Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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          <pb o="769" file="0513" n="535"/>
          <figure number="233">
            <image file="0513-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0513-01"/>
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        <div xml:id="echoid-div518" type="section" level="1" n="198">
          <head xml:id="echoid-head283" xml:space="preserve">CHRISTIANI HUGENII
            <lb/>
          EXPERIMENTA
            <lb/>
          PHYSICA.</head>
          <head xml:id="echoid-head284" style="it" xml:space="preserve">Excerpta ex literis D
            <emph style="super">ni</emph>
          Hugenii, Academiæ regiæ ſcien-
            <lb/>
          tiarum Socii, ad Auctorem Diarii Eruditorum, de
            <lb/>
          Phænomenis aquæ aëre purgatæ.</head>
          <p>
            <s xml:id="echoid-s10852" xml:space="preserve">ANtequam tibi communicarem quæ obſervavi
              <lb/>
            de ſuſpenſione aquæ in vacuo, altera vice ex-
              <lb/>
            perimenta inſtituere volui, ut de obſervatio-
              <lb/>
            nibus olim a me factis certus eſſem, & </s>
            <s xml:id="echoid-s10853" xml:space="preserve">ut
              <lb/>
            melius penetrare poſſem in cauſas miri adeo
              <lb/>
            effectus. </s>
            <s xml:id="echoid-s10854" xml:space="preserve">Primum tibi ipſas referam obſerva-
              <lb/>
            tiones, & </s>
            <s xml:id="echoid-s10855" xml:space="preserve">dein pergam ad conjecturas de ipſarum cauſa.</s>
            <s xml:id="echoid-s10856" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s10857" xml:space="preserve">Experimenta quæ illuſtris Boyleus anno 1661 publicavit,
              <lb/>
            cum deſcriptione machinæ Pneumaticæ mihi ab eo tempore
              <lb/>
            dederunt occaſionem examinandi hanc materiam; </s>
            <s xml:id="echoid-s10858" xml:space="preserve">Unum ex
              <lb/>
            experimentis illius eſt, ſi tubo vitreo, 4 pedes longo, aqua re-
              <lb/>
            pleto, cujus extremitas aperta, everſo tubo, immergitur aqua
              <lb/>
            vitro contento, ſuperimponas recipiens vel vas, unde aër
              <lb/>
            educitur, poſt exhauſtum aërem, quantum ope machinæ
              <lb/>
            fleri poteſt, aqua tubi deſcendet in vitrum, donec ad altitu-
              <lb/>
            dinem unius tantum pedis ſuſtineatur, ſuperiore tubi parte
              <lb/>
            aquâ & </s>
            <s xml:id="echoid-s10859" xml:space="preserve">aëre manente vacuâ. </s>
            <s xml:id="echoid-s10860" xml:space="preserve">Cenſet optime, aquam ad illam
              <lb/>
            altitudinem unius pedis ſupra ſuperficiem aquæ in </s>
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