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-div120" type="section" level="1" n="120">
          <pb o="155" file="0169" n="169" rhead="DE MAGNETE"/>
          <note position="right" xml:space="preserve">
            <lb/>
          Anno # # Grad. # Minut.
            <lb/>
          1717 # circa initium æſtatis # 10 # 42
            <lb/>
          # 26 Novembris # 10 # 55
            <lb/>
          1724 # 13 Auguſti # 11 # 45
            <lb/>
          1725 # 14 Junii # 11 # 56
            <lb/>
          </note>
          <p>
            <s xml:id="echoid-s3878" xml:space="preserve">Ex quibus obſervationibus attribuit Acui progreſſum 9, 15``, pro
              <lb/>
            quolibet Anno: </s>
            <s xml:id="echoid-s3879" xml:space="preserve">Si numerus rotundus 9 ſumatur pro vero, tum ſpa-
              <lb/>
            tio 2400 Annorum integrum circuitum Declinatio abſolveret. </s>
            <s xml:id="echoid-s3880" xml:space="preserve">Su-
              <lb/>
            ſpicatur Whiſtonus revolutionem peractum iri intra 1920 Annos:
              <lb/>
            </s>
            <s xml:id="echoid-s3881" xml:space="preserve">Revera reſtant in hac doctrinâ Magnetica, quæ nequaquam accu-
              <lb/>
            rate determinari hucuſque poſſunt: </s>
            <s xml:id="echoid-s3882" xml:space="preserve">Verſamur tantum in principio
              <lb/>
            hujus ſcientiæ, quæ modo poſt plurimos annos, ac poſt multas
              <lb/>
            obſervationes perfici & </s>
            <s xml:id="echoid-s3883" xml:space="preserve">demonſtrari poterit.</s>
            <s xml:id="echoid-s3884" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3885" xml:space="preserve">Scholion. </s>
            <s xml:id="echoid-s3886" xml:space="preserve">Videntur Brittanni primi de integrâ revolutione Acus,
              <lb/>
            aut poli Magnetici terreſtris cogitaſſe, unde aliquis, nomine Phi-
              <lb/>
            lips, aſſeruit, hanc revolutionem peractum iriſpatio 370 annorum:
              <lb/>
            </s>
            <s xml:id="echoid-s3887" xml:space="preserve">deinde Bondius eam intra 600 annos perfici credidit, in Treatiſe
              <lb/>
            Longitude found, p. </s>
            <s xml:id="echoid-s3888" xml:space="preserve">2. </s>
            <s xml:id="echoid-s3889" xml:space="preserve">ad 9. </s>
            <s xml:id="echoid-s3890" xml:space="preserve">Magnus in arte Halleyus conjecta-
              <lb/>
            bat eam abſolvi intra 700 circiter annos.</s>
            <s xml:id="echoid-s3891" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3892" xml:space="preserve">Corol. </s>
            <s xml:id="echoid-s3893" xml:space="preserve">6. </s>
            <s xml:id="echoid-s3894" xml:space="preserve">Si Tabulam Brittannicam comparemus cum Pariſienſi,
              <lb/>
            obſervamus in Brittannia Acum 9 annis citius verum Boream indi-
              <lb/>
            caſſe, quam Pariſiis; </s>
            <s xml:id="echoid-s3895" xml:space="preserve">quod provenire videtur, quia Londinum 2°,
              <lb/>
            25` jacet occidentalius.</s>
            <s xml:id="echoid-s3896" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3897" xml:space="preserve">Auzoutus Romæ obſervavit Anno 1670 Declinationem eſſe vel
              <lb/>
            2 Graduum, vel 2°, 30` verſus Occaſum, uti notatum eſt in Phi-
              <lb/>
            loſ. </s>
            <s xml:id="echoid-s3898" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s3899" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s3900" xml:space="preserve">58. </s>
            <s xml:id="echoid-s3901" xml:space="preserve">Jacet autem Roma Orientalius 11°, 48` Lutetiis,
              <lb/>
            quare major Declinatio verſus Occaſum Romæ fuit, quam eodem
              <lb/>
            anno Lutetiis, imo & </s>
            <s xml:id="echoid-s3902" xml:space="preserve">major fuit Londini hoc anno, licet Londi-
              <lb/>
            num jaceat occidentalius, & </s>
            <s xml:id="echoid-s3903" xml:space="preserve">fuit hic Declinatio fere eadem, quæ Ro-
              <lb/>
            mæ, quod indicat, fere æqualiter utrimque a linea experte Decli-
              <lb/>
            nationis Londinum & </s>
            <s xml:id="echoid-s3904" xml:space="preserve">Romam tum abfuiſſe.</s>
            <s xml:id="echoid-s3905" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3906" xml:space="preserve">Interim admirandum eſt, cum Pariſiis anno 1666 nulla fuerit De-
              <lb/>
            clinatio, uti Londini Anno 1657, & </s>
            <s xml:id="echoid-s3907" xml:space="preserve">ante hoc tempus Acus græciſſabat,
              <lb/>
            ipſam tamen Regiomonti diu ante fuiſſe Occidentalem & </s>
            <s xml:id="echoid-s3908" xml:space="preserve">poſtea ita
              <lb/>
            manſiſſe: </s>
            <s xml:id="echoid-s3909" xml:space="preserve">notat enim Hevelius, ſuum præceptorem Crugerum, </s>
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