Letter | Published:

Intensity of Cosmic Radiation in the High Atmosphere

Naturevolume 130page364 (1932) | Download Citation



ON Aug. 12, I succeeded in measuring the intensity of cosmic radiation in the high atmosphere, at air pressures down to 22 mm. of mercury, by means of two rubber balloons and a self-registering electrometer. The electrometer was working on the same principle as that used for the investigations in Lake Constance.1 The position of an electrometer wire is photographed every four minutes on a fixed photographic plate. The volume of the ionisation chamber was 2.1 litres, the thickness of its walls was 0.5 mm. The air pressure outside and temperature within the apparatus were measured simultaneously with the electric tension by limiting the length of the wire pictures by an aneroid on one side and by a bimetallic lamella on the other. The apparatus was protected against the low air temperature in the stratosphere by a case of ‘Cellophane’, which catches the sun's rays like a ‘forcing-house’. Therefore the temperature inside the apparatus only varied between +15° and +37C°.

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  1. 1

    Z. Phys., 74, 433; 1932.

  2. 2

    Naturwissenschaften, Aug. 5, 1932.

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  1. Physical Institute of the Technical High School, Stuttgart

    • E. REGENER


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