THE FIELD OF VISION FOR COLOURS 



77 



Fig. 30 shows the fields with complementary colours 



red . . . . 650-0 /x/x 



green.. .. 500-2 ,, 



yellow-green.. 56L4 ,, 



blue .. .. 460-3 ., 



90— 



105 



Fig. 30. The fields of vision for complementary spectral colours. The relative luminosities 

 of the red and green were 225 and 270 ; those of the yellow-green and blue 96-5 and 

 21-5. (Abney.) 



