﻿in the Moisture condensed on Glass Surfaces. 343 



.the curve as the scale is unsuited to exhibit them ; and values 

 above H = *86 are likewise omitted, as the trend of the curve 

 there is obvious. Below H = *6 the experimental points lie 

 well on the continuation of the curve in fig. 3 when plotted 

 on a larger scale. 



Fig. 3. 

 Curve connecting Current and Hygrometric State. 









_-—*-* ""^ 



_*— - - 



I / 



H / 





I 





















20000 



30000 



No simple relation was found for this curve. It is possible, 

 however, that a knowledge of the relation between the surface 

 density of condensed moisture on glass and the hygrometric 

 state (this is now under examination) may throw light on it. 



Attempts to Optically verify Hypothesis I. 



Attempts were made in two ways to detect a movement 

 of moisture on the glass surface under the influence of the 

 current. 



The first method tried was to observe if any change occurred 

 in the polarizing angle for light due to the film of moisture 

 altering in thickness at the electrodes under the action of the 

 current. 



For this purpose the light from a sodium flame was reflected 

 at the polarizing angle from the glass of the grid. This was 

 viewed through a crossed nicol. If any motion of the water 



