S84 NEW MIINERAL DISCOVERIES IN NOVA SCOTIA.—GILPIN. 
The yield of tar per long ton was 75.7 lbs., or 3.88 per cent. 
The following table shows its behaviour under fractional 
distillation :— 
Fractions. Leer Anne 
Tiioh prota. eee scsi es ee OU -t UU) 3. 
Niddlemoliae nents Ba ee oa ae he) 9.8 
Heavy Ol tee eerie eee 20-1 0 120 
Anat heierne nou eye sate ote cee AON AG PPATAD) 43 
Pitch: <canee Fs ES SEP eS ee Site es 67.0 
Water 5 Ae 245 Cer RE erg ae Se eee 45) 
oss. eee 5 Sh 2 a Bre aN Aro 9 
As the ultimate analysis shows 1.51 per cent. of nitrogen in 
the coal, and the .84 per cent. ammonia, 7.6 lbs. per long ton, in 
the gas liquor requires .28 per cent. nitrogen, it follows that 18.5 
per cent. of the total nitrogen in the coal is converted into 
ammonia, instead of usually 135 to 15 per cent. 
Three periods may be observed during the process of cok- 
ing, in the composition and value of the gases given off. At 
first the proportion of marsh gas (C H,) is high but gradually 
lessens. 
The following is the surplus gas produced during the first 
143 hours : 
Average calorific value......... 685.8 B.T. U. 
Average illuminating value...... 147 C. P. 
Volume perjong ton... ....o1.ce ola, (Ca Be 
The oven heating gas produced during the remaining 19 hours 
is as fullows: 
Averave scalontic. value ........ 500.( Bae 
Average illuminating value ...... 9:0 *CLE: 
Average per long ton. ..........5247.0 C.F. 
The gas during the last few hours is very low in calorific and 
eandle power, but owing to its carrying a large per cent. of 
hydrogen, it can after being purified, be enriched with benzole 
or oil vapors and be added to the first gas. Practically, however, 
the third gas is added to the oven heating gas, and the following 
table shows the composition of the two :— 
