250 MINERALS FOfe THE PARIS EXHIBITION. G1LPIN. 



The Hub seam yielded 10,539 cubic feet of gas per long ton, 

 of which 55.46 per cent was used under the ovens. The average 

 calorific "power of the gas was 576.54 B. T. U. The average 

 illuminating value of the gas with a fishtail burner was 9.8 

 candle power, with a Welsbach burner 54. candle power. 



The average analysis of the gas was as follows : 



Hydrogen 50.7 per cent. 



Marsh gas 30.9 



Nitrogen. ....... 5.0 " 



Carbon dioxide .... 3.1 per cent. 



Illuminants 2.7 



Oxygen 2 



Carbon monoxide. .7.4 



Total 100.0 



The Phalen seam yielded per ton 32.91 Ibs. of ammonium 

 sulphate, and the yield from the Hub seam was 32.24 Ibs. In 

 commercial estimates a deduction of from 5 to 10 per cent 

 should be made for loss of ammonia during the process of con- 

 centration. 



The Phalen seam yielded per ton 12.89 gals, of tar, 128.9 Ibs., 

 and the Hub seam yielded 13.89 gals, of tar, 138 9 Ibs. The 

 Phalen seam yielded .103, and the Hub seam .111 gals, of 

 benzole. 



In considering the illuminating power and composition of the 

 gases given above it must be remembered that they are averages. 

 It was pointed out in my last paper that the gas obtained from 

 the first portion of the period of coking is much higher in illum- 

 inating power, etc., than that given off during the latter portion 

 of the period of coking. 



The General Mining Association. This company has a 

 large number of valuable coal seams, but has hitherto confined 

 its operations to one, known as the Sydney Main Seam. This 

 seam has been worked for over one hundred years, and still 

 remains one of the most valuable assets of the Province. The 

 average thickness of the seam is five fest two inches. The 

 annual output 271,000 tons. The portion of the seam now being 

 worked is entirely under the Atlantic Ocean, the samples 

 exhibited being taken from a point 2,200 yards from the nearest 

 land, and at a depth of 1,000 feet below the bottom of the ocean. 



