Name given to the method of determining the composition of a body by means of the spectrum of light which it gives forth or passes through it, founded on the principle that a substance powerfully absorbs exactly the rays it radiates, and every substance has its own absorbing powers; or it may be defined the method of distinguishing different kinds of matter by their properties in relation to light.
The Nuttall Encyclopædia: Being a Concise and Comprehensive Dictionary of General Knowledge[1] is a late 19th-century encyclopedia, edited by Rev. James Wood, first published in London in 1900 by Frederick Warne & Co Ltd.
WikipediaEditions were recorded for 1920, 1930, 1938 and 1956 and was still being sold in 1966. Editors included G. Elgie Christ and A. L. Hayden for 1930, Lawrence Hawkins Dawson for 1938 and C. M. Prior for 1956.[2]
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