A nomogram is presented for predicting the sighting range for white, steady-burning signal lights. The theoretical and experimental bases are explained and instructions are provided for its use for a variety of practical problems concerning the visibility of signal lights. The nomogram is appropriate for slant path as well as horizontal sightings, and the gain of range achieved by utilizing binoculars can be predicted by use of it.
© 1975 Optical Society of America
Jacqueline I. Gordon, Catharine F. Edgerton, and Seibert Q. Duntley, "Signal-light nomogram," J. Opt. Soc. Am. 65, 111-118 (1975)