TJie Length of Flame in Explosions. 171 



(1) / volinne of coal-gas with ^ volumes of air. 



This mixture could not be exploded in the firing tube. 



(2) I volume of coal-gas tvith 5 volumes of air. 



The linear extension of the flame is stated in centimetres. 



(3) I volume of coal-gas zvitJi 6 volumes of air. 



Mean... 7 -9 31-5 71-3 79- 



Max. ...12 41 91 102 



Mim...<6 < 6 31 50 



Note. — In calculating the mean, < 6 cm. is reckoned as 5 cm. 

 M 



