370 



Chemical Examination of Bituminous Coal. 



c. Acetate of lead added gave no indication of sulphuretted 

 hydrogen. 



d. Sulphate of copper gave no indication of ammonia, 



e. The gas remaining in jar 1, after removal of carbonic acid 

 gas, having been generated at the lowest temperature, burned 

 with the clear, dense, yellow flame of olejiant gas. 



f. The gas remaining in the other jars, after the removal of 

 the carbonic acid gas, was entirely combustible, and burned 

 with a flame resembling that of a mixture of carbonic oxide and 

 light carburetted hydrogen. 



g. The volume of all the gases of/ and g was equal to 120 

 cubic inches, or 2425 parts. 



Ratio of carbonic acid, 80 cubic inches, 1600 parts : 2 

 " combustible gases, 120 do. do. 2425 " : 3 



h. The coke of No. 1, was very light, jet black, shining and 

 soft, and was not estimated because it was mixed with portions 

 of iron from the interior of the bottle. 



The following samples were coked for two hours in a draft 

 furnace, in covered Hessian crucibles. The coke was harder 

 than in the process in the iron bottle. Its color was jet black 

 internally, and gray at the top of the mass, where probably the 

 air had slight access, and was about twice the bulk of the coal 

 employed. 



The , coke of 2 and 5 was burned in a platina capsule over a 

 spirit argand lamp, till the carbon was all consumed. The results 

 are as follows in the table, reduced to centesimal proportions. 



No. 2. 53.5 grs. coal gave - - - - 33.8 coke. 



3. 63.5 " " . - . . 39.6 " 



4. 100. « " . _ _ . 67.6 " 



5. 200. grs. coal gave 128.45 grs. which for ^ = 64.2 " 



