BLOWING OR BLAST ENGINES.
Dimensions of a Furnace, Engines,
At Lonakoning (Md.).
Furnace. Diameter at the boshes 14 feet, which fall in, 6.33 inches in every foot
rise.
Engine (Non-condensing}. Diameter of cylinder 18 inches, length of stroke 8 feet.
Revolutions. 12 per minute, with a pressure of 50 Ibs. per square inch.
Boilers. Five : each 24 feet in length, and 36 inches in diameter.
Blast Cylinders. 5 feet diameter and 8 feet stroke.
At a pressure of from 2 to 2¿ Ibs. per square inch, the quantity of blast is 3770
cubic feet per minute, requiring a power of about 50 horses to supply it.

At Mount Savage (Md.).
Far Blowing four Furnaces, 14 feet in diameterì each making 100 tons
of Pig Iron per week.
Engine (Condensing}. Diameter of cylinder 56 inches, length of stroke 10 feet.
Revolutions. 15 per minute. Pressure. 60 Ibs. per square inch, cut off at 1/4 of
the stroke.
Boilers. 6 of 60 inches in diameter, and 24 feet in length, with 1 22 inch flue in
each, double returned. Grates. 198 square feet.
Blast Cylinder. 126 inches in diameter by 10 feet stroke. Revolutions. 15 per
minute. Pressure of Blast. 4 to 5 Ibs. per square inch.
Area, of Pipes. 2300 square inches, or | that of the cylinder.
For Blowing two Furnaces and two Fineries, making 240 tons of
Forge Pig per week.
Engine (Non-condensing). Diameter of cylinder 20 inches, length of stroke 8
feet. Revolutions. 28 per minute. Pressure. 50 to 60 Ibs. per square inch (full
stroke).
Boilers. 6 of 36 inches in diameter, and 28* feet in length (without flues).
Orates. 100 square feet.
Blast Cylinders. 2 of 62 inches in diameter by 8 feet stroke. Revolutions. 22
per minute. Pressure of Blast. 2 1/2 Ibs. per square inch.
Area, of Pipes. 3 feet, or | that of the cylinders.
One Blast furnace has 2 3 inch and 1 3 1/4 inch tuyeres : the other has 3 of 3 inches.
One Finery has 6 tuyeres of 1 1/8 inches, and the other 4 of1 1/8 inches.
The ore yields from 40 to 45 per. cent of iron. The temperature of the blast is
0000. *
40 feet would have afforded much economy of fuel.