. De re metallica. Metallurgy; Mineral industries. BOOK V. 105 ground. This kind of an opening, however, differs from a tunnel in that it is d irk thnmtthout its li ne;th whereas a tunnel has a mouth open to di\lii,ht. A—Shaet, B, C—Drift. D—Another shaft. E—Tunnel, F—Mouth of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Agricola, Georg, 1494-1555; Hoover, Herbert, 1874-1964. New York, Dover Publications

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