Vitruvius, De architectura libri decem, 1567

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              <s xml:id="echoid-s14333" xml:space="preserve">
                <pb o="190" file="514.01.222" n="222" rhead="LIBER"/>
              gradationes circum habebant, & </s>
              <s xml:id="echoid-s14334" xml:space="preserve">poſt certum graduum numerum, etiam præcinctionem quandam, ideſt planũ
                <lb/>
              latius quàm graduum retractiones per quod iter erat ad gradus. </s>
              <s xml:id="echoid-s14335" xml:space="preserve">Tres erant præcinctiones, prima imæ, ſecun-
                <lb/>
              da mediæ, tertia ſuperiori regioni dabatur: </s>
              <s xml:id="echoid-s14336" xml:space="preserve">ſed eaſcala, quæ ad primam præcinctionem ducebat, non dirige-
                <lb/>
              batur ad ſecundam præcinctionem, ſed in media ſecunda præcinctione alia erat ſcala, quæ ad tertiam dirigebat,
                <lb/>
              atque ita ſcalæ non erant directæ, nec continui aſcenſus. </s>
              <s xml:id="echoid-s14337" xml:space="preserve">Imaginemur autem ad angulos duodecim prædicto-
                <lb/>
              rum trigonorum ſcalarum apertiones dirigi, quæ quaſi cuneum formant, nam duæ lineæ, quæ a circumferentia
                <lb/>
                <figure xlink:label="fig-514.01.222-01" xlink:href="fig-514.01.222-01a" number="86">
                  <image file="514.01.222-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/514.01.222-01"/>
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                <note position="left" xlink:label="note-514.01.222-01" xlink:href="note-514.01.222-01a" xml:space="preserve">10</note>
                <note position="left" xlink:label="note-514.01.222-02" xlink:href="note-514.01.222-02a" xml:space="preserve">20</note>
                <note position="left" xlink:label="note-514.01.222-03" xlink:href="note-514.01.222-03a" xml:space="preserve">30</note>
                <note position="left" xlink:label="note-514.01.222-04" xlink:href="note-514.01.222-04a" xml:space="preserve">40</note>
                <note position="left" xlink:label="note-514.01.222-05" xlink:href="note-514.01.222-05a" xml:space="preserve">50</note>
              unà diſcedunt, & </s>
              <s xml:id="echoid-s14338" xml:space="preserve">ad oppoſitam partem ducuntur, cuneum referunt, idest angulum, qui a linea diuiditur ab
                <lb/>
              acumine proueniens, quod est in circinatione ad centrum, & </s>
              <s xml:id="echoid-s14339" xml:space="preserve">iter oſtendit ad aſcenſus. </s>
              <s xml:id="echoid-s14340" xml:space="preserve">Volo igitur eos cuneos,
                <lb/>
              qui diriguntur ad primam præcinctionem ibi terminari, & </s>
              <s xml:id="echoid-s14341" xml:space="preserve">qui a prima ad mediam præcinctionem ducuntur
                <lb/>
              angulis interpoſitis obuiam eant, & </s>
              <s xml:id="echoid-s14342" xml:space="preserve">ita, qui ad tertiam præcinctionem eunt, non reſpondeant ijs, qui nos ad
                <lb/>
              ſecundam direxere, ſed alijs medijs alternantibus apertionibus, & </s>
              <s xml:id="echoid-s14343" xml:space="preserve">præciſionibus. </s>
              <s xml:id="echoid-s14344" xml:space="preserve">Septem ſint apertiones & </s>
              <s xml:id="echoid-s14345" xml:space="preserve">
                <lb/>
              ad centrum directæ æque diſtantes. </s>
              <s xml:id="echoid-s14346" xml:space="preserve">Vna in medio ſemicirculi amplior, & </s>
              <s xml:id="echoid-s14347" xml:space="preserve">laxior, duæutrinque una a dextris,
                <lb/>
              altera a ſiniſtris diametri, & </s>
              <s xml:id="echoid-s14348" xml:space="preserve">duæ utrinque inter mediam, & </s>
              <s xml:id="echoid-s14349" xml:space="preserve">extremas, duæ inquam a dextris, & </s>
              <s xml:id="echoid-s14350" xml:space="preserve">duæ a ſini-
                <lb/>
                <note position="left" xlink:label="note-514.01.222-06" xlink:href="note-514.01.222-06a" xml:space="preserve">60</note>
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