Alberti, Leon Battista, L' architettura

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          <p>
            <s xml:id="echoid-s2547" xml:space="preserve">
              <pb o="55" file="059" n="59" rhead="LIBRO SECONDO."/>
            cia, & </s>
            <s xml:id="echoid-s2548" xml:space="preserve">che nel cuocerla il fuoco non ui truoui che conſumare, come ſono i Tufi’
              <lb/>
            & </s>
            <s xml:id="echoid-s2549" xml:space="preserve">le pietre bigiccie, & </s>
            <s xml:id="echoid-s2550" xml:space="preserve">pallide, che ſono preſſo a Roma ne Fidenati, & </s>
            <s xml:id="echoid-s2551" xml:space="preserve">ne campi
              <lb/>
            Albani. </s>
            <s xml:id="echoid-s2552" xml:space="preserve">Biſogna a uolere che la calcina fia lodata da quei, che ſanno, che ella
              <lb/>
            peſi il terzo manco, di quel che ella pesò cruda. </s>
            <s xml:id="echoid-s2553" xml:space="preserve">Oltre che la pietra ancora, che
              <lb/>
            per natura è troppo ſugoſa, o troppo humida, ſi inuetria di modo al fuoco, che
              <lb/>
              <note position="left" xlink:label="note-059-01" xlink:href="note-059-01a" xml:space="preserve">5</note>
            non è utile a farne calcina. </s>
            <s xml:id="echoid-s2554" xml:space="preserve">Plinio dice che la pietra uerde, cioè il Serpentino
              <lb/>
            reſiſte al fuoco grandemẽte; </s>
            <s xml:id="echoid-s2555" xml:space="preserve">ma noi ſappiamo certo che il Porfido, non ſolo nõ
              <lb/>
            ſi cuoce per le fiamme, ma ſtando in una fornace non laſcia mai cuocere i ſaſsi,
              <lb/>
            che gli ſono intorno à baſtanza. </s>
            <s xml:id="echoid-s2556" xml:space="preserve">Nè uogliono ancora le pietre che tẽghino di
              <lb/>
            terra, perche la calcina poi non rieſce ſtietta. </s>
            <s xml:id="echoid-s2557" xml:space="preserve">Ma gli Architettori antichi lo-
              <lb/>
              <note position="left" xlink:label="note-059-02" xlink:href="note-059-02a" xml:space="preserve">10</note>
            dano grandemente la calcina, che ſi fa di pietra molto dura, & </s>
            <s xml:id="echoid-s2558" xml:space="preserve">molto ſerrata, & </s>
            <s xml:id="echoid-s2559" xml:space="preserve">
              <lb/>
            maſsimo bianca, & </s>
            <s xml:id="echoid-s2560" xml:space="preserve">penſano che queſta non ſia ſcommoda, & </s>
            <s xml:id="echoid-s2561" xml:space="preserve">a tutti gli altri uſi,
              <lb/>
            & </s>
            <s xml:id="echoid-s2562" xml:space="preserve">nel fare le uolte ancora fortiſsima. </s>
            <s xml:id="echoid-s2563" xml:space="preserve">Nel ſecõdo luogo lodano quella calcina
              <lb/>
            che ſi fa di pietra leggieri in uero, o atta a putrefarſi, ma ſpungnoſa, & </s>
            <s xml:id="echoid-s2564" xml:space="preserve">penſano
              <lb/>
            che queſta per lo intonicare ſia la migliore, & </s>
            <s xml:id="echoid-s2565" xml:space="preserve">piu trattabile delle altre, & </s>
            <s xml:id="echoid-s2566" xml:space="preserve">che rẽ
              <lb/>
              <note position="left" xlink:label="note-059-03" xlink:href="note-059-03a" xml:space="preserve">15</note>
            da le opere piu ſplendide. </s>
            <s xml:id="echoid-s2567" xml:space="preserve">Et io ho ueduto in Francia che gli Architettori
              <lb/>
            nõ hanno uſata altra calcina, che quella che ſi fa di frombole (raccolte de fiumi)
              <lb/>
            nericcie, & </s>
            <s xml:id="echoid-s2568" xml:space="preserve">molte dure, che tu direſti, che fuſſero ſelici. </s>
            <s xml:id="echoid-s2569" xml:space="preserve">Et niente dimeno egli
              <lb/>
            è certo che ella sì nelle opere di pietra, sì in quelle di mattoni, ha mantenuto
              <lb/>
            gran tempo eccellente fermezza. </s>
            <s xml:id="echoid-s2570" xml:space="preserve">Io truouo appreſſo di Plinio, che la calcina
              <lb/>
              <note position="left" xlink:label="note-059-04" xlink:href="note-059-04a" xml:space="preserve">20</note>
            che ſi fa delle pietre da fare macini, è molto cõmoda ad ogni coſa, ma io ho uiſto
              <lb/>
            per eſperienza, che di quella pietra da Macine, che pare che ſia machiata di goc
              <lb/>
            ciole di ſale, per eſſere piu rozza, & </s>
            <s xml:id="echoid-s2571" xml:space="preserve">in oltre piu arida, nõ ne ſuccede queſto; </s>
            <s xml:id="echoid-s2572" xml:space="preserve">ma
              <lb/>
            di quella, che nõ è macchiata di ſale, ch’è piu ſerrata, & </s>
            <s xml:id="echoid-s2573" xml:space="preserve">che quando ſi lauora cõ
              <lb/>
            ferro fa la poluere piu ſottile, ne ſuccede beniſsimo. </s>
            <s xml:id="echoid-s2574" xml:space="preserve">Hor ſia la pietra, come ſi
              <lb/>
              <note position="left" xlink:label="note-059-05" xlink:href="note-059-05a" xml:space="preserve">25</note>
            uoglia, la di caua ſarà molto piu utile per fare calcina, che quella, che ſi racco-
              <lb/>
            glie; </s>
            <s xml:id="echoid-s2575" xml:space="preserve">& </s>
            <s xml:id="echoid-s2576" xml:space="preserve">migliore ſarà quella, che ſi cauerà di caua ombroſa, & </s>
            <s xml:id="echoid-s2577" xml:space="preserve">humida, che quella
              <lb/>
            che ſi cauerà di una che ſia arida; </s>
            <s xml:id="echoid-s2578" xml:space="preserve">piu trattabile di pietra bianca, che di nericcia.
              <lb/>
            </s>
            <s xml:id="echoid-s2579" xml:space="preserve">In Francia preſſo alle Regioni marittime delli Edui, per careſtia di pietra fanno
              <lb/>
            la calcina di Oſtrighe, & </s>
            <s xml:id="echoid-s2580" xml:space="preserve">di cochiglie. </s>
            <s xml:id="echoid-s2581" xml:space="preserve">E' ancora una ſorte di calcina di Geſſo,
              <lb/>
              <note position="left" xlink:label="note-059-06" xlink:href="note-059-06a" xml:space="preserve">30</note>
            che ſi fa ancor’eſſo di pietre cotte, ancora che e’ dicono che & </s>
            <s xml:id="echoid-s2582" xml:space="preserve">in Cipri, & </s>
            <s xml:id="echoid-s2583" xml:space="preserve">in quel
              <lb/>
            di Tebe, il Geſſo ſi caua delle Caue, cotto dal Sole nella ſuperficie della Terra.
              <lb/>
            </s>
            <s xml:id="echoid-s2584" xml:space="preserve">Ma ogni pietra che ſe ne fa Geſſo, è differente da quella che ſe ne fa calcina: </s>
            <s xml:id="echoid-s2585" xml:space="preserve">per-
              <lb/>
            che ella è teneriſsima, & </s>
            <s xml:id="echoid-s2586" xml:space="preserve">atta a disfarſi ſtroppicciandola, eccetto che una che ſi
              <lb/>
            caua in Siria, che è duriſsima. </s>
            <s xml:id="echoid-s2587" xml:space="preserve">In queſto ancora è differente, che la pietra per
              <lb/>
              <note position="left" xlink:label="note-059-07" xlink:href="note-059-07a" xml:space="preserve">35</note>
            Geſſo non uuole piu che uenti hore, & </s>
            <s xml:id="echoid-s2588" xml:space="preserve">quella per fare calcina non uuole manco
              <lb/>
            di ſeſſanta ad eſſere cotta. </s>
            <s xml:id="echoid-s2589" xml:space="preserve">Io ho conſiderato che in Italia, ſon quattro ſorti di
              <lb/>
            Geſſ
              <unsure/>
            o, due che traſpaiono, & </s>
            <s xml:id="echoid-s2590" xml:space="preserve">due nò, di quelle che traſpaiono, l’una è ſimile alle
              <lb/>
            zolle dell’ Alume, o piu toſto dell’ Alabaſtro, & </s>
            <s xml:id="echoid-s2591" xml:space="preserve">lo chiamano cipollato, per eſſere
              <lb/>
            fatto di ſottiliſsimi ſcogli, cõgiunti l’uno ſopra l’altro. </s>
            <s xml:id="echoid-s2592" xml:space="preserve">L’altra è ancora ſcaglio
              <lb/>
              <note position="left" xlink:label="note-059-08" xlink:href="note-059-08a" xml:space="preserve">40</note>
            ſa, ma piu preſto ſi aſſomiglia a Sale nericcio, che allo allume. </s>
            <s xml:id="echoid-s2593" xml:space="preserve">Quelle ſorti,
              <lb/>
            che nõ traſpaiono, ſi aſſomigliano amendue alla creta, molto ſerrata, ma l’una è
              <lb/>
            alquãto bianchiccia, & </s>
            <s xml:id="echoid-s2594" xml:space="preserve">pallida, l’altra ha meſcolato con queſta pallidezza, colore
              <lb/>
            roſsigno, queſte ultime fon piu ſerrate, che le prime, Infra queſte ultime, </s>
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