This radiosonde, circa 1932, is a production version of an instrument designed by Robert Bureau, who was the first to report the use of a balloon-borne shortwave radio to transmit meteorological data in 1929. Marked "Constructions Mecaniques et Electriques P. de Presale, 104-106, Rue Oberkampf, Paris (XI) Type PTU (Sereal) 3567." The aluminum foil covered box, 27x 16x 14 cm, contains a transmitter (vacuum tube and batteries missing) and elements for measuring temperature (bimetallic), pressure (bourdon tube), and humidity (hair hygrometer). Temperature and pressure were indicated by interruptions in the transmitting signal.
J. L. Dubois, R. P. Multhauf, and C. A. Ziegler "The Invention and Development of the Radiosonde with A Catalog of Upper-Atmospheric Telemetering Probes in the National Museum of American History, Smithsonian Institution", p.31-36. (https://repository.si.edu/handle/10088/2453)
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