68 Chant — Variation of Potential along a Wire, etc. 



farther for the larger ones. I find it difficult to give the sig- 

 nificance of this. 



Other minima were found, but they were not so well- 

 defined. They are, no doubt, due to natural oscillations of the 

 wire, but they are hard to identify. 



For the wires 300 and 400 cms long the chief minima are at 

 the middle points. 



The question of the dependence of the positions of the 

 minima on the detector is interesting and important ; and that 

 there is no such connection was shown in the following way. 

 A second helix, similar to that of the detector, was soldered to 

 the free wire running up beside the one bearing the wing, 

 thus practically doubling the capacity and inductance ; but 

 there was no displacement of the minima. The period of the 

 detector must be many times that of the oscillators. 



In the near future I hope to apply the magnetic detector to 

 the exploration of much longer wires, in which case the phe- 

 nomenon of standing waves should be more distinctly shown. 



University of Toronto, Toronto, Canada. 



