<P> The quarter bells play a once - repeating, 20 - note sequence of rounds and four changes in the key of E major: 1--4 at quarter past, 5--12 at half past, 13--20 and 1--4 at quarter to, and 5--20 on the hour (which sounds 25 seconds before the main bell tolls the hour). Because the low bell (B) is struck twice in quick succession, there is not enough time to pull a hammer back, and it is supplied with two wrench hammers on opposite sides of the bell . The tune is that of the Cambridge Chimes, first used for the chimes of Great St Mary's church, Cambridge, and supposedly a variation, attributed to William Crotch, based on violin phrases from the air "I know that my Redeemer liveth" in Handel's Messiah . The notional words of the chime, again derived from Great St Mary's and in turn an allusion to Psalm 37: 23--24, are: "All through this hour / Lord be my guide / And by Thy power / No foot shall slide". They are written on a plaque on the wall of the clock room . </P> <P> One of the requirements for the clock was that the first stroke of the hour bell should be correct to within one second per day . The tolerance is with reference to Greenwich Mean Time (BST in summer). So, at twelve o'clock, for example, it is the first of the twelve hour - bell strikes that signifies the hour (the New Year on New Year's Day at midnight). The time signalled by the last of the "six pips" (UTC) may be fractionally different . </P> <P> 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 . </P> <P> In August, 2017, satirical news site The Rochdale Herald published a spoof article stating that the bell was to be renamed "Massive Mohammed". Many people mistook this for a genuine news story and were widely ridiculed on Social Media . This even inspired the creation of two online petitions . </P>

Who was the clock big ben named after
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