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.
Welcome to Waltham. Waltham is a city along the Charles River in Middlesex County, Massachusetts, United States. It was formed after separation from Watertown in the year 1738. Waltham has played a big role in the labor movement and Industrial revolution of America. In fact it is famous as âWatch City of Americaâ as the Waltham Watch Company that started in 1854 in Waltham was the first company in the country to set up mass production of watches on assembly lines.