> 7) Discover that wood makes OK bridges too, make lots of notes about > strength, insect prevention, and the like. Publish the Second Edition. > > 8) Discover metal. Make notes about fatigue and rust. Publish Third > Edition. many years ago, i saw, in the uk midlands, a (large outdoor) museum which had the first metal bridge. it was built as if it had the same characteristics as wood, i.e., big dimensional iron bars the size/shape of the wood beams. later, they discovered the ibeam. randy