﻿KING. 



Phil. Mag, Ser. 6, Vol. 23, PL VII. 



Fig. I. 



Curves of the functions I. y=e~ x . 



II. y=f(ai)=6-*+x FA (~x). 















































\\ 













































\ 













































\ 















































\ 













































N 



V 













































S 



\ 







































































































































































Iy 



e~* 











































Ey-.fW 



1-0 



1-5 



2-0 



Fig. II. 



Decrease of intensity of penetrating radiation with height above the earth's surface. 

 Intensity at surface is taken as unity. The various curves refer to intensities 

 due to radioactive material in layers of different thickness. 



Curve I. 



ft = .01 cm. 



Curve III. 



li—\'\ cm 



Curve II. 



Ti — 'W cm. 



Curve IV. 



h = ll cm. 



i-'n 



















































•q 



V 



















































V 



\ 















































-7 



\\ 



\ 



N 













































•6 



\ 



\ 



\ 



N 











































• s 



\ 



s 



\ 1 



s 



^ 



s 













































































































































































=^5 

















) 











































I 









































~- 









H 



1 v 



C 











5 













IC 













1 



iO 









« 



)0 



Ater 



HES 





