sr. 6, Vol. 17. PI. 1/ 1. 



30 60 



Volts between 



1600 1400 __ 1200 



entiar^rje. 



3 hot carbon and the critical 



n the electrodes necessary to 



\ 3 millimetres between the 



Fig. 6. 



Hot. 



;ential between the carbons 



