1 68 Mr. C. S. Whitehead on the Effect of a Solid 



Now da _ dH dQ "*) 



dt~ dy dz | 



_db_d?_dR I 



dt dz dx | 



_dc_dQ_dF | 



dt dx dy J 



therefore from (5) 



(«) 



-n*V*H-y.+i(*r)^^i} 



(7) 



Equations (5) and (7) hold in the sphere. 



In the dielectric, neglecting the displacement-current, 

 a, b, c may be derived from a potential ; we may therefore 

 assume 



x +a d.vr*"+ l j 



dx 



= {dn n 



I «!» + 1 !i_ 



1 rfy dy r 2n+l 



di1 n 

 dz 



}P* 



(8) 





where a= radius of the sphere, and £l n , 12/ are solid harmonics 

 of degree w, to be determined from the nature of the inducing 

 system. 



Let E s = component of the magnetic induction along the 

 radius vector in the sphere. 

 R d =the component in the dielectric. 

 T, = component of the magnetic induction tangential 

 to a curve at right angles to the radius vector 

 in the sphere. 



