Mr. A. A. C. Swinton on High Frequency Discharges, 303 



form have much greater moments about the line Ot than 

 figures of the same area of flatter form. 



The shaded figures represent equal quantities of electricity. 

 The distances of the centres of gravity from the line Ot repre- 



t= time 



sent the heating-powers, which are proportional to the mean 

 volts during each impulse. 



The converse, of course, follows, that if the heat he constant 

 the quantity of electricity is inversely proportional to the 

 mean volts during each impulse. 



The above is on the assumption that the effects of self- 

 induction are negligible, as is probably the case with small 

 lamp filaments. Where, however, self-induction does exist a 

 similar effect is produced owing to the increased resistance 

 due to this self-induction, as the writer has already suggested. 



The same explanation would also apply to the intense heat- 

 ing-effects of sparks, lightning flashes, and other disruptive 

 discharges in which the quantity of electricity is apparently 

 small. 



