Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 154
nd oxygen especially. 196. Chemical Constituents of the Sun. — Numerous lines of the solar spectrum can be identified as due to the pres- 1 Their darkening, however, when the light from the lime is trans-mitted through the flame, is only relative and apparent, not real. Theirbrightness is actually… … ence in the suns atmosphere of known terrestrial elementsin the state of vapor. To effect the comparison necessary forthis purpose, the spectroscope must be so arranged that the observer can confront thespectrum of sunlight withthat of the substance to betested. In order to do this,half of the slit…
Astronomy · Constellations
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