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radiosonde

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Washington, D.C. The U.S. Weather Bureau station at the National Airport. High frequency radio receiver recording signals from small radio transmitter attached to radiosonde balloon aloft. The signals reveal temperature, humidity and pressure at various altitudes

Washington, D.C. The U.S. Weather Bureau station at the National Airpo...

Public domain photograph of Washington DC, 1930s, free to use, no copyright restrictions image - Picryl description