Abstract
SPECTRUM analysis, then, teaches us this great fact, that solids and liquids give out continuous spectra, and that vapours and gases give out discontinuous spectra; that is to say, that we get bright lines in different parts of the spectrum, instead of having an unbroken light all over the spectrum. I might vary this statement by stating broadly that the radiation or giving out of light by solids and liquids is a general one, and that the radiation or giving out of light by gases and vapours, instead of being general, is in the main a selective one.
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LOCKYER, J. On the Spectroscope and Its Applications . Nature 7, 345–348 (1873). https://doi.org/10.1038/007345a0
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DOI: https://doi.org/10.1038/007345a0