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Researches in colour-blindness : with a supplement on the danger attending the present system of railway and marine coloured signals (1855)

Wilson, George, 1818-1859 · Edinburgh : Sutherland & Knox · leaf 169

An illustration from Researches in colour-blindness : with a supplement on the danger attending the present system of railway and marine coloured signals, 1855, leaf 169
g. 3. But the steersman of A has only the colour of one of B’s side-lights, to tell him, whether, as in Fig. 2, B is crossing to starboard (his right hand); or as in Fig. 3, to port (his left hand) ; and if he be the only look-out, and és colour-blind, he will be uncertain whether to port or… … green light only will be visible to each, the screens prevent- ing the red lights from being seen; and both vessels passing to starboard. Now if the pilots of A or B, one or both, are colour-blind, of what service will the colour of the one side-light be ? I reply,

Color Perception · Color Vision Defects · Accident Prevention · Accidents, Traffic

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