Caesium Atomic Clock, 1956 is a photograph by National Physical Laboratory (c) Crown Copyright which was uploaded on May 7th, 2013.
Caesium Atomic Clock, 1956
Caesium atomic clock. Physicists Jack Parry (left) and Louis Essen (right) adjusting their caesium resonator, which they developed in 1955. Atoms of... more
Title
Caesium Atomic Clock, 1956
Artist
National Physical Laboratory (c) Crown Copyright
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Photograph
Description
Caesium atomic clock. Physicists Jack Parry (left) and Louis Essen (right) adjusting their caesium resonator, which they developed in 1955. Atoms of vapourised caesium-133 oscillate between two energy levels as they pass back and forth between magnets at each end of the resonator. Counting these oscillations is the basis of the standard second, where one second is about 9193 million oscillations. Essen and Parry's resonator led to the replacement of the astronomical second with the atomic second as the standard unit of time, as it was the first apparatus to be used reliably as a clock on a long-term basis. Photographed at the National Physical Laboratory, Teddington, UK, in 1956.
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May 7th, 2013
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