
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original...

When a river refuses to yield, engineers make the bridge move. Steel rises and traffic flows. Henry Grattan Tyrrell's The evolution of vertical lift bridges is a focused civil engineering monograph on one of the most elegant answers to keeping waterways open without stopping...



