This footnote in McCullough's *The Great Bridge* blew my mind. As late as the 1880s, we still didn't know how to build bridges! We would put them up, and many would just collapse.pic.twitter.com/6vjfkQ482H
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So here's an example of a bridge collapse. Diagnosis: the engineer “had not calculated his wind loads accurately”pic.twitter.com/uwtmofMx9U
Probably due to new technology (iron and steel vs stone). It took a while before they could build them reliably?
My first reaction was that iron wasn't that new, but I just looked it up and the first major iron bridge wasn't built until 1779. Still, 100 year later…
Due to corruption? Buildings collapse in developing countries because of corrupt contractors.
Do you think that was the reason in late 19th-century US? Not impossible but strikes me as unlikely that that was the main reason…
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