Normal Arc Characteristic Curves: Dependence on Absolute Temperature of Anode

The equation $V=A+\left(\frac{B}{I^n}\right)$ for normal arc characteristic curves has been verified and the temperature range over which $n$ has been found to be proportional to the absolute temperature of the boiling point of the anode material has been extended to include the zinc arc in argon at 1180°K with 0.345 for $n$ and the tungsten arc in air at approximately 5100°K with $n=1.38\mathrm{}$.