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| | The Burr Truss |
 | | Burr, who designed a trussed arch, and Wernwag, who designed a braced arch, seem to have understood the problem better than most, and their bridges proved quite successful. |
 | | The best of the trussed arches was the Burr truss, the most widely used bridge, at least in Pennsylvania, if not in the whole country, at that time. |
 | | The Burr truss is also mentioned quite favorably in Trautwine, at a date when iron and steel bridges had nearly driven out wooden bridges, except for trestles. |
| www.du.edu /~jcalvert/tech/burr.htm (2080 words) |
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