Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Essen Louis A1

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Essen Louis A1

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Image title: 
Louis Essen
Credit line: 
British Information Services, courtesy AIP Emilio Segrè Visual Archives, Physics Today Collection

Portrait of Louis Essen, a senior scientist at Britain's National Physical Laboratory, Teddington, near London, who has worked for 30 years on the measurement of time. He built the first atomic clock using caesium atoms at the Laboratory, and showed that it gives an accuracy equivalent to gaining or losing one second in 300 years.

Original format: 
1 photographic print (black and white; 8 x 6 inches)
Essen, Louis