﻿1064 



Intelligence and Miscellaneous Articles. 



combined hydrogen, that I thought it was worth while investi- 

 gating palladium -black, his experiments having been conducted 

 on crystalline palladium. 



It appears that, from Mr. Biggs' and my own experiments, 

 there is no evidence for the existence of a highly magnetic 

 hydrogen-palladium system, as qualitatively described by Graham, 

 nor for the existence of a magnetic " hydrogenium," whether the 

 palladium is in the crystalline or amorphous form. 



I am, Gentlemen, 



Tours faithfully, 



29 Amherst Road, 

 Withington, Manchester, 



July 20, 1922. 



A. E. Oxley. 



SHORT ELECTRIC WAVES OBTAINED BY VALVES. 



To the Editors of the Philosophical Magazine. 

 Gentlemen, — 



In the July number of the Philosophical Magazine Messrs. 

 E. W. B. Gill and J. H. Morrell have given a most interesting 

 account of experiments with thermionic valves used to maintain 

 electric oscillations of very high frequency. 



I thought it might not be without interest to mention an 

 alternative method of obtaining intense oscillations of short wave- 

 length which depends for its success on the ordinary kind of 

 electrostatic coupling in the valve. 



The experiments, carried out in 1917, were never published. 



The diagram illustrates the principle of the arrangement. A 

 is a small loop of wire, which, with the capacity of the valve,, 

 forms a closed circuit of high natural frequency. B is a tunable 

 closed circuit joining grid and filament. When B is adjusted 

 properly vigorous oscillations occur in A which were used for 

 the usual telegraphic and telephonic purposes. 



Yours faithfully, 

 The University, Leeds, R. Whiddington. 



July 31, 1922. 



