Letter | Published:

On the Spark Spectrum of Tungsten in a Helium Vacuum Arc


PROF. O. W. RICHARDSON, in a paper entitled “The Striking and Breaking Potentials for Electron Discharges in Hydrogen” (Proc. Roy. Soc. 106, p. 640, December 1924), comments on the interesting fact that when a barium coated cathode burned out in an atmosphere of hydrogen, the spark lines of barium were developed instead of the arc spectrum.

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