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="244" file="0258" n="258" rhead="DISSERTATIO"/>
            tremitates, A, a affricabantur Magnetis polo Boreo, extremitates
              <lb/>
            B, b polo Magnetis Auſtrino, tum circa ambos, in plano vitreo
              <lb/>
            poſitos, parum a ſe remotos circumſperſa fuit Arena Indica, quæ
              <lb/>
            circa extrema A, a, ut & </s>
            <s xml:id="echoid-s5786" xml:space="preserve">B, b, in ſeries rectilineas ordinata fuit,
              <lb/>
            ad medium tamen utriuſque ſemicirculi formabantur ſeries cur-
              <lb/>
            vilineæ ad C & </s>
            <s xml:id="echoid-s5787" xml:space="preserve">D. </s>
            <s xml:id="echoid-s5788" xml:space="preserve">in ſpatio a circulo intercepto arena in re-
              <lb/>
            ctas quoque diſpoſita fuit lineas, parva excepta portione, quæ
              <lb/>
            e regione punctorum C & </s>
            <s xml:id="echoid-s5789" xml:space="preserve">D fuit: </s>
            <s xml:id="echoid-s5790" xml:space="preserve">ordines ſerierum ſimillimi fue-
              <lb/>
            runt iis, quos fig. </s>
            <s xml:id="echoid-s5791" xml:space="preserve">8. </s>
            <s xml:id="echoid-s5792" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s5793" xml:space="preserve">6. </s>
            <s xml:id="echoid-s5794" xml:space="preserve">in integro annulo exhibuit; </s>
            <s xml:id="echoid-s5795" xml:space="preserve">adeo
              <lb/>
            ut illi ex his intelligi & </s>
            <s xml:id="echoid-s5796" xml:space="preserve">exponi nunc queant. </s>
            <s xml:id="echoid-s5797" xml:space="preserve">In fig. </s>
            <s xml:id="echoid-s5798" xml:space="preserve">6. </s>
            <s xml:id="echoid-s5799" xml:space="preserve">ſunt a A,
              <lb/>
            duo poli cognomines, ſe fugantes, nam ambo hæc extrema ſu-
              <lb/>
            per eodem Magnetis polo ducta fuerunt; </s>
            <s xml:id="echoid-s5800" xml:space="preserve">ita B, b ſunt duo poli
              <lb/>
            cognomines ſe eodem modo fugantes; </s>
            <s xml:id="echoid-s5801" xml:space="preserve">quare hic dantur 4 poli ad
              <lb/>
            extremitates A, a, B, b, Quia vero hi excitant effectus omni-
              <lb/>
            no eoſdem, quos in integro adnotavimus annulo fig. </s>
            <s xml:id="echoid-s5802" xml:space="preserve">8, in hoc
              <lb/>
            quoque 4 poli dabuntur, quorum duo cognomines hærebunt ad
              <lb/>
            A, bini alii ad B. </s>
            <s xml:id="echoid-s5803" xml:space="preserve">Annulus hinc integer in duabus ſibi diametrali-
              <lb/>
            ter oppoſitis partibus ſuper Magnetis ambobus polis frictus, 4 po-
              <lb/>
            los accipiet, in utraque parte attractâ duos.</s>
            <s xml:id="echoid-s5804" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s5805" xml:space="preserve">Converſus deinde alteruter ſemicirculus fuit uti in Tab. </s>
            <s xml:id="echoid-s5806" xml:space="preserve">6. </s>
            <s xml:id="echoid-s5807" xml:space="preserve">fig.
              <lb/>
            </s>
            <s xml:id="echoid-s5808" xml:space="preserve">7. </s>
            <s xml:id="echoid-s5809" xml:space="preserve">polo A cognominem b ſpectante, & </s>
            <s xml:id="echoid-s5810" xml:space="preserve">B polo oppoſito ſuo cogno-
              <lb/>
            mini a, ita tamen ut aliquod intervallum interceſſerit. </s>
            <s xml:id="echoid-s5811" xml:space="preserve">tum cir-
              <lb/>
            cum extrema ſeries curvilineæ formabantur, ambientes A & </s>
            <s xml:id="echoid-s5812" xml:space="preserve">b, tum
              <lb/>
            B & </s>
            <s xml:id="echoid-s5813" xml:space="preserve">a, ad aliquam uſque latitudinem: </s>
            <s xml:id="echoid-s5814" xml:space="preserve">in toto 4 curvilineæ ſeries
              <lb/>
            conſpiciebantur, & </s>
            <s xml:id="echoid-s5815" xml:space="preserve">4 ſeries, inter has mediæ, rectilineæ, quas
              <lb/>
            eodem modo ordinatas eleganter quoque deſcripſit de la Hire in
              <lb/>
            Philoſ. </s>
            <s xml:id="echoid-s5816" xml:space="preserve">Tranſact. </s>
            <s xml:id="echoid-s5817" xml:space="preserve">N°. </s>
            <s xml:id="echoid-s5818" xml:space="preserve">188.</s>
            <s xml:id="echoid-s5819" xml:space="preserve"/>
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        <div xml:id="echoid-div147" type="section" level="1" n="147">
          <head xml:id="echoid-head156" xml:space="preserve">EXPERIMENTUM CXXI.</head>
          <p>
            <s xml:id="echoid-s5820" xml:space="preserve">Inſtituit Cl. </s>
            <s xml:id="echoid-s5821" xml:space="preserve">Derhamus nonnulla Experimenta cum filis ferreis,
              <lb/>
            quæ, poſtquam Magneticis donata erant viribus, ſecundum longi-
              <lb/>
            tudinem findebantur, in quibus ſequentia animadvertit. </s>
            <s xml:id="echoid-s5822" xml:space="preserve">1°. </s>
            <s xml:id="echoid-s5823" xml:space="preserve">Polos
              <lb/>
            ſæpe inverti, ita ut Boreus evaſerit Auſtralis, haud aliter ac ſi fi-
              <lb/>
            lum de novo ſuper Magnete ductum fuiſſet directione priori oppo-
              <lb/>
            ſitâ 2°. </s>
            <s xml:id="echoid-s5824" xml:space="preserve">Aliquando dimidium fili vim Magneticam </s>
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