obtained in the Decomposition of OH. \ 95 



Oil Gas from Gordon's Lamp. dimin. 



sul. acid 15' ;{0' 3 hours, per cent. 



214 vol. + 6-8 vol. diminished to 183-3 180-8 176-0- 17-75 



159 + 5-9 137-5 1360 130-4 17-98 



113 + 12-2 980 96-0 92-0 18-58 



Coal Gas of poor Quality. 



548-6 -I- 27-6 533-3 529-2 5290 3-57 



273-6 + 27-8 267-9 266-0 266-0 2-78 



190-6 +13-1 186-0 184-2 1841 3-41 



Oil may also be used in a similar manner for the separation 

 of these vapours. It condenses about 6 volumes of the most 

 elastic vapour at common temperatures, and it dissolves with 

 greater facility the vapour of those liquids requiring higher 

 temperatures for their ebullition. I found that in mixtures 

 made with air or oxygen for detonation, I could readily se- 

 parate the vapour by means of olive oil; and when olefiant 

 and other gases were present, its solvent power over them was 

 prevented by first agitating the oil with olefiant gas or with 

 a portion of the gas to saturate it, and then using it for the 

 removal of the vapours. 



In the same way some of the more fixed essential oils may 

 be used, as dri/ oil of turpentine ; and even a portion of the 

 condensed liquor itself, as that part which requires a tempera- 

 ture of 220° or 230° for its ebullition ; care being taken to 

 estimate the expansion of the gas by the vapour of the liquid, 

 which may readily be done by a known portion of common 

 air preserved over the liquid as a standard. 



With reference to the pi'oportions of the different substances 

 in the liquid as obtained by condensation of oil gas, it is ex- 

 tremely diflRcult to obtain any thing like pi'ecise results, in 

 consequence of the immense number of rectifications required 

 to separate the more volatile from the less volatile portions ; 

 but the following table will furnish an approximation. It 

 contains the loss of 100 parts by weight of the original fluid 

 by evaporation in a flask for every 10° in elevation of tempe- 

 rature, the substance being retained in a state of ebullition. 

 100 parts at 58° parts, differences, 



had lost at 70 ... 1-1 



80 . . . 3-0 l^ 



90 . . . 5-2 II 



100 .. . 7-7 II 



110 .. . 10-1 ^* 



120 .. . 13-2 ^'; 



130 .. . 16-1 ^l 



UO . . .19-3 g.j 



Rl)2 150 



