Answer:
He describes it in his own experience and knowledge, he states in the passage how most of the people who works in these horrible conditions usually feel the effect of these horrible conditions on their mental and physical selves. The rolling mills are prone to accidents. The occurrence of burns is common, and they can sometimes be fatal. It is crucial to take great care in moving around so much fire and heated material, as everything is extremely warm, such as the floors, the principals, the rollers, the bogie handles, and the tools themselves. Wheelbarrows require special balance to be used for some of the carrying. Even the tiniest obstruction will unravel it, and a little awkwardness from the workman will bring the huge burden to a halt. Anytime you meet these young men, you can tell they work in steam-hammer or rolling mills. Their faces are usually ghastly white and they are usually lank and thin. Their nostrils are distended, and rings of black and blue surround their eyes.