History Of Atomic Clock
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Title: History Of Atomic Clock

Essay Details:

Subject: American History
Author: Kendra M
Date: March 20, 2016
Level: University
Grade: A
Length: 2 / 361

Essay text:

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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