The boiler was a keystone of America’s Industrial Revolution, helping to propel the country to the status of world superpower. For the better part of a century, however, the boiler posed great risk. By some estimates, from the 1840s to the 1920s, 50,000 people died from boiler explosions every year. Thanks to the work of the American Society of Mechanical Engineers, boiler safety was greatly improved.
Once boilers were made safe, attention turned to performance, as the rating an