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File:Atomic Clock-Louis Essen.jpg

Atomic_Clock-Louis_Essen.jpg ‎(620 × 360 pixels, file size: 73 KB, MIME type: image/jpeg)

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Summary

Description
English: 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.
Deutsch: Louis Essen und J. V. L. Parry zeigen die erste Caesium-Atomuhr (1955)
Date
Source http://www.npl.co.uk/upload/img/essen-experiment_1.jpg
Author National Physical Laboratory

Licensing

Public domain
This work created by the United Kingdom Government is in the public domain.

This is because it is one of the following:

  1. It is a photograph taken prior to 1 June 1957; or
  2. It was published prior to 1974; or
  3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply)
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media type

image/jpeg

checksum

60a0f2c369087d9515da4e8d411e4740cc99a9ba

determination method or standard: SHA-1

data size

75,162 byte

height

360 pixel

width

620 pixel

File history

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Date/TimeDimensionsUserComment
current08:53, 7 November 2016620 × 360 (73 KB)TholmeHigher quality from http://www.npl.co.uk/upload/img/essen-experiment_1.jpg

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