IT is sometimes suggested with regard to aerial light beacons that when the weather is clear they are unnecessary in populous country, and when the weather is foggy the lights cannot be seen, and therefore are of little use under any conditions. This statement does not, of course, represent the true facts of the case, but it does indicate the vital importance of a study of the various questions relating to the transmission of light to great distances.
Hampton, W.M. (1930), "Light Beacons for Night Flying: Visibility and Fog Penetration of Various Types with a Comparison between Neon and Incandescent Lamps", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 3, pp. 64-65. https://doi.org/10.1108/eb029247
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