Alberti, Leone Battista, De re aedificatoria, 1485

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    <archimedes>
      <text>
        <body>
          <chap id="N40001A">
            <p id="N404096" type="main">
              <s id="N4040EF">
                <pb xlink:href="004/01/095.jpg"/>
              fateri oporteat arcum ipſum cuneorum pluſculorum compactio
                <lb/>
              ne conſtare: Quorum alii capitibus infirmis ad arcum ipſum ſub
                <lb/>
              ſideant: alii ad dorſum inſidentes nodum ſpinæ obtineant: Aliquando
                <lb/>
              reliquum expleant ambitum coſtarum. </s>
              <s id="N404102">Non ſit ab re eadem repe
                <lb/>
              tere: quæ primo in libro recenſuimus. </s>
              <s id="N404107">Arcus inter ſe differunt:
                <lb/>
              Nam eſt quidem rectus / quem integer ſemicirculus conſtituit:
                <lb/>
              huius corda per circuli centrum dirigitur. </s>
              <s id="N40410E">Eſt et qui trabis natu
                <lb/>
              ram magis
                <expan abbr="q̈">quam</expan>
              arcus ſapiat: hunc
                <expan abbr="cõminutum">comminutum</expan>
              dicimus / quod ſit non
                <lb/>
              integer ſemicirculus: ſed ſit eius quota aliqua pars: huius corda
                <lb/>
              a centro diſtat et ſupra eſt. </s>
              <s id="N40411F">Eſt et copoſitus arcus: quem undem
                <lb/>
              aliquando angularem / alii actum dicunt: qui ex arcubus duobus commi
                <lb/>
              nutis componitur: habetque ſua in corda duo duarum flexarum ſe
                <lb/>
              ſe mutuo ſecantium linearum centra. </s>
              <s id="N404128">Rectum arcum omnium
                <lb/>
              eſſe firmiſſimum cum re ipſa cenſet: tum et ratione argumentoque
                <lb/>
              monſtratur. </s>
              <s id="N40412F">Et diſſolui quidem ſponte quo poſſit pacto non ui
                <lb/>
              deo: ni cuneorum alter alterum extrudat: ab qua quidem iniu
                <lb/>
              ria tam longe abſunt: ut etiam alter alterius ope confirmetur:
                <lb/>
              Quin etiam ubi forte id moliri aggrediantur / ponderum natura
                <lb/>
              quibus aut ſubſiſtunt / aut imbuti ipſi ſunt cunei / uetantur. </s>
              <s id="N40413A">Hinc
                <lb/>
              illud Varronis / quod ait in arcuatis operibus dextra non magis
                <lb/>
              ſtare ex ſiniſtris / quod ſiniſtra ex dextris. </s>
              <s id="N404141">Et ſpectare licet rem: Su
                <lb/>
              premus quidem cuneus / qui ad ſpinam mediam unicus ſit / quo
                <lb/>
              nam modo erit ualidus cuneos propellere collaterales: aut illis
                <lb/>
              ipſis
                <expan abbr="premẽtibus">prementibus</expan>
              quando poterit is quidem ex ſede iam occupata
                <lb/>
              protrudi? </s>
              <s id="N404152">Qui uero proximi per coſtas
                <expan abbr="ſuccedũt">ſuccedunt</expan>
              cunei
                <expan abbr="libramẽtis">libramen
                  <lb/>
                tis</expan>
              ponderum facile in officio continentur. </s>
              <s id="N40415F">Demum et alterutra
                <lb/>
              ad capita qui ſubſideant cunei / quid erit cur moueantur ſuperio
                <lb/>
              ribus in officio perſiſtentibus. </s>
              <s id="N404166">Ergo rectis arcubus / qui ſeſe facile
                <lb/>
              tueantur cordam non exigimus: in
                <expan abbr="cõminutis">comminutis</expan>
              autem ferream ca
                <lb/>
              tenam / aut quod cordæ uim obtineat / parietum extenſionibus hinc
                <lb/>
              atque hinc confirmamus: haſque eſſe extenſiones optamus non
                <expan abbr="breuiores/q̈">bre
                  <lb/>
                uiores / quam</expan>
              quibus comminutus / qui deeſt ambitus queat integrari:
                <lb/>
              Quod ipſum facere ueteres architecti
                <expan abbr="nunquã">nunquam</expan>
              neglexere: et com
                <lb/>
              minutos omnes arcus ubi id licuit / nunquam non intra parietum </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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