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-s3909" xml:space="preserve">
              <pb o="156" file="0170" n="170" rhead="DISSERTATIO"/>
            no 1628 obſervaſſe Declinationem 1 gradus occidentalem, anno
              <lb/>
            1642 eam ſe cum Linnemanno deprehendiſſe 3°, 5 occidentalem,
              <lb/>
            anno 1670 graduum 7, Minut. </s>
            <s xml:id="echoid-s3910" xml:space="preserve">20. </s>
            <s xml:id="echoid-s3911" xml:space="preserve">vide Philoſ. </s>
            <s xml:id="echoid-s3912" xml:space="preserve">Tranſ. </s>
            <s xml:id="echoid-s3913" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s3914" xml:space="preserve">64. </s>
            <s xml:id="echoid-s3915" xml:space="preserve">pag.
              <lb/>
            </s>
            <s xml:id="echoid-s3916" xml:space="preserve">2060.</s>
            <s xml:id="echoid-s3917" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3918" xml:space="preserve">Obſervatum autem eſt præterea, non in omni loco Terræ fieri in-
              <lb/>
            tra idem tempus eandem quantitatem variationis: </s>
            <s xml:id="echoid-s3919" xml:space="preserve">Nam Caſſini ad-
              <lb/>
            notavit intra 37 Annos eam in Quebecq modo fuiſſe 30 Minutorum:
              <lb/>
            </s>
            <s xml:id="echoid-s3920" xml:space="preserve">Deliſle etiam obſervavit intra 11 annos variationem ibi fuiſſe 1 gra-
              <lb/>
            dus. </s>
            <s xml:id="echoid-s3921" xml:space="preserve">vid. </s>
            <s xml:id="echoid-s3922" xml:space="preserve">L’ Hiſtoir. </s>
            <s xml:id="echoid-s3923" xml:space="preserve">de L’ Acad. </s>
            <s xml:id="echoid-s3924" xml:space="preserve">Roy. </s>
            <s xml:id="echoid-s3925" xml:space="preserve">1712. </s>
            <s xml:id="echoid-s3926" xml:space="preserve">Sed Pariſiis fuit ab A°. </s>
            <s xml:id="echoid-s3927" xml:space="preserve">
              <lb/>
            1666. </s>
            <s xml:id="echoid-s3928" xml:space="preserve">ad 1696 æqualis 7°, 8`. </s>
            <s xml:id="echoid-s3929" xml:space="preserve">& </s>
            <s xml:id="echoid-s3930" xml:space="preserve">intra 11 annos ultimo obſervatos fuit
              <lb/>
            æqualis 1°, 48`.</s>
            <s xml:id="echoid-s3931" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3932" xml:space="preserve">Monui autem ſuperius, non modo ſingulo anno, ſed ſingulo menſe
              <lb/>
            & </s>
            <s xml:id="echoid-s3933" xml:space="preserve">die Declinationem eſſe diverſam; </s>
            <s xml:id="echoid-s3934" xml:space="preserve">quod conſtat ex obſervationi-
              <lb/>
            bus a Patre Guy Tachart factis anno 1682; </s>
            <s xml:id="echoid-s3935" xml:space="preserve">cum enim coram Rege
              <lb/>
            Siammenſi in urbe Louvo ejuſdem Regni ad Acum attendebat, in-
              <lb/>
            venit eam declinaſſe verſus Occidentem uno die 16 Minutis, ſecun-
              <lb/>
            do die 31 M`. </s>
            <s xml:id="echoid-s3936" xml:space="preserve">tertio die 35 M`. </s>
            <s xml:id="echoid-s3937" xml:space="preserve">quarto die 38 M`. </s>
            <s xml:id="echoid-s3938" xml:space="preserve">Aliis autem die-
              <lb/>
            bus ejuſdem anni, inter quos non interceſſit longum intervallum,
              <lb/>
            obſervavit Deviationem 28 Minutorum, altero die 33 M`. </s>
            <s xml:id="echoid-s3939" xml:space="preserve">tertio die
              <lb/>
            21 M`. </s>
            <s xml:id="echoid-s3940" xml:space="preserve">vide Itinerarium ejuſdem pag. </s>
            <s xml:id="echoid-s3941" xml:space="preserve">224, 225. </s>
            <s xml:id="echoid-s3942" xml:space="preserve">Septem hæ obſer-
              <lb/>
            vationes procul dubio ſunt intra menſis ſpatium factæ; </s>
            <s xml:id="echoid-s3943" xml:space="preserve">ex quibus
              <lb/>
            liquet, Acum ſingulo die aliam variationem oſtendere. </s>
            <s xml:id="echoid-s3944" xml:space="preserve">Neſcio an
              <lb/>
            ante huncPatrem aliquis hanc quotidianam mutationem obſervaverit:
              <lb/>
            </s>
            <s xml:id="echoid-s3945" xml:space="preserve">Eandem confirmare poſſum propriâ experientiâ, nam</s>
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            <lb/>
          # # # Grad. # Minut.
            <lb/>
          Anno 1728. # 8 # Martii fuit Trajecti Declinatio # 13 # 20
            <lb/>
          # 8 # Aprilis # 13 # 15
            <lb/>
          # 10 # # 13 # 19
            <lb/>
          # 11 # # 13 # 20
            <lb/>
          # 12 # # 13 # 20
            <lb/>
          # 15 # # 13 # 14
            <lb/>
          # 16 # # 13 # 15
            <lb/>
          # 17 # # 13 # 15
            <lb/>
          # 18 # # 13 # 15
            <lb/>
          # 19 # # 13 # 15
            <lb/>
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