1-0 



•2 



for the Measurement of Recoil Radiations. 



769 



Table C. This table gives the results from four experi- 

 ments made witb a brass cylinder coated with the active 

 deposit from radium as source, a rays of ranges from 7 cm. 

 maximum to about 5'8 cm. minimum were incident on the 

 hydrogen. The values are plotted in Curve II. 



Absorption 



in path 



Ioniza- 

 tion. 



Absorption 

 in path 



Ioniza- 



Absorption 

 in path 



Ioniza- 

 tion. 



of rays. 





of rays. 





of rays. 





110 



•97 



110 



1-00 



11-0 



108 



162 



104 



22-8 



•75 



149 



•98 



214 



100 



241 



•61 



162 



1-02 



25-3 



•53 



25-3 



•51 



18-9 



•95 



267 



•38 



28 



•25 



20-1 



•91 



280 



•21 











214 



•82 



292 



•06 



110 

 20-0 

 293 

 30-4 



TOO 

 •95 

 •09 

 •0 



22-8 



•81 



The dotted curves are replotted from figure 5, p. 550, of 

 the paper by Professor Rutherford above referred to (Phil. 

 Mag. June 1919). That shown with curve I. is E in fig. 5 

 of his paper, and that with curve II. is A. 



Curve II. 



o 





8 . 









g~" 



o 



^^< 















V s 













\ 



\ id 













\ x 



* X 



V 1 













\ 



\ 

 \ 

 \ 



1 



-■ \ O 



12 



16 20 24 



Absorption in equivalent cms. of air. 



28 



Summary of Results. 

 The results obtained check the main points summed up in 

 fig. 5 of the paper above referred to (Rutherford, Phil. Mag. 

 June 1919). Curve II. is almost directly comparable with 



31 



