Constantan
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Constantan refers to a copper-nickel alloy commonly used for its stable electrical resistance across a wide range of temperatures. Alternatively it is known in various contexts as Eureka, Advance, or
A spool of Constantan wire
Manganin
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Manganin is a trademarked name for an alloy of typically 84.2% copper, 12.1% manganese, and 3.7% nickel. It was first developed by Edward Weston in 1892, improving upon his Constantan.
Constantan
…of its resistivity, which is constant over a wide range of temperatures. Other alloys with similarly low temperature coefficients are known, such as manganin (Cu [86%] / Mn [12%] / Ni [2%] ). In 1887, Edward Weston discovered that metals can have a negative temperature coefficient of resistance, inventing…
A manganin resistor made in 1900 at the Bushy House physics laboratory.