``Black Ball'': A Device for Measuring Atmospheric Infrared Radiation

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Abstract
The problem of the atmospheric infrared heat balance has been solved graphically and analytically, but almost no experimental evidence exists to verify the calculations. The ``Black Ball'' is a device which can be flown on an ordinary radiosonde and indicates a temperature which is related to the total incident infrared flux at any point. The actually observed temperatures must be corrected for convection effects and thermal time constants. Construction and correction data are presented in this paper.