146 Mr. R. Beattie on the 



Fig'. 4. — Platinum and Carbon Poles. 



30 



a 20 



be 15 



W 10 



CL. 





-o^^- 



1 



fW 









\9 



















?A 





















i 

















C^> 





























•4 -6 -8 1-0 



Capacity in microfarads. 



Fig. 5. — Copper Poles. 



20 



"8> 









■ — ^#£ 



^? 















7 











































































•4 -6 -8 1-0 



Capacity in microfarads. 



