the Combustion of Gun-cotton and Gunpowder. 277 



obtained, corresponding to 2*0786 grms. of potash. Hence 100 

 grms. of ordnance powder contain 33*85 grms. of potash, which 

 agrees closely with the result of the direct analysis of the powder. 

 After finding, by direct observation, that 36*8366 grms. of the 

 powder furnished 7621*9 cubic centims. of gas, the composition 

 of the products of combustion of this powder may be stated as 

 follows : — 



Sulphate of potash 13*61 



Carbonate of potash .... 7*14 



Hyposulphite of potash . . . 1*04 



Sulphide of potassium .... 0*04 



Charcoal 0*94 



Sulphur 1*73 



Sesquicarbonate of ammonia . . 0*99 



Nitrogen 3*60 



Carbonic acid 6*40 



Carbonic oxide 0*97 



Hydrogen 004 



Sulphuretted hydrogen . . . 0*10 



Marsh-gas 0*15 



Loss 007 



36*82 



in which sulphur and charcoal are calculated from the deficiency. 



(b) Small-arms Powder. 



34*153 grms. were used for the combustion. The quantity 

 of the gaseous products was obtained from the following gaso- 

 metric experiments : — 



Absorption Analysis. Vol. at 0° 



and 1 metre 

 Volume. Pressure. Temp, pressure. 



Original volume .... 136*94 0*6331 22*1 80-21 

 After absorbing CO 2 and SH 75*04 0*5024 21*9 40*46 



If the solution of the potash-bulb is determined with solution 

 of iodine, it is found that 0*535 division corresponds to sulphu- 

 retted hydrogen, from which it follows that the above quantity of 

 gas consists of — 



Carbonic acid 39*22 



Sulphuretted hydrogen . . . 0*53 

 Combustible gases and nitrogen 40*46 



80*21 



The explosion analysis with the transferred gas gave — 



