Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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          <head xml:id="echoid-head57" xml:space="preserve">XLIII.</head>
          <p>
            <s xml:id="echoid-s1273" xml:space="preserve">Ex diftantiis voces avicularum hoc modo efficiuntur.</s>
            <s xml:id="echoid-s1274" xml:space="preserve"/>
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          <figure number="50">
            <image file="0066-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0066-01"/>
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          <p>
            <s xml:id="echoid-s1275" xml:space="preserve">Sit vas præcluſum, per quod infundibulum tranſmittitur, cujus caulis
              <lb/>
            à fundo tantum diſtet, quantum ad aquæ fluxum ſatis ſit. </s>
            <s xml:id="echoid-s1276" xml:space="preserve">Superponitur au-
              <lb/>
            tem infundibulo vas concavum in cnodacibus verſatum, habensque in in-
              <lb/>
            feriori parte pondera, in quod aqua ſemper influit. </s>
            <s xml:id="echoid-s1277" xml:space="preserve">Contingit igitur
              <lb/>
            vacuo exiſtente vaſe, quod in cnodacibus verſatur, ipſum rectum per-
              <lb/>
            manere: </s>
            <s xml:id="echoid-s1278" xml:space="preserve">pondus enim habet in fundo appoſitum. </s>
            <s xml:id="echoid-s1279" xml:space="preserve">Atque eo repleto aqua
              <lb/>
            in vas præcluſum effundetur. </s>
            <s xml:id="echoid-s1280" xml:space="preserve">Et aër qui eſt in ipſo, per quandam fiſtu-
              <lb/>
            lam expulſus ſonum reddet. </s>
            <s xml:id="echoid-s1281" xml:space="preserve">Exinanitur autem vas per quendam ſiphonem
              <lb/>
            inflexum: </s>
            <s xml:id="echoid-s1282" xml:space="preserve">& </s>
            <s xml:id="echoid-s1283" xml:space="preserve">in quo tempore exinanitio fit, rurſus vas repletum invertitur.
              <lb/>
            </s>
            <s xml:id="echoid-s1284" xml:space="preserve">Itaque oportebit influxionem haud in medium vaſis incidere, ut ipſum
              <lb/>
            repletum ſubito invertatur.</s>
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