Prof. Johnson’s Report on the Bradford Coal Field. 141 
It contains of moisture, vaporized at 212°, - 1.3 per cent. 
OF water, tar, &c. disengaged in nares) - 65-.-" 
Uncondensable 8, - - - MS ic2 
Carbon, . i : oie FART 
Earthy matter, . - - - 6.73 .<% 
100.0 
“The ashes are of a rather deep chocolate brown, oe less marked 
in we particular than any of the red ashes of anthract 
“No. 7. This coal was obtained from the middle ai of the bed, at 
Mason’s mine, on the head waters of Wagner’s run. The coal from this 
mine, is aesay in the highest repute, both for domestic consumption, and 
for purposes of the arts. It has a specific gravity of 1. 
- It is composed of the following ingredients. 
Matter volatile at 390°, . - - 0.6 per cent. 
Vapors condensable, - i 
Ucondensable Larue matter, - - eee 
- - 8 Se 
Roe matter, - - - - 31. of 
00.0 
‘The ashes of this coal are white, slightly inclining to buff, moderately 
¥: | 
“No. 8. This coal is from the lower part of Mason’s bed ; it 
a columnar structure, the surfaces of deposition being distinctly marked, 
its color is deep black, surface of vertical fractures and lining. 
Its specific gravity is 1.400. a contains of 
Water lost at 340°, - - 2.1 per cent. 
oe matter expelled 3 in coking, - . 168 “ 
- - GB 57. ..5 
Battie matter, . - - . - 12 5e.. 
“The ashes of ‘iiasael onion tetias cake? rather inclining ant 
anil not remarkably heavy. — 
‘Experiments to detect the presence of sulphur succeeded in giving 
faint traces of that ingredient. 
“From all the analyses of coal detailed in this Report, we have the fol- 
lowing table of general results. 
Cart 
No. Volatile matter. ‘Earthy matter. 
1 15.0 ; z 22.4 
pacar cs aH 17.4 12.6 
3 y S? p39 19.1 17.0 
4 : “i Z 20.5 11.4 
Bice sedis 5 OBS 19.2 {16 
= 3 74.97 P 19.3 é 5.73 
9g : 0 a . ] 7.9 . 13.1 
8 68.57 18.9 12.53 
Mean, 67.83 18.41 13.76 
