94 



Professor Airy on the 



After emerging from the crystal, we must (as before) diminish x 

 in the latter expression by 9: and thus the vibration of the 

 extraordinary ray 



. 2tt 



= — c . sin — (vt— x + 9) . sin )3 . cos /3 + a + <p 



A 



2tt 



+ c . cos — (vt - x + 9) . cos j3 . sin /3 + a + <p. 



\ 



The only parts of these transmitted by the analyzing plate are 

 the resolved parts perpendicular to its plane of polarization = vi- 

 bration of ordinary ray x cos <p + that of extraordinary ray x 



sin <p 



. 27 



= c . sin — (vt— x) . sin /3 . sin /3 + a + <p . cos </J 



A 



2tt 



+ c . cos — (vt — x) . cos ■ cos /3 + a + <p . cos <f> 



\ 



2tt 



— c . sin — («£— x + 9) . sin /3 . cos + a + <£ . sin <p 



A 



+ c.cos — -(vt— x + Q) . cos /3.sin (3 + a + <p. sin 0. 

 \ 



The coefficient of sin — - (vt-x) is 



A 



2tt 



c.sin /3.sin /3 + a + </>.cos (/) — c .cos-— G.sin /3.cos /3 + a + ^).sin(tj 



2tt 



— c . sin — - 9 . cos /3 . sin /3 + a + <p . sin (/> : 



A 



the coefficient of cos — -{vt— x) is 



A 



2tt 



c . cos /3 . cos /3 + a + <p ■ cos — c . sin — - 9 . sin /3 . cos /3 + a + <p . sin 



+ C.C0S— -9. cos /3.sin fi + a + <p. sin <£. 

 A 



