48 



OF Calicite. — By W. J. Jackson, M. A. 



fll^ 



t. 





cfpirij 



A — Crystal K — Insulated Keys 



C — Mica Condenser P — Potentiometer 



E — Dolazalek Electrometer. 



Fig 2 



7. Effect of Time and Temperature on the 

 Conductivity. 



A constant E. M. F. of 300 Volts obtained from storage 

 cells, was applied to the crystal and the current was measured 

 by the electrometer at definite intervals. Table No. 1 gives a 

 typical set of readings, showing the decrease of current through 

 the crystal with time, and Curve "A," Fig. No. 3, shows the 

 data graphically. 





Table No. 1 





Time 



No. of Sees, per 





(Hrs.) 



100 Scale div. 



Current 







10.6 Sec. 



56.9 K 



2 



26.7 " 



22.5 K 



6 



32.8 " 



18.2 K 



10 



43 . 7 " 



15.1 K 



18 



52.6 ' 



11.4 K 



