1/6 TJie Length of Flame in Explosions. 



but beyond a certain length of tube, any increase in its 

 length does not affect the projection of the flame. 



(3) With mixtures containing more than 8 volumes of air and 



I volume of coal-gas, a large increase in the length of the 

 tube attached appears to dimmish the extension of the 

 flame. 



(4) The mean projection of the flame under the most favour- 



able conditions is little more than equal to the length 

 of the column of explosive gases. Thus, in the case of 

 a mixture of i volume of coal-gas and 7 volumes of air, 

 disposed in a column 73*5 cm. in length, the mean 

 extension was 82 "3 cm. along a tube 155 cm. in length. 



The maximum projection of the flame observed was 

 105 cm. with the shorter firing-tube, and 158 cm. with the 

 longer firing-tube. In no case was the flame projected one 

 and a half times the length of the column of explosive gases. 



