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In page St Paul's Cathedral:

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A clock was installed in the south-west tower by Langley Bradley in 1709 but was worn out by the end of the 19th century.[1] The present mechanism was built in 1893 by Smith of Derby incorporating a design of escapement by Edmund Denison Beckett similar to that used by Edward Dent on Big Ben's mechanism in 1895. The clock mechanism is 19 feet (5.8 m) long and is the most recent of the clocks introduced to St Paul's Cathedral over the centuries. Since 1969 the clock has been electrically wound with equipment designed and installed by Smith of Derby, relieving the clock custodian from the work of cranking up the heavy drive weights.[citation needed]