Big Ben Bong Back

Big Ben is back to normal. The melodic quarter-hour chimes from Britain's Houses of Parliament that precede the famous bonging of the 12-tonne Big Ben bell have been silenced by repairs since early June.

On Wednesday, technicians fitted two new hammers to the largest of the four bells that have marked the quarter hours from parliament's clock tower since 1859.

Keeper of the Great Clock Mike McCann said the melodic chimes - replicated on many a mechanical clock or doorbell in homes around the world - resumed just after 4 p.m.

The chimes had been silenced while the Whitechapel Foundry in east London produced two new hammers for the nearly four-tonne quarter bell. The bell needs two hammers because of a repeated note in the tune, said Mark Backhouse, works manager at the foundry.

"The same note is struck in fairly fast repetition, and to get a big hammer to lift and drop takes time," he said, noting that the head of the hammer alone weighs some 90 kilograms.