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 diameteŕ 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.