Vitruvius Pollio, I dieci libri dell?architettura, 1567

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    <archimedes>
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            <subchap1>
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                <pb pagenum="149" xlink:href="045/01/157.jpg"/>
                <p type="main">
                  <s id="s.003062">
                    <emph type="italics"/>
                  La baſa Ionica ſi forma a queſto modo. </s>
                  <s id="s.003063">ſia la larghezza ſua per ogni uerſo tanto, quanto è la
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                  groſſezza della colonna, & di piu tanto quanto è un quarto, & un'ottauo della detta groſſez­
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                  za, cioè ſe diuiderai il diametro della colonna in ſedici parti, ſia tanto allungato, che ne hab­
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                  bia uentidue: et queſta ſia la larghezza della baſa. </s>
                  <s id="s.003064">l'altezza è per la metà della groſſezza della co
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                  lonna. </s>
                  <s id="s.003065">L'orlo è la terza parte dell' altezza. </s>
                  <s id="s.003066">il reſtante ſi diuide in ſette parti, tre delle quali ſi danno
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                  al baſtone di ſopra, due ſi danno al cauetto con il ſuo tondino, & ſopraciglio, & due al cauetto di
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                  ſotto con il ſuo ſopraeiglio. </s>
                  <s id="s.003067">i tondini ſi fanno per l'ottaua parte del cauetto. </s>
                  <s id="s.003068">Ma ben parerà, che'l
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                  cauetto di ſotto ſia maggiore, percioche egli ſporterà fin allo eſtremo dell'orlo. </s>
                  <s id="s.003069">Lo ſporto di ſo­
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                  pra, oltra la groſſezza della colonna ſi fa a queſto modo. </s>
                  <s id="s.003070">piglia tre parti della diuiſione del dia­
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                  metro, che ſono la ottaua, & ſeſta decima parte, & quelle diuiderai per mezo, & tanto ſarà lo
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                  ſporto, cioè d'una parte et meza, dalla deſtra, & dalla ſiniſtra; et tanto è lo ſporto della ſpira,
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                  doue ſi fa la cimbia con le ragioni dette di ſopra. </s>
                  <s id="s.003071">l'altezza della cimbia è per un terzo dell' al­
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                  tezza del baſtone, il centro del quale è ſopra la linea, che diſcende dallo ſporto della cimbia. </s>
                  <s id="s.003072">
                    <lb/>
                  i tondini deono eſſer toccati da una linea, che ſi parte dallo eſtremo ſopraciglio, allo eſtremo
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                  del liſtello, che è ſopra l'orlo, et ſotto il cauetto inferiore. </s>
                  <s id="s.003073">i cauetti ſi fanno al modo ſopra
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                  detto. </s>
                  <s id="s.003074">et queſta è la deſcrittione della baſa Ionica. </s>
                  <s id="s.003075">l'altezza della colonna in diuerſe maniere di
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                  fabriche, è diuerſa. </s>
                  <s id="s.003076">I ſuoi raſtrenamenti ſono regolati da Vitr. ſecondo le altezze ſue, però ſi di
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                  ra del capitello.
                    <emph.end type="italics"/>
                  </s>
                </p>
                <p type="main">
                  <s id="s.003077">
                    <emph type="italics"/>
                  Tira una linea che ſia tanto lunga quanto è groſſa la colonna da piedi. </s>
                  <s id="s.003078">Queſta diuiderai in
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                  parti dieciotto, et ne aggiungnerai una di eſſe, ſi che ſarà in tutto parti diecinoue. </s>
                  <s id="s.003079">hora tutta
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                  queſta ſarà la lunghezza, et larghezza del capitello. </s>
                  <s id="s.003080">Ma l'altezza con le uolute ſarà per la
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                  metà, cioè parti noue, et mezo: dico con le uolute, perche la groſſezza del capitello, è un ter
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                  zo della groſſezza delle colonne, et le uolute ſono ornamenti, et non parti del capitello, & uan
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                  no piu in giu del capitello. </s>
                  <s id="s.003081">Manderai dunqne a baſſo de gli eſtremi di queſta linea i catheti. </s>
                  <s id="s.003082">
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                  cioè linee a piombo, tanto lunghe, quanto ſono le noue parti et meza, cioè la metà della lun­
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                  ghezza. </s>
                  <s id="s.003083">queſte linee ci ſeruiranno poi. </s>
                  <s id="s.003084">reſtino però ſegnate le noue parti et meza, ma ſcancel
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                  lati i primi ſegni delle diui ſioni della linea della lunghezza, et larghezza del capitello: perche
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                  ſi deue diuiderla in uenti parti, et
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                  retirarſi in entro dalle eſtremità della linea detta, una parte,
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                  et un quarto delle uenti, et mandar giu de gli altri catheti di pani alli primi. </s>
                  <s id="s.003085">con le iſteſſe diuiſio
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                  ni, in queſte linee ritirate ſarà il centro dell' occhio, ſi fermeranno le uolute, et ſi regolerà tut
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                  to il reſtante del capitello. </s>
                  <s id="s.003086">Leone chiama l'occhio della uoluta ciclo. </s>
                  <s id="s.003087">la uoluta è uno inuoglio ad
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                  imitatione delli cincinni de i capelli muliebri, i uolgari la chiamano cartoccio. </s>
                  <s id="s.003088">Delle noue parti
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                  di queſte linee ſe ne danno all' orlo, o abaco una, & meza, l'una è per la gola dello abaco,
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                  che è fatto in forma della lettera S. ma tirata con gratia, & la meza ſi da al ſuo liſtello. </s>
                  <s id="s.003089">le uo
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                  lute ſi formano a queſto modo. </s>
                  <s id="s.003090">restando ſotto l'abaco parti otto, ſi fa un punto la doue termina­
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                  no le quattro & meza, & ſopra quello poſto un piede della ſesta, ſi fa un giro, il cui diametro
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                  tiene una di quelle parti, & tre ne reſtano di ſotto, & quattro di ſopra. </s>
                  <s id="s.003091">queſto cerchio o giro è
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                  l'occhio delle uolute, nel quale hanno ad eſſere dodici centri, che formano le uolute a ſeſta, nè
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                  poſſono eſſer meno, perche fariano la uoluta sgarbata, & con pochi giri, & non ſalua la lettera
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                  di Vitruuio. </s>
                  <s id="s.003092">Io non dirò de gli inuentori di questo modo per non metter molti huomini da bene al
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                  le mani. </s>
                  <s id="s.003093">io confeſſo d'hauerla imparata, & ne tengo obligo alli maeſtri. </s>
                  <s id="s.003094">Iſeppo Saluiati pitto­
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                  re eccellente, me ne dedicò uno trattatello, & lo fece ſtampare. </s>
                  <s id="s.003095">ſe quelli, i quali me l'hanno
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                  dimoſtrata prima, l'habbiano pigliata dal Saluiati, io non lo sò. </s>
                  <s id="s.003096">per formare adunque la uoluta
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                  biſogna mandare a baſſo una linea per banda egualmente diſtante alla linea, ſopra laquale è il
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                  centro dell'occhio, diſtante da quella, quel quarto, che nol dicemmo, che era d'una parte, &
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                  un quarto, perche queſta linea poi che haueremo tirato il diametro dell' occhio caderà a punto ſo
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                  pra il ditto diametro, & ci darà la regola di formare un quadro nell'occhio, ſopra le cui diagona­
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                  li ſaranno i dodici centri predetti: per che quanto ſarà dal taglio, che fa queſta linea ſopra il
                    <emph.end type="italics"/>
                  </s>
                </p>
              </subchap2>
            </subchap1>
          </chap>
        </body>
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    </archimedes>
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