Gravesande, Willem Jacob 's, An essay on perspective
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            <caption xml:id="echoid-caption34" style="it" xml:space="preserve">page 56.
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            Plate. 15</caption>
            <variables xml:id="echoid-variables33" xml:space="preserve">F H O Z D G</variables>
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            <variables xml:id="echoid-variables34" xml:space="preserve">T N M L a R Q E I A C P B</variables>
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          <figure number="37">
            <caption xml:id="echoid-caption36" xml:space="preserve">Fig. 37</caption>
            <variables xml:id="echoid-variables35" xml:space="preserve">F S V T I E M A N X P C B</variables>
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