APPARATUS FOR THE ANALYSIS OF GASSFS. Q \ 



attention to those observances, which are required id all de- 

 licate experiments on passes, and to the changing circum- 

 stances of temperature and pressure, this apparatus is fully 

 adequate to the purpose for which it is intended. It will be 

 easy, however, for those, who have the command of a suffi- 

 cient quantity of mercury, to adapt the apparatus to this 

 fluid. As an exemplification of the method of using it, in 

 the simplest possible case, I shall state the results of the 

 combustion of hidrogen gas. 



At the outset of the experiment, there was contained in Results of the 

 the receiver o o a quantity of hidrogen gas, equal, when j^?"** 1 "! of 

 reduced to a mean temperature and pressure, to 



15*8 cubic inches. 



Of these, there remained unconsumed 2*5 



Hidrogen gas burned 13*3 



In the receiver b were 49 cubic inches of oxigen gas, con- 

 sisting of 33-5 oxigen, 15'5 nitrogen 



At the close of the experiment, 



there remained, in b, 43*5 c. i. 



composed of 27'25 l6'25 



Cubic inches of oxigen gas con- 

 sumed 6*25 



But estimating from the first diminution (viz. 49 — 43*5} 

 only 5'5 cubic inches of oxigen would appear to have been 

 absorbed : and the nitrogen gas, by eudiometrical experi- 

 ments, would seem to have b<-en increased 0*75 of an inch. 

 As the hidrogen gas, however, had been prepared from zinc 

 and sulphuric acid with extreme caution, and did not con- 

 tain an appreciable quantity of common air, no such addi- 

 tion of nitrogen could have taken place. The apparent in- 

 crease, then, may be fairly imputed to the escape of 0*75 

 of an inch of hidrogen gas, which are to be deducted from 

 the 13*3 cubic inches at the outset of the experiment; and 

 hence the real quantity consumed will be 13*3 — 0*75 zz 

 12*55. The true consumption, also, of oxigen gas was 5*50 

 4- 0*75 — 6-25, or pretty exactly, as it ought to be, half 

 the bulk of the hidrogen, which was actually burned. 



An 



