THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[FIFTH SERIES.] 



JUNE 1881. 



LV. On the Molecular Vortex Theory of Electromagnetic 

 Action. By R. T. Glazebrook, M.A., Fellow of Trinity 

 College, and Demonstrator of Experimental Physics at the 

 Cavendish Laboratory, Cambridge* '. 



IN Crelle's Journal, vol. lxxii., Helmholtz (" Ueber die 

 Bewegungsgleichungen der Electricitat ") called atten- 

 tion to the analogy between the equations of the electromag- 

 netic field in a conductor and those which give the motion of 

 a viscous fluid. The first part of the present paper is an 

 attempt to develop more completely some of the consequences 

 of that analogy. 



Let us consider a medium in which %, 7), J are the displace- 

 ments at the time t, of the particle whose initial coordinates 

 are x, y, z. Let p be the density of the medium, and coi, co 2 , co 3 

 the component angular velocities of the particle about the axes, 



d£ 

 and let jf= -~, &c. Then we have 





-Mi-i} r 





-*{£-£}• 



> ' 



, (d V dl \ 



* Communicated by the Au 

 Phil. Mag. S. 5. Vol. 11. No. 70. Jur 



thor. 



ie 1881. 



(1) 



2G 



