Steel (or iron) truss bridge across the Douro River, Portugal

Steel (or iron) truss bridge across ta tributary of the the Douro River. Portugal. Compare the use of this truss for a bridge with two stone piers and one joining stone arches.

Photograph and text by George P. Landow. [You may use this image for any noncommercial purpose as long as you credit the photographer and this URL].


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