Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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          <head xml:id="echoid-head30" xml:space="preserve">XVII.</head>
          <p>
            <s xml:id="echoid-s651" xml:space="preserve">Apertis templi valvis ſonus tubæ hoc modo efficitur.</s>
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            <image file="0036-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0036-01"/>
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            <s xml:id="echoid-s653" xml:space="preserve">Sit poſt valvas vas A B C D aquam habens, in quo ſit ſuffocarium,
              <lb/>
            hoc eſt vas ſyſtomum inverſum F, quippe@cujus os ſenſim contrahitur: </s>
            <s xml:id="echoid-s654" xml:space="preserve">ejus
              <lb/>
            fundo perforato aptetur tuba habens & </s>
            <s xml:id="echoid-s655" xml:space="preserve">codona, & </s>
            <s xml:id="echoid-s656" xml:space="preserve">lingulam : </s>
            <s xml:id="echoid-s657" xml:space="preserve">canali
              <lb/>
            autem tubæ apponatur regula L M, coagmentata ſuffocatorio, cana-
              <lb/>
            lique tubæ alligata: </s>
            <s xml:id="echoid-s658" xml:space="preserve">& </s>
            <s xml:id="echoid-s659" xml:space="preserve">in extremitate ejus habens columation Z, hoc
              <lb/>
            eſt chelonarion, cuiſubjiciatur regula N X, ſuſtinens ſuffocatorium F,
              <lb/>
            tantum ab aqua diſtans, quantum ſatis ſit: </s>
            <s xml:id="echoid-s660" xml:space="preserve">& </s>
            <s xml:id="echoid-s661" xml:space="preserve">regula N X circa fibulam
              <lb/>
            O moveatur: </s>
            <s xml:id="echoid-s662" xml:space="preserve">in extremitate autem regulæ X catena, vel funis alligata
              <lb/>
            referatur per orbiculum P ad partem valvarum poſteriorem: </s>
            <s xml:id="echoid-s663" xml:space="preserve">continget
              <lb/>
            igitur valvis apertis extentum funem trahere extremitatem regulæ Y: </s>
            <s xml:id="echoid-s664" xml:space="preserve">ita
              <lb/>
            ut regula N X non amplius colymatio Z ſubjiciatur: </s>
            <s xml:id="echoid-s665" xml:space="preserve">hoc autem per-
              <lb/>
            mutato ſuffocatorium in aquam delatum tubæ ſonum efficiet, propter-
              <lb/>
            ea quod aër, qui eſt in ipſo per lingulam, & </s>
            <s xml:id="echoid-s666" xml:space="preserve">codona extruditur.</s>
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