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

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          <p>
            <s xml:id="echoid-s5284" xml:space="preserve">
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            ſchizziata, & </s>
            <s xml:id="echoid-s5285" xml:space="preserve">irregolare.</s>
            <s xml:id="echoid-s5286" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5287" xml:space="preserve">_Cont._ </s>
            <s xml:id="echoid-s5288" xml:space="preserve">Mi marauiglio molto di queſte eſperienze; </s>
            <s xml:id="echoid-s5289" xml:space="preserve">le quali mē-
              <lb/>
            tre V. </s>
            <s xml:id="echoid-s5290" xml:space="preserve">S. </s>
            <s xml:id="echoid-s5291" xml:space="preserve">èandato narrando, io hò letto li titoli d’alcune
              <lb/>
            propoſitioni del Sig. </s>
            <s xml:id="echoid-s5292" xml:space="preserve">Borelli. </s>
            <s xml:id="echoid-s5293" xml:space="preserve">Nella 73. </s>
            <s xml:id="echoid-s5294" xml:space="preserve">dice. </s>
            <s xml:id="echoid-s5295" xml:space="preserve">_Poſito quod flui_-
              <lb/>
            _dum violenter ſurſum exprimatur a fluido ambiente grauiori, di_-
              <lb/>
            _uerſœque conſiſtentiœ, infima aſcendentis ſuperficies explanata,_
              <lb/>
            _vel concaua erit._</s>
            <s xml:id="echoid-s5296" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5297" xml:space="preserve">_Mat._ </s>
            <s xml:id="echoid-s5298" xml:space="preserve">Io mai l’ho veduta ne nell’aria, ne nell’olio concaua; </s>
            <s xml:id="echoid-s5299" xml:space="preserve">be-
              <lb/>
            ne nell’aria, nelli cilindri d’eſſa molto notabili mi ha parſo
              <lb/>
            piana, di modo però che più toſto appariua qualche con-
              <lb/>
            ueſſità, che cauità. </s>
            <s xml:id="echoid-s5300" xml:space="preserve">La qual conueſſità era molto oſſerua-
              <lb/>
            bile nelli globetti d’eſſa, e la conſeruaua anco in alcuni at-
              <lb/>
            taccati alla baſe della maggiore, come già hò detto, ben-
              <lb/>
            che aſcendeſſero con eſſa. </s>
            <s xml:id="echoid-s5301" xml:space="preserve">Queſta conueſſità pordalla par-
              <lb/>
            teinferiore era molto notabile, come pure hò detto, in
              <lb/>
            quell’aria, che in quantità non così poca aſcendeua raden-
              <lb/>
            do il lato del tubo non perpendicolare, ma ſolo inclinato
              <lb/>
            all’orizonte. </s>
            <s xml:id="echoid-s5302" xml:space="preserve">Nell’olio poi queſta conueſſità dalla parte in-
              <lb/>
            feriore è frequentiſſima.</s>
            <s xml:id="echoid-s5303" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5304" xml:space="preserve">_Cont._ </s>
            <s xml:id="echoid-s5305" xml:space="preserve">Se cosìè, haurà, in virtù delle propoſitioni di queſto Si-
              <lb/>
            gnore, ragione il P. </s>
            <s xml:id="echoid-s5306" xml:space="preserve">Riccioli di credere, che I’olio in par-
              <lb/>
            ticolare aſcendi per leggierezza poſitiua, ſoggiungendo
              <lb/>
            pur egli _la prop. </s>
            <s xml:id="echoid-s5307" xml:space="preserve">74. </s>
            <s xml:id="echoid-s5308" xml:space="preserve">Si fluidum ſpontè à virtute intrinſeca intra_
              <lb/>
            _aliud fluidum diuerſœ conſiſtentiœ moueatur in parte poſteriori, ſeu_
              <lb/>
            _termino à quo, ſui motus, non erit excauatum ſed tumidam; </s>
            <s xml:id="echoid-s5309" xml:space="preserve">& </s>
            <s xml:id="echoid-s5310" xml:space="preserve">con_-
              <lb/>
            _uexam figuram acquiret._</s>
            <s xml:id="echoid-s5311" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5312" xml:space="preserve">_Mat._ </s>
            <s xml:id="echoid-s5313" xml:space="preserve">Coſa poſſi inferire il P. </s>
            <s xml:id="echoid-s5314" xml:space="preserve">Riccioli dalle propoſitioni del
              <lb/>
            Signor Borelli io non lo voglio ricercare. </s>
            <s xml:id="echoid-s5315" xml:space="preserve">Sò bene che io
              <lb/>
            hò fatto quelle eſperienze, e che non per queſto tengo che
              <lb/>
            l’olio, & </s>
            <s xml:id="echoid-s5316" xml:space="preserve">aria aſcendino per l’acqua per leggerezza poſiti-
              <lb/>
            ua, ma ſolo per eſtruſione.</s>
            <s xml:id="echoid-s5317" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5318" xml:space="preserve">_Ofr._ </s>
            <s xml:id="echoid-s5319" xml:space="preserve">In gratia V. </s>
            <s xml:id="echoid-s5320" xml:space="preserve">Sig. </s>
            <s xml:id="echoid-s5321" xml:space="preserve">habb vn poco di patienza, che io con
              <lb/>
            queſta carafa cilindrica voglio fare queſt eſperienze in
              <lb/>
            qualche modo. </s>
            <s xml:id="echoid-s5322" xml:space="preserve">Ecco che riempitela d’acqua, & </s>
            <s xml:id="echoid-s5323" xml:space="preserve">otturan-
              <lb/>
            dola con il pollice, ralentando vn poco l’otturamento ſi
              <lb/>
            vedono aſcēdere velociſſimamēte alcune palline, ò sferet-
              <lb/>
            te d’aria. </s>
            <s xml:id="echoid-s5324" xml:space="preserve">Anzi che alcune di queſte aſcene ſino al fondo del-
              <lb/>
            la carafa conſeruano la cu@uità viſibile nella parte </s>
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