Angeli, Stefano degli, Della gravita' dell' aria e fluidi : esercitata principalmente nelli loro homogenei

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          <p>
            <s xml:id="echoid-s5156" xml:space="preserve">
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            ſtamente diſcender l’acqua all’intorno.</s>
            <s xml:id="echoid-s5157" xml:space="preserve"/>
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          <figure number="33">
            <image file="00171-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/9EXVCG1R/figures/00171-01"/>
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          <p>
            <s xml:id="echoid-s5158" xml:space="preserve">Et hauendo tentato queſt’eſperienza più vol-
              <lb/>
            te voltando, eriuoltando il tubo, accade-
              <lb/>
            ua alle volte che non tutta l’aria aſcende-
              <lb/>
            ua vnita, & </s>
            <s xml:id="echoid-s5159" xml:space="preserve">in vna ſol volta; </s>
            <s xml:id="echoid-s5160" xml:space="preserve">ma ò ne ri-
              <lb/>
            maneſſe qualche poca attaccata alla veſci-
              <lb/>
            ca; </s>
            <s xml:id="echoid-s5161" xml:space="preserve">ò penetraſſe per la legatura; </s>
            <s xml:id="echoid-s5162" xml:space="preserve">ò foſſero
              <lb/>
            efluuii della medema acqua eccitati dal
              <lb/>
            calor delle mani; </s>
            <s xml:id="echoid-s5163" xml:space="preserve">ò che che altro ne foſſe,
              <lb/>
            e principiaſſe queſta a ſalire in tempo che
              <lb/>
            la prima foſſe ſalita molto ad alto, anco
              <lb/>
            paſſata la metà; </s>
            <s xml:id="echoid-s5164" xml:space="preserve">nulladimeno queſta ſe-
              <lb/>
            conda occupando nel tubo ſpatio molt’-
              <lb/>
            anguſto, aſcendeua con gran velocità;
              <lb/>
            </s>
            <s xml:id="echoid-s5165" xml:space="preserve">non formando la predetta figura, ma co-
              <lb/>
            me vna perletta, ò pallina lucida, la quale
              <lb/>
            arriuata all’altra ò ſi confondeua con eſſa; </s>
            <s xml:id="echoid-s5166" xml:space="preserve">
              <lb/>
            ò le ſi attaccaua alla baſe A C, di modo che ſe diſtingueua,
              <lb/>
            ritenendo dalla parte inferiore la ſua conueſſità.</s>
            <s xml:id="echoid-s5167" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5168" xml:space="preserve">Oſſeruino però che circa queſta figura faitigiata dell’ aria
              <lb/>
            A B C, la refrattione cagionata dalla craſſitie del vetro, e
              <lb/>
            la poſitura dell’occhio ne hà vna gran parte circa il più e
              <lb/>
            meno. </s>
            <s xml:id="echoid-s5169" xml:space="preserve">Poiche collocato l’occhio di ſotto al detto cilindro
              <lb/>
            d’aria, hò veduto la faſtigiatione B, molto eminente; </s>
            <s xml:id="echoid-s5170" xml:space="preserve">collo-
              <lb/>
            cato al liuello con la cima B, l’ho veduta minore; </s>
            <s xml:id="echoid-s5171" xml:space="preserve">ma col-
              <lb/>
            locato di ſopra non vedeuo alcuna conueſſità.</s>
            <s xml:id="echoid-s5172" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5173" xml:space="preserve">Ho poi preſo vn’altro tubo non in altro differente dall’ an-
              <lb/>
            tecedente SX, ſe non che era più ſottile, e non era tutto
              <lb/>
            largo vgualmente, ma di ſopra dell’S V, terminaua in vna
              <lb/>
            mazzocca aſſai capace come vn sferoide, ouero Ouo; </s>
            <s xml:id="echoid-s5174" xml:space="preserve">e
              <lb/>
            fatte tutte le coſe come nel precedente, hò oſſeruato che
              <lb/>
            ſino che l’acqua aſcendeua per la parte S X, del tubo, ne ſe-
              <lb/>
            guiua il medemo come nell’antecedente; </s>
            <s xml:id="echoid-s5175" xml:space="preserve">ma arriuata alla
              <lb/>
            parte più larga, non riteneua quella figura curua, e conoi-
              <lb/>
            dale, ma facendoſi in vna falda larga, e ſchizza come vna
              <lb/>
            fogatia, con gran preſtezza aſcendeua il rimanente. </s>
            <s xml:id="echoid-s5176" xml:space="preserve">Eciò
              <lb/>
            tanto ſuccedeua, ò ſaliſce dal più ſtretto nel più largo, ò da
              <lb/>
            queſto in quello.</s>
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