16-i HOUSTON, KENNELLY— THE PATH OF A CURRENT. [Mar. 19 



flux is supplied from the dynamo to the insulating medium between 

 the two wires. The rush of electric flux which escapes from the 

 dynamo constitutes the electric current which it supplies, and if a 

 certain imaginary unit quantity of electric flux constitutes a coulomb 

 of electricity (the practical unit of electric quantity), then the 

 number of coulombs of electric flux, uniformly supplied per second 

 from the generator, represents the number of amperes of electric 

 current supplied to the circuit. If the pressure of the generator is 

 I coo volts, then the difference of potential between the wires at A, 

 is I GOO volts, and these two wires we may first assume to be per- 



Fig.29 



A <?i{{{^v I B 



A AU i u u I i u i J^i ^ u u u i U i w i I i t J. i. I u in. i- u 4 J- ^•'4. 4- i M u u J i i-p 



^{ U U U I U n R i lU U 1 1 U mri 1 li U U I U J U U U';^ f i U U if U P' 



•^M u u u w u u j I u u u u i u^ \ I i jHw mnnnmiH mimjiyjtJfinwmnT;ti4 "* 



*^^ '' ,?uwtFii^WtwM|titaititlTttOTitintiTj^r 



A^tinuutirifHUititimiritirittTUjtuwtinwwTWMititaiti'UTitinTUitiritiTmrj.rirituwMuwntiD 





Figs. 29-33. — Movement of Electric Flux in Closed Circuit of Perfect Conduction 

 and Insulation, when Supplied by a Generator of no Resistance at One End. 



fectly conducting. The arrow v, in Fig. 29, represents the initial 

 direction of flux rush, from A towards B. As the flux moves along 

 towards B, with the velocity of light, more flux comes out of the 

 generator. The function of the generator is to supply flux to the 

 insulating medium with which it is connected by the wires. The 

 curved arrows represent the direction of the magnetic flux distribu- 

 tion which everywhere accompanies the moving electric flux. 



Fig. 30, represents what takes place by the time that the van- 

 guard of electric and magnetic fluxes has reached the end B. The 

 entire insulator between the two wires is now full of electric flux at 

 the particular density furnished by the dynamo at its pressure. 

 With perfect conduction and perfect insulation there has been no 

 loss of energy, and the magnetic flux and electric flux are just as 



