Bion, Nicolas, Traité de la construction et principaux usages des instruments de mathématique, 1723
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          <head xml:id="echoid-head402" xml:space="preserve">Planche B # Page 266.</head>
          <figure number="22">
            <caption xml:id="echoid-caption5" style="it" xml:space="preserve">Fig. 1.
              <emph style="sub">e</emph>
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            <variables xml:id="echoid-variables4" xml:space="preserve">Y Z m Y m 7 2 f b 30 g a e 6 30 h n d A A B N A P L L M T K 15 I 24 H S G 8 48.Dents F 48 8.Dents E C D 80.Dents R D C B V X</variables>
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            <caption xml:id="echoid-caption6" style="it" xml:space="preserve">Fig. 2.</caption>
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          <figure number="24">
            <caption xml:id="echoid-caption7" style="it" xml:space="preserve">Fig. 3.</caption>
            <variables xml:id="echoid-variables5" xml:space="preserve">e c b f g</variables>
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          <figure number="25">
            <caption xml:id="echoid-caption8" style="it" xml:space="preserve">Fig. 4.</caption>
            <variables xml:id="echoid-variables6" xml:space="preserve">G A C N O H P Q D I R S E K T V F B L 1 2 3 4 M X Y Z V</variables>
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