In 1779, what material was used in the Severn River Bridge (Fig. 30-22), which replaced the heavy, hand-cut stone voussoirs of earlier bridges?

Name: In 1779, what material was used in the Severn River Bridge (Fig. 30-22), which replaced the heavy, hand-cut stone voussoirs of earlier bridges?
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The Severn River Bridge, also known as the Iron Bridge, was the first major bridge in the world to be made of cast iron, marking a significant development in engineering and architecture.

In 1779, What Material Was Used in the Severn River