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Return Time Standards
1945 Isidor Rabi, a physics professor at Columbia University, suggests a clock could be made from a technique he developed in the 1930's called atomic beam magnetic resonance.
1949 Using Rabi's technique, NIST (then the National Bureau of Standards) announces the world's first atomic clock using the ammonia molecule as the source of vibrations.
1952 NIST announces the first atomic clock using cesium atoms as the vibration source. This clock is named NBS-1.
1954 NBS-1 is moved to NIST's new laboratories in Boulder, Colo.
1955 The National Physical Laboratory in England builds the first cesium-beam clock used as a calibration source.
1958 Commercial cesium clocks become available, costing $20,000 each.
1960 NBS-2 is inaugurated in Boulder; it can run for long periods unattended and is used to calibrate secondary standards.
1963 The search for a clock with improved accuracy and stability results in NBS-3.
1967 The 13th General......
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Title: History Of Atomic Clock
Approximate Word Count: 365
Approximate Pages: 2 (250 words per double-spaced page)
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