Lorini, Buonaiuto , Le fortificationi, old version (312 p.), 1609

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    <archimedes>
      <text>
        <body>
          <chap>
            <pb xlink:href="031/01/018.jpg" pagenum="6"/>
            <p type="main">
              <s>E per il terzo, & vltimo TSC, con l'angolo retto S, eſſen­
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              do CT, la diagonale del quadro, ſi compartira la SC, in due par­
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              ti, cioè in D, & traſportando la DC, in TV, ad angolo retto ſo­
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              pra la baſe ST, co'l tirare la DV, ſi verrà a formare il quadro lun­
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              go DV, TS, eguale al triangolo TSC, per eſter ſimilmente egua
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              li i due triangoli AR. </s>
            </p>
            <figure id="id.031.01.018.1.jpg" xlink:href="031/01/018/1.jpg" number="28"/>
            <p type="main">
              <s>Ci reſta per vltimo a moſtrare, come ſi formino in quattro
                <lb/>
              modi gli ouati, cioè co'triangoli, & co' quadrangoli, & cir­
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              coli. </s>
              <s>E prima formiſi ſopra la baſe AB, i due triangoli di
                <lb/>
              lati eguali, cioè ABD, & ABC, douendoſi fare il C, cen
                <lb/>
              tro per tirare la parte del circolo EG, & ſimilmente D, per
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              tirare la FH, & BA, per le teſte HE, & GF. </s>
            </p>
            <figure id="id.031.01.018.2.jpg" xlink:href="031/01/018/2.jpg" number="29"/>
            <p type="main">
              <s>Segue i due quadri RS, da formare il propoſto ouato,
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              cioè per la parte della circonferenza PQ, ſi farà il cen­
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              tro L, & ſimilmente per la NOM, & per le teſte PO,
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              & QN, RS. </s>
            </p>
            <figure id="id.031.01.018.3.jpg" xlink:href="031/01/018/3.jpg" number="30"/>
            <p type="main">
              <s>Et poi il terzo con i tre circoli per la circonferenza FI,
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              il centro ſarà C, & per la HLD, le teſte LI, FH, vengo­
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              no fatte da gli ſteſſi circoli. </s>
            </p>
            <figure id="id.031.01.018.4.jpg" xlink:href="031/01/018/4.jpg" number="31"/>
            <p type="main">
              <s>Si potrà formare il propoſto ouato ſemplicemente, con
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              vna corda doppia, ſenza alcuna delle dette oſſeruationi de'
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              circoli, o delli angoli, cioè
                <expan abbr="cōpartiſcaſi">compartiſcaſi</expan>
              ſopra vn piano la lun­
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              ghezza, che ſegli vorrà dare, per eſſempio ſarà DC, in or­
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              to parti, delle quali ſe piglierà ſei, che ſaranno le AB, la­
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              ſciandone da ciaſcuna delle ſue teſte, vna, cioè AC, BD,
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              doue ſi ficcheranno i due cauicchi, o chiodi, AB, a quali ſi
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              auolgerà doppiamente vna corda ſottile, ouero ſpago ben
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              legato alle ſue teſte, ſi che venga così doppio, lungo lo ſpa­
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              tio AD, cioè di parti ſette, pigliandoſi poi vn'altro cauic­
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              chió, o chiodo, & con la ſua punta meſſo nella teſta tra eſſe
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              due corde, ſi andarà tenendole così tirate, deſcriuendo la
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              linea DE, CD, co'l fare ſcorrer ſempre la detta corda così
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              doppia tra i due cauicchi AB, con laquale ſi verrà a formare, ſi come altrui piacerà, la forma del
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              circolo ouato. </s>
            </p>
            <figure id="id.031.01.018.5.jpg" xlink:href="031/01/018/5.jpg" number="32"/>
          </chap>
        </body>
      </text>
    </archimedes>
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