^Zero α for Nichrome, constantan & Manganin

Zero α for Nichrome, constantan & Manganin

i.e. there is appreciably no change (or very slight change) in R with temperature.

1. Constantan (or Eureka) ≡ Cu 60% & Ni 40%

2. Manganin ≡ Cu 84%, Mn 12% & Ni 4%

3. Nichrome ≡ Ni 67.5%, Cr 15%, Fe 16% & Mn 1.5%