Louis Essen, British physicist

Louis Essen, British physicist

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Credit: British Information Services, courtesy AIP Emilio Segre Visual Archives, Physics Today Collection /SCIENCE PHOTO LIBRARY

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Caption: Louis Essen (1908-1997), British physicist, seated at a desk. Essen is best known for developing the first practical atomic clock by integrating the caesium atomic standard with conventional quartz crystal oscillators to allow calibration of existing time-keeping. He also worked on determining the speed of light.

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