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The vast aluminum windows manufactured by General Bronze on the east and west building walls are cantilevered beyond the structural steel columns and are supported within the light aluminum framework on double-hung aluminum sashes and fitted with blue-green heat-absorbing plate glass. [9] The iconic building sits as a testament to world unity. [28]
Nordic Gold, composed of 89% copper, 5% aluminium, 5% zinc, and 1% tin, is a more recently developed aluminium-bronze alloy for coinage. It was first used for the Swedish 10-kronor coin in 1991, and became widespread after the introduction of Nordic gold 10, 20 and 50-cent Euro coins in 2002.
It was also known for New York City's Atlas [7] and Prometheus [7] bronze sculptures in Rockefeller Center, the bronze doors for the United States Supreme Court, [8] Commerce, and Department of Justice Buildings in Washington, DC, [4] the aluminum windows for the United Nations Secretariat Building [9] [10] and Chase Manhattan Bank Building. [11]
Weathered bronze darkens the external appearance of windows to approximately the same degree as charcoal or black aluminum. Bronze is somewhat more resistant to denting than aluminum. Less common screen fabrics include copper, brass, stainless steel, and galvanized steel.
Bronze is an alloy consisting primarily of copper, commonly with about 12–12.5% tin and often with the addition of other metals (including aluminium, manganese, nickel, or zinc) and sometimes non-metals (such as phosphorus) or metalloids (such as arsenic or silicon).
Aluminium alloys found many uses in the late 19th and early 20th centuries. For instance, aluminium bronze is applied to make flexible bands, sheets, and wire, and is widely employed in the shipbuilding and aviation industries. [101] Aviation used a new aluminium alloy, duralumin, invented in 1903. [102]
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