EDGERTON, HAROLD E(UGENE)

born April 6, 1903, Fremont, Neb., U.S. died Jan. 4, 1990, Cambridge, Mass. American electrical engineer and photographer, noted for developing techniques of high-speed photography and applying them to various scientific uses. Edgerton earned a bachelor's degree in electrical engineering from the University of Nebraska in 1925 and received master's (1927) and doctoral (1931) degrees in the same field from the Massachusetts Institute of Technology (MIT). He taught at MIT from 1928, becoming a full professor there in 1948. As a graduate student, Edgerton in 1926 began to experiment with flash tubes. He developed a tube using xenon gas that could produce high-intensity bursts of light as little as 1/1,000,000 of a second in duration. Edgerton's tube is still the basic flash device used in still photography. The xenon flash could also emit repeated bursts of light at regular and very brief intervals and was thus an ideal stroboscope. With his new flash Edgerton was able to photographically record the action of such things as drops of milk falling into a saucer, a tennis racket hitting a ball, and bullets impacting against a steel plate or traveling at speeds of up to 15,000 miles per hour (24,100 kilometres per hour). The resulting images often possessed artistic beauty in addition to their value to industry and science. Edgerton explored many uses for his new photographic equipment. During World War II he constructed stroboscopic units to photograph the night operations of enemy troops. After the war he and his associates photographed U.S. nuclear test explosions. Later he devised methods and equipment to photograph sea life at unprecedented depths.