I scon] CURRENT IN A BUNSEN FLAME 123 



with a low temperature flame, while large ones were produced by a 

 hot flame. The curves resemble very closely in magnitude and in 

 form those obtained by Prof. H. A. Wilson and described in his book 

 on "The Electrical Properties of Flames." 



When the magnetic field was applied, the change in current was 

 feeble or null. Even when the rod was coated with a salt, although 

 the conductivity of the flame was greatly increased, the change due 

 to the magnetic field remained uncertain. This was due either to the 

 unsteadiness of the flame or to the weakness of the field which was 

 about 300 gauss. The currents employed were of the order of 10" 7 

 ampere. Professor H. A. Wilson has suggested that as the Hall effect 

 in a flame is proportional to the square of the magnetic field, it might 

 be a better arrangement to make the flame pass up the axis of a 

 vertical solenoid. The wire could be wound on a brass cylinder with 

 a double wall, through which water circulated to keep it cool, the 

 cylinder replacing the gauze as an electrode. 



