Brennan, Martin Stanislaus, 1845-1927 · New York : The Catholic publication society co. · leaf 50
7 recognized.If, however, the sunlight, before entering the Spectro-scope, is first passed through the flame of a spirit-lampcolored with common salt, it will be noticed that thesetwo lines composing the I) line will appear suddenly THE SUN. … The Spectroscope. 43 more vividly black, This is due to the sodiurri lightof salt. If 110w all light but the sodium light be re-moved, the prismatic colors will uo longer appear. Wewill find two bright yellow lines in the whole spectrum,filling exactly the places held before by the two darklines of…
Astronomy
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