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.
Effingham County, Illinois. For other places named Effingham, see Effingham (disambiguation). Effingham County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 34,242. Its county seat is Effingham. Effingham County comprises the Effingham, IL Micropolitan Statistical Area.