UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY
Refining copper in a furnace. In the foreground a coating of copper is being hammered off an iron bar. This was a method of testing to see if the metal was sufficiently refined. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556).
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