There has been relatively little study of the fine structure of turbulent flow near the ground due, in no small part, to the scarcity of suitable instrumentation to measure and record the rapid fluctuations of the wind. The present paper describes a simple heated-thermocouple type of hot-wire anemometer that in a wind averaging 5 m sec−1 is capable of recording sinusoidal wind fluctuations of 10 per sec with an accuracy of better than 90 percent, and of 40 per sec with an accuracy of 50 percent.

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* The research reported in this paper has been sponsored by the Geophysics Research Directorate of Air Force Cambridge Research Center, Air Research and Development Command, under Contract No. AF 19 (604)-145.