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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          <pb o="78" file="0088" n="88" rhead="CAPVT IV."/>
          <p>
            <s xml:id="echoid-s1762" xml:space="preserve">A. </s>
            <s xml:id="echoid-s1763" xml:space="preserve">Denotés two Furnaces, whoſe Fire places are B, 1,
              <lb/>
            2, and their Funnel or chimney C. </s>
            <s xml:id="echoid-s1764" xml:space="preserve">in theſe two Furnaces
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            are placed two Veſſels of Copper, which he calls Boy-
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            lers, the one a larger as L, the other a ſmaller as D. </s>
            <s xml:id="echoid-s1765" xml:space="preserve">Theſe
              <lb/>
            Boylers have each a Gage Pipe as G and N, of which G
              <lb/>
            goes within eight Inches of the Bottom, but N reaches
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            only half way down the great Boyler,</s>
          </p>
          <p>
            <s xml:id="echoid-s1766" xml:space="preserve">By theſe Pipes, before the Engine can worck, you
              <lb/>
            muſt firſt fill the ſmall Boyler quite full, and the great
              <lb/>
            Boyler two Thirds full of water. </s>
            <s xml:id="echoid-s1767" xml:space="preserve">Thenlight the Fire
              <lb/>
            at B
              <emph style="sub">1</emph>
            , and make the water in L boil, by which means
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            the Steam of it being, quite confined, muſt needs be
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            wonderfully compreſſed, and therefore will, on the
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            opening of a way for it to iſſue out, (which is done
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            by turning Z the Handle of the regulator from you)
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            ruſh with a great Force thro the Steam Pipe O
              <emph style="sub">1</emph>
            , into
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            the Receiver P
              <emph style="sub">1</emph>
            , driving all the Air before it, and for-
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            cing it up into the Force Pipe, through the Clack R
              <emph style="sub">1</emph>
            ,
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            as you will perceiue by the Noiſe and Ratling of the
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            Clack; </s>
            <s xml:id="echoid-s1768" xml:space="preserve">And when all the Air is thus driven out, the
              <lb/>
            Receiver P
              <emph style="sub">1</emph>
            , will be very much heated, by the Steam.
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            </s>
            <s xml:id="echoid-s1769" xml:space="preserve">when you find, that it is throughly emptied, and is
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            grown very hot, as you may both ſee and feel, then
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            pull the handle of theregulator towards you, by which
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            means you will ſtop the ſteam Pipe O
              <emph style="sub">1</emph>
            , ſo that no mo-
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            re Steam can yet come into it, but you will open it a
              <lb/>
            way into O
              <emph style="sub">2</emph>
            , and by that means fill the Receiver P
              <emph style="sub">2</emph>
            ,
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            with the Steam, as the other was before. </s>
            <s xml:id="echoid-s1770" xml:space="preserve">While this
              <lb/>
            is doing, let ſome cold Water be poured on the Re-
              <lb/>
            ceiver P
              <emph style="sub">1</emph>
            , by which means the Steam there being coo-
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            led, and condenſed, and contracted into a very little
              <lb/>
            room, and conſequently preſſing, but very little, (if at
              <lb/>
            all) on the Value or Clack R
              <emph style="sub">1</emph>
            , at the bottom of </s>
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