Heron Alexandrinus, Spiritali di Herone Alessandrino

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb/>
            <p type="head">
              <s>Del Sifone torto.</s>
              <s> I.
                <lb/>
              </s>
            </p>
            <p type="main">
              <s>
                <emph type="sup"/>
              1
                <emph.end type="sup"/>
                <emph type="italics"/>
              Sia il ſifone torto, cioè il canale ABC, la cui gamba AB ſia nel va-
                <lb/>
              ſo DE pieno d'acqua; e la ſuperficie dell'acqua ſia fino alla linea dirit-
                <lb/>
              ta FG, e la gamba AB del ſifone torto ſi empia d'acqua a dirittura di
                <lb/>
              FG, cioè la parte di eſſo poſta tra la AH: ma la parte HBC ſia piena
                <lb/>
              d'aria.</s>
              <s> Se dunque dalla parte C del ſifone tiraremo l'aria che vi è den-
                <lb/>
              tro con la bocca, ſe ne verrà l'acqua ancora dopo lei, percioche come già
                <lb/>
              prima hauemo detto, non può eſſere vn luogo al tutto vacuo; e ſe fia la
                <lb/>
              bocca del ſifone nella parte C dirimpetto adeſſo FG, il ſifone benche em-
                <lb/>
              pito d'acqua non per queſto
                <emph.end type="italics"/>
                <figure number="2"/>
                <lb/>
                <emph type="italics"/>
              correrà; ma ſtaraſſi così pie_
                <lb/>
              no, a tale che la parte di lui
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              ABC ſerà piena d'acqua,
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              benche in alto ſi leui contra
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              la natura ſua; e così a gui-
                <lb/>
              ſa d'vna bilancia c'habbi li
                <lb/>
              ſuoi peſi eguali, l'acqua ſta-
                <lb/>
              rà ferma, alzata in quanto
                <lb/>
              alla parte HB, & all'ingiù
                <lb/>
              ſoſpeſa in quanto all'altra
                <lb/>
              BC.</s>
              <s> Ma ſe la bocca poi di
                <lb/>
              fuori del ſifone fuſſe ſotto la
                <lb/>
              linea diritta FG, come ſa-
                <lb/>
              rebbe a dire in K, l'acqua
                <lb/>
              ſenza dubbio all'hora ſi ver_
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              ſarabbe, perche la parte che
                <lb/>
              ſi troua in KB, eſſendo più
                <lb/>
              grave di quella che è in BH
                <lb/>
              s'inſignoriſce, e tira, & a
                <lb/>
              punto ſi verſa fin tanto, che
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              la bocca K ſia poſta in piano
                <lb/>
              con la ſuperficie dell'acqua;
                <lb/>
              e da quello in poi, più non ſi
                <lb/>
              verſerà
                <expan abbr="q;">que</expan>
              l'iſteſſa cagione.</s>
              <s>
                <emph.end type="italics"/>
                <lb/>
              </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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