380 Apparatus for Rapid Gas- Analysis. 



It is only intended to be used with mixtures of gases, containing 

 hydrogen, marsh-gas, and nitrogen, — the other ordinary consti- 

 tuents being determined in the absorption-apparatus. 



The following formulas are used in calculating the results of 

 the explosion of a mixture of hydrogen, marsh-gas and nitrogen, 

 or hydrogen and nitrogen. 



Let C = Contraction. D = Carbonic Acid : then, — 



2 C — 4D 



= Hydrogen. 



3 

 and D = Marsh-gas. 

 In the case of hydrogen and nitrogen the above formula be- 

 comes simply 2 C 



= Hvdrogen. 



3 



These calculations give the quantities of the above gases found 

 in the number of cubic centimetres of gas-residue used in the 

 explosion; it is of course necessary to calculate these upon the 

 total amount of residue left in the absorption-burette. The ni- 

 trogen is found by adding together the figures for the other 

 constituents of the gas and f.ubtnicting their sum from one hun- 

 dred. 



The subjoined table illustrates the character of the mixtures 

 of gases that can be analyzed Avith the above-described apparatus. 



Carbonic Acid 



3.4 



7.3 



0.0 



0.7 



Illuminants 



— 



— 



6.3 



15.6 



Oxygen 



0.0 



1.0 



.3 



1.5 



Carbonic Oxide 



40.2 



29.8 



6.0 



8.5 



Hydrogen 



44.9 



55.8 



— 



13.0 



Marsh-gas 





0.0 



— 



33.8 



Nitrogen 



11.50 



6.1 



— 



26.9 



With care, and a little practice with the apparatus, results are 

 obtained within a few tenths of a per cent, of the truth, and this 

 at an immense saving of time over the older methods of analysis 

 — the results answering every ordinary purpose in gas and metal- 

 lurgical works. After some practice, a complete gas-analysis, 

 using the absorption-apparatus and explosion-burette, can be 

 made in less than an hour. 



School of Mines. Netv York, 1883. 



