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Cover of Volume 2, No. 6, of the Army Air Forces Weather Service Bulletin. Tracking a pilot balloon with a bedspring radio direction finder SCR-658 usedfor determining winds aloft. The observer is able to follow a free balloon-transmitter very accurately by adjusting the azimuth and elevation of the bedspringantennae. (Image credit: Headquarters Weather Wing Army Air Forces; Courtesy of the family of Nels Johnson, United States Weather Bureau (dec.))