The talk covers the complete history from the initial ideas in 1827, installation in 1833, and then the evolving method of control. One method of control was due to an electronic system that I designed to take the time from the NPL controlled low frequency time service, MSF. This worked for a number of years until the Observatory was struck by lightning, with time now derived from GPS.  This talk will be given by Doug Bateman, Antiquarian Horological Society

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