Taylor — Retardation of Alpha Rays oy Metals. 365 



Fig. 1. 



c 



1 



§ 



i 



i 



i 



c 



> 



- 





































■ 





X 





\\ 





V 



















N 



\ 













^ 



\ 





i 



v 













V 



'%, 





\ 













\ 



% 



> 





\ 











\ 





\ 





\ 







\ 





j 



i 



c 



t 







g 



■J 











n» 











Vj 











.\ 



s 









5 



s 



^ 



^ 





•fc 





^H 



\ 





<i 







> 



\ 



J— I 



u — 



r 



J' ' 



\ 



K££ SI £ £ 



Fig. 1. For the portion of the figure containing the curves designated as: 

 "' A Gold in Hydrogen," " Celloidin in Hydrogen," and " A Gold in Air," 

 the abscissas are the ranges in hydrogen of the alpha particles when they 

 enter the sheets and the ordinates are the hydrogen -equivalents of the 

 sheets. For the other part of the figure the abscissas are the ranges in air 

 of the alpha particles when they enter the sheets and the ordinates are the 

 air-equivalents. 



