Caverni, Raffaello, Storia del metodo sperimentale in Italia, 1891-1900

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              <s>
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              CAPITOLO V.
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              </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
                <emph type="bold"/>
              Del suono
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              </s>
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            <p type="main">
              <s>
                <emph type="center"/>
              SOMMARIO
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              </s>
            </p>
            <p type="main">
              <s>I. </s>
              <s>Della diffusione del suono per l'aria. </s>
              <s>— II. </s>
              <s>Delle varie esperienze ordinate a dimostrar la diffu­
                <lb/>
              sione, e a misurar la velocità del suono per l'aria. </s>
              <s>— III. </s>
              <s>Delle prime fisiche ragioni date delle
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              consonanze. </s>
              <s>— IV. </s>
              <s>Di ciò che intorno al risonar delle corde fu dimostrato da Galileo. </s>
              <s>— V. </s>
              <s>Di
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              un Trattato fisico matematico, che preparava Niccolò Aggiunti sui tremori armonici nelle corde. </s>
            </p>
            <p type="main">
              <s>
                <emph type="center"/>
              I.
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              </s>
            </p>
            <p type="main">
              <s>Alla luce e al calore aggiunsero i Pitagorici l'armonia a intreare quei
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              vivifici influssi, che piovon su noi dall'alto delle sfere celesti. </s>
              <s>Ma perchè
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              quell'armonia, insensibile all'ottusità del nostro udito, non si faceva consi­
                <lb/>
              stere in altro che in un bell'ordine di numeri, si vede qui pure verificarsi
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              la legge storica altre volte da noi avvertita, ed è che la matematica precedè
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              la fisica anche nel filosofare intorno alla natura e alla proprietà de'suoni. </s>
              <s>
                <lb/>
              Le dottrine pitagoriche però e le platoniche son come fior di bellezza, che
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              aprendo leggero all'aria il suo seno, col progredir del tempo allegando in
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              frutto, convien che anch'egli si pieghi a terra trattovi dal proprio peso. </s>
              <s>Quel
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              tornar così a soggiacere alle passioni comuni a tutti gli altri corpi, signifi­
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              cava, traducendo il simbolo a senso proprio, il passar dalle matematiche con­
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              templazioni alle fisiche realtà, che facevano le antiche dottrine; passaggio che
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              avvenne per opera della Filosofia stoica succeduta, propriamente come frutto
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              maturato, al fiore della Filosofia pitagorica. </s>
            </p>
            <p type="main">
              <s>Agli Stoici si deve l'avere avvertita quella somiglianza che passa fra
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              gl'increspamenti dell'aria alle vibrazioni del corpo risonante, e i cerchi che
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              si diffondono intorno a un sasso gittato sulla superficie di un'acqua tran-</s>
            </p>
          </chap>
        </body>
      </text>
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