Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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            <pb pagenum="240" xlink:href="010/01/248.jpg"/>
            <p type="main">
              <s id="s.001236">
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                <lb/>
              cùm imminet aliqua diuturna, & continuata pluuia
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              in illa regione, tunc mercurius in fiſtula per aliquos
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              gradus ſupra conſuetam altitudinem eleuatur, è con­
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              trà pluuia iam actu cadente mercurius in prædicta fi­
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              ſtula deprimi ſolet, nec eſt exigua prædicta differen­
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              tia, multotiès enim Piſis obſeruaui in diuturnis plu­
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              uioſis tempeſtatibus variaſſe mercurij altitudinem̨
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              per duodecim gradus, ſcilicèt per latitudinem vnius
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              pollicis. </s>
              <s id="s.001237">Quia verò aſſeruo penès me exemplar epi­
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              ſtolæ, quam Sereniſſimo Principi Leopoldo modò
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              Cardinali ampliſſimo anno 1657. ſcripſi circa hanc
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              materiam, hìc afferam breuiter ea, quæ tunc ſpecu­
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              latus ſum, quod nimirùm fieri poteſt ob aeris preſ­
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              ſionem ſupra mercurium ſtagnantem in fiſtula, vt an­
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              te pluuiam aer multò magis grauitet, & comprimat,
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              quam in ipſo pluuiæ deſcenſu, quod vt clariùs oſten­
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              dam, præmittendum eſt. </s>
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            <p type="margin">
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              Cap. 5. de ae­
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              ris grauitate
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              æquilibrio,
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              ſtructura, &
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              vi elaterią
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              eius.</s>
            </p>
            <p type="main">
              <s id="s.001239">
                <emph type="center"/>
              PROP. CXIV.
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            <p type="main">
              <s id="s.001240">
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              In fiſtula Torricelliana intra puteum demerſa ſi aqua
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              à grauiori ſuper addito fluido occupetur, mercu­
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              rius in fistula altiùs ſubleuatur, at post
                <lb/>
              illius delapſum denuo mercurius
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              deprimitur.
                <emph.end type="italics"/>
                <emph.end type="center"/>
              </s>
            </p>
            <p type="main">
              <s id="s.001241">SVmpta fiſtula vitrea ABC flexa in B, & facto iņ
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              ea vacuo, more ſolito, mercurius eleuetur vſque
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              ad F, demittatur poſtea fiſtula intra vas vitreum cy­
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              lindricum DE maximę altitudinis earum quæ exca-</s>
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          </chap>
        </body>
      </text>
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