Methods of predicting the visibility of steady-burning white signal lights are presented. First, the visual thresholds for point-source objects are discussed; then the degradation of the light signal by the atmosphere is examined. The design of the nomogram is explained and the signal-light nomogram is presented. The use of the nomogram is outlined for signal lights viewed horizontally against the horizon, sky and against other backgrounds, and examples are given. Methods for utilizing the nomogram for inclined paths of sight, upward or downward, are also presented. Finally, procedures are given for predicting the visibility of signal lights through binoculars.

  • Corporate Authors:

    American Institute of Physics

    One Physics Ellipse
    College Park, MD  United States  20740-3843
  • Authors:
    • Gordon, J I
    • Edgerton, C F
    • Duntley, S Q
  • Publication Date: 1975-2

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00083160
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 8 1975 12:00AM