THE FIELD OF VISION FOR COLOURS 



75 



Fig. 28 shows the fields with 



red . . . . 670-5 /t/x 0-27 foot-candle 



yellow .. 589-2 „ 3-95 



green .. 508-5 „ 1-89 



blue .. .. 460-3 „ 0-36 



RIGHT. 

 



15 



30^VvvV 



,WV 



u^'^^^^t''^^^^'^^ 



6s- 

 ;{"7""/'m|Nifm,in.i< 



,<^ 120 

 ,<?^ 135 



165 



,T|r 



180 



165 



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

 (D lisht:=3-95 foot-candles at the screen). (Al)ncy.) 



