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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 Conference on Weights and Measures defines the second on the basis of vibrations of the cesium atom; the world's timekeeping system no longer has an astronomical basis...
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