Judah Levine with NIST Time Scale (IMAGE)

National Institute of Standards and Technology (NIST)

Judah Levine with NIST Time Scale

Caption

NIST physicist Judah Levine with the NIST time scale, an array of hydrogen masers (microwave versions of lasers) that maintains official US civilian time. NIST atomic clocks are used to calibrate the time scale.

Credit

Burrus/NIST

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