Corona in aircraft electric systems as a function of altitude

R. C. Mason (Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa.): In this paper references are quoted to show that sparking (or corona) cannot occur at less than 351 or 275 volts, depending on which authority one believes, yet, experimentally Mr. Wilson found what he calls “corona” to start in one case at 80 volts rms (113 peak). Is there a real contradiction here? I believe not.