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An experiment of the Rossi-Hsiung type was performed at an altitude of 14,200 ft. with a fourfold coincidence array of Geiger-Müller tubes in a vertical position. Thicknesses of 12.7 to 17.3 cm of lead served as absorber between the counters. Additional varying thicknesses were placed...
The problem of distinguishing a true sidereal diurnal variation in cosmic-ray intensity from a seasonal change in the amplitude of the solar diurnal variation is approached from the standpoint of the harmonic dial type of analysis. It is shown that the regular cyclic arrangement of the datum...
It is shown that the 4.1-hr. period of indium can be produced by nuclear excitation of indium and is to be attributed to an excited metastable state, In 1 1 5 , * of the stable In 115 . This result is obtained by studying the radioactivity produced in indium by neutrons of different energy...
Geiger-Müller tube experiments have been performed to determine the nature of the cosmic rays present at depths of 30 and 300 meters water equivalent from the top of the atmosphere. At both of these depths, the observable cosmic rays are penetrating ionizing rays accompanied by soft showers. The...
Reflection coefficients for ultrasonic waves in gases, much lower than allowed by the dynamical theory of sound, first evaluated for a single frequency by J. C. Hubbard, and found by R. W. Curtis to have a frequency dependence, are satisfactorily explained by the new heat conduction theory of...
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