THE FIELD OF VISION FOR COLOURS 



75 



Fig. 28 shows the fields with 



red 

 vellow 



/ 



green 

 blue 



G70-5 /t/u 0'27 foot-candle 

 589-2 3'95 

 508'5 1'89 



460-3 0-36 



60 



90^--- 



105 



180 



Fig. 28. The fields of vision for spectral colours with moderate illumination 

 (D light 3-95 foot-candles at the screen). (Almey.) 



