174 



Mr. B. Lean and Mr. H. B. Dixon on 



(8) / volume of coal-gas with 14. volumes of air. 



(9) 7 volume of coal-gas ivith 16 volumes of air. 



With a, b, c, and d, the mixture was fired at the upper 

 end of the tube, but the flame was extinguished before the 

 end of the gaseous column was reached. 



Below we tabulate the mean extension of the flame in 

 centimetres along the several tubes, for the various explosive 

 mixtures, disposed in a column 73-5 cm. in length. Each 

 number in this table is the mean of 10 experiments. 



