B. Silliman on Wollongongite. 89 
ploration free to a greater degree of the contaminating ‘ash,’ 
and in that case we may expect to see ittassuming a more or 
| less transparent honey or wax yellow aspect, such as it now 
_ shows in thin shavings under the microscope. 
I should remark that the illuminating power of the gas 
from the wollongongite was determined upon its — 
yield of nearly 14000 cubic feet to the ton of 2240 Ibs. Had 
the yield been restricted to 10,000 cubic feet it is quite proba- 
ble its illuminating power would have been at least 150 candles 
_ for 5 cubic feet. This opinion is based on comparative results 
_ obtained with the albertite of New Brunswick. The maxi- 
- maum yield of gas from this remarkable material is per 2,240 
_ pounds, 15,000 cubic feet with an illuminating power of 58°14 
4 candles, But when the yield 65f gas is restricted to 10,000 
_ cubic feet per ton of 2,240 pounds the illuminating power 
| rises to 70°38 candles, The amount of coke left by one ton 
_ of albertite is 946 pounds corresponding very closely to the 
Emule of of analysis in a platinum crucible which show for 100 
parts : 
Volatile matter, - : - = - 570 
Fixed carbon, - - - - - - 42°5 
Ash, - > - te . 0°5 
100°00 
This ration would require 963 pounds of coke, as near an 
approach as tae ey in the large way can be expected to 
give, being within 1°76 per cent, The quantity of sulphur in 
the albertite is less than in the wollongongite, the number of 
cubic feet of the gas from the former completely purified by one 
_ bushel of ime being 9025 against 5686 feet of the latter. 
At — the gas from the albertite lost 34 per centof its 
illuminating power, 
_ Tam indebted to J. A. Sabbaton, engineer of the Manhat- 
tan Gas Light-Company, New York, for the facts here given 
as to the technical value of the albertite, being the results of a 
recent determination, called out by the ‘remarkable facts fur- 
nished by the wollongongite 
New Sie. May 19, 1869. 
June 3, 1869.—Since the foregoing was in press I have had 
opportunity to test the value of the wollongongite, by the 
ydro-carbon Gas Process, en the following results. 
‘A mixture was made of 5 per cent of wollongongite with 95 
per cent of bituminous (caking) coal of Westmoreland, Penn., 
the value of which coal when treated slot by the same ’ process 
had been previously determined, Of this mixture charges of 200 
‘pounds each were employed, and es total yield of gas after 
