J. Lowe from NIST tells us a brief history and the 'how it works' of atomic clocks. Atomic clocks are a natural reliable time keeper and there are many ways to go about building a clock including magnetic or laser methods. He mentions early pioneers of atomic clocks, and some of the most most modern methods. This video is part II.B.v2 of our Time instruments section of the Universe of Instrumentation program.
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