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Cutting-edge technology won't show us the way

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I notice that cutting-edge computer technology has discovered that Abraham Darby's iron bridge over the Severn was constructed using ordinary carpentry techniques.

I first saw this bridge in the mid-'40s as a student at Birmingham School of Architecture.

It was unmistakably obvious that it was constructed using normal carpenter's mortise and tenon joints for the compression members, and that each one had been individually cast and tapered to fit as construction went along.

What on earth could cuttingedge technology have revealed that was not already evident to the owner of Mitchell's 'Building Construction'?

Jack Speight, Welwyn Garden City, Herts

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