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="153" file="0167" n="167" rhead="DE MAGNETE."/>
          <p>
            <s xml:id="echoid-s3803" xml:space="preserve">Quinque ultimas obſervationes, mecum communicare voluerunt
              <lb/>
            Viri præſtantiſſimi Fontenellius & </s>
            <s xml:id="echoid-s3804" xml:space="preserve">Maraldi.</s>
            <s xml:id="echoid-s3805" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3806" xml:space="preserve">Ex omnibus hiſce obſervationibus nonnulla Corollaria elicere nunc
              <lb/>
            licebit.</s>
            <s xml:id="echoid-s3807" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3808" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s3809" xml:space="preserve">1. </s>
            <s xml:id="echoid-s3810" xml:space="preserve">Mutatio Declinationis non eſt proportionalis Tempori
              <lb/>
            in eodem loco Terræ. </s>
            <s xml:id="echoid-s3811" xml:space="preserve">Si enim obtineret hæc proportio, ſingulo
              <lb/>
            anno Declinatio æqualiter mutari deberet; </s>
            <s xml:id="echoid-s3812" xml:space="preserve">quod non fit, nam Sta-
              <lb/>
            tionarius fuit Magnes annis 1720, 1721, 1722. </s>
            <s xml:id="echoid-s3813" xml:space="preserve">quibus declinavit
              <lb/>
            13 gradibus verſus occaſum. </s>
            <s xml:id="echoid-s3814" xml:space="preserve">Stationarius fuit annis 1718, 1719,
              <lb/>
            quibus declinavit 12°, 30`. </s>
            <s xml:id="echoid-s3815" xml:space="preserve">itidem annis 1716, 1717, quibus de-
              <lb/>
            clinavit 12°, 20`. </s>
            <s xml:id="echoid-s3816" xml:space="preserve">verum aliis annis mutata fuit Declinatio, cum enim
              <lb/>
            anno 1700 declinabat 8°, 12`. </s>
            <s xml:id="echoid-s3817" xml:space="preserve">anno 1701 declinavit 8°, 25`, anno
              <lb/>
            1702. </s>
            <s xml:id="echoid-s3818" xml:space="preserve">8°, 48`. </s>
            <s xml:id="echoid-s3819" xml:space="preserve">& </s>
            <s xml:id="echoid-s3820" xml:space="preserve">ſic porro uſque ad annum 1711 ſingulis annis paſſa
              <lb/>
            fuit Declinatio mutationem.</s>
            <s xml:id="echoid-s3821" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3822" xml:space="preserve">Si æqualem decurſum plurium annorum ſimul ſumamus, pariter
              <lb/>
            obſervabimus, admodum inæqualem mutationem Declinationis, ne-
              <lb/>
            quaquam tempori proportionalem; </s>
            <s xml:id="echoid-s3823" xml:space="preserve">ſumamus enim 10 annos ſimul,
              <lb/>
            ab anno 1710 ad 1720. </s>
            <s xml:id="echoid-s3824" xml:space="preserve">quibus Declinatio obſervata fuit 10°, 50`,
              <lb/>
            & </s>
            <s xml:id="echoid-s3825" xml:space="preserve">13°. </s>
            <s xml:id="echoid-s3826" xml:space="preserve">quibus Declinationis differentia eſt 2°, 10. </s>
            <s xml:id="echoid-s3827" xml:space="preserve">ſed ab anno 1700
              <lb/>
            ad 1710 differentia eſt 2°, 38`. </s>
            <s xml:id="echoid-s3828" xml:space="preserve">ab anno 1670, ad 1680 differentia
              <lb/>
            fuit 1°, 10. </s>
            <s xml:id="echoid-s3829" xml:space="preserve">quare intra 10 annorum decurſum etiam non eſt æqua-
              <lb/>
            lis Declinationis differentia, quod probat Declinationem admodum
              <lb/>
            inæquali progreſſu temporis æquali intervallo, promoveri.</s>
            <s xml:id="echoid-s3830" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3831" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s3832" xml:space="preserve">2 Neque ſemper Declinatio progreditur, ſed quoque re-
              <lb/>
            trogreditur aliquando: </s>
            <s xml:id="echoid-s3833" xml:space="preserve">Nam anno 1712 Declinatio fuit 11°, 15`. </s>
            <s xml:id="echoid-s3834" xml:space="preserve">& </s>
            <s xml:id="echoid-s3835" xml:space="preserve">
              <lb/>
            anno 1713 fuit 11°, 12`. </s>
            <s xml:id="echoid-s3836" xml:space="preserve">adeoque retrogreſſa fuit 3 Minutis. </s>
            <s xml:id="echoid-s3837" xml:space="preserve">ita quo-
              <lb/>
            que anno 1714 fuit Declinatio 11°, 30`. </s>
            <s xml:id="echoid-s3838" xml:space="preserve">quæ anno 1715 tantum fuit
              <lb/>
            11°, 10`. </s>
            <s xml:id="echoid-s3839" xml:space="preserve">ſic anno 1717 fuit 12°, 45`. </s>
            <s xml:id="echoid-s3840" xml:space="preserve">& </s>
            <s xml:id="echoid-s3841" xml:space="preserve">1718 fuit 12°, 30`. </s>
            <s xml:id="echoid-s3842" xml:space="preserve">nec mo-
              <lb/>
            do his ultimis temporibus retrograda fuit, ſed etiam anno 1681, quo
              <lb/>
            declinabat Acus 2°, 30`. </s>
            <s xml:id="echoid-s3843" xml:space="preserve">cum declinaverat Anno 1680, 2°, 40`.</s>
            <s xml:id="echoid-s3844" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3845" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s3846" xml:space="preserve">3. </s>
            <s xml:id="echoid-s3847" xml:space="preserve">Cum igitur motus Declinationis ſit adeo diverſus, mo-
              <lb/>
            tus aliquis medius pro ſingulis annis inveniri poteſt, quia enim ſpa-
              <lb/>
            tio 56 annorum Declinatio mutata fuit 13 gradubus, hi dividantur
              <lb/>
            per 56 annos, prodeunt 13 {52/76} Minuta, ſive circiter 14 Minuta pro quo-
              <lb/>
            libet anno, qui Declinationis progreſſus poteſt vocari Motus medius.</s>
            <s xml:id="echoid-s3848" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3849" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s3850" xml:space="preserve">4. </s>
            <s xml:id="echoid-s3851" xml:space="preserve">Eſt progreſſus Declinationis a vero Septentrione ad </s>
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