Set your watch by the Shepherd Gate Clock

Constructed and installed by Charles Shepherd in 1852, the Shepherd Gate Clock outside the gates at the Royal Observatory in Greenwich was one of the first electrically-driven public clocks, and one of the first to display Greenwich Mean Time to the public.


Unusual due to its 24-hour analogue dial, which always displays Greenwich Mean Time rather than switching to British Summer Time, the clock was originally networked to a number of other clocks around the Observatory, in a system Shepherd had demonstrated at the Great Exhibition where he had been responsible for installing public clocks.

For more, see http://en.wikipedia.org/wiki/Shepherd_gate_clock