Big Ben Clock tower in London, England. Big Ben Clock Tower London symbol Big Ben is the name of a 14 ton heavy bell. Named after Sir Benjamin Hall as construction supervisor. 1858 The panel has a diameter of 7.5 mm. The minute hand is 4.25 m long. 320 feet high. The clock hit every hour. It is the world’s largest and most important watch. Because the observatory in Greenwich. World Time Control Center Used as a standard timepiece via the BBC radio station, the timepiece of this watch. I have to lean to the world.