This paper is a continuation of Bureau Research Paper RP1209 and describes the cooperative work done by the Association of American Railroads Signal Section, Corning Glass Works, and the National Bureau of Standards leading to the formulation of the AAR Signal Section specifications for signal colors and glasses. Red.-Will be of such quality that all yellow rays of light are absorbed, the spectrum being either red, or red and orange. The photometric value shall be, light 125, standard 100, dark 75. Green.-Will be of the color known as admiralty green, having a slightly bluish tint. The spectrum shall show very little yellow, being a full green with some blue. The photometric value shall be, light 125, standard 100, dark 75. Yellow.-Will give a spectrum showing a full yellow band, most of the red and slightly of the green. The photometric value shall be, Jight 120, standard 100, dark 80. Blue.-Will give a spectrum having a full blue band, with a narrow band of green. The photometric value shall be, light 125, standard 100, dark 75. Purple.-Will give a spectrum showing a considerable proportion of both red and blue. The photometric value shall be, li ght 125, standard 100, dark 75. Lunar White.-Shall show a maximum of absorption for the yellow. The photometric value shall be, light 120, standard 100, dark 80.
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