Abstract
An apparatus designed to measure cascade showers initiated by photons and electrons of energies in the range of 1 Bev to 30 Bev was used to measure the energy spectra of cosmic-ray photons and electrons at Climax, Colorado (altitude 11 200 feet). The apparatus consisted of four anthracene-in-polystyrene plastic scintillators, interposed with 2.00 cm, 2.25 cm, and 2.25 cm of lead plates, respectively. Four trays of G-M counters and a set of anticoincidence G-M counters were used simultaneously with the scintillators.