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Person

Jerrold Zacharias

A man with gray hair and glasses, wearing a dark blazer over a light blue shirt, stands in front of a screen displaying scientific symbols and data.

American experimental physicist (1905–1986), a veteran of the wartime MIT Radiation Laboratory who later built the first commercial caesium beam atomic clock. In 1953 he proposed a vertical caesium fountain to lengthen interrogation time, but the design failed with thermal atoms and lay dormant for nearly four decades until laser cooling made cold-atom fountains practical.

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