Photo by the New York Times/Hiroko Masuike Collapse of crane's lattice boom killed laborer and injured three others at site of subway line extension on Manhattan's West Side. Photo by N.Y. Daily News Investigators are looking at frayed cable and broken wire strands on the crane's hoist system for clues to the accident's cause. Investigators looking into the latest deadly crane collapse on a New York City construction site say a failure of the crane's hoist system is the likely cause of the accident, which left one dead and three others injured. But the Metropolitan Transit Authority, the state agency
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.