Greetings,
I have a friend who is a civil engineer and is looking for information regarding a particular type of chinese built bridge called a rainbow bridge.  (ca. 1048 AD)  He is looking specifically for construction methods on this bridge.  I figured with the vast and varied amount of knowledge compounded from the reader's of this list I would be able to find a few leads for him.  Please respond to me directly and thank you very much for your time.

P.A. Cegielski