 | Scott Childs
owner of the Old Time Clock Shop at 1952 W. 13th is a native Wichitan. He completed 22 years of military service and has had over 30 years experience in clock repairs. Scott also teaches Advanced Clock Repair. He is a lifetime member and fellow of the National Association of Watch and Clock Collectors. You can reach Scott at (316) 267-1925. |
Antiques & Collectibles
2003-12-01 09:52:00
What are Atomic Clocks?
: What are Atomic Clocks and Radio-Controlled Clocks?
ANSWER: Long ago, we used to measure time by measuring the Earth's rotation. Today we use a method which basically measures the number of vibrations a certain element gives off. The most common element used in atomic clocks is Cesium 133, whose vibrations are remarkably stable over time. This allows us to keep incredibly accurate time. As of January, 2002, NIST's latest cesium standard clock was capable of keeping time to about 30 billionths of a second per year. Now the cost of a typical cesium atomic clock could keep everyone from having one sitting on their mantle, so the NIST--the National Institute of Standards and Technology, located in Fort Collins, Colorado--worked out a way for all of us to achieve "atomic time." Each day, the NIST sends out a radio broadcast telling any clock that will listen what time it is. Inside one of these "radio controlled" clocks is a small antenna and receiver which synchronizes the clock's minutes, hours, day of the year and year, along with information about daylight savings time and leap years. All that you have to do is set the time zone you are in, and the clock will tell you the exact time. The nice thing about radio controlled clocks is that you never have to set them again. Just change the battery from time to time and they will keep you on track.
