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There is a page named "File:Atomic Clock-Louis Essen.jpg" on Wikipedia
DescriptionAtomic Clock-Louis Essen.jpg English: Louis Essen and J. V. L. Parry standing next to the world's first caesium atomic clock, developed at the...(620 × 360 (73 KB)) - 18:12, 30 September 2023
Meanwhile, Louis Essen at the National Physics Laboratory in Britain completed the first working cesium atomic clock in 1955. NBS-1 is an atomic oscillator...(516 × 648 (84 KB)) - 11:18, 25 February 2017
