Louis Essen
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- Research Papers-Relativity Theory/Download/783
- GPS, Flying Clocks and Fun with Relativity
- Atomic-Timekeeping-Poster
- A Brief History of Timekeeping from Sticks in the Ground to Caesium Atomic Clocks, Humans Have Been Keeping Track of Time with Increasing Accuracy for Millennia
- Special Relativity and Inertia in Curved Spacetime
- UTC and the Leap Second
- Electronically Measuring the Speed of Light
- Letter from Louis Essen to Carl A. Zapffe by Harry H
- A Matter of Time the Arrival of a New Type of Timekeeper Heralds the End of the Second As We Know It, As Helen Margolis Explains
- A New Perspective on Relativity B1197-Ch01
- On the Issue of Einstein's Sceptics
- Amazingly Precise Optical Atomic Clocks Are More Than Timekeepers CORE CONCEPTS Adam Mann, Science Writer
- A Brief History of Timekeeping
- The Theories of Relativity and Bergson's
- Determining the Speed of Light
- The Leap Second
- Atomic Clocks
- An Educational Physics Laboratory Experiment for Directly Measuring the Speed of Light | ATI, April, 2010