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 5, 0°914 per cent. In the steam-drying apparatus 
28 pounds lost in three days only three ounces, or 0°6696 per cent. 
“* The sulphur in b was 2-282 per cent. : 
“Of volatile matter, other than moisture, a had 34-72, and } 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 } 5:48 per cent. 
of the raw coal. Hence the composition of the two may be thus repre- 
* 
sented : 
Specimen a, Specimen 5. 
Moisture - - - - 0-740 0-914 
Sulphur - - : - (not tried.) 2°282 
Volatile combustible - - - 84°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“The waste matter withdrawn consisted of— 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. 
j - - - 12625 *“ 
Clinker : a 
oot «= KS « a z Fi 14-00 ce 
The ashes lost by re-incineration - - 16°18 per cent. 
The clinker - - - - - 0-00 2 
The soot - - - - - 56°75 
“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 - - - 94400 
Fixed carbon, by difference - - : - 56°4000 
The volatile is, therefore, to the fixed combustible as 1: 1684 
Vol. xxix, No. 2.—July-Sept. 1945. 42 
