Bridge

The arch was first used by the Roman Empire for bridges and aqueducts, some of which still stand today. The Romans also had cement, which reduced the variation of strength found in natural stone. Brick and mortar bridges were built after the Roman era, as the technology for cement was lost then later rediscovered. This photograph was taken on the Roman Walk, Dorchester, Dorset.
© 2004 onwards by Dr Himanshu Tyagi. All the photographs in this blog are copyright protected and can not be reproduced or stored in any medium without the written permission from Dr Himanshu Tyagi.