Alberti, Leone Battista, De re aedificatoria, 1485

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      <text>
        <body>
          <chap id="N40001A">
            <p id="N409E2D" type="main">
              <s id="N409FAE">
                <pb xlink:href="004/01/215.jpg"/>
              anulo columnæ calcem obambit / ſi ita licet / nextrum appel
                <lb/>
              lemus. </s>
              <s id="N409FBB">Anulum autem in
                <expan abbr="ſũmo">ſummo</expan>
              præter nextrum qui ueluti
                <lb/>
              funiculus aduolutus ſupremum ſcapi ambitum adſtringit /
                <lb/>
              torquem appellemus. </s>
              <s id="N409FC6">Demum finitor linea comparabitur
                <lb/>
              ſic:
                <expan abbr="nãque">nanque</expan>
              in pauimento quidem aut coæquato aliquo in pari
                <lb/>
              ete quem locum picturam nuncupo recta inſcribitur linea
                <lb/>
              longa æque atque futura eſt columna: quam ex rupe fabri ex
                <lb/>
              ſecturi ſint: hæc linea axis dicitur. </s>
              <s id="N409FD5">Axim ergo diuidemus
                <lb/>
              certas in partes prout futuri operis ratio et columnarum ua
                <lb/>
              rietas / de qua ſuo dicetur loco poſtulabit: ad quarum partium
                <lb/>
              modum fiet imæ plantæ diameter:
                <expan abbr="quã">quam</expan>
              iſtic in pictura
                <expan abbr="trãſ">tranſ</expan>
                <lb/>
              uerſa lineola ad pares utrumque angulos infimo in axis capi
                <lb/>
              te perſcribimus. </s>
              <s id="N409FEA">Hanc diametrum
                <expan abbr="ĩ">in</expan>
              partes diuidimus qua
                <lb/>
              tuor et uiginti. </s>
              <s id="N409FF3">Partium unam damus altitudini nextruli:
                <lb/>
              quam quidem altitudinem iſtic in pictura deſcribimus li
                <lb/>
              nea puſilla. </s>
              <s id="N409FFC">Rurſus ex quattuor et uiginti particulis plan
                <lb/>
              tæ capimus tris: ad iſtamque altitudinem
                <expan abbr="ĩ">in</expan>
              axi ponimus cen
                <lb/>
              trum proximæ retractionis. </s>
              <s id="N40A007">Per hocque centrum lineam du
                <lb/>
              cimus ad pares angulos æquidiſtantem plantæ. </s>
              <s id="N40A00C">Iſtæc igitur
                <lb/>
              linea erit diameter imæ retractionis: cuius longitudo fiet
                <lb/>
              breuior
                <expan abbr="q̈">quam</expan>
              ſit ipſa diameter plantæ ex illius ſeptima. </s>
              <s id="N40A01B">Signa
                <lb/>
              tis his duabus lineis / hoc eſt diametro
                <expan abbr="retractiõis">retractionis</expan>
              et nextro
                <lb/>
              a capite nextri ſoluto ad caput retractionis ducimus
                <expan abbr="lineã">lineam</expan>
                <lb/>
              inflexam dorſo uerſus axem flexione
                <expan abbr="q̈">quam</expan>
              id fieri poterit mol
                <lb/>
              li atque gratiſſima. </s>
              <s id="N40A033">Eius iſtius flexionis initium quart
                <expan abbr="ã">am</expan>
              ha
                <lb/>
              bebit circuli puſilli: cuius cicli ſemidiameter ſit nextri al
                <lb/>
              titudo. </s>
              <s id="N40A042">Poſt id totam axis longitudinem in partes diuidi
                <lb/>
              mus æquales ſeptem. </s>
              <s id="N40A047">et eas diuiſiones
                <expan abbr="pũctis">punctis</expan>
              annotauimus.
                <lb/>
              </s>
              <s id="N40A051">Quarto igitur in puncto a planta numerare incipiens con
                <lb/>
              ſtituam centrum uentris: per quod ſuam ducas diametrum:
                <lb/>
              cuius longitudo æqualis ſit diametro imæ retractionis. </s>
              <s id="N40A05A">
                <expan abbr="Sũma">Sum
                  <lb/>
                ma</expan>
                <expan abbr="deĩceps">deinceps</expan>
              retractio et proiectura conſtituentur ſic. </s>
              <s id="N40A066">Nam
                <lb/>
              pro columnæ magnitudine de qua ſuo loco rationabimur /
                <lb/>
              ſummi circuli diameter ex diametro ima plantae dedu</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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