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

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            Neſpole à riſtringerla di nuouo tanto che ſi poteſſe ve-
              <lb/>
            dere.</s>
            <s xml:id="echoid-s3526" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3527" xml:space="preserve">_Mat_. </s>
            <s xml:id="echoid-s3528" xml:space="preserve">Hora di queſta ſorte è l’acqua contenuta nella palla C,
              <lb/>
            dicend o eſſi _nella pag. </s>
            <s xml:id="echoid-s3529" xml:space="preserve">200. </s>
            <s xml:id="echoid-s3530" xml:space="preserve">ſeguitando però à tene’ ſempre im-_
              <lb/>
            _merſa la palla C, nel ghiaccio, per trattener l’acqua d eſſa in inſta-_
              <lb/>
            _to di maſsimo ristrengimento_. </s>
            <s xml:id="echoid-s3531" xml:space="preserve">Se è riſtretta maſſimamente,
              <lb/>
            conſideri Signor Ofredi qual forza ſaria neceſſario ado-
              <lb/>
            prare per riſtringerla tanto che ſi vedeſſe.</s>
            <s xml:id="echoid-s3532" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3533" xml:space="preserve">In oltre, è certiſſimo che la natura procura d’ottenere ſem-
              <lb/>
            pre il ſuo fine con li mezzi più facili. </s>
            <s xml:id="echoid-s3534" xml:space="preserve">Se vna veſcica gon-
              <lb/>
            fia d’aria ſi ponerà ſopra queſto pauimento, e ſopra ſe li
              <lb/>
            ponerà qualche notabil peſo, queſto la riſtringerà qual-
              <lb/>
            che poco; </s>
            <s xml:id="echoid-s3535" xml:space="preserve">ma ſe prima foſſe veſtita, e circondata con ſpun-
              <lb/>
            ga, bambace, e ſimili corpi riſtrettibili, il peſo riſtringereb-
              <lb/>
            be prima queſti, e l’aria della veſcica ò nulla, ò aſſai meno
              <lb/>
            di prima.</s>
            <s xml:id="echoid-s3536" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3537" xml:space="preserve">_Ofr_. </s>
            <s xml:id="echoid-s3538" xml:space="preserve">In ciò non hò dubio alcuno.</s>
            <s xml:id="echoid-s3539" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3540" xml:space="preserve">_Mat_. </s>
            <s xml:id="echoid-s3541" xml:space="preserve">Nel noſtro caſo adunque, quello che deue comprimer @-
              <lb/>
            acqua della palla C, è l’aria del ſifone DAE, ſpinta dalla
              <lb/>
            rarefattione dell’acqua della palla B; </s>
            <s xml:id="echoid-s3542" xml:space="preserve">la quale aria ſe bene
              <lb/>
            per lo ſtrofinamento del ghiaccio è più condenſata di
              <lb/>
            quello che ſarebbe naturalmente, nulladimeno non è ri-
              <lb/>
            ftretta quanto puole. </s>
            <s xml:id="echoid-s3543" xml:space="preserve">Prima adunque di premere ſopra
              <lb/>
            l’acqua C, ſi riſtringerà
              <unsure/>
            eſſa di molto. </s>
            <s xml:id="echoid-s3544" xml:space="preserve">Onde non premerà
              <lb/>
            ſopra l’acqua C, con tutta quella forza, con la quale pre-
              <lb/>
            merebbe quando non patiſce ſimil condenſatione.</s>
            <s xml:id="echoid-s3545" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3546" xml:space="preserve">_Ofr_. </s>
            <s xml:id="echoid-s3547" xml:space="preserve">Preme però molto, mentre eſſi auuertiſcono, che eſſen-
              <lb/>
            do la palla C, di Criſtallo, l’hà fatta crepare, & </s>
            <s xml:id="echoid-s3548" xml:space="preserve">eſſendo di
              <lb/>
            rame, hà fatto crepare il ſifone.</s>
            <s xml:id="echoid-s3549" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s3550" xml:space="preserve">_Mat_. </s>
            <s xml:id="echoid-s3551" xml:space="preserve">Tanto credo. </s>
            <s xml:id="echoid-s3552" xml:space="preserve">La ſeconda eſperienza è molto bella;</s>
            <s xml:id="echoid-s3553" xml:space="preserve">e mi
              <lb/>
            rimetto al giuditio, che eſſi ne formano. </s>
            <s xml:id="echoid-s3554" xml:space="preserve">Sopra la terza ſi
              <lb/>
            può fare qualche conſideratione. </s>
            <s xml:id="echoid-s3555" xml:space="preserve">Fecero gettare vna
              <lb/>
            gran palla d’argento, ma aſſaiſottile, della quale habbia-
              <lb/>
            mo parlato di ſopra à carte 12. </s>
            <s xml:id="echoid-s3556" xml:space="preserve">e riempitola d’acqua
              <lb/>
            molto raffreddata con il ghiaccio, la ſerrorno ſaldiſſima-
              <lb/>
            mente con vite; </s>
            <s xml:id="echoid-s3557" xml:space="preserve">poi principiorno à martellarla in più luo-
              <lb/>
            ghi, & </s>
            <s xml:id="echoid-s3558" xml:space="preserve">ammaccarla. </s>
            <s xml:id="echoid-s3559" xml:space="preserve">Dicono che _ad ogni colpo ſi vedeua tra-_
              <lb/>
            _ſudare per li pori del metallo_. </s>
            <s xml:id="echoid-s3560" xml:space="preserve">Il che, dicono, non ſarebbe </s>
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