Abstract
A great deal of work on the hadronic component of cosmic rays has been done by Russian groups working at the high altitude (3340 m) laboratories at Tien Shan and employing very large 'ionization calorimeters' of area 40 m2 and depth of the order of 10 interaction lengths. The Leeds work was stimulated by some as yet unexplained phenomena, observed by the Russian groups to occur in the energy range 1013–1015 eV, which we thought ought to be observable in the energy spectrum of hadrons present in the atmosphere.
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