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2 cm – approximate width of an adult human finger; 2.54 cm – 1 inch; 3.08568 cm – 1 attoparsec; 3.4 cm – length of a quail egg [112] 3.5 cm – width of film commonly used in motion pictures and still photography; 3.78 cm – amount of distance the Moon moves away from Earth each year [113] 4.3 cm – minimum diameter of a golf ball [114]
The BL 8-inch howitzer Mark I through to Mark V (1 to 5) [note 1] were a British improvisation developed early in the First World War to provide heavy artillery.It used shortened and bored-out barrels from various redundant naval 6-inch guns.