Abstract
A thermal theory of the production of electrode vapor jets by arcs and sparks is presented which accounts satisfactorily for all known experimental results on vapor jets. The computed vapor jet velocities are in excellent agreement with those measured for mercury sparks by Haynes and for the high current carbon arc by the author and his co-workers. Theoretical predictions concerning the dependence of vapor jet production on the electrode materials provide a possibility for further checks of the theory.

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