Loam used for casting moulds and cores at the Woolwich Arsenal Loam used for casting moulds and cores at the Woolwich Arsenal
Precipitate from "Rio Tinto;" furnace-dried and ready for smelting Precipitate from "Rio Tinto;" furnace-dried, ready for smelting
Calcined ore from the Mines Royal Copper Works, presented by W. Edmonds Calcined ore from the Mines Royal Copper Works