68 Mr. E. H. Barton. Electrical Interference Phenomena 



s. d. 



Brought forward 395 



Prof. W. M. Hicks, to aid him in his Experiments on the 



Higher Recalescence Point of Iron 20 



Refunded Government Grant Committee (additions to 



Royal Society's telescope) 250 



665 



" Electrical Interference Phenomena somewhat analogous to 

 Newton's Rings, but exhibited by Waves along Wires." 

 By EDWIN H. BARTON, B.Sc., late "1851 Exhibition" 

 Science Scholar. Communicated by Professor ARTHUR 

 W. RiiCKER, M.A., F.R.S. Received February 20, Read 

 April 19, Abbreviated* July, 1894. 



INTRODUCTION. 



The preliminary paper on this subjectf gave the results of a single 

 experiment, and approximately accounted for them by a mathematical 

 theory of the reflexion and interference phenomena involved. 



Since the publication of that paper the question of disturbances 

 has been investigated, the experimental conditions improved, and 

 various results obtained in confirmation of the original conclusions. 



These matters form the subject of the present communication. 



The apparatus employed for observing the interference phenomena 

 is diagrammatically represented in fig. 1 and explained in the notes 

 accompanying it. 



In Experiment VII the electrometer was placed at HH' instead of 

 EE', its usual position. In Experiments VIII and IX two electro- 

 meter needles were used, their respective attachments being at FF' 

 and HH'. 



The lengths of SAM and MD, and the special construction of the 

 abnormal part will be specified as required in the course of the paper- 

 when reference is made to the figure. 



In the former paperj it was shown that in the case of a train of 

 electrical waves advancing along the secondary from AA' towards 

 DD' fig. 1, we have the following phenomena: 



(1.) A partial reflexion at BB', the beginning of the abnormal part ; 

 (2.) A partial reflexion at CO', the end of the abnormal part ; and 

 (3.) Interferences between the two sets of waves proceeding from 

 BB' and CC' respectively. 



* The references given in the abstract of this paper (' Proceedings,' vol. 55, 

 p. 350) are to the full manuscript, preserved in the archives of the Royal Society, 

 t ' Proc. Roy. Soc.,' vol. 54, pp. 8596. 

 J Loc. cit. } p. 87. 



