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This is less technical and more readable, http://www.amazon.com/Engineer-Human-Failure-Successful-Desi... , and Petroski describes a bridge that failed as the result of a single eyebeam failure. In that case though, there were only 4 very short eyebeams supporting the roadbed, one at each corner. He didn't actually call them eyebeams, but hangers, but from the photos, they are the same thing.

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