Notes on the Geography of The United Kingdom: Ironbridge: Photo 5
Because nobody had ever built a bridge with weight-bearing iron girders, Darby was cautious and overbuilt the bridge, using twice as much iron as later bridges. Some 482 main castings were using, of which the largest were the 10 half-ribs, each 70 feet long and weighing six tons. Many of the castings are solid.
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