224 



Mr. A. Tribe on the Distribution of 



[May 3, 



It is apparent from the numbers that there is a considerable accumu- 

 lation of the positive radical (and hence it may be concluded of negative 

 electricity) at the extremity of the strip in proximity to the positive elec- 

 trode, and that this gradually diminishes until, at a distance of 22 millims. 

 from the end, it becomes too small for estimation. The relatively small 

 number in the first line of experiment 2 shows the influence of the end 

 surface. 



The subjoined Table exhibits the results, showing the distribution upon 

 a diamond-shaped strip (1 decimetre in its longer and 1 centimetre in its 

 shorter diagonal) placed lengthwise under similar conditions : — 



Lengths of 2 millims. 

 counting from positive 

 electrode. 



Cubic centimetres of KCy used. 



3. 



3a. 



1. 



2-6 



31 



2. 



20 



H 



3. 



14 



1-8 



4. 



1-6 



1-7 



5. 



21 



1-8 



6. 



1-9 



21 



7. 



2-0 



1-4 



8. 



17 



1-6 



9. 



1-3 



1-3 



10. 



10 



1-2 



11. 



10 



0-5 



12. 



0-4 



o-o 



It is worthy of notice that the positive radical is detectable at a some- 

 what greater distance from the point of the rhombus than from the end 

 of the rectangular strips. 



The area of the first 2 millims. of the rhombus equals 04 square 

 millim. Calculating the copper on the first 2 millims. of the rectangular 

 strip for an equal area, the accumulation on these areas is shown to be 

 greater on the rhombus in the ratio of 20 to 1. This illustrates to a con- 

 siderable extent the power of the more pointed conductor in storing up 

 the radical. 



Distribution of tlie Negative Radical on the end of tlie conductor facing the 



Negative Electrode. 



For this a cylinder of pure copper, 1 decimetre long and 1 centimetre 

 in diameter, was placed lengthwise in the trough containing a 5-per-cent. 

 solution of copper sulphate, its position being similar to that of the silver 

 strip in the previous experiments. The end of the cylinder, which was 

 so placed as to be eaten away in the experiment, was made up of sections 



