Vitruvius Pollio, I dieci libri dell?architettura, 1567

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    <archimedes>
      <text>
        <body>
          <chap>
            <subchap1>
              <subchap2>
                <p type="main">
                  <s id="s.001150">
                    <pb pagenum="55" xlink:href="045/01/063.jpg"/>
                    <emph type="italics"/>
                  le qualità de i uenti. </s>
                  <s id="s.001151">Da queſto precetto, Vitruuio ſi piglia una bella occaſione di filoſofa­
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                  re d'intorno la natura, & qualità de i uenti, & però dicendo prima, che coſa è uento, co
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                  mincia a queſto modo.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.001152">Il uento è onda del mare, che ſcorre con incerta abbondanza di mouimento: egli na
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                  ſce quando il caldo ritroua il ſreddo, & lo impeto del feruore eſprime la forza dello ſpi
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                  rito che ſoffia: & queſto ſi dimoſtra eſſer uero dalle palle dette Eolopile: & con gli ar­
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                  tificioſi ritrouamenti delle coſe ſi tragge dalle ſecrete ragioni del cielo quanto è uero
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                  della diuinità. </s>
                  <s id="s.001153">Fannoſi le dette palle cauate di rame con un punto ſtrettiſsimo per lo­
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                  quale ſi ui mette dentro l'acqua, & ſi poneno al fuoco. </s>
                  <s id="s.001154">& prima che ſiano calde non
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                  mandano fuori alcun ſiato, ma poi che cominciano a bollire, fanno al fuoco una gran
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                  forza di ſpignere, & di ſoffiare. </s>
                </p>
                <p type="main">
                  <s id="s.001155">
                    <emph type="italics"/>
                  Diffiniſce Vitruuio il uento, & moſtra da che naſce, & proua il naſcimento con coſe ſen­
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                  ſibili. </s>
                  <s id="s.001156">Dice adunque il uento eſſer onda del mare: ſi come l'onda non è altro, che una parte
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                  d'acqua unita, & raccolta, che uerſo alcuna parte cacciata inſieme ſi muoue: coſi uuole
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                  Vitruuio, che il uento ſia parte dello aere in ſe riſtretta, che in alcuna parte pieghi, & però ha
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                  detto, che'l uento è onda del aere, che con incerto & sforzeuole mouimento ſi commoue. </s>
                  <s id="s.001157">Naſce
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                  il uento (come dice Vitr.) quando il calore s'incontra con l'humore, & per lo feruore ſi man­
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                  da fuori la forza dello ſpirito, che ſoffia. </s>
                  <s id="s.001158">ſe bene Vitruuio ci da lo eſſempio per prouare, che
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                  il uento naſce dal calore, che opera nella humidità: non però eſpone chiaramente lo effetto. </s>
                  <s id="s.001159">
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                  Diremo adunque noi quello, che da noſtri precettori hauemo imparato. </s>
                  <s id="s.001160">Il uento, è uapore del
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                  la terra, che aſcende all'altezza dello aere, & ſcacciato dal freddo, che in quella parte ſi
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                  truoua, percuote lo aere con uiolenza. </s>
                  <s id="s.001161">il calore del Sole, & d'altri corpi celesti ha uirtù di
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                  trarre dalla terra alcuni fumi o uapori, & leuarli in alto, perche la proprietà del calore,
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                  è tirare a ſe: il che ſi fa ſcaldando, & facendo i corpi piu rari. </s>
                  <s id="s.001162">Queſti uapori ſono alcune
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                  parti ſottili dell'humore terreſire, che non hanno nè calore, nè figura determinata, hanno al
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                  cuni calore, & humidità: alcuni calore, & ſiccità. </s>
                  <s id="s.001163">de i primi ſi genera ogni humida impreſsio­
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                  ſione, come le nubi, la pioua, la rugiada, la neue, la grandine, la brina, le fonti, il mare. </s>
                  <s id="s.001164">de
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                  i ſecondi ſi fa ogni infiammato, & acceſo ardore, & tutto quello, che è di calda, & ſeccá
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                  natura, & però i fuochi, i lampi, i tizzoni, le comete, le caſe ardenti, le ſtelle cadenti, le
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                  corone luminoſe, i fulmini, le uoragini, & apriture dello aere eſtiuo, i uenti, i turbini, & al
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                  tre apparenze d'imperfette miſture da quelli hanno origine, come da materie loro proportio­
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                  nate. </s>
                  <s id="s.001165">Noi diremo de i uenti. </s>
                  <s id="s.001166">Il Sole adunque ha uirtu di tirar al modo che detto hauemo quel
                    <lb/>
                  uapore che è caldo, & ſecco, & ſi chiama eſaltatione, come il primo caldo, & humido, ſi
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                  dice uapore; Queſti adunque uſcito dalla terra, per eſſer di natura di fuoco s'inalza, & ſi
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                  lieua dritto all'in ſu, & aſcende fin che egli ritruoua la parte di mezo dello aere, & che è fred
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                  da per eſſer diſtante, & dal riſalimento de i raggi del Sole, che dalla terra ſi fa, & dal fer­
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                  uore dello elemento del fuoco. </s>
                  <s id="s.001167">ritrouando adunque il freddo, come nimico lo fugge, & hauen­
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                  do pure natura di fuoco cerca di aſcendere: ma eſſendo ribattuto dal freddo, è forza, che di­
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                  ſcenda, & per queſto contraſto è ſcacciato da i lati, & in giro ſi muoue per la uiolenza fat­
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                  tagli dal freddo, che lo ribatte in giu, & per la naturale inclinatione, che lo porta in ſu, pre
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                  dominando il fuoco in eſſo. </s>
                  <s id="s.001168">& però il uento non è altro che calda, & ſecca eſalatione moſſa
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                  da i lati, d'intorno la terra, per la ribattuta del freddo, che è nella mezana parte dello ae­
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                  re. </s>
                  <s id="s.001169">& ſe bene alcuna fiata chiamamo uento lo aere moſſo, come ſi uede dal ſoffiar de i folli, o
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                  dal farſi uento la ſtate, o dalle palle ſopradette, che Elopile ſi chiamano, quaſi palle uentoſe,
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                  non è però, che il uento ſia mouimento dello aere, perche bene puo ſtare, che lo aere ſi muo­
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                  ua con il uento, & il uento però non ſia onda dello aere. </s>
                  <s id="s.001170">La ragione del ſoffiar delle Eolopile,
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                  è perche il fuoco opera nell'acqua col ſuo calore, & cerca di conuertirla in aere, & perche le di
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                  menſioni dello aere ſono maggiori delle dimenſioni dell'acqua, per eſſere lo aere piu raro, però
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
      </text>
    </archimedes>
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