Coloured lights perform an important service[1]. The main light is designed to do distant work, but it is the practice at many places to throw from the lighthouse a subsidiary light of a special character, intended more particularly to mark any rocks or shoals in the immediate neighbourhood[1].
On seeing this special light, sailors know that they are in danger, and by its bearing are assisted in shaping a course of safety[1]. The portions of the main light appropriated are generally given a special character by means of colour, and are called sectors[1]. Red is the colour mostly employed[1].
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