Harper's new monthly magazine, 41 / 1870
Experiments lately prosecuted, as to the shades of color recognizable most easily and at the greatest distances, have resulted in provuing that bright yellow has the advantage in this respect; and that next to this comes blue. Violet, green and red are said to be less easily recognizable than any other. In the construction of signals, therefore, whether designed to be used by night or day, it would be well to bear this practical suggestion in mind.
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