THE FIELD OF VISION FOR COLOURS 



77 



Fig. 30 shows the fields with complementary colours 

 red . . . . 650'0 /x/z 

 green.. .. 500'2 ,, 

 yellow-green.. 561/4 ,, 

 blue 460-3 



60 



30 



^-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 9(5-5 and 

 21-5. (Abney.) 



