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Stock Photo: Cross-section of a mine, showing shaft and galleries at two different levels. In the top left of the picture is prospecting for metals using divining rods (dowsing). From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut.
Stock Photo: 1746-1925 Cross-section of a mine, showing shaft and galleries at two different levels.  In the top left of the picture is prospecting for metals using divining rods (dowsing).  From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556).  Woodcut.