218 



Mr. F. W. Barrett on Sensitive Flames. 



clasping the root of a. This small lower divergence appeared to 

 be due to the shape of the burner, and its presence will be neg- 

 lected. The plane of the divergent flame is uninfluenced by 

 Tig. I. Fig. 2. 



Fig. 3. 



the direction of the sound, but depends entirely on the position 

 of the burner, and moves with it. 



I now sought to find how far the effect was influenced by the 

 size and shape of the burner whence the gas issued. Burners 

 were formed of glass tubing drawn out and the points broken off 

 so as to obtain orifices of various sizes. Flames of different 

 length and volume were thus produced. Sensitiveness was only 



