Electrical Conductivity of Atmospheric Air. 705 



Tests of the conductivity were made both with and without 

 the tin and lead linings. Before each test the cylinder was 

 well aired and sealed in the manner already described. As 

 soon as the air was inclosed, measurements on the conductivity 

 were begun and continued at stated intervals as before. 



Table II. 



Time. 



Current : Arbitrary Scale. 



Zinc. 



Tin. 



Lead. 



10 minutes 



130 



13-0 



15-4 



15 



8-3 



11-0 





30 



5-4 



7-6 



134 



45 



5-3 



7-3 



12T 



r0 hours 



5-0 





11-55 



1-5 „ 



4-85 



72 



108 



2-0 „ 





7-3 



11-5 



2-5 „ 





7-3 







5-0 „ 



50 





11-8 



7-0 „ 



5-3 





11-9 



9-0 „ 







120 



12-0 „ 





7-9 







18-0 ., 



60 



8-0 



- 1 



Fig. 4. 











































p 





















k 









' n 













>v 



>-— - 





























Tin 











r 



>e — 















Zdnc 





v 





























































The values obtained for the conductivity with each of the 

 metals are given in Table II., and curves representing these 

 values are shown in no-. 4. 



