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

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          <p>
            <s xml:id="echoid-s4732" xml:space="preserve">
              <pb o="65" file="00159" n="159" rhead="_QVARTO_."/>
            di 6. </s>
            <s xml:id="echoid-s4733" xml:space="preserve">braccia, & </s>
            <s xml:id="echoid-s4734" xml:space="preserve">vna d’vno, e ſe li ponghi vna pallina, come
              <lb/>
            nell’e ſperienza del Sig. </s>
            <s xml:id="echoid-s4735" xml:space="preserve">Rinaldini regiſtrata, _nel pr. </s>
            <s xml:id="echoid-s4736" xml:space="preserve">Dial. </s>
            <s xml:id="echoid-s4737" xml:space="preserve">no-_
              <lb/>
            _ſtro pag. </s>
            <s xml:id="echoid-s4738" xml:space="preserve">27_. </s>
            <s xml:id="echoid-s4739" xml:space="preserve">e notiſi il tempo che aſcenderà il primo brac-
              <lb/>
            cio in quella di 6. </s>
            <s xml:id="echoid-s4740" xml:space="preserve">& </s>
            <s xml:id="echoid-s4741" xml:space="preserve">il braccio in quella di vno; </s>
            <s xml:id="echoid-s4742" xml:space="preserve">poiche que-
              <lb/>
            ſti tempi credo che ſarãno ritrouati vguali. </s>
            <s xml:id="echoid-s4743" xml:space="preserve">E la ragione lo
              <lb/>
            perſuade. </s>
            <s xml:id="echoid-s4744" xml:space="preserve">Perche nelli moti all’ingiù il medemo ſpatio è
              <lb/>
            paſſato dal principio del moto più alto, e più baſſo che ſia
              <lb/>
            il mobile, nel medemo tempo. </s>
            <s xml:id="echoid-s4745" xml:space="preserve">Adunque pare che coſi
              <lb/>
            anco doueſſe ſuccedere nell’eſtruſione. </s>
            <s xml:id="echoid-s4746" xml:space="preserve">Principij a muo-
              <lb/>
            uerſi la pietra dalla cima della torre, ò dal mezzo, ſcorrerà
              <lb/>
            il primo braccio nel medemo tempo. </s>
            <s xml:id="echoid-s4747" xml:space="preserve">E ſi potrebbe fare
              <lb/>
            queſt’eſperienza. </s>
            <s xml:id="echoid-s4748" xml:space="preserve">Nella canna di 6. </s>
            <s xml:id="echoid-s4749" xml:space="preserve">braccia ſi ſommerga
              <lb/>
            vna pallina di piombo tenuta con qualche inſtrumento vn
              <lb/>
            poco ſotto acqua, ſi che con dilatare ſolo, ò aprire quell’-
              <lb/>
            inſtrumento la pallina ſubito diſcendeſſe, e ſi noti il tempo,
              <lb/>
            che conſumerà a paſſar vn braccio; </s>
            <s xml:id="echoid-s4750" xml:space="preserve">poi tenuta come ſopra
              <lb/>
            ſe ponghi ſotto acqua per 5. </s>
            <s xml:id="echoid-s4751" xml:space="preserve">braccia, e ſe la ſci diſcender pu-
              <lb/>
            re per vn braccio, e ſi noti il tempo medemamente. </s>
            <s xml:id="echoid-s4752" xml:space="preserve">Io cre-
              <lb/>
            do certo che queſti due tempi ſaranno vguali. </s>
            <s xml:id="echoid-s4753" xml:space="preserve">Coſi adun-
              <lb/>
            que nell’eſtruſione io credo che li medemi ſpatii ſijno paſ-
              <lb/>
            ſati in tempi vguali da qual ſi voglia luogo principii l’ eſ-
              <lb/>
            truſione.</s>
            <s xml:id="echoid-s4754" xml:space="preserve"/>
          </p>
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            <s xml:id="echoid-s4755" xml:space="preserve">_Ofr_. </s>
            <s xml:id="echoid-s4756" xml:space="preserve">Ma io direi in contrario. </s>
            <s xml:id="echoid-s4757" xml:space="preserve">Quanto più l’acqua è alta, tanto
              <lb/>
            più preme. </s>
            <s xml:id="echoid-s4758" xml:space="preserve">L’eſperienza la vediamo nella botte piena, che
              <lb/>
            quanto più fondo ſi fora, con tanto maggior empito eſce
              <lb/>
            il vino, perche ne ha ſopra maggior quantità premente.
              <lb/>
            </s>
            <s xml:id="echoid-s4759" xml:space="preserve">Così nel noſtro caſo, quanto più alto è il cilindro d’ac-
              <lb/>
            qua ſopra il galleggiante, tanto più preme per cac-
              <lb/>
            ciarlo.</s>
            <s xml:id="echoid-s4760" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4761" xml:space="preserve">_Mat_. </s>
            <s xml:id="echoid-s4762" xml:space="preserve">L’eſempio non mi par a propoſito; </s>
            <s xml:id="echoid-s4763" xml:space="preserve">perche nella botte,
              <lb/>
            dalla parte dalla quale eſce il vino non vi è coſa, che pre-
              <lb/>
            mi contro eſſo atta ad impedire l’vſcita; </s>
            <s xml:id="echoid-s4764" xml:space="preserve">perche ſe bene
              <lb/>
            contraſta l’aria, & </s>
            <s xml:id="echoid-s4765" xml:space="preserve">impediſce l’empito del vino in
              <lb/>
            qualche parte, il quale vſcirebbe con maggior velocìtà, ſe
              <lb/>
            ò non foſſe l’aria, ò foſſe più leggiera, e meno premente,
              <lb/>
            nulladimeno non può impedire totalmente l’vſcita. </s>
            <s xml:id="echoid-s4766" xml:space="preserve">Ma
              <lb/>
            ſopra il galleggiante preme altr’acqua, come habbiamo
              <lb/>
            detto _nel cit. </s>
            <s xml:id="echoid-s4767" xml:space="preserve">Dial. </s>
            <s xml:id="echoid-s4768" xml:space="preserve">pag_. </s>
            <s xml:id="echoid-s4769" xml:space="preserve">14. </s>
            <s xml:id="echoid-s4770" xml:space="preserve">E perciò queſta equilibrando </s>
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