Question: why do they call the clock big ben

title: Big Ben
text: Big Ben is the largest of five bells and weighs 13.5 long tons ( 13.7 tonnes ; 15.1 short tons ) . It was the largest bell in the United Kingdom for 23 years . The origin of the bell 's nickname is open to question ; it may be named after Sir Benjamin Hall , who oversaw its installation , or heavyweight boxing champion Benjamin Caunt . Four quarter bells chime at 15 , 30 and 45 minutes past the hour and just before Big Ben tolls on the hour . The clock uses its original Victorian mechanism , but an electric motor can be used as a backup . 

Answer: answer: Big Ben is the largest of five bells. The origin of the bell's nickname is open to question; it may be named after Sir Benjamin Hall, who oversaw its installation, or heavyweight boxing champion Benjamin Caunt.