Wellisch — Experiments on Active Deposit of Radium. 291 



Table II. 



Emanation introduced 29 April, 1914. 

















, s 















Duration 







03 P^ 9 



6 



Date 

 1914 



Electrode 

 removed 



Accum- 

 ulation 



of 

 exposure 



Potential 

 on case 



V So 

 t+j i^ ~ 



rn-2 § S 









h. 



m. 



h. m. 

 2 5 



volts 



CO .5 j_i o3 



1 



1 May 



12.45 p. m. 





10 



-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. m. 



1 



24 



1 



-400 



5-21 





7 





12.39 





13 



1 



-400 



3-24 





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 



5-72 





11 





5.23 





i 



3 38 



+ 990 



11-40 



25 9 



12 





5.24£ 





* 



1 



+ 990 



•30 





13 



5 May 



3.15 





H 



4 29 



-990 



•51 



22-3 



14 





3.16| 





£ 



1 



-990 



•06 





15 



8 May 



10.23 a. m. 







long 



+ 990 



5-28 



12-1 



16 



9 May 



12.15 p. m. 



25 





1 



-990 



1-18 





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 





Alternating 60 cycle. 















(after 25 m 



•) 



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 



6-67 





27 





8.10 





54 



1 



+ 160 



8-77 





28 



22 May 



3.35 



18 





1 



+ 160 



6-17 





29 





4.45 



1 



9 



1 



-160 



4-42 





30 



23 May 



7.5 



25 





1 



-160 



1-15 





31 





8.00 





54 



1 



+ 160 



2-20 





32 



25 May 



7.14 



26 





1 



-160 



•19 





33 





7.48 





33 



1 



+ 160 



•52 





which the particles diffuse is well shown by the smallness of 

 the activity in the absence of any applied potential (3 and 18). 

 With a large positive potential applied to the case the inner 

 electrode, if exposed for one minute, receives practically all the 

 positively charged aggregates, plus the positively charged 

 deposit particles formed in one minute ; the former is however, 

 in the circumstances to which Table II refers, comparatively 



