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) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / UIG / Universal History Archive |
Bildgröße: | 3045 px × 2879 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |