Alberti, Leone Battista, De re aedificatoria, 1485

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    <archimedes>
      <text>
        <body>
          <chap id="N40001A">
            <p id="N400C14" type="main">
              <s id="N400CFC">
                <pb xlink:href="004/01/020.jpg"/>
              cætera generis eiuſdem: de quibus ſuo loco diſtinctius loquemur
                <lb/>
              Aliud enim foro / aliud theatro / aliud paleſtræ / aliud templo ſpa
                <lb/>
              tii locorumque debetur. </s>
              <s id="N400D21">Itaque pro cuiuſque ratione et uſu habendus
                <lb/>
              areæ ſitus erit & modus. </s>
              <s id="N400D26">Verum hoc loco ut generatim iſta / uti
                <lb/>
              cepimus / proſequamur / ea tantum attingemus: quæ fore neceſſa
                <lb/>
              ria arbitramur / Si prius de lineis aliqua retulero / quæ ad rem
                <expan abbr="cõmode">com
                  <lb/>
                mode</expan>
              exprimendam faciant. </s>
              <s id="N400D33">Nam de areæ deſcriptione tractanti
                <lb/>
              bus conuenit ut de his tranſigamus / quibus ipſa perſcriptio anno
                <lb/>
              tatur. </s>
              <s id="N400D3A">Omnis igitur perſcriptio lineis fit & angulis / Lineæ qui
                <lb/>
              dem ſunt extrema perſcriptio / qua integræ areæ ſpatium circun
                <lb/>
              cluditur. </s>
              <s id="N400D41">
                <expan abbr="Hãc">Hanc</expan>
              uero ad perſcriptionem pars illa ſuperficiei ſubſti
                <lb/>
              tuta / quæ intra duas mutuo ſe ſe intercidentes lineas continetur /
                <lb/>
              angulus dicitur. </s>
              <s id="N400D4B">Atqui ex mutua quidem duarum linearum
                <expan abbr="ĩter">inter</expan>
                <lb/>
              ſectione quatuor conſcribuntur anguli: Quorum ſi erit quiſque
                <lb/>
              quibuſque trium reliquorum equalis / recti nuncupabuntur: Et qui
                <lb/>
              recto minores erunt / acuti appellabuntur: ut qui recto ampliores
                <lb/>
              obtuſi dicentur. </s>
              <s id="N400D5A">Linearum item alia recta / alia flexa / cocleas &
                <lb/>
              uerticoſas lineas hic non eſt ut referam. </s>
              <s id="N400D5F">Recta linea a puncto eſt
                <lb/>
              ad punctum ob longa perſcriptio / ducta ita ut fieri nulla poſſit
                <lb/>
              breuior. </s>
              <s id="N400D66">Flexa linea pars eſt circuli. </s>
              <s id="N400D69">Circulus eſt ea perſcriptio
                <lb/>
              facta ab altero duorum punctorum: qui in eadem ſuperficie ita
                <lb/>
              ſit circumactus / ut toto perſcriptionis ductu ſemper neque plus: ne
                <lb/>
              que diſtet minus a medio immobili / quem obambiat puncto /
                <expan abbr="q̈">quam</expan>
                <expan abbr="cũ">cum</expan>
                <lb/>
              primum circunduci occeperat. </s>
              <s id="N400D7C">Sed his addendum quod flexa line
                <lb/>
              a quam eſſe partem circuli diximus / apud nos hic architectos ſi
                <lb/>
              militudinis gratia arcus uocatur. </s>
              <s id="N400D83">Et quæ linea aduobus extremis
                <lb/>
              punctis flexæ lineæ directa ducitur pari ſimilitudine corda
                <expan abbr="nuncupabit̃">nun
                  <lb/>
                cupabitur</expan>
              . </s>
              <s id="N400D8D">Et quæ linea a puncto mediæ corde coæquabilibus
                <expan abbr="utrĩ">utris</expan>
                <lb/>
              que angulis ad arcum uſque perducta extiterit / ſagicta appellabitur
                <lb/>
              Et quæ linea a puncto
                <expan abbr="ĩmobili/qd">immobili / quod</expan>
              intra circulum eſt ad
                <expan abbr="flexã">flexam</expan>
              ean
                <lb/>
              demque
                <expan abbr="extremã">extremam</expan>
              circuli
                <expan abbr="lineã">lineam</expan>
                <expan abbr="pduceret̃/radius">perduceretur / radius</expan>
                <expan abbr="dicet̃">dicetur</expan>
              . </s>
              <s id="N400DB2">Et
                <expan abbr="pũcto">puncto</expan>
              quod
                <lb/>
              huic
                <expan abbr="ĩmobili/quod">immobili / quod</expan>
              medium intra circulum aſſidet centro nomen
                <lb/>
              erit: Et quæ linea recta
                <expan abbr="pcentrũ">per centrum</expan>
              tranſiens duobus locis
                <expan abbr="flexã">flexam</expan>
              circu
                <lb/>
              li
                <expan abbr="lineã">lineam</expan>
              ſecabit / diameter
                <expan abbr="appellabit̃">appellabitur</expan>
              . </s>
              <s id="N400DD3">Inter arcus
                <expan abbr="itẽ">item</expan>
              differentia eſt </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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