768 Mr. A. L. McAulay on an Electrical Method 



incident on the hydrogen. The values are plotted as crosses 

 on curve I. 



Absorption in path 

 of rays (between 

 source and ioniza- 

 tion chamber) given 

 in equivalent cms. 

 of air. 



13-1 

 14-4 



15-8 

 169 



Ionization 



in arbitrary 



units. 



Absorption in 

 path of rays. 



Ionization. 



•53 



93 cm 



of air. 



1 



•39 



106 





•75 



•23 



131 





•53 







14-4 





•41 





16-9 





•11 





18'2 





•08 



Table B. This table gives the result of one experiment 

 made with a later and improved form of apparatus. An 

 a-ray tube was used as source, and the ranges o£ the 



Absorption in 

 path of rays. 



8*7 cms. of air. 

 12-6 

 14-4 

 18-3 



20-1 



Curve I. 



Ionization. 



1 



•48 

 •36 

 •11 

 •02 



10 

 •8 

 •6 



\ \ 

 * \ 

 \ \ 









V \ 









\ 



\ 



\ 



\ 



V \4- 







•2 













s 



N 





D 



Absorption In ey uivstent cms of sir. 



emerging particles were from about 5 em. to zero as in the 

 experiments from which table A is derived. The values are 

 plotted as circles on curve I. 



