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.
Waltham Township is located in LaSalle County, Illinois. As of the 2010 census, its population was 446 and it contained 200 housing units. Geography. According to the 2010 census, the township has a total area of 37.01 square miles (95.9 km2), all land.