g± APPARATUS FOR THE ANALYSIS OF GA5SF.S. 



gas are mingled with the aeriform product of coal. The 

 General rule, rule may be stated as follows; to a measured quantity of 

 oximuriatic acid gas, contained in a graduated tube, add 

 twice its bulk of the recent coal gas, and at the expiration 

 of one or two minutes observe the diminution which has 

 taken place. Wash an equal quantity with caustic potash ; 

 note the loss ; and submit the residue to the action of oxi- 

 muriatic acid as before. The second diminution, thus ef- 

 fected by oximuriatic gas, divided by 2*2, gives the propor- 

 tion of olefiant gas. Deduct this absorption from the first, 

 and, dividing the remainder by 1*8, we obtain the quantity 

 of sulphuretted hidrogen. Lastly, to know the quantity of 

 carbonic acid gas, subtract, from the diminution effected by 

 potash, the amount of the sulphuretted hidrogen gas. An 

 example, taken from actual experiment, will best explain 

 the application of this rule, 

 practical appli- One hundred measures of the first product of gas from 

 nation of it. cannel coal lost, by agitation with liquid potash, 9*7 mea- 

 sures. The remainder, being mingled with one fourth its 

 bulk of oximuriatic acid gas, the mixture lost 10*4 measures. 

 This diminution, 10*4, divided by 2*2, gives 4*9 for the 

 proportion of olefiant gas. But 100 measures of the un- 

 washed gas sustained, by admixture with oximuriatic acid, 

 a diminution of 20 measures. Now, deducting, from this 

 diminution, that occasioned by the condensation of olefiant 

 -gas (viz. 20 — 10*4), there remain 9*6, which, divided by 

 1*8, give 5*3 for the proportion of sulphuretted hidrogen 

 gas. And the diminution by potash (=9*7) — 5*3 gives 

 4*4 for the proportion of carbonic acid gas. Hence 100 

 measures of the first product of gas from cannel coal con- 

 tain, 



First g:* from 1. Of inflammable gas, not affected by the 



« ftael cu * 1 ' foregoing agents 85*4 



2w Of sulphuretted hidrogen gas • 5*3 



3. Of olefiant gas 4*9 



4. Of carbonic acid gas t ...... . 4*4 



100 



The 



