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Copper sheathing. Copper sheathing is a method for protecting the hull of a wooden vessel from attack by shipworm, barnacles and other marine growth through the use of copper plates affixed to the surface of the hull, below the waterline. It was pioneered and developed by the Royal Navy during the 18th century.
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]
Paul Revere's Copper Mill with Canton Viaduct in the foreground. Copper rolling is the process of converting large blocks of copper into thin sheets by rolling them gradually down to size. These sheets of copper were used in the 18th and 19th centuries mainly to plate the bottoms of ships.
Indian copper plate inscriptions. Indian copper plate inscriptions are historical legal records engraved on copper plates in the Indian subcontinent. [1] Donative inscriptions engraved on copper plates, often joined by a ring with the seal of the donor, were legal documents registering the act of endowment. It was probably necessary to produce ...
The Wulfing cache, or Malden plates, are eight Mississippian copper plates crafted by peoples of the Mississippian culture. They were discovered in Dunklin County, Missouri in 1906 by Ray Grooms, a farmer, while plowing a field south of Malden. [1] The repousséd copper plates were instrumental to archaeologists' developing the concept known as ...
A sheet of sterling silver was heat-fused onto the top of a thick copper ingot. When the ingot was repeatedly rolled under pressure to produce thin sheets, the relative thicknesses of the two layers of metal remained constant. The alternative was to electroplate a layer of pure silver onto a bare copper sheet. The two technologies were ...
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