Jelaskan Clock and bells dari Katedral St Paul dalam bahasa melayu

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. 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 the 'Big Ben' mechanism in 1895. The clock mechanism is 19 feet (5.8 metres) 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.

The south-west tower also contains four bells of which Great Paul, cast in 1881 by Taylor's bell foundry of Loughborough, Leicestershire, at 16½ tons was the largest bell in the British Isles until the casting of the Olympic Bell for the 2012 London Olympics. This bell has traditionally sounded at 1 o'clock each day. Great Paul has not been rung for several years because of a broken chiming mechanism. The clock bells included Great Tom, which was moved from St Stephen's Chapel at the Palace of Westminster  and has been recast several times, the last time by Richard Phelps. It chimes the hour and is traditionally tolled on occasions of a death in the royal family, the Bishop of London, or the Lord Mayor of London, although an exception was made at the death of the US president James Garfield. It was last tolled for the death of Queen Elizabeth, the Queen Mother, in 2002.

In 1717, Richard Phelps cast two more bells that were added as "quarter jacks" that ring on the quarter-hour. Still in use today, the first weighs , is  in diameter and is tuned to A flat; the second weighs  and is  in diameter and is tuned to E flat.

The north-west tower contains a ring of 12 bells by John Taylor & Co of Loughborough hung for change ringing and the original service or "Communion Bell" dating from 1700 and known as "the Banger" which is rung before 8.00 am services.

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