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THE COAL TRADE BULLETIN. 31
roof. The boiler plant consists of six Sterling boilers where the gases are being distilled. The
water tube boilers, each 405 horse-power, all equip- mingling of these elements in proper proportion
ped with the Jones underfeed automatic stokers, produces nearly perfect combustion, so that there
working very successfully (Fig. 2). is practically no smoke seen issuing from the
boiler stacks. The -writer con­
fesses to being very agreeably sur­
prised at seeing such scientific,
smokeless firing at a coal mine, and
those cities, whose atmosphere is
rendered filthy and obnoxious by
the wasteful and ignorant consump­
tion of the same fuel which is
burner] at this mine with scarcely
a sign of smoke, may well learn a
profitable lesson.
The power house is equipped with
one ten-ton Standard hand-power
traveling crane, 51 feet 1 inch span
from centre to centre of the bridge
wheel, and 2S feet lift, so arranged
that it can lift and convey any
piece of the machinery to any part
of the building. The electric power
is generated by two General E.ectric
generators, each 300 K. W. 550 volts
form H. direct connected, and run
by Harrisburg standard four-valve
automatic self-oiling engines. These
engines are of the best type, and
Fig. 2. Boiler Fronts and .Tones Stokers, Iselin Plant. are wen known as economical users
One of the most economical features of the of steam. Two dynamos are set, and the founda-
Iselin plant is the method used in conveying the tion is placed fer the third dynamo and third
slack coal to the bins in the boiler house, and engine. The haulage inside and outside of the
firing by mechanical stokers. As the
coal runs over the screens, the slack
drops on a belt conveyor and is conveyed
and automatically dumped into
the coal bins; from tne bins it runs
through spouts to the stoker hoppers
and by the stokers is put underneath
the boilers; thus from the time the
miner loads the coal, that portion of
it used for boiler fuel is handled only
by mechanical means, and in the most
economical manner. 1 he stokers are
automatic and can be regulated accord­
ing to the steam requirements.
At this plant, the Pittsburgh coal,
which has made the city of Pittsburgh
notorious for its smoky atmosphere,
is being burned underneath the boilers
in such a manner as to render it prac­
tically smokeless coal. This is accomplished
by means of the stokers,
the coal being fed tnrough and in a
retort under the fires, while the air is ^ig. 3. Ingersoll Sergeant Compressor at Iselin Plant.
admitted at an equalized pressure through the mines is done by electricity; the locomotives are
tuyere openings into the fuel bed at a point be- of the General Electric and Jeffrey Mfg. Co. types;
tween the green coal and that burning under the the main haulage motors weight 10 tons each.