Report of the Committee on Colour- Vision. 



361 



London and North Western Railway, 



" Secretary's Office, Euston Station, 



" London, N.W., 

 "Jume 27th, 1890. 



" Sir,— I beg to acknowledge the receipt of your letter of the 

 16th current, and in reply to your enquiry am instructed to inform 

 you that the Company purchase the coloured glasses used for 

 signal lamps from — 



Messrs. Chance Brothers & Co., Glass Works, Birmingham. 

 „ Defries & Sons, 147, Houndsditch, E.C. 

 „ Gammon & Co., Belmont Glass Works, Birmingham. 

 And that they obtain the material for signal flags from Messrs. 

 W. Bancroft & Sons, Halifax. 



" Sm, — In response to your letter of the 16th inst., I may 

 advise you that we have no appointed examiner to test the Colour 

 Vision of our men, nor do we adopt the principle of colour 

 glasses 



" Our test is that known as the wool test, adopted by several 

 of the Railway Companies, and it is made either by our Loco- 

 motive Superintendent personally, or by his immediate repre- 

 sentative. 



" In compliance with your request, I have pleasure in sending 

 the following samples : — 



" 1 red flag. 

 u 1 green flag. 



" 1 piece each of red and green glass. 



" 1 small bottle containing vermilion enamel, with which we 



Metropolitan Railway, 



" Greneral Manager's Office, 



" 32, Westbourne Terrace, London, W., 



" June 28th, 1890. 



"Colour Vision. 



paint the Signal Arms. 



" I am, Sir, 



" Your obedient Servant. 



J. BELL. 



Captain Abney, R.E., C.B." 



2 b2 



