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U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 135) The conveyor belts, however, have been removed, leaving only the steel framework for the conveyors and the motor-drive assemblies which powered them. The motors on the north and south sides of the hoist bucket pit are both 3 hp General Electric A.C. motors operating at 1740 rpm. Each motor is attached to a 3 hp Western Gear Strait Line gear motor. Installation Date: 1959. 7. Main Coke Breeze Conveyor: See I - A - 10 for description. Installation Date: 1959. 8. Control Room: The control room for the raw materials delivery system at blast furnace number 2 is located relative to the hoist bucket pit as is the control room at blast furnace number 1. It is the same size and contains equipment which performs the same functions as the control room at blast furnace number 1. Installation Date: 1953. 9. Counterweight Hoist Tower: The counterweight hoist tower is located on the east wall of the stockhouse just south of the hoist bucket pit. Rising to the level of hoist house number 2, it is made up of structural I-beam construction and is 5'-3 1/4" wide x 9'-l 1/2" long x 76'-6 3/4" high. The counterweight system consists of three pairs of 6*-l 1/4" diameter sheave wheels, one of which is located below the hoist house at a 45 degree angle. Construction Date: 1924. B. Hoist House: 1. Hoist House Building: Located approximately 15 ! -0" west of and on the centerline of the remains of blast furnace number 2, the hoist house building is 25'-9" wide x 42'-4" long x 18'-0" high from the floor to the underside of the truss. It is mounted on a platform supported by steel columns which extend 49'-6" above the trestle. The columns of the steel framed building are welded to steel plates which are bolted to the concrete floor. At the north and south end of the building are Fink roof trusses which support a gable roof. Its exterior is made out of corrugated metal. Construction Date: 1924. III. Blast Furnace Number Three: A. Stockhouse: 1. Stockhouse Building: See I - A - 1 for description.
U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 13 6) 2. Ore, Manganesef and Flux Scale Car: The construction, manufacture, relative location, and function of the ore, manganese, and flux scale car for blast furnace number 3 are exactly the same as its counterpart for blast furnace number 2. Installation Date: 1920. 3. Ore, Manganese, and Flux Bins: See I - A - 3 for description. Construction Date: 1920. 4. Coke Bin: The construction, relative location, and arrangement of the coke bin for blast furnace number 3 is the same as the coke bins for blast furnaces number 1 and 2 with the exception that the vibrating coke screens are made by a different manufacturer. The 60" wide x 120" long x 4" thick coke screen, which is inclined at angle of 20 degrees from the mouth of the weigh hopper openings, was manufactured by the Syntron Company. A 2 hp motor powers the vibrating coke screen. Construction Date: 192 0. Alteration of bin to fit Syntron Vibrating Coke Screen: 1969. 5. Skip Pit: Made up of concrete construction, the skip pit is 8'-l" wide x 14'-6" long x 20'-2 1/2" deep. Its centerline is located 40'-0" off of the eastern wall of the stockhouse and 259'-0" from the centerline of the hoist bucket pit for blast furnace number 2. Construction Date: 1953. 6. Skip Incline and Track: The skip track consists of a set of rails 5 f -8 1/2" apart which are mounted to a 9'-10 5/8" wide x 9'-0" high inclined bridge rising for a distance of 164'-9" to the top of the furnace along its centerline. The incline of the bridge is broken up into two segments. It rises at an angle of approximately 70 degrees to a height of 128'-3" where it becomes an approximate 58 degree angle to the top of the furnace. Design Date: 1952. 7. Skip Car and Carriage: A skip car (capacity level full = 267 cu. ft.) is mounted on a carriage which is set on the skip track leading to the top of the furnace. The steel plate constructed car is 5'-2" wide x ll'-7 1/2" long x 5'-4 1/2" high. Its carriage is made up of a front and rear rail wheel and axle assembly. The centerline distance between the front and rear wheels is 7'-0". The distance between rails is 5'-8 1/2". The stem of the skip car is mounted on a trunnion, located 3 , -3" from the rear of the car, and is connected to a 1 1/4" wire rope which is attached to the motor, drive, and winch drum assembly situated in the hoist house. The inside of the skip car, which is open at
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