_Coins are a source of information much used by historians. Elaborately detailed mining landscapes on 16th-century German coins in the National Museum, discovered by the curator of numismatics and brought to the author's attention, led to this study of early mine-pumping devices._ THE AUTHOR: _Robert P. Multhauf is curator of Science and Technology, Museum of History and Technology, in the Smithsonian Institution's United States National Museum._…
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