372 Report of the Committee on Colour- Vision. 



Appendix II. 



Board of Trade Tests. 



The following- is the Circular of the Board of Trade relating- to 

 their colour tests. The luminosities and the dominant wave 

 lengths have been shown in italics opposite the colours used, 

 which will give an idea to the Committee of the utility of the 

 colours employed, recollecting- that the neutral point in the 

 spectrum for the green colour-blind is about \5020, and for 

 the red about A,4960 : — 



" Herewith are — 



" (a.) A lanthorn having- in it a lamp in which kerosine is to 

 be burnt. 



" (b.) A slide having- ground glass in it. 



" (c.) Nine slides, each having a coloured glass in it. The 

 colours are as follow : — 



" Examination in Colours. 



Luminosity 

 in gaslight, 

 white 100. 



Dominant 

 wave 

 length. 



3. Green (Standard or No. 1) 



4. Green (Bottle or No. 2) 



5. Green* (Pale or No. 3) 



6. Yellow 



7. Neutral* 



1. Red (Standard) 



2. Pink or salmon 



44'2 

 42'5 

 10'0 

 5'7 

 20'0 

 80 '0 

 7 5 

 2'5 

 7-5 

 58-0 



6,200 



5,190 

 5,720 



8. Blue (Standard) 



9. Blue* (Pale) . . 

 Ground flues used 



4,650 



(cL) Cards, five of each, as follows 



1. White 



2. Black.. 



3. Red .. 



4. Pink* 



400 

 40 



140 

 21 



240 

 16'5 



7'5 



8'0 



6,150 

 6,630 

 5,370 

 5,770 

 4,750 

 5,620 



5. Green 



6. Drab* 



7. Blue . . 



8. Yellow 



