The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 184
theyappear in a powerful diffraction spectroscope. 163. 77;!^ Telluric Lines.—There are many lines of thesolar spectrum which vary considerably in intensity as thesun passes from the horizon to the meridian, being mostintense when the sun is nearest the horizon, and when hisrays are obliged to pass… … Fig. 181. when a candle or other artificial light is examined with aspectroscope through a long tube filled with steam. Sincethese lines are due to the absorption of our own atmos-phere, they are called telluric lines. A map of these linesis shown in Fig. 182. 164. Tlie Solar Lines. — After…
Astronomy
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