Report of the Bureau of Mines of the Department of Internal Affairs of ...

No. 10. SECOND BITUMINOUS DISTRICT, 281
The outside improvement is a new lamp house, which has been built
of brick, and is located a short distance from the top of the shaft,
in which will be kept all safety lamps and supplies used in connection
therewith. Mine foreman, William Bainbridge.
Carbon Slope.—^Vt each examination of this mine, it was found in
satisfactory condition, both in regard to ventilation and drainage,
with 52,000 cubic feet of air in circulation per minute. Mine foreman,
Joseph Weightman.
At my request, Mr. James S. Mack, mining engineer for the Carbon
Coal Company, under whose personal supervision the plant was installed,
has furnished me the following description of Carbon Coal
Company's pneumatic haulage, which may be of some benefit to companies
contemplating a change in the method of haulage:
The plant consists of a "three stage" air compressor, and an eleventon
pneumatic locomotive, and a pipe line consisting of 3,000 feet of
6-inch, and about 100 feet of 4-inch, special wrought iron pipe.
The railroad is 40-inch gauge and has an average grade of 1.2 per
cent, and a maximum grade of 2.4 per cent, in favor of the loaded
cars, the road being almost straight except for two curves of 70 feet
radius, where it passes from No. 1 south main entry to No. 2 south
main entry, and one curve of 30 feet radius. The rails are 40-pound
steel, laid on 5x7 ties. The locomotive hauls a train of thirty cars,
the weight of each car being about 1,200 pounds empty, and 4,200
pounds loaded, a distance of 2,200 feet from foot of slope to the foot of
No. 9 southwest butt, and back 3,200 feet to foot of slope, with one
charging, making the round trip in from fifteen to twenty minutes, including
the time of changing trips and charging. The time required
for charging is from one to two minutes. It is expected that this
haul will be ultimately increased to 4,500 feet each way. The route
is out No. 1 south main e.ntry to the foot of No. 3 southwest butt and
then out No. 2 south main entry the remainder of the distance.
The compressor was made by the Ingersoll-Sergeant Drill Company,
of New York, and is of the straight line three-stage type. The
air is drawn into an intake cylinder twelve inches in diameter and
eighteen inches stroke, near the center of the machine, where it is
compressed to eighty pounds pressure and delivered hot through an
inter-cooler on top of the machine, consisting of an iron casing filled
with thin tubes, through which cold water is constantly circulating,
in which it is cooled and reaches the second compressing cylinder,
eight inches in diameter, in which it is further compressed to about
200 pounds then, sent through a second inter-cooler and finally compressed
to its final pressure of 800 pounds per square inch in a third
cylinder four inches in diameter, from which it is delivered through a
one and one-half inch opening to the pipe line. The sides and heads
of the first two cylinders are water jacketed to assist in reducing the