German radiosonde RS-3 showing wet bulb thermometer and vacuum bottle for the
pressure element. The radiation shields stand aside for display.
Volume 3, No. 1 of the Army Air Forces Weather Service Bulletin, p. 1.
Image ID: wea03642, NOAA's National Weather Service (NWS) Collection Credit: Headquarters Weather Wing Army Air Forces; Courtesy of the family of Nels Johnson, United States Weather Bureau (dec.)