On Dec 29, 1905, French engineer Henri Gaston Busignies was born. Busignies is best known for his contributions to radar, radio communication, and radio navigation. His invention (1936) of high-frequency direction finders (HF/DF, or “Huff-Duff“) permitted the U.S. Navy during World War II to detect enemy transmissions and quickly pinpoint the direction from which a radio transmission was coming.

http://scihi.org/henri-busignies-huffduff/

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