[Serviceman using Rawin weather device]

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Identifier1991-07-17-A_image_039Parts1991-07-17-A_image_039_011991-07-17-A_image_039_02SourceThe William Orthman World War II Collection (1991-07-17-A), Box 1, Folder 3CreatorUnited States. Army. Air CorpsDescriptionPhotograph of a U.S. Army Air Forces serviceman using a Rawin weather device to measure wind velocity at different altitudes, circa 1940s.

Typed on verso: "Above is pictured a weather 'rawin' in operation. It is a weather device used by the weather men of the U.S. Army Air Forces for visual observation of a balloon, called a 'pibal' which is released to determine wind velocity at different altitudes. The 'rawin' principle is based on radio 'triangulation', a method of direction finding well understood by all amateur radio 'hams.' By timing the ascent of the balloon and computing the speed with which it drifts with the wind, 'rawin' is able to tell at any given moment the altitude it has reached. It gives to weather men a clear picture of what is happening above the earth's surface. (Official USAAF photo."

Stamped on verso: "Official Photograph. U.S. Army Air Corps."Creation Datecirca 1940sSubjectUnited States. Army Air ForcesWorld War, 1939-1945SoldiersOriginal Formatphotographic printsBibliographic CitationThe William Orthman World War II Collection/The Museum of FlightRightsNo copyright - United States

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CollectionWilliam Orthman World War II CollectionCollection AreaArchives

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[Serviceman using Rawin weather device]