Agricola, Georgius, De re metallica, 1912/1950

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb pagenum="142"/>
              measurement become a greater length than it should be, he sets upon the
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              instrument a standing plummet level, the tongue of which, if the instrument
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              is level, indicates no numbers, but the point from which the numbers start.</s>
            </p>
            <figure number="70"/>
            <p type="caption">
              <s>COMPASS. A, B, C, D, E, F, G ARE THE SEVEN WAXED CIRCLES.</s>
            </p>
            <p type="main">
              <s>When the surveyor has carefully observed each separate angle of the
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              tunnel and has measured such parts as he ought to measure, then he lays
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              them out in the same way on the surveyor's field
                <emph type="sup"/>
              20
                <emph.end type="sup"/>
              in the open air, and again
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              no less carefully observes each separate angle and measures them. </s>
              <s>First of
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              all, to each angle, according as the calculation of his triangle and his art
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              require it, he lays out a straight cord as a line. </s>
              <s>Then he stretches a cord at </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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