360 Report of the Committee on Colour- Vision. 



the N,aval Service are required to recognise without hesitation 

 the primary colours, as well as green, the tests employed being 

 those of coloured flags or coloured cards held at varying distances 

 from the candidate. 



" Cases of hesitation, or suspected defective colour-perception, 

 are tested by Holmgren's wools and samples of coloured buntings 

 used in Her Majesty's Navy. 



"A special form of apparatus, in the shape of a lamp with 

 coloured slides, for testing colour-perception at night, is under 

 trial. 



" I am, my Lord, 



" Your obedient Servant, 

 " The Lord Rayleigh, " Evan MacGtRegor. 



" Royal Society, 



" Burlington House, W." 



" London, Brighton, and South Coast Railway, 



" Secretary and General Manager's Office, 



" London Bridge, 



" June 26th, 1890. 



" Tests for Colour Vision. 



"Sir, — Referring to your letter of the 16th instant, relative 

 to the tests used on this Railway for Colour Vision, I have the 

 pleasure to hand you herewith some small samples of the 

 different coloured glasses used for signals, and also a couple of 

 pieces of red and green bunting, which are portions of flags used 

 for hand signals by our Guards and Permanent-way men. The 

 white bunting is made of the same material. 



" The memorandum overleaf describes the pigments used for 

 signal colours, and the labels on the glasses enclosed describe 

 the colours and the uses the glasses are put to. 



"With regard to the tests employed, I may state that the 

 Company's Medical Officer examines, on their appointment to the 

 service, the men in the Traffic Department, and for this purpose 

 skeins of coloured wools are used, as well as coloured discs. 



" In the Locomotive Department the Drivers and Firemen first 

 commence as Engine Cleaners, when their eyesight is tested by 

 the Inspectors, the colours shown being red, green, and white, at 

 short distances. On being promoted to Firemen it is again tested 

 at a distance of about 420 yards with red, green, and white 

 boards, of about half the size of semaphore signals, and this test 

 is again repeated when they are promoted to Drivers. 



" In addition to this, the Foremen examine them at distances 

 varying from 400 to 700 yards, both by night and day, the 

 Surgeon of the district finally giving a certificate. 

 " I am, Sir, 



" Your obedient Servant, 



"A. SARLE, 

 "Secretary and General Manager." 



