Within ten years from the time when Mr. Carnegie and his friends bought the oil-farms, their investment had returned them four hundred and one per cent, and the young Scotchman could count himself a rich man. Before this, however, he had entered the iron and steel industry, in which his great wealth has been made. With a little money which he had saved, he borrowed $1,250 from a bank, and, with five other persons, established the Keystone Bridge Works of Pittsburg, with the small capital of $6,000. This was a success from the first, and in latter years has had a capital of $1,000,000. It has built bridges all over the country, and structural frames for many public buildings in New York, Chicago, and other cities. From this time forward Mr. Carnegie's career has been a most successful one. He has become chief owner in the Union Iron Works, the Edgar Thomson Steel Works, the Homestead Steel Works, formerly a rival company, the Duquesne Works of the Allegheny Bessemer Steel Company, and several other iron and coke companies. The capital of these companies is about $30,000,000, and about twenty-five thousand men are employed. "In 1890 Carnegie Bros. & Co., Limited," says the _Engineering and Mining Journal_ for July 4, 1891, "had a capacity to produce 600,000 tons of steel rails per annum, or over twenty-five per cent of the total capacity of all the rolling-mills of the United States, while its products of steel girders, plates, nails, and other forms of manufactured iron and steel are greater than at any other works in this country, and exceed the amount turned out at the famous Krupp Works in Germany." The company has supplied the United States Government with a large amount of armor plates for our new ships, and also filled a large order for the Russian Government. The Edgar Thomson Steel Works have an annual capacity of 1,000,000 gross tons of ingots, 600,000 gross tons of rails and billets, and 50,000 gross tons of castings. The Duquesne Furnaces have a yearly capacity of 700,000 gross tons of pig-iron; the Lucy Furnaces, 200,000 gross tons yearly; the Duquesne Steel Works, an annual capacity of 450,000 gross tons of ingots. The Homestead Steel Works have an annual capacity of 375,000 gross tons of Bessemer steel and ingots, and 400,000 gross tons of open-hearth steel ingots. The Upper Union Mills have an annual output of 140,000 gross tons of steel bars and steel universal mill-plates, etc.; the Lower Union Mills, an annual capacity of 65,000 gross tons of mill-plates, bridge-work, car-forgings, etc. The industrious, ambitious boy was not satisfied merely to amass wealth. He had always been a great reader and thinker. In 1883 Charles Scribner's Sons published a book by this successful telegraph operator and iron manufacturer, "An American Four-in-Hand in Britain." The trip was suggested by Mr. Black's novel, "The Strange Adventures of a Phaeton," and extended from Brighton to Inverness, a distance of eight hundred and thirty-one miles.