Abstract
THE variation of meson intensity with solar time has been studied at Ahmedabad (mag. lat. 13° N., altitude 50 m.) and at Kodaikanal (mag. lat. 1° N., altitude 2,343 m.) with vertical triple-coincidence Geiger counter telescopes of narrow aperture with 11 cm. of lead. Observations at Ahmedabad with two similar independent telescopes extend over a period of two years, while at Kodaikanal with four independent telescopes they extend over a period of five months. Elaborate precautions were taken to keep experimental conditions very constant, and the results of independent but simultaneously operated telescopes at each place were similar. The intensity at each place was determined from hourly photographs of the mechanical recorders. For the purpose of the solar daily variation, the bi-hourly values of intensity were considered.
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