1. The Architecture of Ancient Rome
... finished, each pier stood on a foundation of tar covered piles and was constructed of carefully cut stones on the inside. The mortar used between the stones contained pozzolana, a volcanic ash. When the piers reached a height of 30 feet above the river, wooden arches were hoisted into its place between them. A wooden road was nailed to the arches and covered with a layer of earth. The finished road stood over sixty feet above ... the river. For major or busy bridges sometimes stone ... ...
- Word Count: 1593
- Approx Pages: 6
- Has Bibliography
- Grade Level: High School