A simple mechanical direct-recording meteorograph has been constructed for captive-balloon temperature soundings in the lower 600 meters of the atmosphere. Details of construction and operation are presented. Altitudes are recorded accurately to 1.5% and temperatures to 0.2C°.

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* The development of this instrument was a joint project of the Oceanographic Laboratories, and the Department of Meteorology and Climatology, University of Washington, Seattle, Washington under Chemical Corps Contract W18–035–CWS–1336.