B. Silliman on Wollongongite. 91 
At the end of the second hour from the commencement of the 
last charge the operation was closed, giving an average pro- 
duct for each charge of 1470 cubic feet of gas, or a yield of 
7°35 cubic feet for each pound of the mixture employed. As 
by former trials I had determined the value of the Westmore- 
land coal alone, by the Hydro-carbon Process, to be 6:27 cu- 
bic feet of gas, it ‘pllawe that the increase of 1-08 Tabi feet 
of gas is due to the average addition of 7$ per cent of the wol- 
longongite. 
The yield of gas per one ton (2240 lbs.) of such a mixture 
would therefore be 16,464 cubic feet. 
The illuminating "Power of the Gas e illuminating 
power of the gas in these experiments was ‘ascuehiinnd by the 
Bunsen Photometer in the usual manner. 
From the two first charges of 5 per cent of wollongongite 
_ and 95 per cent of Westmoreland coal the corrected result of 15 
_ observations gave an illuminating power of 18°79 candles. 
_ From the charges containing 10 per cent of wol- 
__ longongite the illuminating power was i | 
Average power for whole quantity containing an 
average of 72 p. c. of wollongongite, ‘88 
These results are given for the usual standard of A cubic feet 
_ of gas burned in one hour in an Argand standa ; 
he total economical effect of a mixture containing ten per 
cent of wollongongite is Leh stated in the quantity of spermaceti, 
_ equivalent to one ton (2240 Ibs.) of such a sea which in 
<4 
this case is found to be 1774:°9 Ibs. 
_ The Westmoreland coal alone when treated by the 
same process yields a total economical effect, waru 
_ Gain of total economical effect due to the use of 
_ _ 10 per cent of Wallongongite, 977°3 
_ Equivalent to 221,°, per cent gain. 
_ As the yield of gas per ton of this mixture is 16464 c. f. 
And Westmoreland coal alone by same treatment, 14057 “ 
It is evident that 72 per cent of eonyeagite (or 
ce 
168-2 lbs.) have yielded gas, 2407 < 
This quantity Oni 168°8) corresponds to 14:31 cubic feet 
_ of gas to the pound of material. When treated alone by the 
_ common process the Se acie yields as already stated in 
_ the former part of this paper, 6:11 cubic feet per pound. 
| There is an increase ba gi of 232,5, per cent in the volume 
of the gas obtained from the wollongongite under the influ- 
ence - the hydro-carbon process. It is evident therefore that 
