EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Edward Condon (1902-1974, left) and Harold Lyons (1913-1998, right), American physicists. Both Condon and Lyons contributed to producing the first atomic clock in 1949. Condon was director of the NBS (National Bureau of Standards) from 1945 to 1951. Lyons previously worked on microwave frequency standards, leading to his interest in atomic frequency standards and the development of the atomic clock, which was based on the absorption of microwaves of ammonia. At centre is Richard Roberts, director of the NBS from 1973 to 1975. Here, they are with the atomic clock NBS-4, which was invented in 1968.
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