86 Anthracite Coal of Rhode-Island. 
not, however, be more than the coal can thoroughly absoris 
and decompose, for any thing beyond this, would be injuri- 
ous, by diminishing the combustibility of the fuel. I find, 
however, that after being thoroughly wet with rain, it burns 
ly. 
4. The heat produced by thesRhode-Island anthracite is 
intense. ‘The season being so far advanced, I have not been 
able to compare it exactly, in this respect, with the Pennsyl- 
vania anthracites, and cannot positively say, that it produces 
as much heat as the purest of those varieties of coal; but 
when it is burning with great activity, I cannot discover any 
material difference, as far as the sensible appearances, or the 
effect on the air of the apartments, would afford a criterion by 
which to judge. It is certain, that the heat is very great, 
and I have no doubt that it will be sufficient for every pur- 
pose of domestic economy, and of the arts, to which it may 
be applied. 
5. The gas emitted by the Rhode-Island coal, is light car- 
buretted hydrogen, mixed, of course, with carbonic acid gas. 
ab. not observed any odour of sulphur, when the door 
is opened to throw in more fuel, and even when I injected 
water upon the highly ignited coal in the furnace, (as already 
related) although the flame burst forth into the room, and fil- 
it with ashes, there was no smell of sulphur ; the odour 
was simply that of light carburetted hydrogen, and I have 
constantly observed this to be the fact whenever any smell 
vein Te 2S 2 SS: es 
I cannot say, that none of the varieties of this coal will 
give a sulphureous smell, but I have never observed it. 
It is stated by a correspondent, that having an entry stove, 
the tube of which, being without a cap and passing out at the 
window of a third story, was liable to be acted upon by the 
wind, the current was thus, ona particular occasion, reversed ; 
remained for some 
slightly disagreeable.” A similar. 
nace was charged with Lehigh coal, produced so di agreea- 
ble a smell, that it became necessary to ventilate the beiaioes 
ae his dif kinds 
coal, I have observed: where there is a ood draft, it is of 
baits § 8 eee Bec 
nO at uportance, and where there is an intermitting 
