For certain applications, copper alloy conductors are preferred instead of pure copper, especially when higher strengths or improved abrasion and corrosion resistance properties are required.
42.
With the Coinage Act of 1965, the Mint transitioned to striking clad coins, made from a sandwich of copper nickel around a core of pure copper.
43.
In the 19th century, pure copper was partially superseded by Muntz metal, an alloy of 60 % copper, 40 % zinc and a trace of iron.
44.
It costs around two-thirds that of pure copper and has identical properties for this application, it becomes the material of choice and Muntz makes his fortune.
45.
The greatness of Middle Sican metallurgy was the large scale smelting and diverse use of arsenical copper, which was more ductile and corrosion-resistant than pure copper.
46.
When Tom Creighton discovered a rich vein of almost pure copper, he thought of the book and called it Flin Flon's mine, mercifully shortening the name.
47.
This economically symbiotic relationship lasted until 1922, when Phelps Dodge provided 90 percent of the blister copper Nichols Copper Company used to produce 100 percent pure copper.
48.
This economically symbiotic relationship lasted until 1922, in which Phelps Dodge provided 90 % of the blister copper Nichols Copper Company used to produce 100 % pure copper.
49.
After public outcry, the Mint developed a process whereby salvaged brass shell casings were augmented with pure copper to produce an alloy close to the 1941 42 composition.
50.
The conductivity of commercial conductors is often expressed relative to the International Annealed Copper Standard, according to which the purest copper wire available in 1914 measured around 100 %.
