Biff event Types of Beta Rays, 147 



Table XVII. 

 Thickness of aluminium over the top of chamber = 8*14 mms. 

 Radium on opposite side o£ chamber from its usual position. 



/3 rays deflected towards 



j3 rays deflected away from 



chamber. 



chamber. 



Current 





Current 





through 



Saturation 



through 



Saturation 



magnet 



Current. 



magnet 



Current. 



(amperes). 





(amperes). 





o-o 



1250 



00 



1256 



4-5 



12-46 



085 

 25 



12-43 



10-0 



1243 



12-32 



15-0 



12-41 



4-5 1206 



22-5 



12-40 



70 11-76 



| 100 11-43 



150 1111 



22-5 1091 



(3) A third experiment was carried out with the radium 

 and its lead protection placed back in the original position. 

 One sheet of tinfoil, '0196 mm. in thickness, was inserted 

 over the top of the ionization-chamber, and 8*14 mms. of 

 aluminium were then placed over the tin. Readings were 

 then taken of the conductivity in the chamber for the two 

 deflexions. These readings are given in Table XVIII., and 



Table XVIII. 



Thickness of aluminium over the top of chamber = 8*14 mms. 

 Thickness of tin over the top of chamber ='0196 mm. 

 Aluminium above tin. 



(S rays deflected towards 



/3 rays deflected away from 



chamber. 



chamber. 



Current 





Current 





through 



Saturation 



thi'ough 



Saturation 



magnet 



Current. 



magnet 



Current. 



(amperes). 





(amperes). 





00 



1631 



00 



16-26 



2-5 



16-29 



2-5 



16-06 



4-5 



1608 



4-5 



15-77 



65 



15-86 



6-5 



1543 



100 



15-75 



100 



15-38 



150 



15-60 



150 



14-89 



230 



15-43 



220 



14-74 



J, 2 



