278 On Spark Potentials in Liquid Dielectrics. 



Again, as in Mr. Earhart's results, the " knee " occurs at 

 the same voltage as the " knee " for air, which in my appa- 

 ratus is 300 volts. But for Mr. Earhart's paper probably I 

 should not have noticed this peculiarity in these curves. 



400 

 300 







4 



if 



Mf 



1 



^ 200 





7 t 

 ll 



// 



/ IS/' 



/ % ^ — 



/ / s 





k uu 

 100 





///// 



// Ay 



V 



















of 







•> 5 



5 i 



V i 



6 



Microns. 



The " knee " is not distinct as for air ; and since all sparking 

 distances are very uncertain it is natural to draw a line 

 roughly through the plotted points and to disregard variations 

 from the straight. 



Though this "knee" seems to be established for some 

 cases I am not convinced that it is true always, e. g. for 

 olive oil, codliver oil, hexane, and octane, under the conditions 

 of my experiments. 



