[pound] absorption OF THE DIFFERENT TYPES OF BETA RAYS 79 



TABLE XVII 



Thickness of aluminium over the top of chamber — 8.14 mms. 

 Radium on opposite of chamber from its usual position. 

 /? rays deflected towards chamber, fi rays deflected away from 



chamber 



TABLE XVIII. 



Thickness of aluminium over the top of chamber — 8.14 mms. 

 Thickness of tin over the top of chamber — .0196 mms. 

 Aluminium above tin. 

 ft rays deflected towards chamber. ft rays deflected away from 



chamber. 



