62 



Chant— Variation of Potential along a 



These curves are not as smooth as the former ones, but are 

 perhaps as good as one should expect with so dead-beat an 

 oscillator. 



8 



DISTANCE FROM FREE END OF WIRE IN CMS, 



From the results with the 10 cm spheres the ratio of wave- 

 Jengthto diameter is 3*85, while with the 30 cra spheres this ratio 

 is 4-1.* The theoretical value given by J. J. Thomsonf is 3-6. 



-b urther exploration of the wire revealed no more minima. 



*It may be interesting to compare values of this ratio obtained by other 

 experimenters. Some are given in the following table, taken from a paper 

 by Hull in the Physical Review, vol. v, p. 231, 1897 : 



Diam. in mm. 

 80 

 37o 



8 



7-8 

 193 



93 



7- 



/■■ in mm. 



200 



106 



26 



18-4 



91 



43 



40 



f J. J. Thomson, 1. c, p. 370 



A/Diam. 

 2-50 

 2-83 

 3-25 

 236 

 4-71 

 4-62 

 5-18 



Experimenter. 

 Righi 



Hull 

 it 



