Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 307
dark lines, which are made by ab- 26 302 ASTRONOMY. sorption of the planets atmosphere. The spectrum ofthe moon shows none of these dark lines, but is simplya fainter solar spectrum, because the moon probablyhas no atmosphere, and does not give out or affectin any way the sunlight which it… … Fig. 84.—Portion of a Spectroscope. 254. Spectroscopes.—Fig. 84 shows the theory of thespectroscope. The light from the source comes inthrough one of the tubes after passing through a slit.It then passes through one or more prisms,—six in thefigure,—each one farther separating the rays from…
Astronomy
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