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) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / UIG / Universal History Archive |
Taille de l’image : | 3045 px × 2879 px |
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Property Release : | Non requis |
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