468 

 also 



Cr 



Mr. J. Russell on the Superposition of 

 a x c v -ac = ck\\ + -£ 1. 



2Alogjfl+^) 2 ' 



— 27rmi 1 + 97 . 



15. The magnetic induction at any point of the surface is 

 therefore 



pe F 2Alog(l+^) " 



*rx(l.+ ^) 



Patna College, 

 Bengal, India. 



XLIV. T^£ Superposition of Mechanical Vibrations (Electric 

 Oscillations) upon Magnetization and conversely, in Iron, 

 Steel, and Nickel. By James Russell, F.R.S.E* 



[Plate XL] 



THAT mechanical vibrations affect magnetism has been 

 known since the time of Gilbert. About twenty years 

 ago Ewing published investigations upon the effects of 

 vibrations upon magnetization |. It is also recognized that 

 disturbances other than mechanical produce magnetic effects 

 essentially vibratory. A rise or a fall of temperature J, the 

 superposition of a transverse magnetic field, increase induc- 

 tion, decrease residual magnetization. Other examples might 

 have been given. But the disturbing element has also direct 

 magnetic effects, and sooner or later the analogy becomes 

 imperfect. 



On the other hand, it appeared reasonable to suppose that, 

 as the direct magnetizing action of high-frequency currents 

 is very greatly reduced, the vibrational effects due to the 

 high frequency would be increased, and that consequently 

 the analogy between the effects of electric oscillations and 



* Abstracted from the Trans. R. S. E. vol. xlv. p. 491 : read May 7, 

 1906 ; Addendum read Dec. 17, 1906. Communicated by the Author. 

 f Phil. Trans. 1885, p. 564. 

 %■ ' Magnetic Induction in Iron/ 3rd edition, p. 181 (Wiedeman). 



