FLUORESCENT • DICTIONARY ONE.COM • Definition of Fluorescent

... at the Riffel, and at 14,000 feet, I have found that it is possible to see far into the ultra-violet, and to distinguish and measure lines in the sun's spectrum which can ordinarily only be seen by the aid of a fluorescent eye piece or by means of photography. Circumstantial evidence tends to show that the burning of the skin, which always takes place in these high altitudes in sunlight, is due to the great increase in the ultra-violet rays. It may be remarked ...

— Scientific American Supplement, No. 595, May 28, 1887 • Various