﻿Damping Coefficients of Electric Circuits. 373 



This gives for H y (X = 4'34 x 10~ 5 ) and the value of F 

 used by Takamine and Kokubu *, namely, 



F = 4-33 x 10 2 c.g.s. e.s. units [ = l'3x 10 5 volt x cm.- 1 ], 

 AX, = *36A or *43A respectively. 



The experimental value observed by Takamine and Kokubu 

 is about 1A, which is larger than that predicted by the 

 Quantum theory. It is, however, possible that part of 

 the experimental shift is due to a Doppler effect, and in 

 any case the experiments could hardly be considered accurate 

 enough to exclude o a possible experimental error of what is 

 only about ^ an Angstrom unit. On the other hand, the 

 photographs of the shift [plate ii. fig. 1] point decidedly to a 

 (general displacement of all the components in the direction pre- 

 dicted by the theory, namely towards the red, and may be 

 taken as corroborative of at least this qualitative aspect of it. 

 It is seen from (i.) and (ii.) that this lack of symmetry in a 

 strong field would be expected on theoretical grounds to be 

 more pronounced for the higher members of the Balmer 

 Series {e.g. H$ or H 6 ), and it would be highly desirable to 

 obtain measurements relating to these lines as a further test 

 for the quantitative aspect of the theory. 



In conclusion I wish to thank Mr. W. E. Curtis for 



drawing my attention to the experimental results already 



referred to. 



T ^. , nil T q Yours faithfully, 



Kings College, London, J ' 



May 12th, 1922. A. M. MOSHARRAFA. 



XXXIII. On the Damping Coefficients of the Oscillations 

 in Three- Coupled Electric Circuits. By E. Takagishi, 

 Electro -technical Laboratory, Department of Communica- 

 tions, Tokyo, Japan f. 



THOUGH the importance of the problem of three-coupled 

 electric circuits has arisen with reference to radio- 

 telegraphy, it does not seem to have been attacked with any 

 great amount of attention except by B. Macku, E. Bellini, 

 and very recently L. C.Jackson \. The valuable paper of 

 the latter made me feel very much interested, especially as 

 it will make an important contribution to radio fields, but 



* I. c. 



f Communicated bv the Author. 



X Phil. Mag. vol. xlii. No. 247, July 1921, p. 35. 



