80 



ROYAL SOCIETY OF CANADA 

 TABLE XIX. 



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

 Thickness of tin over the top of chamber — .0784 mms. 

 Aluminium above tin. 

 /? rays deflected towards chamber. /? rays deflected away from 



chamber. 



TABLE XX. 



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

 Radium vertically above chamber. 

 /S rays deflected towards chamber. /? rays deflected away from 



chamber. 



TABLE XXI. 



