![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLHZoJXhL60z8eWo-Hx2f-wb5al4zDvfMhppSlypPnACc92YU63lTy1Ryvtftl3SyFUA7VLI7cx-pKhcwlnTz4YFUIc3YS1c0Ssa-YbwG5l3alLHqyYJDHFB57iBo-WZmRY3JDbgNqe7g/s640/clock.jpg)
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
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