The Electrical Conductivity 



51 



Fig. No. 5 shows a typical Current-time curve and also the 

 corresponding depolarization curve. If a line XY is drawn as 

 shown in the figure and the area under the curve "A" down to 

 that line measured it is seen to be approximately equal to the area 

 under the curve A' (down to OX) which is the corresponding 

 depolarization curve. Curves B and B' also show the same 

 phenomena. Other curves obtained, of which those in Fig. 

 No. 5 are typical go to show that there is a displacement as well 

 as a conduction current. 



///. Directional Conductivity 



In crystals No. 1 and No. 2 the conductivity in opposite 

 directions was found to be different. Miss Levi* found similar 

 results for diamond crystals. Curves "A" and "B," Fig. No. 

 5 show the relative values of the current through the crystal 

 in opposite directions. Positive and Negative potentials were 

 applied to both sides of the crystals alternately; the electro- 

 meter was also connected to the opposite side of the crystal. 



* Proc. Roy. Soc. Canada. XVI. Page 95; 1922. 



