A new radio stratosphere ultraviolet meter which operates with a precision comparable to that of laboratory instruments is described. It consists of a photoelectric cell, a balanced amplifier, a relaxation oscillator, and a transmitter. The calibra tion of the instrument is automatically determined and broadcast to the receiving station each time an altitude signal is given. The instrument, with accessories, including sufficient batteries to operate for about 4 hours, weighs about 5 pounds. It operates on a frequency of approximately 50 megacycles and has sufficient power to insure good reception for distances from the receiving station up to 100 miles.
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R. Stair (1939) studied this question.