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.
Click to draw/clear Waltham township borders. 82% of Waltham township residents lived in the same house 5 years ago. Out of people who lived in different houses, 65% lived in this county. Out of people who lived in different counties, 72% lived in Illinois. This state: 462.