338 _ Anthracite Coal of Pennsylvania. 
‘within the brick is 12 inches ; acorn * the brick itis 16imches- 
Tt is formed of three cylinders of sheet iron, growing smaller 
and smaller, and standing santos) one on another, to the 
height of about 6 feet. A tube, of 4 inches in diameter, goes 
off from the top, to conduct away the gases produced by the 
epmbustion, for there is no smoke, in the common sense of that 
word, and although this tube is 25 feet long, and most of it 
horizont al, there are only two joints where there is the least 
appeara ince of condensed water, and as this occurred but 
once, I am inélined to attribute it to some other fuel which 
was put into the stove, wood having been a few times used. 
The supply of air is through the ash-pit, which is furnished 
with an iron drawer to receive the ashes, and the front of this 
is pierced with register holes to regulate the admission of air. 
When the drawer is shut, the air passes in only through those 
holes, and when a greater supply is needed, the drawer is pull- 
ed out to any desired degree. ‘The bars of the grate should he 
about an inch in diameter, and nearly or quite that — 
Phe fire is first kindled with charcoal, and when this is veil 
ignited, the anthracite is added in es “* — size me 
or larger; and at first, only to the depth ofa w inches. W 
this is kindled, tbe will happen in 1, sor 20 minute, on 
is f in, until th e furnace is red thie vena ted 0 
ttiom of the door—less, however, as’ the weather is 
the bottom 
milder. 
o The fuel may be added once in three, four, five, or six hous 
according to the weather, and other circumstances. It will 
need no other att ention, than eccasionally to stir the ashes, 
with a erooked poker, applied underneath, between the bars 
of the grate, or to runa straight one down to the bottom of 
— fire, to make a passage for the air, when the © —_ 
hoked. This is done most in cold a when it it is vei 
pony, tr mt 
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