Abstract :
Lighting of instruments in airplanes by the use of indicator markings that fluoresce when bathed in ultraviolet radiation is one of the latest developments that adds to the convenience and safety of the crew. The light is not detectable by enemy. airmen, does not cause unwanted reflections, and does not impair night vision. Through several stages of development, a blue fluorescent mercuryvapor lamp which operates on the 24-volt d-c system of the airplane has been produced for generating the ultraviolet radiation.
