An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The Evolution of Time Measurement: Part 3 - Atomic Clocks; The Evolution of Time Measurement: Part 4 - Atomic Second
Published
Author(s)
Michael A. Lombardi
Abstract
A historical article about the origins and the development ofatomic clocks and oscillators (Part III of a IV-part series). It describes the first atomic clock experiments, early laboratory and commercial cesium clocks, and the transition from astronomical to atomic timekeeping. It also describes cesium fountain clocks, the most accurate laboratory standards being used today.
Lombardi, M.
(2012),
The Evolution of Time Measurement: Part 3 - Atomic Clocks; The Evolution of Time Measurement: Part 4 - Atomic Second, IEEE Instrumentation and Measurement Magazine
(Accessed June 10, 2023)