Related Links: Imagining Construction's Future "That's a drafting board, Will. It was largely used by architects to develop drawings of a building before construction," explained George, Will's grandfather, as they toured the Museum of Architecture and Engineering."I don't follow," Will replied. "I don't see how this flat panel could have been used for anything.""Let me try to explain. Long ago, the technology for conveying ideas was primitive compared to today. This is from the days of the written word. We used pencils like this one to make pictures. See how one holds a pencil? It took a long time to
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.