Agricola, Georgius, De re metallica, 1912/1950

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              <s>
                <pb pagenum="105"/>
              ground. </s>
              <s>This kind of an opening, however, differs from a tunnel in that it
                <lb/>
              is dark throughout its length. </s>
              <s>whereas a tunnel has a mouth open to daylight.</s>
            </p>
            <figure number="55"/>
            <p type="caption">
              <s>A—SHAFT. B, C—DRIFT. D—ANOTHER SHAFT. E—TUNNEL. F—MOUTH OF TUNNEL.</s>
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