Doubly Refracting Plates and Elliptic Analyzers 

 Substituting 



Q=P 1 ^ COS 2 e o 

 >i+e\ 



5' 



(17) 



S=P 



There results : 



A/ 



1 — e 



i-j-e u 

 2e 



Y sin 2 (o, 1 — 6 o ) sin 2ir N 



i+e* 



V COS2 7Ti\ 7 



sin2(i,2)sin2 7rAA' 



1 — £" 



; — £ COS2(o, 1—6J COS2 (l,2) 



i+e> 



i+e 



j sin 2 (o, 1 — (i ) cos 2-kN 



2e 



sin 2 ttA 7 " 



sin 2(1,2 )cos 2 7r A A 



(95) 



Bravais Biplate and Brace Elliptic Halfshade. — In discussing 

 sensibility to changes of ellipticity of the incident light, no need- 

 ful generality is lost by considering the halfshade to be a bal- 

 anced halfshade (N=0) since the unbalanced portion of the 

 halfshade may, if large enough to be of importance, be consid- 

 ered as a part of the compensating system. Introducing this con- 

 dition. X=o. 



2e 



A/ 



T sin 2 ( t , 2 ) sin 2 7r AA* 



1 — £" 



— f COS 2(0,2— 6 o ) 



„2 



I+^o 



- sin 2(0, 1 — o )sin2(i,2) (r — cos27r AA) 



207 



