Bianconi, Giovanni Lodovico, Due lettere di fisica al signor marchese Scipione Maffei, 1746

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            rebbeci il Barometro coll’indicarci il pe-
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            ſo dell’ atmosfera. </s>
            <s xml:id="echoid-s428" xml:space="preserve">La maggior diſſicoltà
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            conſiſte nelle irregolarità che naſcono
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            a cagione dei Venti, i quali ſpirando
              <lb/>
            movono più o meno l’ aria. </s>
            <s xml:id="echoid-s429" xml:space="preserve">Da qual-
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            che tempo in qua è vero ſi ſa, che i
              <lb/>
            venti che ſpirano o a ſeconda, o con-
              <lb/>
            tra il ſuono, accelerano o ritardano il
              <lb/>
            ſuo corſo; </s>
            <s xml:id="echoid-s430" xml:space="preserve">ma di quanto ſia queſto
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            cangiamento, neſſuno ancora ha potuto
              <lb/>
            determinare giuſtamente. </s>
            <s xml:id="echoid-s431" xml:space="preserve">Il Sig. </s>
            <s xml:id="echoid-s432" xml:space="preserve">Mariot-
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            te pretende, che il vento più veloce non
              <lb/>
            iſcorra che trentadue piedi in un ſecon-
              <lb/>
            do di tempo. </s>
            <s xml:id="echoid-s433" xml:space="preserve">Se queſto foſſe, ſcorrendo-
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            ne il ſuono mille e quaranta in circa,
              <lb/>
            parerebbe che poco diſturbo poteſſe te-
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            merſi dal vento, e tale, che non foſſe
              <lb/>
            per avventura poſſibile accorgerſene ſe
              <lb/>
            non in lunghiſſimi ſpazj. </s>
            <s xml:id="echoid-s434" xml:space="preserve">Ma le oſſerva-
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            zioni degli altri, e ſpecialmente del Der-
              <lb/>
            haam, benchè degne anch’ eſſe di </s>
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