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A Self-Recording Cosmic-Ray Electrometer and Depth-Ionization Curve

🗻Kausarnag Expedition 1928-29
●A Self-Recording Cosmic-Ray Electrometer and Depth-Ionization Curve Expedition By J.M Benade, M.L Joshi, S.H Vatsyayana, A.C Joshi 
•Forman Christian College, Lahore, India
•Published by the American Physical Society On 15 October 1936(@aps.physics)
》 A self-contained automatic recording electrometer connected to a collecting rod in a thin steel-walled ionization chamber was used to measure intensity of cosmic rays at various depths in Konsar Nag, Kashmir. The lake is about 280 ft. deep. Its surface is about 11,600 ft. above sea-level and its water is practically free from radio-active matter. The electrometer consists of two short parallel phosphor-bronze ribbons attached at one end only. Their divergence is recorded photographically at eight minute intervals, and at the end of each hour the fibers are automatically recharged. The temperature, depth, and position of the instrument with respect to the vertical, are also recorded along with electrometer deflections. The curve obtained corresponds to those of Millikan and Cameron to a depth of 50 meters but at greater depths it more closely parallels that of Regener. The slopes of these curves at any particular depth seem to depend upon the type of ionization chamber as well as upon the intensity of the cosmic radiation at that depth.

Received 30 August 1932
●DOI:https://doi.org/10.1103/PhysRev.42.290

©1932 American Physical Society
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