Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, and by extension for the clock tower itself, which stands at the north end of the Palace of Westminster in London, England. Originally known simply as the Clock Tower, it was renamed Elizabeth Tower in 2012 to mark the Diamond Jubilee of Elizabeth II. The clock is a striking clock with five bells.

Edward John Dent (1790–1853) was a famous English watchmaker noted for his highly accurate clocks and marine chronometers.