Alberti, Leon Battista, L' architettura

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            <s xml:id="echoid-s5332" xml:space="preserve">
              <pb o="116" file="120" n="120" rhead="DELLA ARCHITETTVRA"/>
            ue il ponte. </s>
            <s xml:id="echoid-s5333" xml:space="preserve">Et ciò feciono non con il ſerrare con un ſolo Argine tutto il fiu-
              <lb/>
            me ad un tratto, ma fattone prima una parte, paſſarono a far l'altra, & </s>
            <s xml:id="echoid-s5334" xml:space="preserve">a congiu-
              <lb/>
            gnerla poi con la già fatta: </s>
            <s xml:id="echoid-s5335" xml:space="preserve">Concioſia che egli è impoſsibile rimuouere, & </s>
            <s xml:id="echoid-s5336" xml:space="preserve">ritene-
              <lb/>
            re ad un tratto tutto l'impeto de l'acque. </s>
            <s xml:id="echoid-s5337" xml:space="preserve">Debbonſi adunque mentre noi mu-
              <lb/>
            riamo ne fiumi laſciarli foce aperte, per lequali paſsi uia l'impeto de le gonfiate
              <lb/>
              <note position="left" xlink:label="note-120-01" xlink:href="note-120-01a" xml:space="preserve">5</note>
            onde. </s>
            <s xml:id="echoid-s5338" xml:space="preserve">Queſte foci ſi laſceranno aperte, o in eſſo guado, o quando piu faccia
              <lb/>
            a propoſito, faccinuiſi doccie di legname, & </s>
            <s xml:id="echoid-s5339" xml:space="preserve">Canali, che ſtieno ſolleuati in Aria,
              <lb/>
            per liquali l'acqua che ſopprabbonda, ſcorrendoui ſopra, paſsi uia. </s>
            <s xml:id="echoid-s5340" xml:space="preserve">Ma ſe la
              <lb/>
            ſpeſa ti pareſsi troppa, farai a ciaſcuna Pila una baſa ſemplice ſolamente, fatta
              <lb/>
            & </s>
            <s xml:id="echoid-s5341" xml:space="preserve">finita a guiſa di una Naue con uno Angolo in la Poppa, & </s>
            <s xml:id="echoid-s5342" xml:space="preserve">uno ne la Prua, di-
              <lb/>
              <note position="left" xlink:label="note-120-02" xlink:href="note-120-02a" xml:space="preserve">10</note>
            rizzandole a filo ſecondo il corſo de le acque, accioche l'impeto de le acque nel
              <lb/>
            diuiderſi, ſi ſcemi. </s>
            <s xml:id="echoid-s5343" xml:space="preserve">Et biſogna ricordarſi che l'onde nuocono molto piu a le Pop
              <lb/>
            pe, ch'a le Prue de le Pile. </s>
            <s xml:id="echoid-s5344" xml:space="preserve">Ilche da quefto ci ſi manifeſta, che da le Poppe de le Pi
              <lb/>
            le ui ſi aggira molto piu copia di acque, che da le Prue; </s>
            <s xml:id="echoid-s5345" xml:space="preserve">oltra che in quel luogo ſi
              <lb/>
            ueggono aggiramenti d'acque, che le ſcauano inſino nel fondo, & </s>
            <s xml:id="echoid-s5346" xml:space="preserve">le Prue ſtãno
              <lb/>
              <note position="left" xlink:label="note-120-03" xlink:href="note-120-03a" xml:space="preserve">15</note>
            ſal diſsime eſſendo rincalzate dalletto del fiume, ripieno di Rena. </s>
            <s xml:id="echoid-s5347" xml:space="preserve">Ilche eſſen
              <lb/>
            do coſi, è di neceſsità, che queſte parti per tutto l'edificio ſieno gagliardiſsime,
              <lb/>
            & </s>
            <s xml:id="echoid-s5348" xml:space="preserve">fortiſsime a reggere contro gli impeti delle acque; </s>
            <s xml:id="echoid-s5349" xml:space="preserve">ſarà dunque molto a pro-
              <lb/>
            poſito, che eſſo edificio ſia molto a fondo, & </s>
            <s xml:id="echoid-s5350" xml:space="preserve">con gran fondamenti da ogni ban-
              <lb/>
            da, & </s>
            <s xml:id="echoid-s5351" xml:space="preserve">maſsimo uerſo la Poppa, inſino a tanto, che per qual ſi uoglia accidente, an
              <lb/>
              <note position="left" xlink:label="note-120-04" xlink:href="note-120-04a" xml:space="preserve">20</note>
            dataſene una parte del fondamento, ue ne reſtino tante, che ſieno baſtanti a
              <lb/>
            reggere il peſo de le Pile. </s>
            <s xml:id="echoid-s5352" xml:space="preserve">Etinnanzi tratto giouerà grandemente, ancora che
              <lb/>
            da principio tu habbi cominciato a ſituare le Baſe ne la piu alta parte del letto
              <lb/>
            del fiume, che le acque, che ui paſſano ſopra, non ui caſchino rottamente come
              <lb/>
            in un precipitio; </s>
            <s xml:id="echoid-s5353" xml:space="preserve">ma sdrucciolino facilmente, come per un dolce pendio. </s>
            <s xml:id="echoid-s5354" xml:space="preserve">Per
              <lb/>
              <note position="left" xlink:label="note-120-05" xlink:href="note-120-05a" xml:space="preserve">25</note>
            cioche l'acqua, che cade precipitoſamente commoue il fondo, & </s>
            <s xml:id="echoid-s5355" xml:space="preserve">di quì fatta
              <lb/>
            piu torbida, porta uia le coſe ſmoſſe, & </s>
            <s xml:id="echoid-s5356" xml:space="preserve">continouamente caua ſotto tali luo-
              <lb/>
            ghi. </s>
            <s xml:id="echoid-s5357" xml:space="preserve">Faremo le Pile di Pietre lunghiſsime, & </s>
            <s xml:id="echoid-s5358" xml:space="preserve">larghiſsime, che di loro na-
              <lb/>
            tura reſiſtino a Diacci, & </s>
            <s xml:id="echoid-s5359" xml:space="preserve">che non infracidino per l'acque; </s>
            <s xml:id="echoid-s5360" xml:space="preserve">nè per altro acci-
              <lb/>
            dente facilmente ſi riſoluino, nè ſotto il peſo ſi fiacchino: </s>
            <s xml:id="echoid-s5361" xml:space="preserve">Et ſi mureranno con
              <lb/>
              <note position="left" xlink:label="note-120-06" xlink:href="note-120-06a" xml:space="preserve">30</note>
            ogni diligentia ſecondo il Regolo, il Piombino, & </s>
            <s xml:id="echoid-s5362" xml:space="preserve">l'archipenzolo, non pre-
              <lb/>
            termettendo per lo lungo alcuna collegatura, & </s>
            <s xml:id="echoid-s5363" xml:space="preserve">per il tra@@erſo con commet-
              <lb/>
            titure che ſcambieuolmente leghino l'una l'altra, laſciando da parte ogni ri-
              <lb/>
            pieno di ſaſsi minuti. </s>
            <s xml:id="echoid-s5364" xml:space="preserve">Aggiugnerannouiſi ancora molto ſpeſsi, & </s>
            <s xml:id="echoid-s5365" xml:space="preserve">perni, & </s>
            <s xml:id="echoid-s5366" xml:space="preserve">
              <lb/>
            ſpranghe di Bronzo, appiattate, & </s>
            <s xml:id="echoid-s5367" xml:space="preserve">acconce, di maniera ne luoghi loro, che le
              <lb/>
              <note position="left" xlink:label="note-120-07" xlink:href="note-120-07a" xml:space="preserve">35</note>
            Pietre per eſſe buche non diuentino deboli; </s>
            <s xml:id="echoid-s5368" xml:space="preserve">ma con sì fatte ſprangature ſtieno
              <lb/>
            ferme. </s>
            <s xml:id="echoid-s5369" xml:space="preserve">Et tirifi tale operain alto con amendue le teſte eleuate angularmen-
              <lb/>
            te, & </s>
            <s xml:id="echoid-s5370" xml:space="preserve">da Prua, & </s>
            <s xml:id="echoid-s5371" xml:space="preserve">da Poppa; </s>
            <s xml:id="echoid-s5372" xml:space="preserve">di maniera che le fronti de le Pile, ſoprauanzino
              <lb/>
            ſempre le piene maggiori. </s>
            <s xml:id="echoid-s5373" xml:space="preserve">Sia la groſſezza de le Pile, per la quarta parte de
              <lb/>
            l'altezza del Ponte. </s>
            <s xml:id="echoid-s5374" xml:space="preserve">Et ſono ftati alcuni che non hanno terminate le poppe,
              <lb/>
              <note position="left" xlink:label="note-120-08" xlink:href="note-120-08a" xml:space="preserve">40</note>
            & </s>
            <s xml:id="echoid-s5375" xml:space="preserve">le Prue di coſi fatte Pile con angoli; </s>
            <s xml:id="echoid-s5376" xml:space="preserve">ma con un mezo cerchio, credo io, per
              <lb/>
            conto de la uenuſtà di tale lineamento. </s>
            <s xml:id="echoid-s5377" xml:space="preserve">Et ancorche io habbia detto che il cer-
              <lb/>
            chio habbia forza di angolo, 10 appruouo piu toſto in queſto luogo gli ango-
              <lb/>
            li; </s>
            <s xml:id="echoid-s5378" xml:space="preserve">purche e' non ſieno tanto appuntati, che ſpuntati da ogni piccola </s>
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