Weidler, Johann Friedrich, Jo. Friderici Weidleri Tractatus de machinis hydraulicis toto terrarum orbe maximis Marlyensi et Londinensi et aliis rarioribus similibus in quo mensurae prope ipsas machinas notatae describuntur, et de viribus earum luculenter disseritur

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          <p>
            <s xml:id="echoid-s1770" xml:space="preserve">
              <pb o="79" file="0089" n="89" rhead="DE MACHINA HYDRAVL. LONDINENSI."/>
            Receiver P
              <emph style="sub">1</emph>
            , There is nothing there to countrebal-
              <lb/>
            lance, the preſſure of the Atmoſphere, on the ſurface
              <lb/>
            of the Water, in the lower Part of the Suking Pipe T;
              <lb/>
            </s>
            <s xml:id="echoid-s1771" xml:space="preserve">where fore it will be preſſed up, and aſcend into, and
              <lb/>
            fill the Receiver P
              <emph style="sub">1</emph>
            , driving out before it as it raiſes,
              <lb/>
            the Clack or Valve R
              <emph style="sub">3</emph>
            , which afterwards falling down
              <lb/>
            again and ſhutting cloſe hinders the deſcent of the wa-
              <lb/>
            ter that way. </s>
            <s xml:id="echoid-s1772" xml:space="preserve">Then (the Receiver P
              <emph style="sub">2</emph>
            , being in the
              <lb/>
            mean time emptied of its Air) turn the handle of the
              <lb/>
            Regulator from you, and the Force of the Steam co-
              <lb/>
            ming from the Boyler, will be all upon the ſurface of the
              <lb/>
            Water contained in the Receiver P
              <emph style="sub">1</emph>
            , where it grauita-
              <lb/>
            tes or preſſes hard upon it, and ſtill encreaſes, its Spring
              <lb/>
            or elaſticity, till it comes to overballance, or exceed
              <lb/>
            the Weight of the Water into the Receiver, which
              <lb/>
            then it will neceffarly drive up through the Paſſage Q,
              <lb/>
            R, Q, Q, into the Force Pipe S, and at laſt diſcharge it
              <lb/>
            out at the Top, as you ſee in the Figure.</s>
            <s xml:id="echoid-s1773" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1774" xml:space="preserve">After the very ſame manner, tho alternately, is the
              <lb/>
            Receiver P
              <emph style="sub">2</emph>
            filled with, and emptied of Water, and
              <lb/>
            by this Means a conſtant Steam is kept continually
              <lb/>
            running out at the Top of the Force Pipe S, and ſo the
              <lb/>
            water is raiſed very eaſily from the bottom of the mine
              <lb/>
            etc. </s>
            <s xml:id="echoid-s1775" xml:space="preserve">to the place, where it is deſigned to be diſcharged.</s>
            <s xml:id="echoid-s1776" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1777" xml:space="preserve">Only 1 ſhould add, that after the Engine begins to
              <lb/>
            work, and the water is
              <gap/>
            ſen into, and hath filled the
              <lb/>
            Force Pipe S, then it fills the little Ciſtern X, and by
              <lb/>
            that means feeds the Pipe yy, which he calls the con-
              <lb/>
            denſing Pipe, becauſe Water is conveyed down from
              <lb/>
            thence, to cool the receivers, when troughly heated
              <lb/>
            by the Steam, in order to make them Suck (at t'is u-
              <lb/>
            ſually called) the Water out of the well up into the
              <lb/>
            Receiver.</s>
            <s xml:id="echoid-s1778" xml:space="preserve"/>
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