Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 172
shown in the field of view, just below the solarspectrum. The prominent lines in the sodium spectrumare just below certain dark ones in the solar spectrum.Sodium is therefore in the sun. What would the observer conclude about the nebulain Andromeda if its spectrum were continuous ? Powerful… … Fig. 89.—A Spectroscope. metallic mirror on the face of which thousands of finelines have been ruled. Sometimes 40,000 lines areruled side by side in a space an inch wide. White lightis dispersed into its different colors by being reflectedfrom the surface of the grating. There are many other…
Astronomy
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