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="55" file="0065" n="65" rhead="DE MACHINA HYDRAVL. LONDINENSI."/>
            or 3 Inches above, and the other, ſo far below the
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            ſurface of the water therein, when it is of a due
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            height; </s>
            <s xml:id="echoid-s1234" xml:space="preserve">theſe are, to find the exceſſ or defect of wa-
              <lb/>
            ter in the Boiler, it being of a due height, when ſte-
              <lb/>
            am is emitted by the ſhorter, and water by the
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            longeſt Pipe.</s>
            <s xml:id="echoid-s1235" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1236" xml:space="preserve">H. </s>
            <s xml:id="echoid-s1237" xml:space="preserve">A Pipe fix'd to the Head of the Boiler, and
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            called the Buoy-Pipe, open at both Ends, the lower
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            End being a foot or more below the ſurface of the
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            water, in the Boiler, in which is a cylindrical Buoy,
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            that ſwims upon the water therein, and when the
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            Steam in the Boiler is become ſo ſtrong, as by its
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            Preſſure to force the water up into the ſaid Pipe, it
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            then raiſes the Buoy, whoſe Shanck 12 cauſes the Bal-
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            lance R and Inceptor 7, alſo to riſe, and lifting
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            the notch 2 from 3 on the End of the Leaver oo
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            ,
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            Permits No. </s>
            <s xml:id="echoid-s1238" xml:space="preserve">13 a wight hanging thereto, to fall ſo far,
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            till thereby the injecting Cock at N (the axis of the
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            ſaid Leaver) is opened, by which a Injection of cold
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            water being made, and conſequently a vacuum (by
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            the condenſation of the Steam procured) the preſſure
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            of the atmoſphere on the Piſton brings down b (the
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            inner end of the great Leaver) when on of the three
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            Pins in the hanging Beam Q, that comes down with
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            the great Leaver, takes hold of n. </s>
            <s xml:id="echoid-s1239" xml:space="preserve">1. </s>
            <s xml:id="echoid-s1240" xml:space="preserve">one End of the
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            Leaver oo, which by the fall of the wigt. </s>
            <s xml:id="echoid-s1241" xml:space="preserve">13 at the
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            other End, was raiſed, as above, ſomewhat heigher
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            than the Parallel of its axis at N, and brings it down
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            ſo far till the End 3 is raiſed up high enough to be
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            again taken hold of by the notch 2, at which Time the
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            injecting-Cock is thereby ſhut, and the Regulator E
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            opened, as deſcribed under the letter Q.</s>
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