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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 35, Iss. 12 — Dec. 1, 1945
  • pp: 772–795

Optics InfoBase > JOSA > Volume 35 > Issue 12 > Specification of Railroad Signal Colors and Glasses

Specification of Railroad Signal Colors and Glasses

KASSON S. GIBSON, GERALDINE WALKER HAUPT, and HARRY J. KEEGAN  »View Author Affiliations


JOSA, Vol. 35, Issue 12, pp. 772-795 (1945)
http://dx.doi.org/10.1364/JOSA.35.000772


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Abstract

This paper is a continuation of 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. The previous paper defined the luminous transmission scale used by the signal engineers and glass manufacturers. The present paper describes the glasses selected by these engineers to define the limits of acceptable chromaticities afforded by these glasses when combined with kerosene or electric illuminant. The spectral transmissions of the glasses are given, together with the luminous transmissions and chromaticities for the specified illuminants. The photometric and colorimetric parts of the AAR Signal Section three-part specifications are illustrated, and the reasons given for the choice of. tolerances both on the acceptable signal colors and on the glasses certified by the National Bureau of Standards as duplicates of the standard limit glasses. Various other data of interest are given, including the expression of the permissible chromaticities of signal colors in a uniform-chromaticity-scale coordinate system.

Citation
KASSON S. GIBSON, GERALDINE WALKER HAUPT, and HARRY J. KEEGAN, "Specification of Railroad Signal Colors and Glasses," J. Opt. Soc. Am. 35, 772-795 (1945)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-35-12-772

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