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

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            <s xml:id="echoid-s3501" xml:space="preserve">
              <pb o="27" file="00121" n="121" rhead="TERZO."/>
            ta; </s>
            <s xml:id="echoid-s3502" xml:space="preserve">e stretta. </s>
            <s xml:id="echoid-s3503" xml:space="preserve">Sigillato ch ei ſarà, ſi caui di ſotto ’l ghiaccio la pal-
              <lb/>
            la B, e temper at ala prima nell’ acqua tiepida, ſi tuffi nella calda, e
              <lb/>
            da vltimo nella bollente, ſeguitando pero a tener ſempre immerfa
              <lb/>
            la palla C, nelghiaccio, per trattener l’acqua di eſſa in iſtato di
              <lb/>
            maſsimo ristrignimento. </s>
            <s xml:id="echoid-s3504" xml:space="preserve">Sia queſto nel punto E, oltre il quale cer-
              <lb/>
            cherà di comprimerla il cilindro d’aria GE ridotto all eftrema den-
              <lb/>
            ſita dalla forza dell’acqua ſormontata in G, per la rarefattione o-
              <lb/>
            perata in lei da lcalor dell’ acqua, che ſi ſuppone bollire attualme-
              <lb/>
            mente intorno allapalla B. </s>
            <s xml:id="echoid-s3505" xml:space="preserve">Ora ſe l’acqua patiſce compreſsione
              <lb/>
            dourà cedere di qualcbe grado al cilindro d’aria premente, abbaſ-
              <lb/>
            ſandoſi ſotto il punto E; </s>
            <s xml:id="echoid-s3506" xml:space="preserve">Ma a noi è ſucceduto al@rimenti, perche
              <lb/>
            quand@ l’acqua in E, è stala veramente ridotta allo ſtato del ſu@
              <lb/>
            maſsimo riſtrignimento, la forza dell aria GE, premente non à gua-
              <lb/>
            dagnato nulla, e innanzi à fatto crepar’il fondo della palla C, che’
              <lb/>
            ritirare vn pelo il liuello E. </s>
            <s xml:id="echoid-s3507" xml:space="preserve">E quando, per a@@reſcer maggior fer-
              <lb/>
            mezza allo ſtrumento, abbiamo fatte le due palle di rame, nondime-
              <lb/>
            no l’acqua della palla C, à retto trà la ſaldezza del metallo, e l mo-
              <lb/>
            mento della forza premente con inſuperabile reſ@tenza in E, fa-
              <lb/>
            cendo più to ſto ſcoppiare il ſifone, &</s>
            <s xml:id="echoid-s3508" xml:space="preserve">c.</s>
            <s xml:id="echoid-s3509" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3510" xml:space="preserve">_Mat_. </s>
            <s xml:id="echoid-s3511" xml:space="preserve">Deue ſapere Sig. </s>
            <s xml:id="echoid-s3512" xml:space="preserve">Ofredi, che quelli corpi, li quali mani-
              <lb/>
            feſtamehte ſoggiacciono alla compreſſione, quale è l’aria
              <lb/>
            noſtra, non ci laſciano veder creſcer queſta con quell’in-
              <lb/>
            cremento, che creſce la forza premente. </s>
            <s xml:id="echoid-s3513" xml:space="preserve">Pei eſempio,
              <lb/>
            premendoſi l’aria, che riempie vn vaſo con 4. </s>
            <s xml:id="echoid-s3514" xml:space="preserve">gradi di for-
              <lb/>
            za, ſiriſiringa in ſpazio vn decimo minore del primo, fe
              <lb/>
            premeraſſi con gradi 8. </s>
            <s xml:id="echoid-s3515" xml:space="preserve">di forza, non ſi riſtringerà già in
              <lb/>
            ſpatio minore del primo due decirni, ma meno; </s>
            <s xml:id="echoid-s3516" xml:space="preserve">e cio ſem-
              <lb/>
            pre tanto meno, quanto più ſarà condenſata. </s>
            <s xml:id="echoid-s3517" xml:space="preserve">Sì che
              <lb/>
            ſe con 100. </s>
            <s xml:id="echoid-s3518" xml:space="preserve">gradi di forza foſſe già riſtretta quattro deci-
              <lb/>
            mi, può eſſere che con 400. </s>
            <s xml:id="echoid-s3519" xml:space="preserve">non ſiriſtringa vn altro de-
              <lb/>
            cimo.</s>
            <s xml:id="echoid-s3520" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3521" xml:space="preserve">_Ofr_. </s>
            <s xml:id="echoid-s3522" xml:space="preserve">Queſta dottrina l hò per certiſſima; </s>
            <s xml:id="echoid-s3523" xml:space="preserve">hauendo oſſeruato
              <lb/>
            quando ſi gioca al pallone, che riempito, e gonfio che ſia
              <lb/>
            competentemente, ſe bene queſto ſi dilata ſempre più
              <lb/>
            per ogni ſchizzetatta, nulladimeno a farcene entrare vna
              <lb/>
            di nuouo vi vuole vna grādiſſima forza, & </s>
            <s xml:id="echoid-s3524" xml:space="preserve">a pena ſe può ot-
              <lb/>
            tener l’in tento. </s>
            <s xml:id="echoid-s3525" xml:space="preserve">Onde ſe l’acqua (al noſtro propoſito) foſſe
              <lb/>
            per altro accidente riſtrettiſſima, vi vorrebbono altro </s>
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