出典:Wikipedia
出典:『Wikipedia』 (2011/08/11 20:21 UTC 版)
The Camelback Bridge is a restored historic wooden bridge that arches over the Constitution Trail in Normal, Illinois. It is on the U.S. National Register of Historic Places. The bridge's main span is a wooden kingpost pony truss. The bridge features supports that are Phoenix columns, a special type of iron column that was patented by the Phoenix Iron Company in 1862. They are extremely rare to find today.