Abstract
Two values for the flux of the hydrogen component in the primary cosmic radiation have been measured. The first one was over Guam in the Marianas Islands, geomagnetic latitude λ = 0°. The value of the flux was found to be (123 ± 12) hydrogen nuclei/m2 sterad sec. The second measurement was made over Texas, λ = 41 °N., and the value found was (530 ± 53) hydrogen nuclei/m2 sterad sec. The detectors in both cases were stacks of nuclear emulsion exposed at high altitude. The results obtained in this experiment are in good agreement with the values obtained by the other authors using electronic counters flown at the same geomagnetic latitudes.

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