1. Atomic Clock — 2021-08-20 10:45:05

   …sen and Jack Parry 1955 === ~-[[CategoryScience]]:[[1900s]] In 1955, Louis Essen and Jack Parry built the world's first caesium atomic clock at the National Physical Laboratory in Teddington, [[Middlesex]]. == From Quartz == An Atomic clock, is…
   …arry & Louis Essen with the first Atomic Clock 1955" width="700" }} ::c:: == Atomic Clock == Essen based his clock on caesium because ~& 'An atom will always have the same transition frequency anywhere in the universe'. His clock was a 7 foot l…
   …ong horizontal apparatus with a source of caesium atoms on one end, a microwave cavity in the middle probing the atoms frequency and a sensitive detector at the other en…

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