Recent Progress in Theoretical Physics. 



243 



and other sugars, are also known to possess this property to a 

 greater or less degree. 



Here the conductor is supposed to be bent in a ring placed vertically, and the 

 plane of the paper, a section through it. The section and lines of one side 

 only are shown. These lines would therefore represent the directions of the lines 

 of flow in the fluid surrounding a vortex ring of which the small circle is a 

 section of the core. The intensity of the magnetic force at any point of one of 

 these lines would also be proportional to the velocity of the fluid at a corres- 

 ponding point around the vortex. 



Perhaps Figs. 5 and 6 

 will help to a better under 

 standing of the relations 

 contemplated. 



pireetiaiiof^lecti'i c 

 Cva'ren.t 



Direction of 

 •MkguetioFovc e, 



Fig. 5. Fig. 6 



The behaviour of two vortex rings gyrating in the same or in opposite di- 

 rections, in a frictionless fluid, are shown for rings gyrating in the same 

 direction by Nos. 1, 3, 3 and 4 of Fig. 7 ; 

 Nh.^ .-_ _ 



A A A. " A B 



Fig. 7. 

 and for rings gyrating in opposite directions by Kos. 1, 3 and 3 of Fig. 8. 



. N'o.y 





Fig. 8. 



