Image: Atomic Clock-Louis Essen
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Atomic_Clock-Louis_Essen.jpg (620 × 360 pixels, file size: 73 KB, MIME type: image/jpeg)
Description: Louis Essen and J. V. L. Parry standing next to the world's first caesium atomic clock, developed at the UK National Physical Laboratory in 1955.
Title: Atomic Clock-Louis Essen
Credit: http://www.npl.co.uk/upload/img/essen-experiment_1.jpg
Author: National Physical Laboratory
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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