338 Anthracite Coal of Pennsylvania. 
within the brick is 12 inches ; including the brick itis 16 inches.. 
It is formed of three cylinders of sheet iron, growing smaller 
and smaller, and standing vertically 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 
combustion, for there 1s no smoke, in the common sense of that 
word, and although this tube is 25 feet long, and most of it 
horizontal, there are only two joints where there is the least 
appearance of condensed water, and as this occurred but 
once, I am inclined 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 enly 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 be 
about an ifch in diameter, and nearly or quite that distance 
apart.) 
The fire is first kindled with charcoal, and when this is well 
ignited, the anthracite is added in pieces of the size of a fist, 
or larger ;and at first, only to the depth of a few inches. When 
this is kindled, which will happen in 15 or 20 minutes, more 
is putin, until the furnace is filled to the top of the bricks, or 
the bottom of the door—tless, however, as the weather is 
milder. 
The fuel may be added once in three, four, five, or six hours. 
according to the weather, and other-circumstances. It will 
need no other attention, than occasionally to stir the ashes, 
with a crooked poker, applied underneath, between the bars 
of the grate, or to runa straight one down to the bottom of 
the fire, to make a passage for the air, when the furnace is 
choked. ‘This is done most in cold weather; when it is very 
mild, it may be best to let the ashes accumulate, and then the 
fire will burn very gently and agreeably foralong time. _ 
The heat produced by.a stove or furnace,* of the description 
now given, Is very mild’and agreeable, without any oppress- 
ive effect, or any effluvium, except occasionally a trifling 
odour of sulphur, &c. for a few minutes when the furnace 
is recruited. ‘The temperature, in my apartments, is gene- 
®T havea similar stove in a convenient recess in the kitchen, which 
effectually warms that apartment and tempers the lodging rooms above, 
witile the consumption of wood fer cookery is the same as Im summer. 
