Showing stock house, blowing-engine house, etc. Plant consists of four furnaces 70 feet high, 18-foot boshet and 12-foot hearth. One furnace 90 feet high, 22-foot boshet and 11 feet 6 inches hearth. Blowing engines are of horizontal compound and horizontal vertical compound types, capable of blowing a pressure of 25 pounds of air. Four furnaces provided with fire-brick regenerator stoves 100 feet high and 18 feet in diameter. Large furnace has six stoves 100 feet high by 22 feet in diameter. Boilers fired with waste got from furnace. [Illustration: OPEN-HEARTH FURNACES.[38] (See page 415.)] [Illustration: CHARGING FLOOR OF OPEN-HEARTH FURNACES.[38] (See page 415.)] [Illustration: BLAST FURNACE STORAGE PLANT.[39] (See page 415.)] [Illustration: BLAST FURNACES.[39] (See page 415.)] [Illustration: 15,000-TON HYDRAULIC FORGING PRESS In all respects this press is the largest and most powerful forging press in the world. Water is supplied to the two plungers under a pressure of 7,000 pounds per square inch, giving it a maximum capacity of 15,000 tons. The columns supporting the cross-head are 14 feet 6 inches apart, and the working height under cross-head is 17 feet 1-1/4 inches. _Courtesy of the Bethlehem Steel Co._] [Illustration: DROP FORGE DIE SHOP.[40] (See page 421.)] [Illustration: VIEW OF A SECTION OF PROJECTILE FORGE SHOP.[40] (See page 421.)] [Illustration: FORGING HOLLOW HEAVY SHAFT.[41] (See page 421.)] [Illustration: OIL-TEMPERING HEAVY SHAFT.[41] (See page 421.)] DROP FORGE DIE SHOP. (See page 419.) This shop has a floor space of 20,400 square feet. With full equipment of most modern die sinking tools. VIEW OF A SECTION OF PROJECTILE FORGE SHOP. (See page 419.) This shop has a floor space of 22,000 square feet and is thoroughly equipped with the necessary hammers, presses, furnaces, etc., for the forging, punching, closing in, treating and tempering of all sizes of armor-piercing and explosive projectiles and shells. FORGING HOLLOW HEAVY SHAFT. (See page 420.) No. 22. The block has a hole bored through its center, and in this the mandrel is inserted, the tube being forged around it. The hydraulic pressure for this 5,000-ton press is furnished by Whitworth pumping engines. This department contains also a 2,500-ton press of similar design. OIL-TEMPERING HEAVY SHAFT. (See page 420.) Showing a shaft weighing about 33,000 pounds being taken from the vertical heating furnace and suspended over the oil-tank preparatory to being lowered for tempering. The heating furnace and oil tank are served by a sixty-ton traveling crane and forty-ton jib crane. The shrinking pit for assembling is situated between the heating furnace and oil tank. ARMOR PLATE MACHINE SHOP. (See page 423.)