Review of Prof. Johnson’s Report on American Coals. 325 
“In the analysis of specimen a, the moisture was found to be 0°74 
per cent., and that of 6, 0-914 percent. In the steam-drying apparatus 
28 peunds lost in three days only three ounces, or 0°6696 per cent. 
‘“* The sulphur in 6 was 2-282 per cent. 
** Of volatile matter, other than moisture, a had 34°72, and b 31:556 
per cent. 
‘¢ The coking took place with the emission of a beautiful bright flame. 
This indicated a large proportion of olefiant gas, and the absence of 
carbonic acid, or other incombustible gaseous matter. Two specimens 
tried by Dr. King gave a mean of 35°75 per cent. of volatile matter, in- 
cluding moisture. 
“The incineration of a produced 9°549, and that of b 5:48 per cent. 
of the raw coal. Hence the composition of the two may be thus repre- 
sented: 
Specimen a. Specimen 3. 
Moisture - - - - 0°740 
Sulphur - - - - (not tried.) 2°282 
Volatile combustible - - - 934:720 29:274 
Earthy matter - . - 9549 5:480 
Fixed carbon - - - - 54-991 62:050 
100- 100- 
Volatile to fixed combustible, 1: 1:584 1: 1:966 
“‘'The quantity of coal burned during the three trials of evaporative 
effect was 2918°5 pounds. 
“The waste matter withdrawn consisted of— 
Ashes, (including 1°982 pounds of wood ashes) - 175:25 pounds. 
Clinker > - - - a 26°25 > 
Soot - - - - - -' 1400 
The ashes lost by re-incineration - - 16°18 per cent. 
The clinker - - “ a 000 = =«« 
The soot - - : - = Ie SOLO), jet oe 
‘¢ Reducing the ashes and soot in these proportions, and deducting 
the wood ashes, we have left 277-4—1:932—275-473 pounds of abso- 
lutely incombustible matter, or 9°44 per cent. of the coal consumed. 
The trials in the large way show this coal to consist of— 
Moisture, from 28 pounds - - - - 0°6696 
Other volatile matter, from four specimens - - 33°4904 
Earthy residuum, from 2918-5 pounds - - - 9-4400 
Fixed carbon, by difference - > - - 56°4000 
100: 
The volatile is, therefore, to the fixed combustible as 1: 1:684 
Vol. xt1x, No. 2.—July-Sept. 1845. 42 
