...color-blindness. ' ' The following is an extract from a letter by a ' ' thirty years' railway man. " "I have been on the railway for thirty years and I...red from a green light at night in a bit of a fog." Color-blindness is hereditary. Among the Quakers, for example, the proportion of color-blind persons...

...colour-blindness, 2nd ed. 4 — " I have been on the railway for three years, and bad a mate who could not tell a red from a green light at night in a bit of fog, and "we had a pitch into another train over it." — Letter by a "Thirty-years Railway Man." Invention,...

...statement: " I have been on the railway for thirty years and I can tell you the card-tests and wool-tests are not a bit of good. Why, sir, I had a mate that...red from a green light at night in a bit of a fog." To eliminate both these classes of persons we must have a method of testing on quite different principles...

...sir, I had a mate that passed them all, but we had to pitch into another train over it He could n't tell a red from a green light at night in a bit of a fog." The best form of test is one that copies as closely as possible the signal lights in actual use under...

...tests and the wools are not a bit of good. Why, sir, I had a mate that passed them all, but we had a pitch into another train over it. He couldn't tell...red from a green light at night in a bit of a fog." A signalman came under my notice the other day who could not see a red light at all when a neutral...

...statement: "I have been on the railway for thirty years and I can tell you the card-tests and wool-tests are not a bit of good. Why, sir, I had a mate that...red from a green light at night in a bit of a fog." To eliminate both these classes of persons we must have a method of testing on quite different principles...