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Big Ben is the largest bell in the clock tower of the palace of Westminster.

The clock is famed for its accuracy.

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The clock is rated (set to keep time accurately) by the rather wonderful technique of placing pennies (the old, pre-decimal, currency ones) on, or removing them from, a small tray on the pendulum, thus effectively altering its length by raising its centre of mass for faster, or lowering it for slower, running. The same principle is applied in domestic clocks by moving the bob itself with a small nut - the rating nut - on the rod below it.

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9y ago

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