An Introductory Account of Cosmic Ray
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Physics Department, Haripal G D Institution, Hooghiy, West Bengal ,IN
Rabindranath Chattopadhyay
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While performing experiment with charged electroscope in 1900 Elster, Geitel and C T R Wilson jointly observed that even if it is left standing on a good insulating stand a charged electroscope gets discharged completely after a certain interval. Although an obvious explanation that came immediately after the observation was that a steady inflow of tiny charged particles coming Irom any external source and penetrating through the container wall reach the diverged leaves and discharge them the exact location and the entity of that external source remained obscure for an appreciably long period of time. By then it was a well icnown fact that there exists a steady potential gradient from the Earth's surface outward in which a small atmospheric current of the order of picoampere persists. But that much of current could not account for the time rate of discharging of the electroscope properly. Henceforth a much stronger external source of electrically charged particles was being searched for. That time there were three distinct possibilities in all, [1-4]Downloads
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