For the past four months physicists of the National Bureau of Standards at Washington have been sending clusters of small sounding balloons to great heights in the upper air. Purpose: cosmic ray research. The balloons carry Geiger-Müller cosmic ray counters, barographs, automatic radios which send signals to a ground station every 15 seconds, recording the altitude (in terms of air pressure) and the intensity of the cosmic bombardment. Last week Drs. L. F. Curtiss and A. V. Astin reported that one cluster of six balloons had reached the remarkable height of 23 miles...
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