Vol. 6, 1920 PHYSICS: L. PAGE 121 
E= / ^ {c-v + ':^' {f X (c-v)} XC + 
^-{{cc X (c — v)} Xc) Xc|, (9) 
H = 
C'VV { c 
CO X (c — v)} X c|. (10) 
r 
The field equations (1) and (2) representing Coulomb's law and Ampere's 
law are unchanged for this more general type of field, but (5) and (6) be- 
come 
V-H = 6, (11) 
V X E = — - (H + eu), (12) 
c 
where the density of magnetic charge e is 
CO'C 
t3) 
— — WV 
; ^-T-^' (13) 
and its velocity u is in general equal to the velocity c of light. The energy 
equation for fields of this character takes the form 
-ii (E2 + m)\ 
dt\2 ) 
+ cV-(E X H) + E-vp + H-ue = 0, (14) 
and the energy radiated by a charge e due to rotation of the field is 
R = '^ 
for each revolution. In terms of the frequency v this expression has the 
form 
K = V. 
Sc 
If the value of the electronic charge is substituted for e, to wit 
e = 4.77 (lO)-ioVSr 
Heaviside-IvOrentz units, it is found that 
R = 1. 6.4(10) V erg sec. 
32 
1 ; 
= — nv, 
32 
