Jinthracite Coal of Pennsylvania. 35i 
“ GREENWICH ViLLAGE, 8th Oct. 1825. 
‘¢ ft has been our custom to use Virginia Coal for concen- 
trating Sulphuric Acid ; but having determined to try Lehigh 
Coal, one of our furnaces was altered for that purpose by 
Jacob F. Walters. We find that 97 lbs. of Lehigh Coal will 
do as much work as two bushels of Virginia coal of good qual- 
ity. And also that the operation which with Virginia coal re- 
quires sixteen hours, is completed in eleven hours with the Le- 
high Coal. It may be used. with advantage in most of the op- 
erations of Chymical manufacture.”’ 
(Signed) EDWD. BIRCH, 
Foreman of the N. ¥. Chymical Manufactory, 
‘¢ Memorandum ofan experiment made with Lehigh and Vir- 
ginia Coal in the concentration of Sulphuric Acid (Oil of Vit- 
riol) at the Laboratory of the Chymical Manufacturing Com- 
pany at Greenwich village— 
I certify that I made fires in two furnaces, one each of Le- 
high and Virginia coal, at 40 minutes past 2 P. M. 
At 7 minutes before 5 P. M. Lehigh furnace 
boiled—time required to boil being 2h. 13m. 
At 15 minutes before 6 P. M. Virginia furnace 
boiled—time required to boil being 3h. 05m. 
The process in the Lehigh furnace was completed at 12 
o’clock, 9 hours and 20 minutes from the time of commence- 
ment, and the Virginia furnace was left unfinished at 5 o'clock 
the next morning, being 14 hours and 20 minutes from the 
commencement—the time required to bring the fluid to the 
boiling point, was owing to its great specific gravity, requir- 
ing 600 degrees of Fahrenheit, while water requires but 212. 
The fuel required for the above experiment was as under. 
Virginia Coal at $9 per chaldron—25 cents per 
bushel, 2 bushels and three-fourths - - - 7 
Lehigh coal at $9 per ton—40 cents per hundred 
weight—97lbs. say - - - - 40 
For coal not consumed, sufficient to have kept the 
retorts boiling 2 hours, deduct - - ° 
—32 
cents 38 
Difference in favour of Lehigh coal being more than 0 
per cent.” 
New York, Oct. 8,1825. (Signed) JACOB F. WALTERS. 
