Carnegie Inst. Washington Pub. 289, Vol. Ill— Douglass 



PLATE 24 



100 



Days 



117 



no 



20 



130 



WuuMMM* 



•2WW •-' '--VJVWV* 



\20 117 



Cyclogram analysis of SS Cygni (1918) . Data cover 1896 to 1917. Directional values 

 given in days, best seen by looking along pattern at low angle. 



