Vol. X, No. 6.] An Improved Method of using Oil Gas. 221 



[N.8.] 



Experiment IX. 



Volume per cent of oil gas in mixture = 16*02 



a = 1814 sq. cm. 

 In this experiment it was found necessary to use a still wider 

 tube with a diameter of over 1*5 centimetres. 

 V 820 920 



T 845 



Tper" 100 cc." = 845 



Average time per 98*7 cc.= 169 sees. 



Hence R = 0*3 cm. per sec. 



Summary. 



1. "Oil Gas" requires 123 times its own volume of 

 air for its combustion, whereas coal gas requires only 5 to 5*5 



times its volume of air. 



2. It is owing to these facts that oil gas cannot be used 

 satisfactorily with ordinary Bunsen and allied types of burner, a 

 large percentage of the gas always escaping complete combus- 

 tion. 



3. A mixture of oil gas and air in equal volumes requires 

 for its combustion about the same volume of air as ordinary 

 coal gas and can be used for all purposes in the same way 

 as the latter with the various types of coal-gas burners. 



4. The calorific value of such a gas mixture is slightly 

 greater than that of ordinary coal gas. 



5. It is perfectly safe to mix this and even much larger 

 quantities of air with oil gas as the explosive limit is not 

 reached until over 80% of air has been added. 



6. By using the gas diluted in this way its complete 

 combustion is assured and not only do we get a gas far more 

 convenient for laboratory and other purposes but a very 

 considerable saving in expense is effected. 



7. A simple method of mixing air with gas has been 

 devised and Messrs. Mansfield & Sons are prepared to fix the 

 necessary attachment to their older form of apparatus. 



