This had a profound impact. The amount of steel needed to build suspension bridges could be hundreds of tons less than required by previous design practice. Less steel greatly reduced the cost of a bridge. By the late 1920s and into the 1930s great long-span suspension bridges were being built across the country.
Waltham, Massachusetts. Waltham (/ËwÉËlËÎ¸Ã¦m/) is a city in Middlesex County, Massachusetts, United States, and was an early center for the labor movement as well as a major contributor to the American Industrial Revolution.
Stratham, New Hampshire. Stratham is a town in Rockingham County, New Hampshire, United States. The town had a population of 7,255 at the 2010 census, and an estimated population of 7,280 in 2013. It is bounded on the west by the Squamscott River.