Still another by-product of the steel industry, and one that means material profits from waste, is Portland cement. In this is utilized blast furnace slag, formerly not merely a waste but a source of expense as it had to be freighted away from the mills and “dumped.” The manufacture of cement from slag had been carried on before the Steel Corporation was formed by the Illinois Steel Co. but only in a small way. The big company extended the cement industry as a side line to steel and erected several new plants, the largest being at Buffington, Indiana. It now has a capacity of about 45,000 barrels a day. Greater earnings for the Corporation, larger profits for its stockholders, are represented by the extension of the manufacture of these by-products. But, beyond this, the cultivation of this part of the industry means an appreciable reduction in the cost of manufacturing steel, and consequently lower prices to the consumer and the possibility of higher wages to the worker, as well as the elimination of waste and the conservation of the natural resources of a continent. Besides integration and the achievement of economies the early history of the United States Steel Corporation is largely a narrative of expansion, the building of new plants, and the acquisition of other companies. First of these acquisitions was the purchase, consummated about a month after the Corporation was organized, of the Bessemer Steamship Co., a Rockefeller concern engaged in traffic on the Great Lakes and which had been closely affiliated with the Lake Superior Iron Mines. This company had a fleet of 56 vessels (included in the number of vessels given as taken over by the Corporation in a previous chapter). The new organization paid $8,500,000 for the stock of the company, or about $150,000 for each vessel of the fleet. In the same year control of the Shelby Steel Tube Co., a New Jersey company owning the principal basic patents for the manufacture of seamless tubes, and having an outstanding capital of $5,000,000 of preferred and $8,150,000 of common stock, was secured, the exchange of securities being made on the basis of one share of U. S. Steel preferred for 2⅔ shares of Shelby preferred, and one share of Steel common for four shares of Shelby common stock. Practically all the stock of the Shelby company--$4,776,100 preferred and $8,018,000 common--was acquired, giving the Corporation a substantial controlling interest. In 1901 also the Corporation purchased by exchange of stock one-sixth interest in the Oliver Iron Mining Co. and the Pittsburgh Steamship Co. The Carnegie Steel Co. already owned the other five sixths of the securities of both these concerns and this gave the Corporation complete ownership.