Because we live in an era of rapid technological change, we are used to (if not necessarily comfortable with) the idea of obsolescence. When I started my first job as an engineer, our office relied on a mini-computer for heavy-duty analysis, and on paper and calculators for everything else. We had one phone for every …

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Something You Don’t See Every Day

That is a picture (click to enlarge) of a Guastavino vault floor supported on a Guastavino arch “girder.” Guastavino construction – thin-shell vaults made from layered tiles – was Catalan vaulting adapted to American practice. It’s famous for long spans and impressive structures. At this building, it’s used for all of the interior floors, and …

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