Production of penetrating particles in extensive air showers

Abstract
The present paper contains an analysis of the experimental material presented in two previous communications (Broadbent & Janossy 1947 a,b, referred to as I and II) and also the important papers of Cocconi, Loverdo & Tongiorgi (1943, 1944, 1946 a,b), and those of Daudin (1942, 1943). Use is also made of unpublished experimental material obtained by Miss B. Choudhuri.

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