AD Anthracite Coub of Pennsylvania. 
different from any other anthracites. They are apenren very” 
, in quantity inexhaustible, and accessible in the easi- 
est and least expensive*manner.* 
Tam not able at present to say any thing of much i pa ca 
tance, as to the Rhode Island anthracite. A quantity whieh 
had been promised to me for comparative experiment not 
having arrived, I have not been able to compare it with the 
Pennsylvanian anthracite, except as regards the gas. | hope 
to make these trials before the season is through, and cannot 
doubt that the Rhode Island coal will prove an important 
addition to our national resources, opeqel y with the aid of 
the practical pasate which has now been so extensively 
It is not necessary, as some. acippose, that a vik 
: | pass into a = which: is: tos be. warmed yaa will i in- 
of on circu 
lation of the airis quite sifcent without wm n,t and no 
es to see an iron tube pass through a handsome 
apartment. In future, ae who construct ‘houses, in situa- 
tions where the anthracite can be economically obtained, still 
do well to have reference to warming their apartments from a 
_ central situation. It is, however, necessary that thecommuni- 
cation from below with the chambers should’ pnw 
that it can be opened and shut at pleasure. If it cann ! 
sed, the lower rooms are occasionally chilled by the descent of 
the cold air from the apartments above, and taker are oc- 
easionally too much heated from below; but a door, like a 
valve in mechanics, enables us to preserve the equilibrium 
and wee shutting duors leading to other rooms, any one apart~ 
tment connected with the source of heat, may be immediately vy 
heated for use, and others if succession, as the 
cy are 
In houses having a hall through the middle, it is necessary 
_9See Mr. -Maclure’s remarks on this topic, aapeieos ccilacadle® 
} Direct radiation, very large room, ebiias aise 
aemieesly pewssfal tales the. shore are very sm) 
Pi ~ 
Ope! CE ee AE a ee Ll, Oe” eee 
