Agricola, Georgius, De re metallica, 1912/1950

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1ground. This kind of an opening, however, differs from a tunnel in that it
is dark throughout its length. whereas a tunnel has a mouth open to daylight.
55[Figure 55]
A—SHAFT. B, C—DRIFT. D—ANOTHER SHAFT. E—TUNNEL. F—MOUTH OF TUNNEL.

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