Abstract
A large vertical array of muon detectors has been used to measure the frequency of multiple muons from extensive air showers as a function of zenith angle over the range 30 degrees -85 degrees . The experimental data have been compared with the predictions of the theory developed by de Beer et al. (see preceding abstract); accepting the values of the parameters used in this theory it is concluded that there is no evidence for a large increase in the relative flux of heavy nuclei in the energy range 1015l1017 eV. If all the other parameters but the mean transverse momentum (pT) are assumed to be known, the data suggest a mean value of (pT) increasing from 0.37 GeV/c to 0.44 GeV/c as the interaction energy increases from 200 to 3000 GeV.
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