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Essay

History Of Atomic Clock

Essay specific features

 

Issue:

American History

 

Written by:

James R

 

Date added:

September 12, 2016

 

Level:

University

 

Grade:

B

 

No of pages / words:

2 / 361

 

Was viewed:

3017 times

 

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Essay content:

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...
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This clock was used into the 1990s as part of the NIST time system. 1972 NBS-5, an advanced cesium beam device, is completed and serves as the primary standard. 1975 NBS-6 begins operation; an outgrowth of NBS-5, it is one of the world's most accurate atomic clocks, neither gaining nor losing one second in 300,000 years...
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