"^Different Types of Beta Rays. 

 Table XI. 



141 



Ionization by /3 transmitted Secondary Rays from Aluminium- 

 foil with Primary Rays deflected down into Chamber. 





Saturation Current (arbitrary scale) 



with different thicknesses 









of Aluminium- 



foil. 







Current 

 in magnet 































(amperes). 



I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 





mm. 



mm. 



mm. 



mm. 



mm. 



mm. 



mm. 





00 



0-0065 



0-28 



1-184 



341 



4-73 



8-14 



00 



77-6 



65-7 



25-7 



14-6 



13-99 



13-12 



1232 



0-2 



1173 



100-8 













45 



1769 



157-5 



36-2 











0-8 



302-6 



3194 



631 



15-7 



13-97 



1324 





1-3 



3650 



396-5 













1-65 



359-3 



396-5 



280-4 



22-2 



14-57 







2-5 



294-8 



319-4 



287-5 



50-4 



15-65 



1315 





4-5 



111-6 



127-7 



111-6 



73-2 



17 42 



1322 



12-24 



6-5 



631 



74-2 



680 



53-7 



20-31 



1342 



12-22 



10-0 



37-4 



432 



22-7 



355 





1342 



1215 



15-0 



25-1 



18-4 



27-9 



23 8 



16-64 



13-17 



12-13 



220 



18-6 



20-9 



20-1 



18-1 



15'37 



13-08 



1209 : 



Table XII. 



Ionization by ft transmitted Secondary Rays from Aluminium. 

 foil with Primary Rays deflected up from Chamber. 





Saturation Current (arbitrary scale) for diffe 



•ent thicknesses 









of Aluminium-foil. 







Current 

 in magnet 























(amperes). 



I. 



II. 



III. 



IV. V. 



VI. 



VII. 





mm. 



mm. 



mm. 



nun. mm. 



mm. 



mm. 





00 



00065 



0-28 



1-184 3-41 



473 



8-14 : 



0-0 



63- 1 



715 



259 



147 13-93 



13-12 



12-37 



0-85 



19-8 



11-2 



16 3 



13-9 13-74 



1302 



12-27 



25 



11-7 



10-3 



11-8 



13-1 13 65 



12-90 



1208 



4-5 





104 



11-3 



127 1341 



12-57 





6-o 



135 



10-2 



11-0 



12-4 1290 



12-30 



11-51 



150 



12-6 



10-1 



10-7 



120 12-72 



11-87 



11-11 



220 



123 



10-1 



10-6 



11 9 12-46 



1 



11-68 



10-S9 



in fig. 12. This increase in ionization in the chamber due to 

 the thin covering of aluminium was interpreted as being due 

 to the action of secondary radiation. The small thickness of 

 aluminium-foil used would only absorb a very small pro- 

 portion of the primary (3 rays, and consequently it would be 

 possible for the excited secondary rays to make a contribution 



