The Both respirator, also known as the Both Portable Cabinet Respirator, was a negative pressure ventilator (more commonly known as an "iron lung") invented by Edward Both in 1937. Made from plywood, the respirator was an affordable alternative to the more expensive designs that had been used prior to its development, and accordingly came into common usage in Australia. More widespread use emerged during the 1940s and 1950s, when the Both respirator was offered free of charge to Commonwealth hospitals by William Morris.