Electricity in a uniform plane conducting Surface, 487 



Case 5. Both electrodes touching the edge. 



r=13'43 centims., p = *163 centiin., .r = *38. 



Number of 

 experiments. 



AB. 



s. 



e. 



e 



R 



i AB 

 l0S V3-.p 



3 

 1 

 2 

 2 

 2 

 5 



24-9 



16-8 

 8-88 

 10-68 

 220 

 26-56 



12-42 



11-58 

 9985 

 10-59 

 1234 

 13-35 



•983 

 •996 

 10065 

 1-016 

 •988 

 •969 



12-25 

 11-25 

 9-54 

 10043 

 1211 

 13-40 



6-30 

 6-34 

 6-36 

 6-36 

 6-40 

 6-79 











Mean 



... 6-49 



la this case, A and B being again taken as the middle points 

 of the circular electrodes, 



L becomes 4log-^?- T ; ^— = 4C; 2C = 3*245. 



x/3V 



loi 



AB 



a/3 



53. Summary of mean values of 2C 



7Tk8 



Date 



1874. 



1875. 



Mean. 











No. of 

 experi- 

 ments. 



2C. 



No. of 

 experi- 

 ments. 



2C. 



Case 1. Both poles on 1 

 the edge J 



Case 2. One in centre 1 

 and one on the edge J 



Case 3. Both inside the 1 

 disk i 



Case 4. One in centre 1 

 and one touching the I 

 edge J 



Case 5. Both touching \ 

 the edge J 



101 



15 



9 



2-943 



3-02 



313 



14 



3 



10 



7 

 15 



2-935 



300 



3-23 



3-20 



3-245 



2-94 

 301 

 3-18 



3-20 



3-245 





It will be seen by this Table that the values of C deduced 

 from the several sets of experiments are not quite constant. In 

 explanation of the discrepancies, it is to be observed that the 

 equipotential lines determined by the contact of the electrodes 

 with the tinfoil did not agree quite strictly with equipotential 

 lines due to the arrangement of poles assumed in calculating the 

 values of L, except in the experiments (distinguished as Case 1) 



