the Active Deposit of Radium. 



425 



which had been previously inserted. Exposures referred to 

 as " long " were for periods of over 12 hours. 



Table II. 

 Emanation introduced 29 April, 1914. 



1 



No. 



Date 

 1914. 



Electrode 

 removed. 



Accumu- 

 lation. 



Duration 



of 

 exposure. 



Potential 



on case. 



volts. 



Activity 



(after 



4h.40m.). 



Saturation 

 current 



xio 8 









h. 



m. 



b. m. 







ampere. 



1 



1 May 



12.45 p. m. 





10 



2 5 



-990 



2-72 



52-8 



2 





3.30 



2 



44 



1 



-990 



5-95 





3 





4.6 





20 



1 







•03 





4 





4.30 





23 



1 



220* 



•09 





5 



2 May 



11.00 a. m. 







long 



-400 



5-58 





6 





12.25 p. in. 



1 



24 



I 



-400 



5-21 





7 





12.39 





13 



i 



-400 



324 





8 



4 May 



9.28 a. m. 







long 



+ 160 



5-44 





9 





10.55 



1 



26 



1 



+ 160 



1-42 





10 





1.45 p. m. 



2 



49 



1 



+ 990 



572 





11 





5.23 





i 



3 38 



+ 990 



1140 



25-9 



12 





5.24* 





%_ 



1 



+990 



•30 





13 



5 May 



3.15 





ll 



4 29 



-990 



•51 



223 



14 





3.16| 





| 



1 



-990 



•06 





15 



8 May 



10.23 a. in. 







long 



+990 



5-28 



12-1 



16 



9 May 



12.15 p. in. 



25 





1 



-990 



118 





17 





2.50 



2 



34 



1 



+ 990 



1-49 



8-34 



18 





7.55 



5 





1 







•01 





19 



11 May 



11.15 a. m. 



1 



45 



1 



-990 



•67 



5-81 



20 



15 May 



10.20 



96 





1 



- 80 



•06 





21 





11.30 



1 



9 



1 



+ 80 



•10 



2-69 



22 



16 May 



10.55 



20 





1 



- 4 



•004 





23 





2.15 p. m. 



3 



19 



1 



+ 4 



•006 



















(after 25 in.) 





24 



20 May 



4.21 p. m. 



96 





1 



-160 



8-77 



•91 



25 





5.0 





38 



1 



+ 160 



9-43 





26 



21 May 



7.15 



7 



30 



1 



-160 



667 





27 





8.10 





54 



1 



+ 160 



8-77 





28 



22 May 



3.35 



18 





1 



+ 160 



617 





29 





4.45 



1 



9 



1 



-160 



4+2 





30 



23 May 



75 



25 





1 



-160 



115 





31 





8.00 





54 



1 



+ 160 



220 





32 



25 May 



7.14 



26 





1 



-160 



•19 





33 





7.48 





33 



1 



+ 160 



•52 





* Alternating 60 cycle. 



The point of chief interest in connexion with the results 

 of this table, is the large amount of deposit which goes to 

 the central electrode with negative potentials applied to 

 the case. 



The results are readily explained on the view that there 

 are present in the gas charged aggregates of active deposit. 



