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The clock took fewer than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the Time and Frequency Division of NIST's Physical Measurement Laboratory. [1] The clock replaced NIST-7, a cesium beam atomic clock used from 1993 to 1999. NIST-F1 is ten times more accurate than NIST-7.
In 1964, Leonard Cutler and his colleague Al Bagley invented the first all-solid-state cesium-beam chronometer known as the HP5060A Cesium Beam Clock. The clock measured international time within a microsecond and increased the accuracy of time tracking from a millisecond held by its predecessors.
The rack mounted units in the background are HP 5071A cesium beam clocks. The black units in the foreground are Sigma-Tau MHM-2010 hydrogen maser standards. An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels.
The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK [1] and promoted worldwide by Gernot M. R. Winkler of the United States Naval Observatory. Caesium atomic clocks are one of the most accurate time and frequency standards, and serve as the primary standard for the definition of the second in ...
Oscilloquartz, a company of Adtran Inc., is a manufacturer of network and application timing technology including atomic clocks, grandmaster clocks, PTP slave and boundary clocks, GNSS clocks and Time Scale Systems. Oscilloquartz's portfolio also includes its Ensemble synchronization monitoring and management software.
18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H National Institute of Information and Communications Technology; ... Caesium Beam Atomic Clock [18] [19] Cs
Symmetricom was one of the only two world’s commercial supplier of cesium atomic standards (atomic clocks) - the other one is Oscilloquartz, in Switzerland. By weighted average, Symmetricom atomic clocks contributed over 90% of UTC (Coordinated Universal Time, the world time standard).
Salem Clock Company; Hartford, Connecticut; Sangamo Electric Company; Springfield, Illinois (1899–1931) Self Winding Clock Company; New York City, New York (1886-1970) Sempire Clock Company; St.Louis, Missouri (1897-1908) Seth Thomas Clock Company (1807–Present) Sessions Clock Company; Bristol, Connecticut (1903–1969)