﻿Magnetic Rotatory Dispersion of Paramagnetic Solutions. 913 



cuts off the spectrum completely, which occurs in the region 

 of 3000 A.U. 



The result with cobalt indicated that a systematic ex- 

 amination of the the rotation produced by paramagnetic 

 substances in the ultraviolet would be of interest, and the 

 present communication refers to the results obtained with 

 the sulphates (fig. 1), chlorides (fig. 2), and acetates (fig. 3) 

 of nickel and cobalt, also ferrous sulphate, in aqueous 

 solution*. 



Fig. 1. 



2J 









/ 



/ / 









/ / 



y * / c ° 





o 



X 



z 

 < 



< 



Of 







/, 



^ 





z 



c 

 < 



Gfc 





y ■'' > 



Xy y. 



y* 



Ol/ LPHATK 





& 



yy 



y- x 







XxioU*) 



The method employed has already been described in 

 connexion with the rotation in certain organic compounds*)". 

 The solution was contained in a short tube (1'135 cm. long) 

 placed between the poles of the electromagnet. The rotation 

 obtained for water showed that a reversal of the current 

 (7 amperes) produced a change of magnetic potential 30380 



In the accompanying graphs dispersion curves are given 



* The results for nickel and cobalt sulphates were confirmed in this 

 Laboratory in 1918 by the Rev. W. D. Ross, M.Sc. 

 t S. S. Richardson,' Phil. Mag. vol. xxxi. p. 232. 



