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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          <p>
            <s xml:id="echoid-s8528" xml:space="preserve">
              <pb o="347" file="0361" n="361" rhead="DE SPECULIS VITREIS"/>
            læ inter aſymptota E C, E F deſcriptæ.</s>
            <s xml:id="echoid-s8529" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8530" xml:space="preserve">Aſſurgit vero Mercurius ad diverſas altitudines, prout plana
              <lb/>
            vitrea ambo propius ad ſe accedunt, vel magis à ſe removentur.</s>
            <s xml:id="echoid-s8531" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8532" xml:space="preserve">Quando tamen ſpecula parum à ſe diſtant, tum inæqualitas ſu-
              <lb/>
            perſicierum ſolet facere ſenſibilem variationem in hac curvâ, nam
              <lb/>
            non poſſunt inveniri ſuperficies perfecte planæ, quales deſiderantur,
              <lb/>
            ut acquiratur linea Geometrica.</s>
            <s xml:id="echoid-s8533" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8534" xml:space="preserve">Eſt hæc curva contrario modo ſita, quam quando inſtituitur
              <lb/>
            Experimentum cum Aqua, vel Spiritu Vini, quia Mercurius ſe magis
              <lb/>
            attrahit, quam Vitrum: </s>
            <s xml:id="echoid-s8535" xml:space="preserve">idcirco ſe habet, quaſi à Vitro repelleretur;
              <lb/>
            </s>
            <s xml:id="echoid-s8536" xml:space="preserve">cumque repulſio ſit oppoſita attactioni, etiam figura contraria à
              <lb/>
            liquore repulſo, quam ab attracto, formabitur.</s>
            <s xml:id="echoid-s8537" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div242" type="section" level="1" n="242">
          <head xml:id="echoid-head265" xml:space="preserve">EXPERIMENTUM VIII.</head>
          <p>
            <s xml:id="echoid-s8538" xml:space="preserve">Tab. </s>
            <s xml:id="echoid-s8539" xml:space="preserve">13 fig. </s>
            <s xml:id="echoid-s8540" xml:space="preserve">14. </s>
            <s xml:id="echoid-s8541" xml:space="preserve">Speculum D E ponatur horizonti parallelum,
              <lb/>
            cui affundatur gutta olei deſtillati B, tum alterum ſpeculum A C
              <lb/>
            imponatur priori, ita ut extremo A tangat alterius extremum D; </s>
            <s xml:id="echoid-s8542" xml:space="preserve">ſed
              <lb/>
            extremo C tantopere diſtet ab E, ut guttæ B ſuperiorem partem vix
              <lb/>
            vix contingat: </s>
            <s xml:id="echoid-s8543" xml:space="preserve">Quibus ita compoſitis, gutta B illico moveri incipit
              <lb/>
            verſus A D, in principio lente, ſed ſemper eo velocius, quo propius
              <lb/>
            accedit ad A D, explicata quoque continuo in majorem latitudi-
              <lb/>
            nem, tandemque prope juncturam A D ſpeculorum ſe utrimque
              <lb/>
            expandit ſecundum juncturæ longitudinem.</s>
            <s xml:id="echoid-s8544" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s8545" xml:space="preserve">Sit centrum gravitatis guttæ B in o, quia ſpeculum A C ad ſe
              <lb/>
            trahitguttam, agitur hæc directione o p, perpendiculari in ſuperſi-
              <lb/>
            ciem A C, atque directione O S perpendiculari in ſuperſiciem D E:
              <lb/>
            </s>
            <s xml:id="echoid-s8546" xml:space="preserve">adeoque moveri debebit in diagonali o r parallelogrammi, cujus la-
              <lb/>
            tera duo ſunt directiones o p, o s, idcirco feretur gutta â B verſus A D. </s>
            <s xml:id="echoid-s8547" xml:space="preserve">
              <lb/>
            & </s>
            <s xml:id="echoid-s8548" xml:space="preserve">quia eadem ratio directionum trahentium obtinet quouſque
              <lb/>
            gutta ex B verſus A D perrexerit, continuabitur ejus motus uſque
              <lb/>
            ad A D. </s>
            <s xml:id="echoid-s8549" xml:space="preserve">Conſtat vero gutta ex materia non condenſabili, hinc in ar-
              <lb/>
            ctius delata ſpatium, ut expandatur pérpetuo magis magiſque neceſſe
              <lb/>
            erit. </s>
            <s xml:id="echoid-s8550" xml:space="preserve">Præterea adhæret pars guttæ ſuperior ſpeculo A C, quodpla-
              <lb/>
            num eſt inclinatum ad horizontem, ſuper quo omnia devoluta
              <lb/>
            gravia feruntur motu accelerato, ſive gutta adhæſerit inferiori hu-
              <lb/>
            jus plani ſuperficiei, ſive ſuper ipſo moveretur, idem eſt; </s>
            <s xml:id="echoid-s8551" xml:space="preserve">adeoque
              <lb/>
            quatenus gravitatem habet, motu accelerato feretur a p verſus A D: </s>
            <s xml:id="echoid-s8552" xml:space="preserve">
              <lb/>
            Inſuper quo centrum gravitatis o propius acceſſerit ad </s>
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