Radio frequency h.v. phenomena [with discussion]

A paper giving the results of h.v. measurements made on needle gaps, wire gaps or parallel wires, sphere gaps, air capacitors and insulators, carried out at 13 000 kc./s. and for comparsion, at 60 c./s. at various voltages up to about 26 kV. It is concluded that there is a definite correlation between h.v. phenomena at high radio frequencies and at 60 c./s. The 60 c./s. phenomenon which parallels the h.f. breakdown most closely appears to be corona. The gradients at which h.f. breakdowns take place are about 60% of the gradients at which the 60 c./s. visual corona begins and, moreover, they appear to be equal, approximately, to the 60 c./s. disruptive gradient.