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BTW, while wondering about the hyperboloid shape of cooling towers
(and not running across any strong explanation for why that shape) I happened on the Adziogol lighthouse. "is a graceful vertical lattice hyperboloid structure of steel bars, 70 meters high."
(Now if what you have available is straight steel bar stock, then a ruled surface form must be a great temptation, but surely that's not what motivates nuclear cooling tower builders?)
(Now if what you have available is straight steel bar stock, then a ruled surface form must be a great temptation, but surely that's not what motivates nuclear cooling tower builders?)