Nickname

The origin of the nickname Big Ben is the subject of some debate. The nickname was applied first to the Great Bell; it may have been named after Sir Benjamin Hall, who oversaw the installation of the Great Bell, or after boxing's English Heavyweight Champion Benjamin Caunt. Now Big Ben is often used, by extension, to refer to the clock, the tower and the bell collectively, although the nickname is not universally accepted as referring to the clock and tower. Some authors of works about the tower, clock and bell sidestep the issue by using the words Big Ben first in the title, then going on to clarify that the subject of the book is the clock and tower as well as the bell.

Clock

Dials

The clock and dials were designed by Augustus Pugin. The clock dials are set in an iron frame 23 feet (7.0 m) in diameter, supporting 312 pieces of opal glass, rather like a stained-glass window. Some of the glass pieces may be removed for inspection of the hands. The surround of the dials is gilded. At the base of each clock dial in gilt letters is the Latin inscription:

DOMINE SALVAM FAC REGINAM NOSTRAM VICTORIAM PRIMAM

Which means O Lord, keep safe our Queen Victoria the First.

Unlike most other Roman numeral clock dials that show the '4' position as 'IIII', the Great Clock faces depict '4' as 'IV'. The dial also has an adapted 'X', used for number '9', '10', '11' and '12'. This is due to Pugin and his dislike of the numeral 'X'.