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Technology: Robert Stephenson Britannia Railway Bridge, Menai Straits, Wales,1845-1850. 1500 ft. long continuous box beams. Central spans of 460 ft. Supporting arch trusses, 1970-71. Photo '90.
Technology: Robert Stephenson Britannia Railway Bridge, Menai Straits, Wales,1845-1850. 1500 ft. long continuous box beams. Central spans of 460 ft. Supporting arch trusses, 1970-71. Photo '90.