B. - High-duty Apparatus. -
2. Blast-Furnace Blowing-Engines.-
(c) Vertical Blowing-Engines. Fig. 136 represents a type of compressor
employed in many localities in Pennsylvania. The inlet-valves
are placed in the extremities of the cylinders, and are provided
with springs so as to insure their rapid closing. The delivery-valves
are of leather. The cylinder is surrounded by au annular chamber.
The dimensions, etc., are as follows: Absolute air-pressure,
1.3 atmosphere. Volume of air at the pressure, 11,804 cubic feet.
Motor: Diameter of steam-piston, 43 inches; stroke, 47.1 inches;
two fly-wheels of 20 feet 4 inches diameter. Air-cylinder: Diameter
of piston, 83 inches; stroke, 46.8 inches ; useful volume of cylinder,
151 cubic feet; revolutions per minute, 50; volume generated per
minute, 15,345 cubic feet.