Assaying: Various muffles used in assay ovens for assaying gold and silver 1,2,3: 4,5,6,stopples,bottom plates and covers: 7,wooden mould for forming muffles: 11,12,bottom and top of assay crucible. From 1683 English edition of Lazarus Ercker Beschreibung allerfurnemisten mineralischen Ertzt- und Berckwercksarten originally published in Prague in 1574. Copperplate engraving | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / UIG / Universal History Archive |
Taille de l’image : | 2780 px × 3144 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |