The bridge consists of two bridge towers tied together at the upper level by two horizontal walkways, designed to withstand the horizontal tension forces exerted by the suspended sections of the bridge on the landward sides of the towers. The vertical components of the forces in the suspended sections and the vertical reactions of the two walkways are carried by the two robust towers. The bascule pivots and operating machinery are housed in the base of each tower. The bridge’s present colour scheme dates from 1977, when it was painted red, white and blue for Queen Elizabeth II’s Silver Jubilee. Originally it was painted a mid greenish-blue colour. Read more on wikipedia.
To the extent possible under law, Skitterphoto has waived all copyright and related or neighboring rights to The tower bridge.