The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 180
por, and is then examined witha spectroscope, the spectrum will be found to be a brightspectrum crossed by a single dark line in the position ofthe yellow line of the sodium vapor. The spectrum ofsodium vapor is reversed, its bright lines becoming darkand its dark spaces bright. With a spectroscope… … 162 ASTRONOMY. It is found to be generally true, that the spectrum of thelight from an incandescent solid or liquid which has passedthrough a luminous vapor on its way to the spectroscopeis made up of a bright ground crossed by dark lines; there being a dark line for every bright line that the…
Astronomy
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