Abstract
Cosmic ray data and upper air data recorded at Murchison Bay during the IGY have been used to estimate the atmospheric effects on the sea level meson intensity recorded by the standard cube. The pressure corrected nucleonic intensity has been used to eliminate variations due to fluctuations in the primary intensity. It is shown that the regression equations proposed by Duperier and Dorman lead to practically identical corrections for the atmospheric effects. DOI: 10.1111/j.2153-3490.1961.tb00085.x