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="80" file="0090" n="90" rhead="CAPVT IV."/>
          <p>
            <s xml:id="echoid-s1779" xml:space="preserve">Alſo a little above that ciſtern goes the Pipe E,
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            which conveys water from the Force Pipe into D, the
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            leſſer Boyler, which is there placed to repleniſh the
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            great Boyler L, when the Water in it begins to be al-
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            moſt conſumed. </s>
            <s xml:id="echoid-s1780" xml:space="preserve">Now when there is need of doing
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            this, turn the Cock E ſo, that there can be no commu-
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            nication between the Force Pipe S, and theleſſer Boy-
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            ler D, and putting in a little Fire, at B
              <emph style="sub">2</emph>
            , the Water the-
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            re will grow preſently hot; </s>
            <s xml:id="echoid-s1781" xml:space="preserve">and when it boils, its own
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            Steam, which hath no vent out, preſſing on its ſurface,
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            will force the Water up the Pipe H, trough K, into
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            the great Boyler L, and ſo long will it run, till the ſur-
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            face of the Water in the Boyler D, get to be as low,
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            as the bottom of the Pipe H, and then the Steam and
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            Water will run together, and by its Noiſe and Ratling
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            of the Clack 1, will giue him that worcks the Engine,
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            ſufficient aſſurance, that D hath emptied and diſchar-
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            ged it ſelf into L, and carried in as much Water, as is
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            then neceſſary, after which by turning the Cock I a-
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            gain, you may let new cold Water out of S into D the
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            leſſer Boiler as before: </s>
            <s xml:id="echoid-s1782" xml:space="preserve">and thus will there be a con-
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            ſtant motion, and a continual ſupply of the Engine,
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            without fear of Decay or diſorder.</s>
            <s xml:id="echoid-s1783" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1784" xml:space="preserve">Alſo to know whether L want repleniſhing or not,
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            you need only turn the Cock N, and if Water come
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            out, there is no need to repleniſh; </s>
            <s xml:id="echoid-s1785" xml:space="preserve">but if Steam only
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            come, you may conclude, there is. </s>
            <s xml:id="echoid-s1786" xml:space="preserve">And the like will
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            the Cock G do, in reference to the leſſer Boyler D,
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            ſhewing when tis neceſſary to ſypply that with freſh
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            water from S, ſo that in working the Engine there is
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            very little Skill or labour required, it being only to
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            be injured by either a ſtupid, or wilful neglect of </s>
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