288 M. G. Quincke o?i Electrolysis, and the 



A similar series of measurements were made with Thomson's 

 quadrant electrometer. 



The current of a Grove's battery of 7 elements flowed through 

 an alcoholic solution of iodide of cadmium in the glass trough 

 described above. The amalgamated cadmium electrodes were 

 connected with the pairs of quadrants of the electrometer by 

 means of thin silver wires. With different distances of the elec- 

 trodes the followins: deflections were observed : — 



Distance 



of the 

 electrodes. 



w. 



Deflections of the electrometer. 



i 



u — v. 



Mean. 



+ ^- 



— e. 



Observed. 



Calculated. 



oo 

 loo millims. 

 77 „ 



304 

 285o 



278 

 2b'o7 



-304 



-287-2 



-278 



-2662 



304 

 286-3 

 278 

 265-9 



304 

 287-8 

 273-6 

 260-5 



E, = 50 m. u.^ w (155 millims.) =900 m. u. 



The pairs of quadrants of the electrometer were further con- 

 nected with two cadmium wires cemented to a strip of glass at 

 the distance of 34-2 millims. from one another. The wires, ex- 

 cept their extreme points, were coated with paraffin. When the 

 cadmium plates, which conducted the current in and out, were 

 155 millims. from one another, then the electrometer showed 

 the following deflections : — 



"Wollaston's Electrodes. 



On the surface of the liquid . 

 In the middle of the liquid 

 Calculated 



648 



62-25 



63-19 



The difference between the observed and the calculated de- 

 flection is explained by the accidental differences of the concen- 

 tration of the alcoholic solution, just as the variations of the 

 deflections of the electrometer when Wollaston''s electrodes were 

 moved parallel to each other. 



A trough 320 millims. long, 3-6 millims. broad, 7*5 millims. 

 high was made of glass-plate fitted together with paraffin, and 

 filled with an alcoholic solution of iodide of cadmium. The 

 current of a Grove's battery of 6 elements was passed through 

 a reflecting multiplier of suitable sensitiveness and through the 

 alcoholic solution of iodide of cadmium by means of amalga- 

 mated cadmium plates, which were connected with the pairs of 

 quadrants of the electrometer by thin silver wires. The resist- 

 ance of the entire liquid was about 2000 mercury units. 



