BY MEANS OF THE RADIOMICROMETER. 



15 



transmissions for the more concentrated and the more dilute solutions, 

 the slit-width being 0.2 mm. Columns 4 and 5 contain the results for 

 the two solutions, the width of the slit being 0.3 mm. Columns 6 and 

 7 give the results for the two solutions when the slit-width was 0.4 mm. 

 In all of this work about 0.8 ampere of current was used. 



TABLE 2. Results with different widths of slit. 



From the transmission values given in table 3, we can gain a fairly 

 accurate conception of the intensity of the absorption due to the water 

 contained in 2 mm. of the more concentrated solution, and in 16 mm. 

 of the more dilute solution. The water absorption was taken only for 

 those wave-lengths which correspond to the centers of the neodymium 

 absorption bands. 



Tables 2 and 3 bring out several interesting points concerning the 

 neodymium bands. The effect of increasing the slit-width is to dis- 

 place the bands towards the longer wave-lengths. 1 As we approach 



1 This is due to the slit having but one movable edge, the other being stationary. 



