Courtesy of Wilhammer Industries Harness is part of a new line of fall-arrest equipment. Tragedy sparked a new idea about safety for Max Wilhammer, who creates customized fall-protection harnesses including some that provide longer protection for dangling construction workers who have fallen and been saved by their harnesses.Hanging in a harness after a fall for more than five minutes in an upright posture, with legs relaxed straight beneath the body, can cause serious injury or death, according to Occupational Safety and Health magazine. Wilhammer says that severe injury is possible after eight to 12 minutes. Others have put the time
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.