Constantan is a copper-nickel alloy usually consisting of 55% copper and 45% nickel. Also known as Eureka. Its main feature is its resistivity which is constant over a wide range of temperatures. Other alloys with similarly low temperature coefficients are known, such as manganin (Cu86Mn12Ni2).
In 1887 Edward Weston discovered that metals can have a negative temperature coefficient of resistance, inventing what he called his “Alloy No. 2.” It was produced in Germany where it was renamed “constantan”.
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