AUTOBIOGRAPHY OF JOHN FRITZ 143
equivalent to sixty years as the great majority of engines run), and during aU these years they were blowing from ten to twelve pomids pressure and frequently more, notwith¬ standing the fact that they were so generaUy condemned by metallurgical engineers, and they are stfll running. Two of the oldest practical iromiiasters from the other side of the Atiantic, John Lancaster and Sir I. Lo\\'tliian Bell, were looking over the engines soon after they were started, and I ventured to ask what they thought of them. The former said that I had gone far in removing the objections in his mind to the horizontal blowing engine. Mr. Bell said they were certainly working beautifuUy, but that he would Uke to see them after they had been in use five 3^ears.
The result of the working of the two new furnaces was so satisfactory that I designed a new furnace, somewhat larger and higher, with some change in the lines, and with a blowing engine that would blow a pressure of twenty to thirty pounds. I had the foundation for the stack put in, but the caution of our directors was so great that they objected to the building of this new furnace, and much to my regret the subject was for the time dismissed from my mind. The advantage of higher pressure in blast-furnace practice, however, soon became apparent to practical furnacemen, and higher pressures were soon generally adopted.