Silver extraction

Numéro d’image : 11904833
Silver extraction
Silver extraction from copper. Historical engraving showing the equipment used to extract silver from black copper. Two furnaces are shown. The furnace on the left is being prepared for use,while the furnace on the right is in use. The disks (3) are the alloy from which the silver is to be extracted. Silver has a lower melting point than copper,therefore when the alloy is heated the silver melts away first (5). Taken from The Laws of Art and Nature,in Knowing,Judging,Assaying,Fining,Refining and Inlarging the Bodies of Confin'd Metals (1683),John Pettus,a translation of the work by Lazarus Erckern
Licence : Droits gérés
Crédit: Science Photo Library / Bernard, George
Taille de l’image : 3425 px × 5122 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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