... example, in analyzing the spectrum of minerals found in the water of a certain spring in Germany, two lines of unknown origin were found in the blue region of the spectrum. This bit of evidence was ... known material in the laboratory. However, during a solar eclipse in 1868, a new set of spectral lines was found in the spectrum of the light coming from the edge of the sun. This set of lines ... complicated, that is, they are composed of complex patterns of a very large number of lines; the search for a theory to explain the origins of spectral lines was concentrated on hydrogen, the...