478 P. W. Wood, Jr. — Combustion of Gas Jets. 



sure. Pressure 2 cms — Flame reduced to a height of 20 

 hissed perceptibly. Pressure 3 cms — Its length about 17 

 roared loudly, and a contracted place appeared 4 cms from the 

 orifice, fig. 2 b). Pressure 5 cms — Flame reduced to 15 cms , the 

 contraction approached within l*7 cms of the orifice. Color, blue 

 for the most part, a little yellow at the tip, very little luminosity. 



ns ; it 



Tib.2- 



Pressure 7 cms — Yellow tip all gone ; small broken spaces ap- 

 peared in the flame beyond the contraction ; resembled the flame 

 of a Bunsen blast lamp and was about as hot ; glass could be 

 worked in it as easily as in the blowpipe flame (fig. 2 c). Pres- 

 sure 10 cmB — A large break appeared in the flame just beyond 

 the contraction ; the flame beyond united with that below by 

 a mere thread (fig. 2 d). Pressure ll cms — Flame beyond the 

 break alternately went out and relighted with a snapping noise, 

 showing that it was an explosive mixture of gas and air. 



