Tower Bridge, London
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Notes in italics are from London 2: South by Bridget Cherry and Nikolaus Pevsner (1983)
Yale University Press, New Haven and London.
 Tower Bridge 3         Tower Bridge 1          Tower Bridge 2
  Tower Bridge, Southwark. 1886-94 ... by Sir John Wolfe Barry, engineer, and Sir Horace Jones, architect. The lowest bridge on the Thames, its form governed by navigational requirements: The Pool of London was still intensively used by ships and barge-trains, and a clear passage was stipulated of 200 ft width and a  135 ft headroom, to remain unobstructed for two hours at each high tide. This was relaxed after the bridge was built.
In the distance in the middle picture, prominent City of London buildings such as the Natwest Tower and 'The Gherkin' (30 St Mary Axe).
Tower Bridge, South Side          Tower Bridge 3          Tower Bridge 4
  The towers contain passenger lifts and support two high-level footbridges, for use when the bascules were raised. In the architect's words, they are 'steel skeletons  clothed with stone'. The Gothic style was required by Parliament, in deference to the neighbouring tower of London; the barren detailing was performed after Jones's death, however. The side spans are hung from curved lattice girders. The use of the suspension principle follows here from the provision of towers (needed for the high-level footbridge), rather than vice-versa. The stiffening by trussing of the suspension members rather than the suspended  deck is unusual. The bascules were electrified in 1976, but some of the magnificent hydraulic machinery by Armstrong Mitchell & Co. is preserved ... .  
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