Colour blindness and defective eyesight in the personnel of the Mercantile Marine : evidence of Mr. Bickerton (Liverpool) given before the President of the Board of Trade, Feb. 1, 1895, on the Board of Trade tests and regulations for eyesight and colour blindness.

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Colour blindness and defective eyesight in the personnel of the Mercantile Marine : evidence of Mr. Bickerton (Liverpool) given before the President of the Board of Trade, Feb. 1, 1895, on the Board of Trade tests and regulations for eyesight and colour blindness. Public Domain Mark. Source: Wellcome Collection.