APPARATUS FOR THE ANALYSIS OF GASSES. 



and pressure, weighed 24*28 grains. Hence its specific 

 gravity was to that of atmospheric air as 783 to 1000. The 

 second product was much lighter, 100 inches weighing only 

 10'4 grains, and having, therefore, the specific gravity of 

 335. The results are comprehended in the following table. 

 The carbonic acid, stated to have been generated by the 

 second combustion, was formed by adding to an aliquot 

 part of the residue, after the removal of the carbonic acid, 

 a proportion of hidrogen gas ; detonating the mixture by 

 the electric spark; and proceeding as already directed. The 

 first two lines contain the minutes of actual experiments; 

 the third and fourth these results reduced to centesimal pro- 

 portion. 



93 



Spec. 

 Grav. 



783 

 335 

 783 

 335 



Cubic 

 inches 

 burned. 



Oxigen 

 gas con- 

 sumed. 



7*3 



9-8 

 100 

 100 



16-5 

 9*4 

 222 

 96 



Carbonic 

 acid ge- 

 nerated. 



Carb.ac. 

 fbrm'd by 

 2d com 

 bustion. 



8-3 



4-8 



113-7 

 49 



1-9 

 

 26 

 



Ox. con- 

 sumed by 

 2d com- 

 bustion. 



o-9 







12 







Total 

 oxigen 

 consum- 

 ed. 



17*4 

 94 

 234 

 96 



Total, 

 carbonic- 

 acid 

 formed. 



10-2 

 4-8 

 139-7 

 49 



proportions 



The early product of the gas from can n el coal, before xhe first pro- 

 being washed with lime water or caustic potash, is a mix- duct a mixture 

 ture of several different gasses, viz. carbonic acid, sulphu- ° 

 retted hidrogen, olefiant, and a fourth, which is either a gas 

 sui generis , or a mixture of carburetted hidrogen, and car- Onesuigene- 

 bonic oxide. To ascertain the proportion of these gasses in ns * 

 any mixture, is a problem of some difficulty. Sulphuretted Method of as- 

 hidrogen and olefiant gasses experience, it is well known, certaini ! 1 ^ their 

 an immediate condensation, when mingled with oximuriatic 

 acid gas, and in this way they may be separated from car- 

 bonic acid. Again, sulphuretted hidrogen and carbonic 

 acid are absorbed by liquid potash, which has no action on 

 olefiant gas. If, therefore, two equal portions of the gas 

 from coal be mixed with oximuriatic gas, the one in its re- 

 cent state, the other after being washed with potash, the 

 condensation of the former will be found to exceed that of 

 the washed portion. By the combined use of these agents, 

 we may attain an approximation, at least, to the proportions 

 in which carbonic acid, olefiant, and sulphuretted hidrogen 



g as 



