First Sentence:
The use of atomic properties for time measurement was born in 1955 when the first caesium beam frequency standard began regular operation in the United Kingdom.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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term frequency instability, caesium beam clock, hyperfine transition frequency, reproducibility postulate, mercury ion frequency standard, residual frequency shifts, beam primary standards, caesium beam standards, hyperfine filter, geocentric coordinate time, ground state caesium atom, ultrahigh frequency signal, caesium beam frequency standards, atom fountain, radiofrequency trap, relative frequency fluctuations, rotating geoid, operational filter, active hydrogen maser, quartz oscillator frequency, caesium clocks, hyperfine resonance, passive hydrogen maser, ion clock, caesium standards
Key Phrases - Capitalized Phrases (CAPs):
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International Atomic Time, Solar System, Global Positioning System, General Conference, International Astronomical Union, Paris Observatory, United Kingdom, Jet Propulsion Laboratory, International Earth Rotation Service, International Radio Consultative Committee, National Bureau of Standards, National Physical Laboratory, Unirersal Time
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