Evidence of a Penetrating Radiation from Thunderstorms

Abstract

WE have recently carried out experiments which suggest that a penetrating radiation is emitted by charged thunderclouds. In the arrangement used, one pen of an electric chronograph was actuated by a Geiger-Müller counter, another pen by a chronometer marking half-seconds, and a third by the atmospherics received from lightning flashes on a two-valve amplifier. The records have been examined to see whether the kicks of the counter and the flashes showed any significant time relations.