time dilatation

Louis Essen and the Precise Measurement of Time

Louis Essen and the Precise Measurement of Time

On August 24, 1997, English physicist Louis Essen FRS, O.B.E passed away. Essen’s most notable achievements were in the precise measurement of time and the determination of the speed of light. He invented the quartz crystal ring clock and the first practical atomic clock. These devices were capable of measuring time more accurately than any previous clocks. He built a cesium-beam atomic clock, a device that ultimately changed the way time is measured.…
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