Anthracite Coal of Pennsylsania. 351 
“ Gruexwicn Viniace, 8th Oct. 1825. 
“It 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 
Jacob F. Walters. We find that 37 Ibs. of Lehigh Coal will 
do as much work as two bushels of Virginia coal of good qual- 
ity. And also that the operation whi ch with Visine coal re- 
quires sixteen hours, is completed in eleven hours with t 
' high Coal. It may be used with advantage in most of the op- 
erations of Chymical manufacture.” 
(Signe EDWD. BIRCH, 
Foreman of the N. Y. Chymical Manufactory. 
ee 
“4 Memo dum ofan iment made with Lehigh and Vir- 
ginia Coal in the concentration of Sulphuric Acid (Oil of Vit- 
riol) at the Laboratory of the ot lel Manufacturing Com- 
pany at Greenwich villa 
I certify that I made fice in in two furnaces, one each of Le- 
high and Virginia coal, at 40 minutes past 2 . 
At 7 minutes before 5 P.M. Lehigh furnace 
iled—time required to boil being 2h. 13m. 
At 15 minutes before 6 P. M. Virginia furnace 
_ boiled—time required to boil being Sh. 05m. 
The process in the Lehigh furnace was completed at 12 
eis 9 hours and 20 minutes from the time of commence- 
ment, and the Virginia furnace was left unfinished at 5 o’clock 
next morning, being 14 hours and 20 minutes from the 
commencement—the time required to bring the fluid to 
oiling point, was o to its great specific gravity, requir- 
ing G00 de degrees of rive thie: sini cae iis 
"The fuel required for the above So was ast 
Virginia Coal at $9 per chaldron—26 cents per BE 3 
© bushel, 2 bushels and three-fourths i 
Lehigh coal at $9 per ton—40 cents 28 ardved:* a 
a ee say 
or Coal not consumed, sufficient to have kept the 
“Fetorts —— 2 hours, deduct - J 
— 32 
cents 38 
Difference in favour of Lehigh coal being more than 50 
r cent, 
OMan Te rit Oct. 8,1825. (Signed) JACOB F. WALTERS: 
