Louis Essen
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Louis Essen OBE FRS was an English physicist whose most notable achievements were in the precise measurement of time and the determination of the speed of light. He was a critic of Albert Einstein's t
Louis Essen (right) and Jack Parry (left) standing next to the world's first caesium-133 atomic clock.
The National Physical Laboratory is the national measurement standards laboratory of the United Kingdom. It sets and maintains physical standards for British industry.
Louis Essen
…Essen earned his degree in physics from the University of London in 1928, having studied at University College Nottingham. He started work at the National Physical Laboratory (NPL) the following year, under D. W. Dye, investigating the potential of tuning forks and quartz crystal oscillators for precise time measurement. His…
NPL's main entrance on Hampton Road
The Electricity Division of the National Physical Laboratory in 1944
Robert Watson-Watt