"BIG BEN" Big Ben Tip by whitecliff62
Big Ben, London: 149 reviews and 225 photos
This is the most famous clock in the world and i have found out a few things that might interest you about Big Ben
The total height of the tower is 316ft.
The height of the belfry is about 200ft.
There are 290 steps to the clockroom and 340 to the belfry.
The quarter chiming bells are in the key of F
The hour bell (Big Ben) is note E and weighs 13.5 tons and has a maximum diameter of 9ft.
The hammer of the hour bell weighs 4cwt.
The four quarter bells weigh (in order of size) 1 ton, 1.25 tons, 1.6 tons and 3.5 tons.
THE DIALS AND HANDS
The diameter of each of the four dials is 23ft.
Each dial contains 312 panes or glass.
28 bulbs are used to light each dial from behind.
The hour hands are 9ft long and weigh 0.8 cwt.
The minute hands are 14ft long and weigh 2.5cwt.
The roman numerals are 2ft high.
THE CLOCK MECHANISM
Three train flatbed mechanism with Grimthorp's double three-legged gravity escapement and two-second pendulum.
The frame of the mechanism is about 16ft long and the entire machine weighs 5 tons.
The driving weights weigh 2cwt. (going), 1 ton (striking) and 1.25 tons (chiming)
The chiming and striking trains have been wound by motor since 1912 but the previous hand winding took two men 5 hours per train.
The going train is still wound by hand which takes about 30 mins.
The overall lenth of the pendulum is about 14ft and it weighs 2.5cwt.
Address: Westminster, London SW1A 0AA
Directions: Nearest Tube, Westminster Station. Near Bridge St.
Phone: +44 20 7219 4272
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