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Unworked copper nugget. The native copper, as well as the technique of cold working it, is believed to have come from the Great Lakes area, hundreds of miles to the north of the Cahokia polity and most other Mississippian culture sites, although the copper workshops discovered near Mound 34 at Cahokia are so far the only copper workshops found at a Mississippian culture archaeological site. [5]
Copper working has been done in central Mexico since the pre Hispanic period. [1] However, it is not the first area in the Americas to begin working with the metal. The first evidence of copper work is in what is now the Midwest of the United States as the metal was found here fairly easily on the surface without mining. [2]
A laundry copper. A wash copper, copper boiler or simply copper is a wash house boiler, generally made of galvanised iron, though the best sorts are made of copper. In the inter-war years they came in two types. The first is built into a brickwork furnace and was found in older houses.
A sink/basin in a bathroom Enamel washbowl and jug Sink in Croatian National Theater in Zagreb, Croatia. A sink (also known as basin in the UK) is a bowl-shaped plumbing fixture for washing hands, dishwashing, and other purposes. Sinks have a tap (faucet) that supplies hot and cold water and may include a spray feature
Brass is an alloy of copper, which is widely used as a sheet metal. It has more strength, corrosion resistance and formability when compared to copper while retaining its conductivity. In sheet hydroforming, variation in incoming sheet coil properties is a common problem for forming process, especially with materials for automotive applications.
The mining water contains copper salts in the form of copper sulfate CuSO 4. The iron then reacts with the copper, displacing it from the sulfate ions, causing the copper to precipitate onto the iron sheets, forming a "wet" powder. Finally, the precipitated copper is collected and refined further through the traditional smelting process.
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