796 Mr. J. Crosby Chapman on some 



Whence by subtraction : — 



Table II. 



Conditions of experiment. 



State of iron. 



Intensity of 

 tertiary radi- 

 ation reaching 

 horizontal 

 electroscope. 



Intensity of 

 tertiary radi- 

 ation reaching 

 vertical 



electroscope. 



Carbon radiators R x -j-R 2 . . . 

 Carbon radiators R 1 - r -R 2 ... 



unmagnetized 

 magnetized 



6-1 

 6'1 



1-5 



1-6 



Arsenic radiator at R 2 ... J 



present 



1-6 



1-6 



Whence : — 



Polarization of beam when transmitted 1 

 through unmagnetized iron J 



Polarization of beam when transmitted "1 

 through magnetized iron J 



61 

 1-5 



6a 



1-6 



= 41. 

 = 3-8 



Polarization of beam radiated from 

 arsenic plate at P* a 



1 = ~ = 



J 1-6 



10. 



Combining this result with others deduced in a similar 



manner : — 



Table III. 



Polarization of beam when 



transmitted through 



unmagnetized iron. 



Polarization of beam when 



transmitted through 



magnetized iron. 



41 

 32 



3-0 



38 

 30 

 3'2 



Mean value 34 



£3 



These results show that the ratio which determines the 

 polarization of the secondary beam does not alter when the 

 iron through which the beam is transmitted is magnetized. 

 Had there been present anything of the nature of a rotation 

 of the plane of polarization, it can be seen at once that there 



