i er oe ge 
hithravite Couk of Pennsylounies 39 
tally from 65° to 72° or 7s" of Faht. Itisnot dificult to raise 
the heat ~highers 5 but in winter weather, a ly 
ps high enou h, set h for 
and comfort. The temperature i is very nearly equal through 
the whole of the apartments warmed, and often sii, hours 
scarcely varies a degree or two; at least thi e of the 
parts that are not warmed immediately by the si es da 
@ room warmed by a common fire-place, it is not unusual for 
the temperature of 80° or 85° to exist immediately before the 
_ on: neti 40° or 45° or 50° in the remote parts of the 
Lisa common error to suppose that an atmosphere, 
aly anne mad warmed, exposes pores: to take 
we continue acne opt Pro} we are wernt cote evenit 
peinigcke Ani 31, 1826, the thermometer has gradually ig 
sin © below,? while the tem mperature of the 
has — _ for three hours—but there is no wind, and there 
- is no fire on the hearth, the fire-board being shut asia sum» 
mer. The adding of more fuel depresses the thermometer a 
little until.the fire burns actively again. 
There is some difference of opinion as to the oomparanee 
value of the Lehigh and Schuylkill coal. The 
e , and although there are points of ‘difference, a 
eS -ailngh -be invidious. A correspondent 
date of Jan. ty. 1826, writes thus, respecting the Lehigh coal. 
« The structure of the Lehigh coal is more. dense and com- 
pact, and consequently as the heat is less rapidly absorbed, 
it does not ignite quite so readily, as the Schuylkill ; it makes 
less ashes, enduring from 15 to 20 per cent. lon er, and pro- 
es a. more intense heat than can be produced by any other 
known fuel, It is, generally speaking, free from sulphur, a 
of great importance to malsters, iron workers, &c. Some 
experiments have been made in smelting iron with it and 
charcoal mixed, but with various success. Some think the 
is so great as to burn up a portion of the iron, 
No theory has. yet been formed - any value, nor will there 
be perhaps for some time to com AS 
* At ‘ei Weleck, F . M. it was 11° below @. 
