Tower Bridge (built 1886–1894) is a combined bascule and
suspension bridge in London which crosses the River Thames. It is close to the
Tower of London, from which it takes its name, and has become an iconic symbol
of London.
The bridge consists of two towers tied together at the upper
level by means of two horizontal walkways, designed to withstand the horizontal
forces exerted by the suspended sections of the bridge on the landward sides of
the towers. The vertical component 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.
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