of Electrons, and the Spectrum of Canal Rays. 669 



with respect to dco is absent j averaging for t they give 



- GiS/ l + U/C \' ,**,«* n 



Sl= IvU^u7c)- (i +P ' ) '"-- 



- CdS 



■iTTp 



(>-$■*■ 



+pv. 



(19) 

 (20) 



These two radiations are polarized. 



In the diagram of the unit sphere centre 0, A is the 

 pole of the axis (a, b, c), P of the axis of x, which is 

 the radius vector for the case of S 1? Q of the radius vector 



( — ~-, k cos 12, k sin II) of the case of S 2 . We shall write 



a=cosa, 6=sinacos^, c- = sinasin^, 



U 

 — — = cos 7, k = sm 7. 



Then AP = «, PQ = 7 , yPA=x, #PQ = I2. 

 Also AQ = 0, PAQ = <£. 

 Write AQP = ^. 



At P, the direction of T' is along the tangent to AP, and 

 P' is perpendicular to it. 



At Q, T' is along the tangent to AQ, P' perpendicular to it. 

 At P, the excess of the radiation vibrating in the plane of 

 motion, i. e. along AP, above that in the perpendicular plnne, 

 is given by 



- CdS/l +U/C x' T , a ? , 

 Sl_ iVl,l-U/GJ- U *> • • 



At Q, the excess of the radiation vibrating in the plane of 

 motion, i. e. QP, above that in the perpendicular plane, is 

 given by 



S/=^(l-^ 2 y.(T /2 -F> /2 cos2^. . . (22) 



(21) 



