ullis aliis hucuſque cognitis modis.</s>
            <s xml:id="echoid-s4924" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4925" xml:space="preserve">Quoniam Acus ferrea impoſita polo Magnetis perpendiculariter
              <lb/>
            erigitur, etiam Acus Inclinatoria delata ſupra eum in Terra locum,
              <lb/>
            qui vel polus eſt, aut ſupra polum directe jacet, perpendiculariter
              <lb/>
            ad horizontem erigetur, adeoque oportebit ea quærere Telluris
              <lb/>
            loca, in quibus obſervatur A cus Inclinatoria perpendiculariter eri-
              <lb/>
            gi: </s>
            <s xml:id="echoid-s4926" xml:space="preserve">Videtur igitur hoc tempore polus dari Boreus Magneticus, ad
              <lb/>
            latitudinem 76 grad. </s>
            <s xml:id="echoid-s4927" xml:space="preserve">30 Minut proinde 13°, 30 a polo Boreo Ter-
              <lb/>
            ræ. </s>
            <s xml:id="echoid-s4928" xml:space="preserve">hujus longitudo eſt circiter 30 graduum ad Ortum Meridiani
              <lb/>
            Londinenſis: </s>
            <s xml:id="echoid-s4929" xml:space="preserve">Polum hic poni arbitramur, quia Hudſonus in itine-
              <lb/>
            re Septentrionem verſus Anno 1607 & </s>
            <s xml:id="echoid-s4930" xml:space="preserve">1608 inſtituto, perveniens
              <lb/>
            adlatitudinem 75°, 22?</s>
            <s xml:id="echoid-s4931" xml:space="preserve">, Bor. </s>
            <s xml:id="echoid-s4932" xml:space="preserve">obſervavit Inclinationem Acus fuiſſe 89
              <lb/>
            grad. </s>
            <s xml:id="echoid-s4933" xml:space="preserve">vel 89°, 30?</s>
            <s xml:id="echoid-s4934" xml:space="preserve">. bis vero deprehendit depreſſionem 84° ad di-
              <lb/>
            ſtantiam circiter 12, vel 13 grad. </s>
            <s xml:id="echoid-s4935" xml:space="preserve">magni circuli, ſemel, antequam
              <lb/>
            perveniebat ad locum dictum Noordcaap, & </s>
            <s xml:id="echoid-s4936" xml:space="preserve">deinde in nova Zem-
              <lb/>
            la. </s>
            <s xml:id="echoid-s4937" xml:space="preserve">Whiſtonus hic polum Magnetis primus locavit, candide tamen
              <lb/>
            confeſſus, hanc poli determinationem inniti tantum uni obſervatio-
              <lb/>
            ni Hudſoni, atque ab eo forſitan Inclinationem Acus potius ſcri-
              <lb/>
            ptam eſſe 86°, 30?</s>
            <s xml:id="echoid-s4938" xml:space="preserve">, quam 89°, 30?</s>
            <s xml:id="echoid-s4939" xml:space="preserve">. neque poſt Hudſonum alias ob-
              <lb/>
            ſervationes in parte Borea terræ cum Acu Inclinatoria factas acce-
              <lb/>
            pimus, quamobrem abſolute demonſtrari nequit polum Magneticum
              <lb/>
            ibi loci jacere: </s>
            <s xml:id="echoid-s4940" xml:space="preserve">abſque ullo dubio Occidentem & </s>
            <s xml:id="echoid-s4941" xml:space="preserve">Boream verſus
              <lb/>
            noſtri reſpectu polus jacet, quia Acus plus declinat in Anglia quam
              <lb/>
            in Hollandia, & </s>
            <s xml:id="echoid-s4942" xml:space="preserve">magis adhuc, quo locus eſt Borealior, & </s>
            <s xml:id="echoid-s4943" xml:space="preserve">Occi-
              <lb/>
            dentalior, id tamen non ſufficit ad abſolutam ſcientiam veri loci
              <lb/>
            comparandam, quare optandum eſſet, ut nautæ, qui in piſcandis balæ-
              <lb/>
            nis occupati, Boreas regiones inviſunt, ope probæ Acus </s>
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