Agricola, Georgius, De re metallica, 1912/1950

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              <s>
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              not yet pierced between the miners who on opposite sides are digging on
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              the same vein, or cross-stringers, or two veins which are approaching one
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              another.</s>
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            <p type="main">
              <s>But I return to our mines. </s>
              <s>If the surveyor desires to fix the boundaries
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              of the meer within the tunnels or drifts, and mark to them with a sign cut in the
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              rock, in the same way that the
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              Bergmeíster
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              has marked these boundaries
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              above ground, he first of all ascertains, by measuring in the manner
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              which I have explained above, which part of the tunnel or drift lies
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              beneath the surface boundary mark, stretching the cords along the drifts to
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              a point beyond that spot in the rock where he judges the mark should be
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              cut. </s>
              <s>Then, after the same cords have been laid out on the surveyor's field,
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              he starts from that upper cord at a point which shows the boundary mark,
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              and stretches another cross-cord straight downward according to the sixth </s>
            </p>
            <figure number="75"/>
            <p type="caption">
              <s>A—NEEDLE OF THE INSTRUMENT. B—ITS TONGUE. C, D, E—HOLES IN THE TONGUE.</s>
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