BABAK TAFRESHI / SCIENCE PHOTO LIBRARY BABAK TAFRESHI / SCIENCE PHOTO LIBRARY
Greenwich Observatory 24-hour clock. The gate of Greenwich Royal Observatory, London, UK, includes this Shepherd 24-hour clock. Installed in 1852 by the British engineer Charles Shepherd (1830-1905), this is an example of an electric slave clock. Greenwich Park and the buildings of central London are seen in the distance.
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