( 115 ) 
Suppose that the drawn-out tube of the capillary electrometer, 
see fig. 1, is connected with two vertical tubes, a and 5, filled with 
mercury and widened at the upper end. By means of the stop-cocks 
a and /? the communication of a and 5 with the capillary tube 
can be stopped. 
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Fig. 1. 
The poles of the capillary electrometer are connected by the con- 
ductor G. W is a resistance box, CZ a cell and P a Pout’s mer- 
cury key insulating at the beginning the cell from the capillary 
electrometer, so that at £ there is no P. D. 
We think at the beginning stop-cock @ opened, £ closed: 1st po- 
sition of stop-cocks. Let the meniscus have its equilibrium position 
at the height m,. Suddenly the position of the stop-cocks is inter- 
changed; 24 position of the stop-cocks. The meniscus will move, at 
first fast, then slower and will at last attain the equilibrium position 
ma. If now the stop-cocks are placed again in their first position, 
then the meniscus will return also to its initial level my. 
